feat(tasks): native task tracking — aggregate, agent tools, context bundle

Adds task tracking as a first-class event-sourced aggregate (ADR-0012). The
event log stays the only source of truth; the board is a projection, and all of
a project's task events live in one stream (tasks:<projectId>).

core:
- new core:tasks module mirroring core:sessions: TaskStatus/State/Reducer/
  BoardProjector/CounterProjection/Repository + TaskService write path that
  appends events via the existing EventStore (no new storage)
- task events in core:events (sealed marker TaskEvent), registered in
  Serialization.kt; status is derived by the reducer from lifecycle facts
- work-graph edges: TaskLinkType + typed TaskTargetKind on the link, so bundle
  resolution dispatches on the recorded kind instead of guessing from the id
- delete is a soft tombstone (TaskDeletedEvent); cancel stays a visible outcome

surfaces:
- agent tools (Tier T2 mutators, T1 read): task_create / task_update /
  task_delete / task_context, registered in both the main and per-workspace
  tool registries
- REST GET /tasks/{id}/context for external agents

context bundle (TaskContextAssembler):
- task fields + acceptance criteria + relevant files + resolved dependency
  tasks (live status) + raw related links + notes, with a compact render()
- semantic enrichment via a TaskKnowledgeRetriever port bridged to the existing
  L3 retriever (late-bound holder for composition-root ordering)
- ADR/doc resolution via a TaskDocumentResolver port + filesystem adapter
  (docs/decisions/adr-*.md, padding-agnostic; *.md paths)

Unit-verified across core:tasks / infrastructure:tools / apps:server; full
gradlew check green. Not yet live-QA'd end-to-end against a running server.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/server/build.gradle

@@ -20,6 +20,7 @@ dependencies {
     implementation project(':core:events')
     implementation project(':core:approvals')
     implementation project(':core:sessions')
+    implementation project(':core:tasks')
     implementation project(':core:kernel')
     implementation project(':core:journal')
     implementation project(':core:inference')

apps/server/src/main/kotlin/com/correx/apps/server/Application.kt

@@ -3,6 +3,7 @@ package com.correx.apps.server
 import com.correx.apps.server.health.HealthInspectionService
 import com.correx.apps.server.routes.providerRoutes
 import com.correx.apps.server.routes.sessionRoutes
+import com.correx.apps.server.routes.taskRoutes
 import com.correx.apps.server.routes.workflowRoutes
 import com.correx.apps.server.ws.GlobalStreamHandler
 import io.ktor.http.HttpStatusCode
@@ -57,5 +58,6 @@ fun Application.configureServer(module: ServerModule) {
         sessionRoutes(module)
         workflowRoutes(module)
         providerRoutes(module)
+        taskRoutes(module)
     }
 }

apps/server/src/main/kotlin/com/correx/apps/server/Main.kt

@@ -47,6 +47,7 @@ import com.correx.core.sessions.DefaultSessionReducer
 import com.correx.core.sessions.DefaultSessionRepository
 import com.correx.core.sessions.SessionProjector
 import com.correx.core.sessions.projections.replay.DefaultEventReplayer
+import com.correx.core.tasks.TaskService
 import com.correx.core.tools.registry.ToolRegistry
 import com.correx.core.transitions.resolution.DefaultTransitionResolver
 import com.correx.core.validation.artifact.ArtifactPayloadValidator
@@ -80,6 +81,7 @@ import com.correx.infrastructure.inference.commons.UnavailableProbe
 import com.correx.core.inference.InferenceProvider
 import com.correx.infrastructure.inference.llama.cpp.LlamaCppInferenceProvider
 import com.correx.infrastructure.tools.DispatchingToolExecutor
+import com.correx.infrastructure.tools.task.TaskTools
 import com.correx.infrastructure.tools.FileEditConfig
 import com.correx.infrastructure.tools.FileReadConfig
 import com.correx.infrastructure.tools.FileWriteConfig
@@ -211,6 +213,16 @@ fun main() {
             null
         },
     )
+    // Agents create/update/delete tasks through the tool system (tier-gated like any tool);
+    // the service appends to the same event log. Project is derived from the task id prefix.
+    // The knowledge retriever is late-bound: the L3 retriever isn't built until later in this
+    // composition root, so the holder is captured now and its delegate set once L3 exists (below).
+    val taskKnowledgeRetriever = com.correx.apps.server.memory.DeferredTaskKnowledgeRetriever()
+    // Inlines linked ADRs/docs into the context bundle. The repo root is known here, so unlike the
+    // L3 retriever this needs no late binding.
+    val taskDocumentResolver = com.correx.apps.server.tasks.FileTaskDocumentResolver(workspaceRoot)
+    val taskService = TaskService(eventStore)
+    val taskTools = TaskTools.forService(taskService, taskKnowledgeRetriever, taskDocumentResolver)
     val toolRegistry = InfrastructureModule.createToolRegistry(
         buildToolConfig(
             workspaceRoot,
@@ -219,6 +231,7 @@ fun main() {
             toolsConfig,
             researchToolConfig,
         ),
+        extraTools = taskTools,
     )
     val toolExecutor = InfrastructureModule.createToolExecutor(
         registry = toolRegistry,
@@ -246,6 +259,7 @@ fun main() {
     val wsToolRegistryProvider = WorkspaceToolRegistryProvider { workspace ->
         val wsRegistry = InfrastructureModule.createToolRegistry(
             buildToolConfigForWorkspace(workspace, shellAllowedExecutables, toolsConfig, researchToolConfig),
+            extraTools = taskTools,
         )
         val wsExecutor = DispatchingToolExecutor(wsRegistry)
         WorkspaceTools(registry = wsRegistry, executor = wsExecutor)
@@ -311,6 +325,10 @@ fun main() {
         } else {
             null
         }
+    // L3 retriever now exists — bind it into the task context bundle's knowledge port so the
+    // task_context tool and GET /tasks/{id}/context return semantically-relevant snippets.
+    taskKnowledgeRetriever.delegate =
+        repoKnowledgeRetriever?.let { com.correx.apps.server.memory.RepoKnowledgeTaskRetriever(it) }
     val orchestrator = DefaultSessionOrchestrator(
         repositories = repositories,
         engines = engines,
@@ -501,6 +519,8 @@ fun main() {
         operatorProfile = operatorProfile,
         profileAdaptationService = profileAdaptationService,
         healthMonitor = healthMonitor,
+        taskKnowledgeRetriever = taskKnowledgeRetriever,
+        taskDocumentResolver = taskDocumentResolver,
     )
     // Wire live config editing: persist to TOML, swap the holder, and rebuild config-derived
     // services. Built after the module so the rebuild hook can swap them in place.

apps/server/src/main/kotlin/com/correx/apps/server/ServerModule.kt

@@ -115,6 +115,10 @@ class ServerModule(
     // Continuous health watch (observability-spec §4). Null disables it (tests / health.enabled=false);
     // records degraded/restored edge events on the system session, started in [start].
     private val healthMonitor: com.correx.apps.server.health.HealthMonitor? = null,
+    // Semantic enrichment for the task context bundle (GET /tasks/{id}/context). Null disables it.
+    val taskKnowledgeRetriever: com.correx.core.tasks.TaskKnowledgeRetriever? = null,
+    // Resolves linked ADRs/docs inline in the task context bundle. Null leaves them as raw links.
+    val taskDocumentResolver: com.correx.core.tasks.TaskDocumentResolver? = null,
 ) {
     val approvalCoordinator: ApprovalCoordinator = approvalCoordinator ?: ApprovalCoordinator(
         orchestrator = orchestrator,

apps/server/src/main/kotlin/com/correx/apps/server/memory/DeferredTaskKnowledgeRetriever.kt

@@ -0,0 +1,18 @@
+package com.correx.apps.server.memory
+
+import com.correx.core.tasks.KnowledgeHit
+import com.correx.core.tasks.TaskKnowledgeRetriever
+
+/**
+ * Late-bound holder for the task knowledge retriever. The task tools are built at tool-registry
+ * construction time, which is before the L3 retriever exists in the composition root; this holder
+ * is created early, captured by the tools and the route, and has its [delegate] set once the L3
+ * retriever is available. Until then (or when L3 is disabled) it returns no hits.
+ */
+class DeferredTaskKnowledgeRetriever : TaskKnowledgeRetriever {
+    @Volatile
+    var delegate: TaskKnowledgeRetriever? = null
+
+    override suspend fun retrieve(query: String, limit: Int): List<KnowledgeHit> =
+        delegate?.retrieve(query, limit) ?: emptyList()
+}

apps/server/src/main/kotlin/com/correx/apps/server/memory/RepoKnowledgeTaskRetriever.kt

@@ -0,0 +1,19 @@
+package com.correx.apps.server.memory
+
+import com.correx.apps.server.health.SYSTEM_SESSION
+import com.correx.core.kernel.orchestration.RepoKnowledgeRetriever
+import com.correx.core.tasks.KnowledgeHit
+import com.correx.core.tasks.TaskKnowledgeRetriever
+
+/**
+ * Bridges the task context bundle's [TaskKnowledgeRetriever] port to the existing L3 vector
+ * retriever ([RepoKnowledgeRetriever], typically [L3RepoKnowledgeRetriever]). Tasks are not
+ * session-scoped for retrieval, so the system session is used (the L3 repo retriever ignores it).
+ */
+class RepoKnowledgeTaskRetriever(
+    private val delegate: RepoKnowledgeRetriever,
+) : TaskKnowledgeRetriever {
+    override suspend fun retrieve(query: String, limit: Int): List<KnowledgeHit> =
+        delegate.retrieve(SYSTEM_SESSION, query, limit)
+            .map { KnowledgeHit(source = it.path, text = it.text, score = it.score.toDouble()) }
+}

apps/server/src/main/kotlin/com/correx/apps/server/routes/TaskRoutes.kt

@@ -0,0 +1,33 @@
+package com.correx.apps.server.routes
+
+import com.correx.apps.server.ServerModule
+import com.correx.core.tasks.TaskContextAssembler
+import com.correx.core.tasks.TaskService
+import com.correx.core.utils.TypeId
+import io.ktor.http.HttpStatusCode
+import io.ktor.server.response.respond
+import io.ktor.server.routing.Route
+import io.ktor.server.routing.get
+import io.ktor.server.routing.route
+
+/**
+ * Read surface for tasks. Exposes the agent context bundle (`GET /tasks/{id}/context`) for
+ * external agents (Claude Code / aider / codex). In-process roles use the `task_context` tool,
+ * which shares the same [TaskContextAssembler]. Both read from the event log; nothing is stored.
+ */
+fun Route.taskRoutes(module: ServerModule) {
+    val assembler = TaskContextAssembler(
+        TaskService(module.eventStore),
+        module.taskKnowledgeRetriever,
+        module.taskDocumentResolver,
+    )
+    route("/tasks/{id}") {
+        get("/context") {
+            val id = call.parameters["id"]
+                ?: return@get call.respond(HttpStatusCode.BadRequest, "Missing task id")
+            val bundle = assembler.assemble(TypeId(id))
+                ?: return@get call.respond(HttpStatusCode.NotFound, "Task not found")
+            call.respond(bundle)
+        }
+    }
+}

apps/server/src/main/kotlin/com/correx/apps/server/tasks/FileTaskDocumentResolver.kt

@@ -0,0 +1,91 @@
+package com.correx.apps.server.tasks
+
+import com.correx.core.tasks.ResolvedDocument
+import com.correx.core.tasks.TaskDocumentResolver
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import java.nio.file.Files
+import java.nio.file.Path
+import kotlin.io.path.exists
+import kotlin.io.path.isDirectory
+import kotlin.io.path.isRegularFile
+import kotlin.io.path.name
+import kotlin.io.path.readText
+
+private const val EXCERPT_MAX = 280
+private val ADR_ID = Regex("(?i)^adr[-_ ]?0*(\\d+)$")
+private val ADR_FILE = Regex("^adr-0*(\\d+)")
+private val FRONTMATTER_NAME = Regex("(?m)^name:\\s*\"?(.+?)\"?\\s*$")
+private val FRONTMATTER_DESC = Regex("(?m)^description:\\s*\"?(.+?)\"?\\s*$")
+
+/**
+ * Resolves link targets to repo documents for the task context bundle:
+ *  - ADR ids ("adr-7", "ADR-0007", "adr 12") → `docs/decisions/adr-<n>-*.md` (matched by number,
+ *    padding-agnostic);
+ *  - explicit "*.md" paths under the repo root.
+ * Title is the frontmatter `name:` or first `# ` heading; excerpt is the frontmatter
+ * `description:` or the first prose paragraph, capped. Returns null for anything else.
+ */
+class FileTaskDocumentResolver(
+    private val repoRoot: Path,
+    private val decisionsDir: Path = repoRoot.resolve("docs/decisions"),
+) : TaskDocumentResolver {
+
+    override suspend fun resolve(targetId: String): ResolvedDocument? = withContext(Dispatchers.IO) {
+        resolveAdr(targetId.trim()) ?: resolveMarkdownPath(targetId.trim())
+    }
+
+    private fun resolveAdr(targetId: String): ResolvedDocument? {
+        val num = ADR_ID.matchEntire(targetId)?.groupValues?.get(1)?.toIntOrNull() ?: return null
+        if (!decisionsDir.isDirectory()) return null
+        val file = Files.list(decisionsDir).use { stream ->
+            stream.filter { it.isRegularFile() && it.name.endsWith(".md") }
+                .filter { adrNumber(it.name) == num }
+                .findFirst()
+                .orElse(null)
+        } ?: return null
+        return readDocument(file)
+    }
+
+    private fun resolveMarkdownPath(targetId: String): ResolvedDocument? {
+        if (!targetId.endsWith(".md")) return null
+        val candidate = repoRoot.resolve(targetId).normalize()
+        if (!candidate.startsWith(repoRoot) || !candidate.exists() || !candidate.isRegularFile()) return null
+        return readDocument(candidate)
+    }
+
+    private fun adrNumber(fileName: String): Int? =
+        ADR_FILE.find(fileName.lowercase())?.groupValues?.get(1)?.toIntOrNull()
+
+    private fun readDocument(file: Path): ResolvedDocument {
+        val text = runCatching { file.readText() }.getOrDefault("")
+        return ResolvedDocument(
+            title = extractTitle(text) ?: file.name,
+            path = repoRoot.relativize(file).toString(),
+            excerpt = extractExcerpt(text),
+        )
+    }
+
+    private fun extractTitle(text: String): String? {
+        FRONTMATTER_NAME.find(text)?.groupValues?.get(1)?.trim()?.takeIf { it.isNotBlank() }?.let { return it }
+        return text.lineSequence().firstOrNull { it.startsWith("# ") }?.removePrefix("# ")?.trim()
+    }
+
+    private fun extractExcerpt(text: String): String {
+        val desc = FRONTMATTER_DESC.find(text)?.groupValues?.get(1)?.trim()
+        return (desc ?: firstParagraph(text)).take(EXCERPT_MAX).trim()
+    }
+
+    private fun firstParagraph(text: String): String =
+        stripFrontmatter(text).lineSequence()
+            .map { it.trim() }
+            .firstOrNull { it.isNotEmpty() && !it.startsWith("#") && !it.startsWith("---") }
+            ?: ""
+
+    private fun stripFrontmatter(text: String): String {
+        if (!text.startsWith("---")) return text
+        val lines = text.lines()
+        val closeIdx = lines.drop(1).indexOfFirst { it.trim() == "---" }
+        return if (closeIdx >= 0) lines.drop(closeIdx + 2).joinToString("\n") else text
+    }
+}

apps/server/src/test/kotlin/com/correx/apps/server/tasks/FileTaskDocumentResolverTest.kt

@@ -0,0 +1,72 @@
+package com.correx.apps.server.tasks
+
+import kotlinx.coroutines.runBlocking
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertNull
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.io.TempDir
+import java.nio.file.Path
+import kotlin.io.path.createDirectories
+import kotlin.io.path.writeText
+
+class FileTaskDocumentResolverTest {
+
+    @TempDir
+    lateinit var repo: Path
+
+    private fun writeAdr() {
+        val dir = repo.resolve("docs/decisions").also { it.createDirectories() }
+        dir.resolve("adr-0007-redis.md").writeText(
+            """
+            ---
+            name: "ADR 7 Redis Sessions"
+            description: "use redis for session storage"
+            ---
+
+            # ADR 7: use redis for session storage
+
+            **status:** accepted
+
+            ## decision
+            Redis backs session storage.
+            """.trimIndent(),
+        )
+    }
+
+    @Test
+    fun `resolves an ADR id padding-agnostically`() = runBlocking {
+        writeAdr()
+        val resolver = FileTaskDocumentResolver(repo)
+
+        val byShort = resolver.resolve("adr-7")
+        val byPadded = resolver.resolve("ADR-0007")
+
+        assertEquals("ADR 7 Redis Sessions", byShort?.title)
+        assertEquals("use redis for session storage", byShort?.excerpt)
+        assertEquals("docs/decisions/adr-0007-redis.md", byShort?.path)
+        assertEquals(byShort, byPadded)
+    }
+
+    @Test
+    fun `unknown ADR resolves to null`() = runBlocking {
+        writeAdr()
+        assertNull(FileTaskDocumentResolver(repo).resolve("adr-999"))
+    }
+
+    @Test
+    fun `resolves an explicit markdown path and falls back to heading and first paragraph`() = runBlocking {
+        repo.resolve("docs/notes").createDirectories()
+        repo.resolve("docs/notes/plan.md").writeText("# Plan\n\nThe plan body.\n")
+
+        val doc = FileTaskDocumentResolver(repo).resolve("docs/notes/plan.md")
+
+        assertEquals("Plan", doc?.title)
+        assertEquals("The plan body.", doc?.excerpt)
+        assertEquals("docs/notes/plan.md", doc?.path)
+    }
+
+    @Test
+    fun `non-document target resolves to null`() = runBlocking {
+        assertNull(FileTaskDocumentResolver(repo).resolve("ext-123"))
+    }
+}

core/events/src/main/kotlin/com/correx/core/events/events/TaskEvents.kt

@@ -0,0 +1,142 @@
+package com.correx.core.events.events
+
+import com.correx.core.events.types.ProjectId
+import com.correx.core.events.types.TaskId
+import com.correx.core.events.types.TaskLinkType
+import com.correx.core.events.types.TaskNoteAuthor
+import com.correx.core.events.types.TaskTargetKind
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+/**
+ * Marker over every task-lifecycle event. Deliberately *not* part of the serialized
+ * [EventPayload] hierarchy — concrete events implement both interfaces — so projections
+ * can recover the owning [taskId] from any payload via `payload as? TaskEvent` without a
+ * giant `when`. Status is never carried on the wire: it is derived by the task reducer
+ * from these facts (mirroring how session status is derived from stage events).
+ */
+sealed interface TaskEvent {
+    val taskId: TaskId
+}
+
+@Serializable
+@SerialName("TaskCreated")
+data class TaskCreatedEvent(
+    override val taskId: TaskId,
+    val projectId: ProjectId,
+    val key: String,
+    val title: String,
+    val goal: String,
+    val acceptanceCriteria: List<String> = emptyList(),
+    val affectedPaths: List<String> = emptyList(),
+) : EventPayload, TaskEvent
+
+@Serializable
+@SerialName("TaskClaimed")
+data class TaskClaimedEvent(
+    override val taskId: TaskId,
+    val claimant: String,
+) : EventPayload, TaskEvent
+
+@Serializable
+@SerialName("TaskReleased")
+data class TaskReleasedEvent(
+    override val taskId: TaskId,
+) : EventPayload, TaskEvent
+
+@Serializable
+@SerialName("TaskBlocked")
+data class TaskBlockedEvent(
+    override val taskId: TaskId,
+    val reason: String,
+) : EventPayload, TaskEvent
+
+@Serializable
+@SerialName("TaskUnblocked")
+data class TaskUnblockedEvent(
+    override val taskId: TaskId,
+) : EventPayload, TaskEvent
+
+@Serializable
+@SerialName("TaskSubmittedForReview")
+data class TaskSubmittedForReviewEvent(
+    override val taskId: TaskId,
+) : EventPayload, TaskEvent
+
+@Serializable
+@SerialName("TaskCompleted")
+data class TaskCompletedEvent(
+    override val taskId: TaskId,
+) : EventPayload, TaskEvent
+
+@Serializable
+@SerialName("TaskReopened")
+data class TaskReopenedEvent(
+    override val taskId: TaskId,
+) : EventPayload, TaskEvent
+
+@Serializable
+@SerialName("TaskCancelled")
+data class TaskCancelledEvent(
+    override val taskId: TaskId,
+    val reason: String? = null,
+) : EventPayload, TaskEvent
+
+@Serializable
+@SerialName("TaskEdited")
+data class TaskEditedEvent(
+    override val taskId: TaskId,
+    val title: String? = null,
+    val goal: String? = null,
+) : EventPayload, TaskEvent
+
+@Serializable
+@SerialName("TaskAcceptanceCriteriaSet")
+data class TaskAcceptanceCriteriaSetEvent(
+    override val taskId: TaskId,
+    val criteria: List<String>,
+) : EventPayload, TaskEvent
+
+@Serializable
+@SerialName("TaskAffectedPathsSet")
+data class TaskAffectedPathsSetEvent(
+    override val taskId: TaskId,
+    val paths: List<String>,
+) : EventPayload, TaskEvent
+
+@Serializable
+@SerialName("TaskLinked")
+data class TaskLinkedEvent(
+    override val taskId: TaskId,
+    val targetId: String,
+    // `linkType`, not `type`: the JSON polymorphic class discriminator is "type".
+    @SerialName("linkType") val type: TaskLinkType,
+    val targetKind: TaskTargetKind,
+) : EventPayload, TaskEvent
+
+@Serializable
+@SerialName("TaskUnlinked")
+data class TaskUnlinkedEvent(
+    override val taskId: TaskId,
+    val targetId: String,
+    @SerialName("linkType") val type: TaskLinkType,
+) : EventPayload, TaskEvent
+
+@Serializable
+@SerialName("TaskNoteAdded")
+data class TaskNoteAddedEvent(
+    override val taskId: TaskId,
+    val author: TaskNoteAuthor,
+    val body: String,
+) : EventPayload, TaskEvent
+
+/**
+ * Soft-delete tombstone. The event stays in the log (history is never rewritten); the board
+ * projection drops the task from active views. Distinct from cancellation, which is a
+ * lifecycle outcome that stays visible as CANCELLED.
+ */
+@Serializable
+@SerialName("TaskDeleted")
+data class TaskDeletedEvent(
+    override val taskId: TaskId,
+) : EventPayload, TaskEvent

core/events/src/main/kotlin/com/correx/core/events/serialization/Serialization.kt

@@ -72,6 +72,22 @@ import com.correx.core.events.events.WorkflowCompletedEvent
 import com.correx.core.events.events.WorkflowFailedEvent
 import com.correx.core.events.events.WorkflowProposedEvent
 import com.correx.core.events.events.WorkflowStartedEvent
+import com.correx.core.events.events.TaskCreatedEvent
+import com.correx.core.events.events.TaskClaimedEvent
+import com.correx.core.events.events.TaskReleasedEvent
+import com.correx.core.events.events.TaskBlockedEvent
+import com.correx.core.events.events.TaskUnblockedEvent
+import com.correx.core.events.events.TaskSubmittedForReviewEvent
+import com.correx.core.events.events.TaskCompletedEvent
+import com.correx.core.events.events.TaskReopenedEvent
+import com.correx.core.events.events.TaskCancelledEvent
+import com.correx.core.events.events.TaskEditedEvent
+import com.correx.core.events.events.TaskAcceptanceCriteriaSetEvent
+import com.correx.core.events.events.TaskAffectedPathsSetEvent
+import com.correx.core.events.events.TaskLinkedEvent
+import com.correx.core.events.events.TaskUnlinkedEvent
+import com.correx.core.events.events.TaskNoteAddedEvent
+import com.correx.core.events.events.TaskDeletedEvent
 import kotlinx.serialization.json.Json
 import kotlinx.serialization.modules.SerializersModule
 import kotlinx.serialization.modules.polymorphic
@@ -151,6 +167,22 @@ val eventModule = SerializersModule {
         subclass(LowQualityExtractionEvent::class)
         subclass(EgressHostsGrantedEvent::class)
         subclass(StaticFindingsRecordedEvent::class)
+        subclass(TaskCreatedEvent::class)
+        subclass(TaskClaimedEvent::class)
+        subclass(TaskReleasedEvent::class)
+        subclass(TaskBlockedEvent::class)
+        subclass(TaskUnblockedEvent::class)
+        subclass(TaskSubmittedForReviewEvent::class)
+        subclass(TaskCompletedEvent::class)
+        subclass(TaskReopenedEvent::class)
+        subclass(TaskCancelledEvent::class)
+        subclass(TaskEditedEvent::class)
+        subclass(TaskAcceptanceCriteriaSetEvent::class)
+        subclass(TaskAffectedPathsSetEvent::class)
+        subclass(TaskLinkedEvent::class)
+        subclass(TaskUnlinkedEvent::class)
+        subclass(TaskNoteAddedEvent::class)
+        subclass(TaskDeletedEvent::class)
     }
 }
 

core/events/src/main/kotlin/com/correx/core/events/types/IdentityTypes.kt

@@ -19,6 +19,10 @@ typealias TransitionId = TypeId
 typealias ArtifactId = TypeId
 
 
+// Tasks types
+typealias TaskId = TypeId
+
+
 // Context types
 typealias ContextPackId = TypeId
 typealias ContextEntryId = TypeId

core/events/src/main/kotlin/com/correx/core/events/types/TaskLinkType.kt

@@ -0,0 +1,18 @@
+package com.correx.core.events.types
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+/**
+ * Edge types for the work graph. A task links to other tasks, artifacts (by [ArtifactId]),
+ * or sessions (by [SessionId]) — the target is stored as a plain id string plus a type.
+ */
+@Serializable
+enum class TaskLinkType {
+    @SerialName("DEPENDS_ON") DEPENDS_ON,
+    @SerialName("BLOCKS") BLOCKS,
+    @SerialName("IMPLEMENTS") IMPLEMENTS,
+    @SerialName("RELATES_TO") RELATES_TO,
+    @SerialName("PRODUCED") PRODUCED,
+    @SerialName("CONTEXT") CONTEXT,
+}

core/events/src/main/kotlin/com/correx/core/events/types/TaskNoteAuthor.kt

@@ -0,0 +1,11 @@
+package com.correx.core.events.types
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+/** Who authored a task note — used to keep the agent and human lanes separable. */
+@Serializable
+enum class TaskNoteAuthor {
+    @SerialName("AGENT") AGENT,
+    @SerialName("HUMAN") HUMAN,
+}

core/events/src/main/kotlin/com/correx/core/events/types/TaskTargetKind.kt

@@ -0,0 +1,16 @@
+package com.correx.core.events.types
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+/**
+ * What a task link points at — recorded on the link so the context bundle dispatches resolution
+ * deterministically (task lookup vs doc resolution vs left-raw) instead of inferring from the id.
+ */
+@Serializable
+enum class TaskTargetKind {
+    @SerialName("TASK") TASK,
+    @SerialName("DOC") DOC,
+    @SerialName("ARTIFACT") ARTIFACT,
+    @SerialName("SESSION") SESSION,
+}

core/tasks/build.gradle

@@ -0,0 +1,12 @@
+plugins {
+    id 'java-library'
+    id 'org.jetbrains.kotlin.jvm'
+    id 'org.jetbrains.kotlin.plugin.serialization'
+}
+
+dependencies {
+    implementation(project(":core:events"))
+    testImplementation(testFixtures(project(":testing:contracts")))
+}
+
+tasks.named("koverVerify").configure { enabled = false }

core/tasks/src/main/kotlin/com/correx/core/tasks/DefaultTaskReducer.kt

@@ -0,0 +1,147 @@
+package com.correx.core.tasks
+
+import com.correx.core.events.events.StoredEvent
+import com.correx.core.events.events.TaskAcceptanceCriteriaSetEvent
+import com.correx.core.events.events.TaskAffectedPathsSetEvent
+import com.correx.core.events.events.TaskBlockedEvent
+import com.correx.core.events.events.TaskCancelledEvent
+import com.correx.core.events.events.TaskClaimedEvent
+import com.correx.core.events.events.TaskCompletedEvent
+import com.correx.core.events.events.TaskCreatedEvent
+import com.correx.core.events.events.TaskDeletedEvent
+import com.correx.core.events.events.TaskEditedEvent
+import com.correx.core.events.events.TaskEvent
+import com.correx.core.events.events.TaskLinkedEvent
+import com.correx.core.events.events.TaskNoteAddedEvent
+import com.correx.core.events.events.TaskReleasedEvent
+import com.correx.core.events.events.TaskReopenedEvent
+import com.correx.core.events.events.TaskSubmittedForReviewEvent
+import com.correx.core.events.events.TaskUnblockedEvent
+import com.correx.core.events.events.TaskUnlinkedEvent
+import kotlinx.datetime.Instant
+
+/**
+ * Folds task events into [TaskState]. Field-update events always apply; lifecycle events
+ * apply only on a legal transition — an illegal transition is ignored and counted in
+ * [TaskState.invalidTransitions] (mirrors how `SessionState` tracks invalid transitions).
+ */
+class DefaultTaskReducer : TaskReducer {
+
+    override fun reduce(state: TaskState, event: StoredEvent): TaskState {
+        val payload = event.payload as? TaskEvent ?: return state
+        val ts = event.metadata.timestamp
+        val base = state.copy(
+            createdAt = state.createdAt ?: ts,
+            updatedAt = ts,
+        )
+        return reduceContent(state, base, payload, ts)
+            ?: reduceTransition(state, base, payload)
+    }
+
+    /** Field updates that do not touch status. Returns null for lifecycle events. */
+    private fun reduceContent(
+        state: TaskState,
+        base: TaskState,
+        payload: TaskEvent,
+        ts: Instant,
+    ): TaskState? = when (payload) {
+        is TaskCreatedEvent -> base.copy(
+            status = TaskStatus.TODO,
+            key = payload.key,
+            projectId = payload.projectId,
+            title = payload.title,
+            goal = payload.goal,
+            acceptanceCriteria = payload.acceptanceCriteria,
+            affectedPaths = payload.affectedPaths,
+        )
+
+        is TaskEditedEvent -> base.copy(
+            title = payload.title ?: state.title,
+            goal = payload.goal ?: state.goal,
+        )
+
+        is TaskAcceptanceCriteriaSetEvent -> base.copy(acceptanceCriteria = payload.criteria)
+
+        is TaskAffectedPathsSetEvent -> base.copy(affectedPaths = payload.paths)
+
+        is TaskLinkedEvent -> base.copy(
+            links = (state.links + TaskLink(payload.targetId, payload.type, payload.targetKind)).distinct(),
+        )
+
+        is TaskUnlinkedEvent -> base.copy(
+            links = state.links.filterNot {
+                it.targetId == payload.targetId && it.type == payload.type
+            },
+        )
+
+        is TaskNoteAddedEvent -> base.copy(
+            notes = state.notes + TaskNote(payload.author, payload.body, ts),
+        )
+
+        is TaskDeletedEvent -> base.copy(deleted = true)
+
+        else -> null
+    }
+
+    /** Lifecycle events: apply on a legal transition, else count it invalid. */
+    private fun reduceTransition(
+        state: TaskState,
+        base: TaskState,
+        payload: TaskEvent,
+    ): TaskState {
+        val from = state.status
+        return when (payload) {
+            is TaskClaimedEvent ->
+                base.transitionTo(TaskStatus.IN_PROGRESS, from == TaskStatus.TODO) {
+                    it.copy(claimant = payload.claimant)
+                }
+
+            is TaskReleasedEvent ->
+                base.transitionTo(TaskStatus.TODO, from == TaskStatus.IN_PROGRESS) {
+                    it.copy(claimant = null)
+                }
+
+            is TaskBlockedEvent ->
+                base.transitionTo(TaskStatus.BLOCKED, from in WORKING)
+
+            is TaskUnblockedEvent ->
+                base.transitionTo(
+                    if (state.claimant != null) TaskStatus.IN_PROGRESS else TaskStatus.TODO,
+                    from == TaskStatus.BLOCKED,
+                )
+
+            is TaskSubmittedForReviewEvent ->
+                base.transitionTo(TaskStatus.IN_REVIEW, from == TaskStatus.IN_PROGRESS)
+
+            is TaskCompletedEvent ->
+                base.transitionTo(TaskStatus.DONE, from == TaskStatus.IN_REVIEW)
+
+            is TaskReopenedEvent ->
+                base.transitionTo(TaskStatus.TODO, from in TERMINAL) {
+                    it.copy(claimant = null)
+                }
+
+            is TaskCancelledEvent ->
+                base.transitionTo(TaskStatus.CANCELLED, from in CANCELLABLE)
+
+            else -> state
+        } ?: state.copy(invalidTransitions = state.invalidTransitions + 1)
+    }
+
+    private inline fun TaskState.transitionTo(
+        to: TaskStatus,
+        legal: Boolean,
+        mutate: (TaskState) -> TaskState = { it },
+    ): TaskState? = if (legal) mutate(copy(status = to)) else null
+
+    private companion object {
+        val WORKING = setOf(TaskStatus.TODO, TaskStatus.IN_PROGRESS, TaskStatus.IN_REVIEW)
+        val TERMINAL = setOf(TaskStatus.DONE, TaskStatus.CANCELLED)
+        val CANCELLABLE = setOf(
+            TaskStatus.TODO,
+            TaskStatus.IN_PROGRESS,
+            TaskStatus.IN_REVIEW,
+            TaskStatus.BLOCKED,
+        )
+    }
+}

core/tasks/src/main/kotlin/com/correx/core/tasks/DefaultTaskRepository.kt

@@ -0,0 +1,26 @@
+package com.correx.core.tasks
+
+import com.correx.core.events.types.SessionId
+import com.correx.core.events.types.TaskId
+import com.correx.core.sessions.projections.replay.EventReplayer
+
+/**
+ * Reads a project's task board by replaying its stream. Mirrors `DefaultSessionRepository`:
+ * the repository is a thin read model over an [EventReplayer]; the event log is the source
+ * of truth and the board is rebuilt from it.
+ */
+class DefaultTaskRepository(
+    private val replayer: EventReplayer<TaskBoard>,
+    private val streamId: SessionId,
+) {
+
+    fun board(): TaskBoard = replayer.rebuild(streamId)
+
+    fun getTask(taskId: TaskId): Task? =
+        board()[taskId]?.takeUnless { it.deleted }?.let { Task(taskId, it) }
+
+    fun list(): List<Task> =
+        board().filterValues { !it.deleted }.map { (id, state) -> Task(id, state) }
+
+    fun count(): Int = list().size
+}

core/tasks/src/main/kotlin/com/correx/core/tasks/Task.kt

@@ -0,0 +1,8 @@
+package com.correx.core.tasks
+
+import com.correx.core.events.types.TaskId
+
+data class Task(
+    val taskId: TaskId,
+    val state: TaskState,
+)

core/tasks/src/main/kotlin/com/correx/core/tasks/TaskBoard.kt

@@ -0,0 +1,6 @@
+package com.correx.core.tasks
+
+import com.correx.core.events.types.TaskId
+
+/** All tasks in a project stream, keyed by id — the unit a single replay produces. */
+typealias TaskBoard = Map<TaskId, TaskState>

core/tasks/src/main/kotlin/com/correx/core/tasks/TaskBoardProjector.kt

@@ -0,0 +1,22 @@
+package com.correx.core.tasks
+
+import com.correx.core.events.events.StoredEvent
+import com.correx.core.events.events.TaskEvent
+import com.correx.core.sessions.projections.Projection
+
+/**
+ * Folds a per-project task stream into a [TaskBoard]. Each event is routed to its owning
+ * task by [TaskEvent.taskId]; non-task payloads leave the board untouched.
+ */
+class TaskBoardProjector(
+    private val reducer: TaskReducer,
+) : Projection<TaskBoard> {
+
+    override fun initial(): TaskBoard = emptyMap()
+
+    override fun apply(state: TaskBoard, event: StoredEvent): TaskBoard {
+        val taskId = (event.payload as? TaskEvent)?.taskId ?: return state
+        val current = state[taskId] ?: TaskState()
+        return state + (taskId to reducer.reduce(current, event))
+    }
+}

core/tasks/src/main/kotlin/com/correx/core/tasks/TaskContextAssembler.kt

@@ -0,0 +1,109 @@
+package com.correx.core.tasks
+
+import com.correx.core.events.types.TaskId
+import com.correx.core.events.types.TaskTargetKind
+
+/**
+ * Assembles a [TaskContextBundle] for a task. Links are partitioned by their recorded
+ * [com.correx.core.events.types.TaskTargetKind]: TASK targets are resolved to [RelatedTask]
+ * dependencies (with live status), DOC targets are resolved inline via [documentResolver], and
+ * anything unresolved (or ARTIFACT/SESSION, not inlined yet) becomes a raw [RelatedLink].
+ *
+ * When a [TaskKnowledgeRetriever] is supplied, the bundle is additionally enriched with
+ * semantically-relevant snippets over the task's title+goal. Retrieval and doc-resolution failures
+ * are swallowed (the bundle still returns) so context assembly never fails on a flaky dependency.
+ */
+class TaskContextAssembler(
+    private val service: TaskService,
+    private val retriever: TaskKnowledgeRetriever? = null,
+    private val documentResolver: TaskDocumentResolver? = null,
+    private val knowledgeLimit: Int = DEFAULT_KNOWLEDGE_LIMIT,
+) {
+
+    suspend fun assemble(taskId: TaskId): TaskContextBundle? {
+        val state = service.getTask(taskId)?.state ?: return null
+
+        val dependencies = mutableListOf<RelatedTask>()
+        val documents = mutableListOf<TaskDocument>()
+        val related = mutableListOf<RelatedLink>()
+        for (link in state.links) {
+            // Resolution dispatches on the link's recorded targetKind — no guessing from the id.
+            // A kind whose resolution comes up empty (missing task, unresolvable doc, or an
+            // ARTIFACT/SESSION we don't inline yet) falls back to a raw related link.
+            when (link.targetKind) {
+                TaskTargetKind.TASK -> addTask(link, dependencies, related)
+                TaskTargetKind.DOC -> addDocument(link, documents, related)
+                TaskTargetKind.ARTIFACT, TaskTargetKind.SESSION ->
+                    related += RelatedLink(link.targetId, link.type.name)
+            }
+        }
+
+        return TaskContextBundle(
+            id = taskId.value,
+            key = state.key,
+            status = state.status.name,
+            title = state.title,
+            goal = state.goal,
+            acceptanceCriteria = state.acceptanceCriteria,
+            relevantFiles = state.affectedPaths,
+            dependencies = dependencies,
+            documents = documents,
+            relatedLinks = related,
+            notes = state.notes.map { NoteEntry(it.author.name, it.body) },
+            relevantKnowledge = retrieveKnowledge(state),
+        )
+    }
+
+    private fun addTask(
+        link: TaskLink,
+        dependencies: MutableList<RelatedTask>,
+        related: MutableList<RelatedLink>,
+    ) {
+        val linked = runCatching { service.getTask(TaskId(link.targetId)) }.getOrNull()
+        if (linked != null) {
+            dependencies += RelatedTask(
+                id = linked.taskId.value,
+                status = linked.state.status.name,
+                title = linked.state.title,
+                link = link.type.name,
+            )
+        } else {
+            related += RelatedLink(link.targetId, link.type.name)
+        }
+    }
+
+    private suspend fun addDocument(
+        link: TaskLink,
+        documents: MutableList<TaskDocument>,
+        related: MutableList<RelatedLink>,
+    ) {
+        val doc = resolveDocument(link.targetId)
+        if (doc != null) {
+            documents += TaskDocument(
+                targetId = link.targetId,
+                type = link.type.name,
+                title = doc.title,
+                path = doc.path,
+                excerpt = doc.excerpt,
+            )
+        } else {
+            related += RelatedLink(link.targetId, link.type.name)
+        }
+    }
+
+    private suspend fun resolveDocument(targetId: String): ResolvedDocument? {
+        val resolver = documentResolver ?: return null
+        return runCatching { resolver.resolve(targetId) }.getOrNull()
+    }
+
+    private suspend fun retrieveKnowledge(state: TaskState): List<KnowledgeHit> {
+        val active = retriever ?: return emptyList()
+        val query = listOfNotNull(state.title, state.goal).joinToString(" ").trim()
+        if (query.isEmpty()) return emptyList()
+        return runCatching { active.retrieve(query, knowledgeLimit) }.getOrDefault(emptyList())
+    }
+
+    private companion object {
+        const val DEFAULT_KNOWLEDGE_LIMIT = 5
+    }
+}

core/tasks/src/main/kotlin/com/correx/core/tasks/TaskContextBundle.kt

@@ -0,0 +1,83 @@
+package com.correx.core.tasks
+
+import kotlinx.serialization.Serializable
+
+/**
+ * Token-optimized context bundle for a task — the single payload an agent needs to start work:
+ * the task itself, its acceptance criteria, resolved dependency tasks, the related (non-task)
+ * links it should fetch, the relevant files, and notes. Assembled by [TaskContextAssembler].
+ */
+@Serializable
+data class TaskContextBundle(
+    val id: String,
+    val key: String?,
+    val status: String,
+    val title: String?,
+    val goal: String?,
+    val acceptanceCriteria: List<String>,
+    val relevantFiles: List<String>,
+    val dependencies: List<RelatedTask>,
+    val documents: List<TaskDocument>,
+    val relatedLinks: List<RelatedLink>,
+    val notes: List<NoteEntry>,
+    val relevantKnowledge: List<KnowledgeHit> = emptyList(),
+) {
+    /** Compact, label-per-line rendering for tool output (cheaper than JSON for the model). */
+    fun render(): String = buildString {
+        appendLine("task $id [$status] ${title.orEmpty()}".trimEnd())
+        goal?.let { appendLine("goal: $it") }
+        appendList("acceptance_criteria", acceptanceCriteria) { "  - $it" }
+        if (relevantFiles.isNotEmpty()) appendLine("relevant_files: ${relevantFiles.joinToString(", ")}")
+        appendList("dependencies", dependencies) { "  - ${it.id} [${it.status}] ${it.title.orEmpty()} (${it.link})".trimEnd() }
+        appendList("documents", documents) { "  - ${it.targetId} (${it.type}) ${it.title} [${it.path}]: ${it.excerpt}" }
+        appendList("related", relatedLinks) { "  - ${it.targetId} (${it.type})" }
+        appendList("relevant_knowledge", relevantKnowledge) { "  - ${it.source}: ${it.text}" }
+        appendList("notes", notes) { "  - [${it.author}] ${it.body}" }
+    }.trimEnd()
+
+    private fun <T> StringBuilder.appendList(label: String, items: List<T>, line: (T) -> String) {
+        if (items.isEmpty()) return
+        appendLine("$label:")
+        items.forEach { appendLine(line(it)) }
+    }
+}
+
+/** A linked task resolved against the board: enough for the agent to judge readiness. */
+@Serializable
+data class RelatedTask(
+    val id: String,
+    val status: String,
+    val title: String?,
+    val link: String,
+)
+
+/** A link whose target resolved to a document (ADR/doc): title + excerpt inlined for the agent. */
+@Serializable
+data class TaskDocument(
+    val targetId: String,
+    val type: String,
+    val title: String,
+    val path: String,
+    val excerpt: String,
+)
+
+/** A link whose target is neither a task nor a resolvable doc — left for the agent to fetch. */
+@Serializable
+data class RelatedLink(
+    val targetId: String,
+    val type: String,
+)
+
+@Serializable
+data class NoteEntry(
+    val author: String,
+    val body: String,
+)
+
+/** A semantically-retrieved snippet relevant to the task's goal (e.g. a repo file or doc). */
+@Serializable
+data class KnowledgeHit(
+    val source: String,
+    val text: String,
+    val score: Double,
+)

core/tasks/src/main/kotlin/com/correx/core/tasks/TaskCounterProjection.kt

@@ -0,0 +1,24 @@
+package com.correx.core.tasks
+
+import com.correx.core.events.events.StoredEvent
+import com.correx.core.events.events.TaskCreatedEvent
+import com.correx.core.sessions.projections.Projection
+
+/**
+ * Counts created tasks in a project stream. The numeric suffix of a human key
+ * (`<prefix>-<n>`) is taken from this count, so ids never collide even after a task is
+ * cancelled — it counts creations, not currently-live tasks.
+ */
+class TaskCounterProjection(
+    private val projectId: String,
+) : Projection<TaskCounterState> {
+
+    override fun initial(): TaskCounterState =
+        TaskCounterState(projectId, 0)
+
+    override fun apply(
+        state: TaskCounterState,
+        event: StoredEvent,
+    ): TaskCounterState =
+        if (event.payload is TaskCreatedEvent) state.copy(count = state.count + 1) else state
+}

core/tasks/src/main/kotlin/com/correx/core/tasks/TaskCounterState.kt

@@ -0,0 +1,6 @@
+package com.correx.core.tasks
+
+data class TaskCounterState(
+    val projectId: String,
+    val count: Int,
+)

core/tasks/src/main/kotlin/com/correx/core/tasks/TaskDocumentResolver.kt

@@ -0,0 +1,21 @@
+package com.correx.core.tasks
+
+import kotlinx.serialization.Serializable
+
+/**
+ * Port for resolving a link target (e.g. "adr-7" or a "docs/…/x.md" path) to an inline document
+ * summary, so the context bundle can carry the doc's title + excerpt instead of a bare id the
+ * agent has to fetch separately. Implemented in a higher layer (apps/server reads the repo's
+ * docs); `core:tasks` stays decoupled from the filesystem. Returns null when the target is not a
+ * resolvable document — the link then stays a raw related link.
+ */
+interface TaskDocumentResolver {
+    suspend fun resolve(targetId: String): ResolvedDocument?
+}
+
+@Serializable
+data class ResolvedDocument(
+    val title: String,
+    val path: String,
+    val excerpt: String,
+)

core/tasks/src/main/kotlin/com/correx/core/tasks/TaskKnowledgeRetriever.kt

@@ -0,0 +1,11 @@
+package com.correx.core.tasks
+
+/**
+ * Port for semantic enrichment of a task context bundle. Implemented in a higher layer
+ * (apps/server bridges it to the L3 vector retriever) and injected into [TaskContextAssembler];
+ * `core:tasks` stays decoupled from the retrieval stack. Implementations must be side-effect-free
+ * and tolerate being called with an arbitrary natural-language query.
+ */
+interface TaskKnowledgeRetriever {
+    suspend fun retrieve(query: String, limit: Int): List<KnowledgeHit>
+}

core/tasks/src/main/kotlin/com/correx/core/tasks/TaskLink.kt

@@ -0,0 +1,11 @@
+package com.correx.core.tasks
+
+import com.correx.core.events.types.TaskLinkType
+import com.correx.core.events.types.TaskTargetKind
+
+/** One edge in the work graph: a typed pointer from a task to another entity, tagged by kind. */
+data class TaskLink(
+    val targetId: String,
+    val type: TaskLinkType,
+    val targetKind: TaskTargetKind,
+)

core/tasks/src/main/kotlin/com/correx/core/tasks/TaskNote.kt

@@ -0,0 +1,11 @@
+package com.correx.core.tasks
+
+import com.correx.core.events.types.TaskNoteAuthor
+import kotlinx.datetime.Instant
+
+/** A note on a task, kept in agent/human lanes so consumers can filter by author. */
+data class TaskNote(
+    val author: TaskNoteAuthor,
+    val body: String,
+    val at: Instant,
+)

core/tasks/src/main/kotlin/com/correx/core/tasks/TaskReducer.kt

@@ -0,0 +1,10 @@
+package com.correx.core.tasks
+
+import com.correx.core.events.events.StoredEvent
+
+interface TaskReducer {
+    fun reduce(
+        state: TaskState,
+        event: StoredEvent,
+    ): TaskState
+}

core/tasks/src/main/kotlin/com/correx/core/tasks/TaskService.kt

@@ -0,0 +1,166 @@
+package com.correx.core.tasks
+
+import com.correx.core.events.events.EventMetadata
+import com.correx.core.events.events.EventPayload
+import com.correx.core.events.events.NewEvent
+import com.correx.core.events.events.TaskAcceptanceCriteriaSetEvent
+import com.correx.core.events.events.TaskAffectedPathsSetEvent
+import com.correx.core.events.events.TaskBlockedEvent
+import com.correx.core.events.events.TaskCancelledEvent
+import com.correx.core.events.events.TaskClaimedEvent
+import com.correx.core.events.events.TaskCompletedEvent
+import com.correx.core.events.events.TaskCreatedEvent
+import com.correx.core.events.events.TaskDeletedEvent
+import com.correx.core.events.events.TaskEditedEvent
+import com.correx.core.events.events.TaskLinkedEvent
+import com.correx.core.events.events.TaskNoteAddedEvent
+import com.correx.core.events.events.TaskReleasedEvent
+import com.correx.core.events.events.TaskReopenedEvent
+import com.correx.core.events.events.TaskSubmittedForReviewEvent
+import com.correx.core.events.events.TaskUnblockedEvent
+import com.correx.core.events.events.TaskUnlinkedEvent
+import com.correx.core.events.stores.EventStore
+import com.correx.core.events.types.EventId
+import com.correx.core.events.types.ProjectId
+import com.correx.core.events.types.TaskId
+import com.correx.core.events.types.TaskLinkType
+import com.correx.core.events.types.TaskNoteAuthor
+import com.correx.core.events.types.TaskTargetKind
+import com.correx.core.sessions.projections.replay.DefaultEventReplayer
+import kotlinx.datetime.Clock
+import java.util.UUID
+
+/**
+ * Write path for tasks: turns intents into events appended to the shared [EventStore].
+ * The event log stays the single source of truth — the board is rebuilt by replay, never
+ * stored. All task events for a project live in one stream ([TaskStreams.forProject]).
+ *
+ * Keys are `<project>-<n>`, so a task's project is recoverable from its id; mutating
+ * methods therefore need only the [TaskId]. They return the rebuilt [Task], or null when the
+ * task does not exist (so callers — e.g. tools — can report a clean failure). Mutations that
+ * are illegal for the current status are still appended but are no-ops on replay (the reducer
+ * counts them in `invalidTransitions`).
+ */
+@Suppress("TooManyFunctions")
+class TaskService(
+    private val eventStore: EventStore,
+    private val clock: Clock = Clock.System,
+) {
+    private val boardReplayer =
+        DefaultEventReplayer(eventStore, TaskBoardProjector(DefaultTaskReducer()))
+
+    fun board(projectId: ProjectId): TaskBoard =
+        boardReplayer.rebuild(TaskStreams.forProject(projectId))
+
+    fun list(projectId: ProjectId): List<Task> =
+        board(projectId).filterValues { !it.deleted }.map { (id, state) -> Task(id, state) }
+
+    fun getTask(taskId: TaskId): Task? {
+        val state = board(projectOf(taskId))[taskId] ?: return null
+        return if (state.deleted) null else Task(taskId, state)
+    }
+
+    suspend fun createTask(
+        projectId: ProjectId,
+        title: String,
+        goal: String,
+        acceptanceCriteria: List<String> = emptyList(),
+        affectedPaths: List<String> = emptyList(),
+    ): Task {
+        val key = nextKey(projectId)
+        val taskId = TaskId(key)
+        append(
+            projectId,
+            TaskCreatedEvent(
+                taskId = taskId,
+                projectId = projectId,
+                key = key,
+                title = title,
+                goal = goal,
+                acceptanceCriteria = acceptanceCriteria,
+                affectedPaths = affectedPaths,
+            ),
+        )
+        return requireNotNull(getTask(taskId)) { "task $key missing after creation" }
+    }
+
+    suspend fun edit(taskId: TaskId, title: String? = null, goal: String? = null): Task? =
+        mutate(taskId) { TaskEditedEvent(it, title = title, goal = goal) }
+
+    suspend fun setAcceptanceCriteria(taskId: TaskId, criteria: List<String>): Task? =
+        mutate(taskId) { TaskAcceptanceCriteriaSetEvent(it, criteria) }
+
+    suspend fun setAffectedPaths(taskId: TaskId, paths: List<String>): Task? =
+        mutate(taskId) { TaskAffectedPathsSetEvent(it, paths) }
+
+    suspend fun claim(taskId: TaskId, claimant: String): Task? =
+        mutate(taskId) { TaskClaimedEvent(it, claimant) }
+
+    suspend fun release(taskId: TaskId): Task? =
+        mutate(taskId) { TaskReleasedEvent(it) }
+
+    suspend fun block(taskId: TaskId, reason: String): Task? =
+        mutate(taskId) { TaskBlockedEvent(it, reason) }
+
+    suspend fun unblock(taskId: TaskId): Task? =
+        mutate(taskId) { TaskUnblockedEvent(it) }
+
+    suspend fun submitForReview(taskId: TaskId): Task? =
+        mutate(taskId) { TaskSubmittedForReviewEvent(it) }
+
+    suspend fun complete(taskId: TaskId): Task? =
+        mutate(taskId) { TaskCompletedEvent(it) }
+
+    suspend fun reopen(taskId: TaskId): Task? =
+        mutate(taskId) { TaskReopenedEvent(it) }
+
+    suspend fun cancel(taskId: TaskId, reason: String? = null): Task? =
+        mutate(taskId) { TaskCancelledEvent(it, reason) }
+
+    suspend fun link(taskId: TaskId, targetId: String, type: TaskLinkType, targetKind: TaskTargetKind): Task? =
+        mutate(taskId) { TaskLinkedEvent(it, targetId, type, targetKind) }
+
+    suspend fun unlink(taskId: TaskId, targetId: String, type: TaskLinkType): Task? =
+        mutate(taskId) { TaskUnlinkedEvent(it, targetId, type) }
+
+    suspend fun addNote(taskId: TaskId, author: TaskNoteAuthor, body: String): Task? =
+        mutate(taskId) { TaskNoteAddedEvent(it, author, body) }
+
+    /** Soft delete: appends a tombstone. After this, [getTask] returns null and [list] omits it. */
+    suspend fun delete(taskId: TaskId): Boolean {
+        if (getTask(taskId) == null) return false
+        append(projectOf(taskId), TaskDeletedEvent(taskId))
+        return true
+    }
+
+    private suspend fun mutate(taskId: TaskId, event: (TaskId) -> EventPayload): Task? {
+        if (getTask(taskId) == null) return null
+        append(projectOf(taskId), event(taskId))
+        return getTask(taskId)
+    }
+
+    private fun nextKey(projectId: ProjectId): String {
+        val count = DefaultEventReplayer(eventStore, TaskCounterProjection(projectId.value))
+            .rebuild(TaskStreams.forProject(projectId)).count
+        return "${projectId.value}-${count + 1}"
+    }
+
+    private fun projectOf(taskId: TaskId): ProjectId =
+        ProjectId(taskId.value.substringBeforeLast('-'))
+
+    private suspend fun append(projectId: ProjectId, payload: EventPayload) {
+        eventStore.append(
+            NewEvent(
+                metadata = EventMetadata(
+                    eventId = EventId(UUID.randomUUID().toString()),
+                    sessionId = TaskStreams.forProject(projectId),
+                    timestamp = clock.now(),
+                    schemaVersion = 1,
+                    causationId = null,
+                    correlationId = null,
+                ),
+                payload = payload,
+            ),
+        )
+    }
+}

core/tasks/src/main/kotlin/com/correx/core/tasks/TaskState.kt

@@ -0,0 +1,26 @@
+package com.correx.core.tasks
+
+import com.correx.core.events.types.ProjectId
+import kotlinx.datetime.Instant
+
+/**
+ * Projected state of a single task, rebuilt by folding its events through [TaskReducer].
+ * Mirrors the shape of `SessionState`: defaults make the empty/pre-creation state valid.
+ */
+data class TaskState(
+    val status: TaskStatus = TaskStatus.TODO,
+    val key: String? = null,
+    val projectId: ProjectId? = null,
+    val title: String? = null,
+    val goal: String? = null,
+    val acceptanceCriteria: List<String> = emptyList(),
+    val affectedPaths: List<String> = emptyList(),
+    val links: List<TaskLink> = emptyList(),
+    val claimant: String? = null,
+    val notes: List<TaskNote> = emptyList(),
+    val createdAt: Instant? = null,
+    val updatedAt: Instant? = null,
+    val invalidTransitions: Int = 0,
+    /** Soft-deleted tombstone — repository reads hide these; the events remain in the log. */
+    val deleted: Boolean = false,
+)

core/tasks/src/main/kotlin/com/correx/core/tasks/TaskStatus.kt

@@ -0,0 +1,16 @@
+package com.correx.core.tasks
+
+/**
+ * Derived task lifecycle status. Never serialized on events — the reducer computes it from
+ * the lifecycle facts. Workflow: TODO → IN_PROGRESS → IN_REVIEW → DONE, with BLOCKED
+ * (reversible) and CANCELLED (terminal).
+ */
+enum class TaskStatus {
+    TODO,
+    IN_PROGRESS,
+    IN_REVIEW,
+    BLOCKED,
+    DONE,
+    CANCELLED,
+    ;
+}

core/tasks/src/main/kotlin/com/correx/core/tasks/TaskStreams.kt

@@ -0,0 +1,16 @@
+package com.correx.core.tasks
+
+import com.correx.core.events.types.ProjectId
+import com.correx.core.events.types.SessionId
+
+/**
+ * Task events live in one event stream per project, keyed `tasks:<projectId>`. The
+ * `tasks:` prefix keeps these streams distinguishable from real agent sessions (the
+ * EventStore is partitioned by [SessionId], and [SessionId]/`TaskId` are both `TypeId`).
+ */
+object TaskStreams {
+    const val PREFIX: String = "tasks:"
+
+    fun forProject(projectId: ProjectId): SessionId =
+        SessionId("$PREFIX${projectId.value}")
+}

core/tasks/src/test/kotlin/com/correx/core/tasks/DefaultTaskReducerTest.kt

@@ -0,0 +1,147 @@
+package com.correx.core.tasks
+
+import com.correx.core.events.events.EventMetadata
+import com.correx.core.events.events.EventPayload
+import com.correx.core.events.events.StoredEvent
+import com.correx.core.events.events.TaskAcceptanceCriteriaSetEvent
+import com.correx.core.events.events.TaskBlockedEvent
+import com.correx.core.events.events.TaskClaimedEvent
+import com.correx.core.events.events.TaskCompletedEvent
+import com.correx.core.events.events.TaskCreatedEvent
+import com.correx.core.events.events.TaskLinkedEvent
+import com.correx.core.events.events.TaskNoteAddedEvent
+import com.correx.core.events.events.RefinementIterationEvent
+import com.correx.core.events.events.TaskSubmittedForReviewEvent
+import com.correx.core.events.events.TaskUnblockedEvent
+import com.correx.core.events.types.EventId
+import com.correx.core.events.types.ProjectId
+import com.correx.core.events.types.SessionId
+import com.correx.core.events.types.TaskId
+import com.correx.core.events.types.TaskLinkType
+import com.correx.core.events.types.TaskNoteAuthor
+import com.correx.core.events.types.TaskTargetKind
+import kotlinx.datetime.Instant
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertNull
+import org.junit.jupiter.api.Test
+
+class DefaultTaskReducerTest {
+
+    private val reducer = DefaultTaskReducer()
+    private val taskId = TaskId("auth-1")
+    private val projectId = ProjectId("auth")
+
+    private fun stored(payload: EventPayload, seq: Long = 1L) = StoredEvent(
+        metadata = EventMetadata(
+            eventId = EventId("e-$seq"),
+            sessionId = SessionId("tasks:auth"),
+            timestamp = Instant.parse("2026-01-0${seq}T00:00:00Z"),
+            schemaVersion = 1,
+            causationId = null,
+            correlationId = null,
+        ),
+        sequence = seq,
+        sessionSequence = seq,
+        payload = payload,
+    )
+
+    private fun reduceAll(vararg payloads: EventPayload): TaskState =
+        payloads.foldIndexed(TaskState()) { i, state, payload ->
+            reducer.reduce(state, stored(payload, (i + 1).toLong()))
+        }
+
+    private fun created() = TaskCreatedEvent(
+        taskId = taskId,
+        projectId = projectId,
+        key = "auth-1",
+        title = "Implement JWT refresh flow",
+        goal = "users stay authenticated",
+    )
+
+    @Test
+    fun `TaskCreatedEvent sets fields and TODO status`() {
+        val state = reduceAll(created())
+
+        assertEquals(TaskStatus.TODO, state.status)
+        assertEquals("auth-1", state.key)
+        assertEquals(projectId, state.projectId)
+        assertEquals("Implement JWT refresh flow", state.title)
+        assertEquals("users stay authenticated", state.goal)
+        assertEquals(Instant.parse("2026-01-01T00:00:00Z"), state.createdAt)
+        assertEquals(0, state.invalidTransitions)
+    }
+
+    @Test
+    fun `claiming moves TODO to IN_PROGRESS and records claimant`() {
+        val state = reduceAll(created(), TaskClaimedEvent(taskId, claimant = "claude-opus"))
+
+        assertEquals(TaskStatus.IN_PROGRESS, state.status)
+        assertEquals("claude-opus", state.claimant)
+    }
+
+    @Test
+    fun `happy path created to claimed to review to done`() {
+        val state = reduceAll(
+            created(),
+            TaskClaimedEvent(taskId, claimant = "claude-opus"),
+            TaskSubmittedForReviewEvent(taskId),
+            TaskCompletedEvent(taskId),
+        )
+
+        assertEquals(TaskStatus.DONE, state.status)
+        assertEquals(0, state.invalidTransitions)
+    }
+
+    @Test
+    fun `unblock restores the working status of a claimed task`() {
+        val state = reduceAll(
+            created(),
+            TaskClaimedEvent(taskId, claimant = "claude-opus"),
+            TaskBlockedEvent(taskId, reason = "waiting on auth-138"),
+            TaskUnblockedEvent(taskId),
+        )
+
+        assertEquals(TaskStatus.IN_PROGRESS, state.status)
+        assertEquals(0, state.invalidTransitions)
+    }
+
+    @Test
+    fun `illegal transition is ignored and counted`() {
+        val state = reduceAll(created(), TaskCompletedEvent(taskId))
+
+        assertEquals(TaskStatus.TODO, state.status)
+        assertEquals(1, state.invalidTransitions)
+    }
+
+    @Test
+    fun `links and notes accumulate without affecting status`() {
+        val state = reduceAll(
+            created(),
+            TaskAcceptanceCriteriaSetEvent(taskId, listOf("refresh endpoint exists")),
+            TaskLinkedEvent(taskId, targetId = "auth-138", type = TaskLinkType.DEPENDS_ON, targetKind = TaskTargetKind.TASK),
+            TaskNoteAddedEvent(taskId, author = TaskNoteAuthor.AGENT, body = "migration failed"),
+        )
+
+        assertEquals(TaskStatus.TODO, state.status)
+        assertEquals(listOf("refresh endpoint exists"), state.acceptanceCriteria)
+        assertEquals(1, state.links.size)
+        assertEquals(TaskLink("auth-138", TaskLinkType.DEPENDS_ON, TaskTargetKind.TASK), state.links.single())
+        assertEquals(1, state.notes.size)
+        assertEquals(TaskNoteAuthor.AGENT, state.notes.single().author)
+    }
+
+    @Test
+    fun `non-task payload leaves state untouched`() {
+        val before = reduceAll(created())
+        val nonTask = RefinementIterationEvent(
+            sessionId = SessionId("s-1"),
+            cycleKey = "implement->review",
+            iteration = 1,
+            maxIterations = 3,
+        )
+        val after = reducer.reduce(before, stored(nonTask, seq = 9L))
+
+        assertEquals(before, after)
+        assertNull(after.claimant)
+    }
+}

core/tasks/src/test/kotlin/com/correx/core/tasks/InMemoryEventStore.kt

@@ -0,0 +1,50 @@
+package com.correx.core.tasks
+
+import com.correx.core.events.events.NewEvent
+import com.correx.core.events.events.StoredEvent
+import com.correx.core.events.stores.EventStore
+import com.correx.core.events.types.SessionId
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.emptyFlow
+
+/** Minimal append-capable in-memory event store for core:tasks tests, keyed per session. */
+internal class InMemoryEventStore : EventStore {
+    private val events = mutableListOf<StoredEvent>()
+    private var global = 0L
+    private val perSession = mutableMapOf<SessionId, Long>()
+
+    override suspend fun append(event: NewEvent): StoredEvent {
+        global += 1
+        val seq = (perSession[event.metadata.sessionId] ?: 0L) + 1
+        perSession[event.metadata.sessionId] = seq
+        val stored = StoredEvent(
+            metadata = event.metadata,
+            sequence = global,
+            sessionSequence = seq,
+            payload = event.payload,
+        )
+        events += stored
+        return stored
+    }
+
+    override suspend fun appendAll(events: List<NewEvent>): List<StoredEvent> = events.map { append(it) }
+
+    override fun read(sessionId: SessionId): List<StoredEvent> =
+        events.filter { it.metadata.sessionId == sessionId }.sortedBy { it.sessionSequence }
+
+    override fun readFrom(sessionId: SessionId, fromSequence: Long): List<StoredEvent> =
+        read(sessionId).filter { it.sessionSequence >= fromSequence }
+
+    override fun lastSequence(sessionId: SessionId): Long? =
+        read(sessionId).maxOfOrNull { it.sessionSequence }
+
+    override fun subscribe(sessionId: SessionId): Flow<StoredEvent> = emptyFlow()
+
+    override fun subscribeAll(): Flow<StoredEvent> = emptyFlow()
+
+    override suspend fun lastGlobalSequence(): Long = global
+
+    override fun allEvents(): Sequence<StoredEvent> = events.asSequence()
+
+    override fun allSessionIds(): Set<SessionId> = events.map { it.metadata.sessionId }.toSet()
+}

core/tasks/src/test/kotlin/com/correx/core/tasks/TaskBoardProjectorTest.kt

@@ -0,0 +1,74 @@
+package com.correx.core.tasks
+
+import com.correx.core.events.events.EventMetadata
+import com.correx.core.events.events.EventPayload
+import com.correx.core.events.events.RefinementIterationEvent
+import com.correx.core.events.events.StoredEvent
+import com.correx.core.events.events.TaskClaimedEvent
+import com.correx.core.events.events.TaskCreatedEvent
+import com.correx.core.events.types.EventId
+import com.correx.core.events.types.ProjectId
+import com.correx.core.events.types.SessionId
+import com.correx.core.events.types.TaskId
+import kotlinx.datetime.Instant
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Test
+
+class TaskBoardProjectorTest {
+
+    private val projector = TaskBoardProjector(DefaultTaskReducer())
+    private val projectId = ProjectId("auth")
+
+    private fun stored(payload: EventPayload, seq: Long) = StoredEvent(
+        metadata = EventMetadata(
+            eventId = EventId("e-$seq"),
+            sessionId = SessionId("tasks:auth"),
+            timestamp = Instant.parse("2026-01-01T00:00:0${seq}Z"),
+            schemaVersion = 1,
+            causationId = null,
+            correlationId = null,
+        ),
+        sequence = seq,
+        sessionSequence = seq,
+        payload = payload,
+    )
+
+    private fun created(id: TaskId) =
+        TaskCreatedEvent(id, projectId, id.value, "title ${id.value}", "goal")
+
+    private fun fold(vararg events: StoredEvent): TaskBoard =
+        events.fold(projector.initial()) { board, event -> projector.apply(board, event) }
+
+    @Test
+    fun `interleaved events update each task independently`() {
+        val one = TaskId("auth-1")
+        val two = TaskId("auth-2")
+
+        val board = fold(
+            stored(created(one), 1),
+            stored(created(two), 2),
+            stored(TaskClaimedEvent(one, claimant = "claude-opus"), 3),
+        )
+
+        assertEquals(2, board.size)
+        assertEquals(TaskStatus.IN_PROGRESS, board[one]?.status)
+        assertEquals("claude-opus", board[one]?.claimant)
+        assertEquals(TaskStatus.TODO, board[two]?.status)
+    }
+
+    @Test
+    fun `non-task payload leaves the board unchanged`() {
+        val one = TaskId("auth-1")
+        val withTask = fold(stored(created(one), 1))
+
+        val nonTask = RefinementIterationEvent(
+            sessionId = SessionId("s-1"),
+            cycleKey = "implement->review",
+            iteration = 1,
+            maxIterations = 3,
+        )
+        val after = projector.apply(withTask, stored(nonTask, 2))
+
+        assertEquals(withTask, after)
+    }
+}

core/tasks/src/test/kotlin/com/correx/core/tasks/TaskContextAssemblerTest.kt

@@ -0,0 +1,128 @@
+package com.correx.core.tasks
+
+import com.correx.core.events.types.ProjectId
+import com.correx.core.events.types.TaskId
+import com.correx.core.events.types.TaskLinkType
+import com.correx.core.events.types.TaskNoteAuthor
+import com.correx.core.events.types.TaskTargetKind
+import kotlinx.coroutines.runBlocking
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertNull
+import org.junit.jupiter.api.Assertions.assertTrue
+import org.junit.jupiter.api.Test
+
+class TaskContextAssemblerTest {
+
+    private val store = InMemoryEventStore()
+    private val service = TaskService(store)
+    private val assembler = TaskContextAssembler(service)
+    private val project = ProjectId("auth")
+
+    @Test
+    fun `bundle resolves linked tasks as dependencies and keeps non-task links raw`() = runBlocking {
+        val dep = service.createTask(project, "Design auth model", "model")
+        service.claim(dep.taskId, "claude-opus")
+        service.submitForReview(dep.taskId)
+        service.complete(dep.taskId) // dep is DONE
+
+        val task = service.createTask(
+            project,
+            title = "Implement JWT refresh",
+            goal = "users stay authenticated",
+            acceptanceCriteria = listOf("refresh endpoint exists"),
+            affectedPaths = listOf("backend/auth/**"),
+        )
+        service.link(task.taskId, dep.taskId.value, TaskLinkType.DEPENDS_ON, TaskTargetKind.TASK)
+        // DOC-tagged, but this assembler has no document resolver → stays a raw related link
+        service.link(task.taskId, "adr-7", TaskLinkType.IMPLEMENTS, TaskTargetKind.DOC)
+        service.addNote(task.taskId, TaskNoteAuthor.AGENT, "kickoff")
+
+        val bundle = assembler.assemble(task.taskId)!!
+
+        assertEquals("auth-2", bundle.id)
+        assertEquals("users stay authenticated", bundle.goal)
+        assertEquals(listOf("refresh endpoint exists"), bundle.acceptanceCriteria)
+        assertEquals(listOf("backend/auth/**"), bundle.relevantFiles)
+
+        val dependency = bundle.dependencies.single()
+        assertEquals("auth-1", dependency.id)
+        assertEquals("DONE", dependency.status)
+        assertEquals("DEPENDS_ON", dependency.link)
+
+        assertEquals(RelatedLink("adr-7", "IMPLEMENTS"), bundle.relatedLinks.single())
+        assertEquals("kickoff", bundle.notes.single().body)
+    }
+
+    @Test
+    fun `render produces a compact labelled bundle`() = runBlocking {
+        val task = service.createTask(project, "JWT refresh", "stay authed", listOf("rotates"))
+        val text = assembler.assemble(task.taskId)!!.render()
+
+        assertTrue(text.startsWith("task auth-1 [TODO] JWT refresh"))
+        assertTrue(text.contains("goal: stay authed"))
+        assertTrue(text.contains("- rotates"))
+    }
+
+    @Test
+    fun `assemble returns null for an unknown task`() = runBlocking {
+        assertNull(assembler.assemble(TaskId("auth-999")))
+    }
+
+    @Test
+    fun `bundle is enriched with knowledge retrieved over the goal`() = runBlocking {
+        val captured = mutableListOf<String>()
+        val fakeRetriever = object : TaskKnowledgeRetriever {
+            override suspend fun retrieve(query: String, limit: Int): List<KnowledgeHit> {
+                captured += query
+                return listOf(KnowledgeHit("backend/auth/Jwt.kt", "fun refresh(token)", 0.91))
+            }
+        }
+        val enriched = TaskContextAssembler(service, fakeRetriever)
+        val task = service.createTask(project, "JWT refresh", "users stay authenticated")
+
+        val bundle = enriched.assemble(task.taskId)!!
+
+        assertEquals(listOf("JWT refresh users stay authenticated"), captured)
+        assertEquals("backend/auth/Jwt.kt", bundle.relevantKnowledge.single().source)
+        assertTrue(bundle.render().contains("relevant_knowledge"))
+    }
+
+    @Test
+    fun `linked docs are resolved inline and dropped from raw related links`() = runBlocking {
+        val docs = object : TaskDocumentResolver {
+            override suspend fun resolve(targetId: String): ResolvedDocument? =
+                if (targetId == "adr-7") {
+                    ResolvedDocument("ADR 7: use redis", "docs/decisions/adr-0007-redis.md", "faster invalidation")
+                } else {
+                    null
+                }
+        }
+        val enriched = TaskContextAssembler(service, documentResolver = docs)
+        val task = service.createTask(project, "JWT refresh", "auth")
+        service.link(task.taskId, "adr-7", TaskLinkType.IMPLEMENTS, TaskTargetKind.DOC) // resolves to a doc
+        service.link(task.taskId, "ext-123", TaskLinkType.RELATES_TO, TaskTargetKind.ARTIFACT) // stays raw
+
+        val bundle = enriched.assemble(task.taskId)!!
+
+        val doc = bundle.documents.single()
+        assertEquals("adr-7", doc.targetId)
+        assertEquals("ADR 7: use redis", doc.title)
+        assertEquals("IMPLEMENTS", doc.type)
+        assertEquals(RelatedLink("ext-123", "RELATES_TO"), bundle.relatedLinks.single())
+        assertTrue(bundle.render().contains("documents:"))
+    }
+
+    @Test
+    fun `retrieval failure is swallowed and the bundle still returns`() = runBlocking {
+        val flaky = object : TaskKnowledgeRetriever {
+            override suspend fun retrieve(query: String, limit: Int): List<KnowledgeHit> =
+                error("embedder offline")
+        }
+        val task = service.createTask(project, "JWT refresh", "stay authed")
+
+        val bundle = TaskContextAssembler(service, flaky).assemble(task.taskId)!!
+
+        assertTrue(bundle.relevantKnowledge.isEmpty())
+        assertEquals("JWT refresh", bundle.title)
+    }
+}

core/tasks/src/test/kotlin/com/correx/core/tasks/TaskCounterProjectionTest.kt

@@ -0,0 +1,51 @@
+package com.correx.core.tasks
+
+import com.correx.core.events.events.EventMetadata
+import com.correx.core.events.events.EventPayload
+import com.correx.core.events.events.StoredEvent
+import com.correx.core.events.events.TaskCancelledEvent
+import com.correx.core.events.events.TaskCreatedEvent
+import com.correx.core.events.types.EventId
+import com.correx.core.events.types.ProjectId
+import com.correx.core.events.types.SessionId
+import com.correx.core.events.types.TaskId
+import kotlinx.datetime.Instant
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Test
+
+class TaskCounterProjectionTest {
+
+    private val projection = TaskCounterProjection("auth")
+    private val projectId = ProjectId("auth")
+
+    private fun stored(payload: EventPayload, seq: Long) = StoredEvent(
+        metadata = EventMetadata(
+            eventId = EventId("e-$seq"),
+            sessionId = SessionId("tasks:auth"),
+            timestamp = Instant.parse("2026-01-01T00:00:0${seq}Z"),
+            schemaVersion = 1,
+            causationId = null,
+            correlationId = null,
+        ),
+        sequence = seq,
+        sessionSequence = seq,
+        payload = payload,
+    )
+
+    private fun created(id: TaskId) =
+        TaskCreatedEvent(id, projectId, id.value, "title", "goal")
+
+    @Test
+    fun `counts only created events and survives cancellation`() {
+        val events = listOf(
+            stored(created(TaskId("auth-1")), 1),
+            stored(created(TaskId("auth-2")), 2),
+            stored(TaskCancelledEvent(TaskId("auth-1")), 3),
+        )
+
+        val state = events.fold(projection.initial()) { s, e -> projection.apply(s, e) }
+
+        assertEquals("auth", state.projectId)
+        assertEquals(2, state.count)
+    }
+}

core/tasks/src/test/kotlin/com/correx/core/tasks/TaskServiceTest.kt

@@ -0,0 +1,84 @@
+package com.correx.core.tasks
+
+import com.correx.core.events.types.ProjectId
+import com.correx.core.events.types.TaskId
+import com.correx.core.events.types.TaskLinkType
+import com.correx.core.events.types.TaskNoteAuthor
+import com.correx.core.events.types.TaskTargetKind
+import kotlinx.coroutines.runBlocking
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertFalse
+import org.junit.jupiter.api.Assertions.assertNull
+import org.junit.jupiter.api.Assertions.assertTrue
+import org.junit.jupiter.api.Test
+
+class TaskServiceTest {
+
+    private val store = InMemoryEventStore()
+    private val service = TaskService(store)
+    private val project = ProjectId("auth")
+
+    @Test
+    fun `createTask allocates sequential human keys per project`() = runBlocking {
+        val first = service.createTask(project, "Add JWT refresh", "users stay authenticated")
+        val second = service.createTask(project, "Rotate keys", "tokens rotate")
+
+        assertEquals("auth-1", first.taskId.value)
+        assertEquals("auth-2", second.taskId.value)
+        assertEquals(TaskStatus.TODO, first.state.status)
+        assertEquals("Add JWT refresh", first.state.title)
+    }
+
+    @Test
+    fun `lifecycle round-trips through append and replay`() = runBlocking {
+        val task = service.createTask(project, "Add JWT refresh", "users stay authenticated")
+        val id = task.taskId
+
+        assertEquals(TaskStatus.IN_PROGRESS, service.claim(id, "claude-opus")?.state?.status)
+        assertEquals(TaskStatus.IN_REVIEW, service.submitForReview(id)?.state?.status)
+        val done = service.complete(id)
+
+        assertEquals(TaskStatus.DONE, done?.state?.status)
+        assertEquals("claude-opus", done?.state?.claimant)
+    }
+
+    @Test
+    fun `links and notes are persisted on the task`() = runBlocking {
+        val id = service.createTask(project, "Add JWT refresh", "auth").taskId
+
+        service.link(id, targetId = "adr-7", type = TaskLinkType.IMPLEMENTS, targetKind = TaskTargetKind.DOC)
+        val withNote = service.addNote(id, TaskNoteAuthor.AGENT, "migration failed, retrying")
+
+        assertEquals(
+            TaskLink("adr-7", TaskLinkType.IMPLEMENTS, TaskTargetKind.DOC),
+            withNote?.state?.links?.single(),
+        )
+        assertEquals("migration failed, retrying", withNote?.state?.notes?.single()?.body)
+    }
+
+    @Test
+    fun `delete is a soft tombstone hidden from reads`() = runBlocking {
+        val id = service.createTask(project, "throwaway", "oops").taskId
+
+        assertTrue(service.delete(id))
+        assertNull(service.getTask(id))
+        assertTrue(service.list(project).none { it.taskId == id })
+        // A second delete is a no-op: the task is already gone from reads.
+        assertFalse(service.delete(id))
+    }
+
+    @Test
+    fun `mutating an unknown task returns null`() = runBlocking {
+        assertNull(service.claim(TaskId("auth-999"), "claude-opus"))
+    }
+
+    @Test
+    fun `keys keep incrementing even after deletion`() = runBlocking {
+        val first = service.createTask(project, "one", "g").taskId
+        service.delete(first)
+        val third = service.createTask(project, "two", "g")
+
+        // count() is creation-based, so the deleted id is never reused.
+        assertEquals("auth-2", third.taskId.value)
+    }
+}

docs/decisions/adr-0012-task-tracking.md

@@ -0,0 +1,112 @@
+---
+name: "Adr 0012 Task Tracking"
+description: "Native task tracking as an event-sourced aggregate; tasks are a first-class work-graph node"
+depth: 2
+links: ["../index.md", "./adr-0001-event-sourcing.md", "./adr-0005-persistence-choice.md", "./adr-0006-event-store-append-only.md"]
+---
+
+# ADR 0012: native task tracking as an event-sourced aggregate
+
+**status:** accepted
+**date:** 23.06.2026 (June)
+**deciders:** correx design team
+
+---
+
+## context
+
+Correx is to gain **native task tracking** — a durable "task" (work item / issue) entity,
+agent-first. Today the system has no concept of a task; it has `sessions` (agent runs) and
+session/stage-scoped `artifacts`. A task is conceptually different: a durable unit of intent
+that outlives any single session and *references* the artifacts and sessions that act on it.
+
+An originating pitch proposed storing tasks as YAML/markdown files as the **source of truth**
+with Postgres as a cache, plus a `GET /tasks/next` assignment scheduler. Those technical
+choices are **rejected** here: they contradict correx's foundational invariants —
+"the event log is the only source of truth; projections are disposable and rebuilt from
+events" (`.correx/project.toml`, ADR-0001, ADR-0006). Adopting hand-edited files as truth
+would create two masters (files vs. log) and forfeit replay/idempotency. We keep the *goal*
+(native tasks) and realise it with correx's actual architecture.
+
+This ADR covers the **foundational slice**: the aggregate, its events, and the work-graph
+edge model. REST/CLI/agent-context-bundle/search are deliberately later phases.
+
+## decision
+
+**A task is a first-class event-sourced aggregate**, modelled on the existing `core:sessions`
+aggregate (Status / State / Reducer / Projector / Repository / Counter), living in a new
+`core:tasks` module. It is *not* an `ArtifactKind` — artifacts are session/stage-scoped LLM
+outputs; a task is durable and cross-session.
+
+### 1. event log is the source of truth
+Tasks are rebuilt by folding events. Any future markdown/file representation is a *disposable
+projection* (export), never the master copy.
+
+### 2. per-project task stream
+The `EventStore` is partitioned by `sessionId`. Since `SessionId` and `TaskId` are both
+`TypeId`, all task events for a project live in one stream keyed `tasks:<projectId>`
+(`TaskStreams.forProject`). One read rebuilds the whole board (`TaskBoard = Map<TaskId,
+TaskState>`). The `tasks:` prefix keeps these streams distinguishable from real agent
+sessions; when task streams are later wired into the live server, session-listing consumers
+filter the prefix.
+
+### 3. lifecycle as facts; status is derived
+Mirroring sessions (whose events never carry `SessionStatus`), task events are facts
+(`TaskClaimed`, `TaskBlocked`, `TaskCompleted`, …) and `DefaultTaskReducer` derives
+`TaskStatus`. This keeps the `TaskStatus` enum out of the lowest module (`core:events`). A
+`sealed interface TaskEvent { val taskId }` (a marker, *not* part of the serialized
+`EventPayload` hierarchy) lets projections route any payload to its task without a giant `when`.
+
+### 4. status workflow
+`TODO → IN_PROGRESS → IN_REVIEW → DONE`, with `BLOCKED` (reversible; unblock returns to
+IN_PROGRESS if claimed, else TODO) and `CANCELLED` (terminal, reopenable). Illegal
+transitions are ignored and counted in `TaskState.invalidTransitions` (as `SessionState` does).
+
+### 5. work-graph edges
+`TaskLinkType` (sibling to the existing `ArtifactRelationshipType`):
+`DEPENDS_ON, BLOCKS, IMPLEMENTS, RELATES_TO, PRODUCED, CONTEXT`. A link target is a plain id
+string — another task, an `ArtifactId`, or a `SessionId` — plus a type. This is the work-graph
+backbone the agent-context bundle (later phase) will traverse.
+
+### 6. human-friendly ids
+`TaskCounterProjection(projectId)` counts `TaskCreatedEvent`s in the project stream; the
+numeric suffix of a key (`<prefix>-<n>`, e.g. `auth-142`) is the count of *created* tasks, so
+ids never collide even after cancellation. The creating caller composes the key and stores it
+in `TaskCreatedEvent.key`. (The creating service is a later phase; the projection and `key`
+field land now.)
+
+## consequences
+
+**positive:**
+
+* reuses the entire event-sourcing backbone (sequencing, idempotency, replay, projections);
+  no new persistence model, no second source of truth
+* the work graph (tasks ↔ tasks/artifacts/sessions) is native, enabling later
+  "everything touching X" queries and the agent-context bundle
+* deterministic, replayable task state; status derivation is unit-testable in isolation
+
+**negative:**
+
+* overloading the `sessionId`-partitioned stream key with `tasks:<projectId>` means
+  session-enumerating consumers must learn to filter the prefix once tasks go live
+  (acceptable; isolated to the live-wiring phase)
+* per-project (not per-task) stream means rebuilding one task replays the project's task
+  events — fine at expected volumes; revisit with snapshots if a project's task log grows large
+
+## alternatives considered
+
+* **Task as an `ArtifactKind`:** rejected — artifacts are session/stage-scoped outputs;
+  tasks are durable, cross-session, and carry their own lifecycle/claiming.
+* **YAML/markdown files as source of truth + Postgres cache (the pitch):** rejected —
+  violates ADR-0001/0006; creates two masters and loses replay/idempotency.
+* **`GET /tasks/next` assignment scheduler (the pitch):** dropped — scheduling/prioritisation
+  is a separate hard problem; v1 offers `claim` (pull), not `assign` (push).
+* **One stream per task:** cleaner per-task sequencing but pollutes session enumeration with
+  one stream per task and makes board/list queries fan out across many streams; the
+  per-project stream is the better default for a tracker that lists/boards constantly.
+
+## status
+
+Governs the foundational task-tracking slice. Re-evaluation expected when the REST surface,
+the `GET /tasks/{id}/context` agent bundle, search, and git-driven auto status updates are
+designed (those phases build on, and must not contradict, this ADR).

infrastructure/src/main/kotlin/com/correx/infrastructure/InfrastructureModule.kt

@@ -35,6 +35,7 @@ import com.correx.core.router.model.RouterConfig
 import com.correx.core.router.model.WorkflowSummary
 import com.correx.core.events.types.SessionId
 import com.correx.core.sessions.projections.replay.DefaultEventReplayer
+import com.correx.core.tools.contract.Tool
 import com.correx.core.tools.contract.ToolExecutor
 import com.correx.core.tools.registry.ToolRegistry
 import com.correx.infrastructure.artifactscas.CasArtifactStore
@@ -104,8 +105,11 @@ object InfrastructureModule {
         return runBlocking { CasArtifactStore.open(CasConfig(rootDir), index) }
     }
 
-    fun createToolRegistry(config: ToolConfig): ToolRegistry =
-        DefaultToolRegistry.build(config.buildTools())
+    fun createToolRegistry(
+        config: ToolConfig,
+        extraTools: List<Tool> = emptyList(),
+    ): ToolRegistry =
+        DefaultToolRegistry.build(config.buildTools() + extraTools)
 
     fun createLlamaCppProvider(
         modelId: String,

infrastructure/tools/build.gradle

@@ -13,6 +13,7 @@ dependencies {
     implementation project(":core:events")
     implementation project(":core:approvals")
     implementation project(":core:sessions")
+    implementation project(":core:tasks")
     implementation project(":infrastructure:tools:filesystem")
     implementation project(":core:artifacts")
     implementation project(":core:artifacts-store")

infrastructure/tools/src/main/kotlin/com/correx/infrastructure/tools/task/TaskContextTool.kt

@@ -0,0 +1,56 @@
+package com.correx.infrastructure.tools.task
+
+import com.correx.core.approvals.Tier
+import com.correx.core.events.events.ToolRequest
+import com.correx.core.events.types.TaskId
+import com.correx.core.tasks.TaskContextAssembler
+import com.correx.core.tools.contract.Tool
+import com.correx.core.tools.contract.ToolCapability
+import com.correx.core.tools.contract.ToolExecutor
+import com.correx.core.tools.contract.ToolResult
+import com.correx.core.tools.contract.ValidationResult
+import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.json.JsonPrimitive
+import kotlinx.serialization.json.add
+import kotlinx.serialization.json.buildJsonArray
+import kotlinx.serialization.json.buildJsonObject
+import kotlinx.serialization.json.put
+import kotlinx.serialization.json.putJsonObject
+
+/**
+ * Agent-facing tool: fetch a task's token-optimized context bundle in one call. Read-only, so
+ * it sits at the lowest tier (like file_read) — agents call it before starting work on a task.
+ */
+class TaskContextTool(private val assembler: TaskContextAssembler) : Tool, ToolExecutor {
+
+    override val name: String = "task_context"
+    override val description: String =
+        "Fetch a task's context bundle (goal, acceptance criteria, resolved dependencies, " +
+            "related links, relevant files, notes) in one call. Use before working a task."
+    override val parametersSchema: JsonObject = buildJsonObject {
+        put("type", "object")
+        putJsonObject("properties") {
+            putJsonObject("id") { put("type", "string"); put("description", "Task id, e.g. 'auth-142'.") }
+        }
+        put("required", buildJsonArray { add(JsonPrimitive("id")) })
+    }
+    override val tier: Tier = Tier.T1
+    override val requiredCapabilities: Set<ToolCapability> = emptySet()
+
+    override fun validateRequest(request: ToolRequest): ValidationResult {
+        request.stringParam("id") ?: return ValidationResult.Invalid("Missing 'id' (string).")
+        return ValidationResult.Valid
+    }
+
+    override suspend fun execute(request: ToolRequest): ToolResult {
+        val id = request.stringParam("id")
+            ?: return ToolResult.Failure(request.invocationId, "Missing 'id' (string).", recoverable = false)
+        val bundle = assembler.assemble(TaskId(id))
+            ?: return ToolResult.Failure(request.invocationId, "No such task: $id", recoverable = false)
+        return ToolResult.Success(
+            invocationId = request.invocationId,
+            output = bundle.render(),
+            metadata = mapOf("taskId" to id, "status" to bundle.status),
+        )
+    }
+}

infrastructure/tools/src/main/kotlin/com/correx/infrastructure/tools/task/TaskCreateTool.kt

@@ -0,0 +1,89 @@
+package com.correx.infrastructure.tools.task
+
+import com.correx.core.approvals.Tier
+import com.correx.core.events.events.ToolRequest
+import com.correx.core.events.types.ProjectId
+import com.correx.core.tasks.TaskService
+import com.correx.core.tools.contract.Tool
+import com.correx.core.tools.contract.ToolCapability
+import com.correx.core.tools.contract.ToolExecutor
+import com.correx.core.tools.contract.ToolResult
+import com.correx.core.tools.contract.ValidationResult
+import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.json.JsonPrimitive
+import kotlinx.serialization.json.add
+import kotlinx.serialization.json.buildJsonArray
+import kotlinx.serialization.json.buildJsonObject
+import kotlinx.serialization.json.put
+import kotlinx.serialization.json.putJsonObject
+
+/** Agent-facing tool: create a task in a project's work graph. */
+class TaskCreateTool(private val service: TaskService) : Tool, ToolExecutor {
+
+    override val name: String = "task_create"
+    override val description: String =
+        "Create a task in a project's work graph and return its id (e.g. 'auth-142')."
+    override val parametersSchema: JsonObject = buildJsonObject {
+        put("type", "object")
+        putJsonObject("properties") {
+            putJsonObject("project") {
+                put("type", "string")
+                put("description", "Project key, e.g. 'auth'. The new task id is '<project>-<n>'.")
+            }
+            putJsonObject("title") {
+                put("type", "string")
+                put("description", "Short imperative title.")
+            }
+            putJsonObject("goal") {
+                put("type", "string")
+                put("description", "What 'done' looks like, in a sentence or two.")
+            }
+            putJsonObject("acceptance_criteria") {
+                put("type", "array")
+                putJsonObject("items") { put("type", "string") }
+                put("description", "Concrete, verifiable criteria.")
+            }
+            putJsonObject("affected_paths") {
+                put("type", "array")
+                putJsonObject("items") { put("type", "string") }
+                put("description", "Globs/paths this task is expected to touch.")
+            }
+        }
+        put(
+            "required",
+            buildJsonArray {
+                add(JsonPrimitive("project"))
+                add(JsonPrimitive("title"))
+                add(JsonPrimitive("goal"))
+            },
+        )
+    }
+    override val tier: Tier = Tier.T2
+    override val requiredCapabilities: Set<ToolCapability> = emptySet()
+
+    override fun validateRequest(request: ToolRequest): ValidationResult {
+        request.stringParam("project") ?: return ValidationResult.Invalid("Missing 'project' (string).")
+        request.stringParam("title") ?: return ValidationResult.Invalid("Missing 'title' (string).")
+        request.stringParam("goal") ?: return ValidationResult.Invalid("Missing 'goal' (string).")
+        return ValidationResult.Valid
+    }
+
+    override suspend fun execute(request: ToolRequest): ToolResult {
+        val invalid = validateRequest(request) as? ValidationResult.Invalid
+        if (invalid != null) {
+            return ToolResult.Failure(request.invocationId, invalid.reason, recoverable = false)
+        }
+        val task = service.createTask(
+            projectId = ProjectId(request.stringParam("project")!!),
+            title = request.stringParam("title")!!,
+            goal = request.stringParam("goal")!!,
+            acceptanceCriteria = request.listParam("acceptance_criteria"),
+            affectedPaths = request.listParam("affected_paths"),
+        )
+        return ToolResult.Success(
+            invocationId = request.invocationId,
+            output = "Created ${task.taskId.value}: ${task.state.title}",
+            metadata = mapOf("taskId" to task.taskId.value, "status" to task.state.status.name),
+        )
+    }
+}

infrastructure/tools/src/main/kotlin/com/correx/infrastructure/tools/task/TaskDeleteTool.kt

@@ -0,0 +1,55 @@
+package com.correx.infrastructure.tools.task
+
+import com.correx.core.approvals.Tier
+import com.correx.core.events.events.ToolRequest
+import com.correx.core.events.types.TaskId
+import com.correx.core.tasks.TaskService
+import com.correx.core.tools.contract.Tool
+import com.correx.core.tools.contract.ToolCapability
+import com.correx.core.tools.contract.ToolExecutor
+import com.correx.core.tools.contract.ToolResult
+import com.correx.core.tools.contract.ValidationResult
+import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.json.JsonPrimitive
+import kotlinx.serialization.json.add
+import kotlinx.serialization.json.buildJsonArray
+import kotlinx.serialization.json.buildJsonObject
+import kotlinx.serialization.json.put
+import kotlinx.serialization.json.putJsonObject
+
+/**
+ * Agent-facing tool: soft-delete a task (tombstone). History is preserved in the event log;
+ * the task drops out of active views. Use 'task_update' with action=cancel to record an
+ * abandoned-but-visible outcome instead.
+ */
+class TaskDeleteTool(private val service: TaskService) : Tool, ToolExecutor {
+
+    override val name: String = "task_delete"
+    override val description: String =
+        "Soft-delete a task (removes it from active views; history is kept). " +
+            "For an abandoned-but-visible task, use task_update action=cancel instead."
+    override val parametersSchema: JsonObject = buildJsonObject {
+        put("type", "object")
+        putJsonObject("properties") {
+            putJsonObject("id") { put("type", "string"); put("description", "Task id, e.g. 'auth-142'.") }
+        }
+        put("required", buildJsonArray { add(JsonPrimitive("id")) })
+    }
+    override val tier: Tier = Tier.T2
+    override val requiredCapabilities: Set<ToolCapability> = emptySet()
+
+    override fun validateRequest(request: ToolRequest): ValidationResult {
+        request.stringParam("id") ?: return ValidationResult.Invalid("Missing 'id' (string).")
+        return ValidationResult.Valid
+    }
+
+    override suspend fun execute(request: ToolRequest): ToolResult {
+        val id = request.stringParam("id")
+            ?: return ToolResult.Failure(request.invocationId, "Missing 'id' (string).", recoverable = false)
+        return if (service.delete(TaskId(id))) {
+            ToolResult.Success(request.invocationId, output = "Deleted $id", metadata = mapOf("taskId" to id))
+        } else {
+            ToolResult.Failure(request.invocationId, "No such task: $id", recoverable = false)
+        }
+    }
+}

infrastructure/tools/src/main/kotlin/com/correx/infrastructure/tools/task/TaskTools.kt

@@ -0,0 +1,26 @@
+package com.correx.infrastructure.tools.task
+
+import com.correx.core.tasks.TaskContextAssembler
+import com.correx.core.tasks.TaskDocumentResolver
+import com.correx.core.tasks.TaskKnowledgeRetriever
+import com.correx.core.tasks.TaskService
+import com.correx.core.tools.contract.Tool
+
+/** Builds the task tool set over a single [TaskService] for registration in the tool registry. */
+object TaskTools {
+    /**
+     * [retriever] semantically enriches the `task_context` bundle; [documentResolver] inlines
+     * linked ADRs/docs. Both optional — null leaves the bundle deterministic.
+     */
+    fun forService(
+        service: TaskService,
+        retriever: TaskKnowledgeRetriever? = null,
+        documentResolver: TaskDocumentResolver? = null,
+    ): List<Tool> =
+        listOf(
+            TaskCreateTool(service),
+            TaskUpdateTool(service),
+            TaskDeleteTool(service),
+            TaskContextTool(TaskContextAssembler(service, retriever, documentResolver)),
+        )
+}

infrastructure/tools/src/main/kotlin/com/correx/infrastructure/tools/task/TaskUpdateTool.kt

@@ -0,0 +1,158 @@
+package com.correx.infrastructure.tools.task
+
+import com.correx.core.approvals.Tier
+import com.correx.core.events.events.ToolRequest
+import com.correx.core.events.types.TaskId
+import com.correx.core.events.types.TaskLinkType
+import com.correx.core.events.types.TaskNoteAuthor
+import com.correx.core.events.types.TaskTargetKind
+import com.correx.core.tasks.TaskService
+import com.correx.core.tools.contract.Tool
+import com.correx.core.tools.contract.ToolCapability
+import com.correx.core.tools.contract.ToolExecutor
+import com.correx.core.tools.contract.ToolResult
+import com.correx.core.tools.contract.ValidationResult
+import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.json.JsonPrimitive
+import kotlinx.serialization.json.add
+import kotlinx.serialization.json.buildJsonArray
+import kotlinx.serialization.json.buildJsonObject
+import kotlinx.serialization.json.put
+import kotlinx.serialization.json.putJsonObject
+
+private val ADR_ID = Regex("(?i)^adr[-_ ]?\\d+$")
+
+/**
+ * Agent-facing tool: update an existing task — edit fields, transition status, add a work-graph
+ * link, or attach a note. The task's project is derived from its id, so only the id is required.
+ */
+class TaskUpdateTool(private val service: TaskService) : Tool, ToolExecutor {
+
+    override val name: String = "task_update"
+    override val description: String =
+        "Update a task: edit title/goal/criteria/paths, change status via 'action' " +
+            "(claim, release, block, unblock, submit_for_review, complete, reopen, cancel), " +
+            "add a link, or add a note."
+    override val parametersSchema: JsonObject = buildJsonObject {
+        put("type", "object")
+        putJsonObject("properties") {
+            putJsonObject("id") { put("type", "string"); put("description", "Task id, e.g. 'auth-142'.") }
+            putJsonObject("title") { put("type", "string"); put("description", "New title.") }
+            putJsonObject("goal") { put("type", "string"); put("description", "New goal.") }
+            putJsonObject("acceptance_criteria") {
+                put("type", "array")
+                putJsonObject("items") { put("type", "string") }
+                put("description", "Replaces the acceptance criteria.")
+            }
+            putJsonObject("affected_paths") {
+                put("type", "array")
+                putJsonObject("items") { put("type", "string") }
+                put("description", "Replaces the affected paths.")
+            }
+            putJsonObject("action") {
+                put("type", "string")
+                put(
+                    "description",
+                    "Status transition: claim, release, block, unblock, submit_for_review, " +
+                        "complete, reopen, cancel.",
+                )
+            }
+            putJsonObject("claimant") { put("type", "string"); put("description", "Who claims it (for action=claim).") }
+            putJsonObject("reason") { put("type", "string"); put("description", "Reason (for action=block/cancel).") }
+            putJsonObject("link_target") { put("type", "string"); put("description", "Id to link to (task/artifact/session).") }
+            putJsonObject("link_type") {
+                put("type", "string")
+                put("description", "DEPENDS_ON, BLOCKS, IMPLEMENTS, RELATES_TO, PRODUCED, CONTEXT. Default RELATES_TO.")
+            }
+            putJsonObject("link_kind") {
+                put("type", "string")
+                put("description", "What the link points at: TASK, DOC, ARTIFACT, SESSION. Omit to infer from the target id.")
+            }
+            putJsonObject("note") { put("type", "string"); put("description", "Append an agent note.") }
+        }
+        put("required", buildJsonArray { add(JsonPrimitive("id")) })
+    }
+    override val tier: Tier = Tier.T2
+    override val requiredCapabilities: Set<ToolCapability> = emptySet()
+
+    override fun validateRequest(request: ToolRequest): ValidationResult {
+        request.stringParam("id") ?: return ValidationResult.Invalid("Missing 'id' (string).")
+        return ValidationResult.Valid
+    }
+
+    override suspend fun execute(request: ToolRequest): ToolResult {
+        val id = request.stringParam("id")
+            ?: return fail(request, "Missing 'id' (string).")
+        val taskId = TaskId(id)
+        if (service.getTask(taskId) == null) return fail(request, "No such task: $id")
+
+        applyFieldEdits(request, taskId)
+
+        val action = request.stringParam("action")
+        if (action != null && !applyAction(taskId, action, request)) {
+            return fail(request, "Unknown action '$action'.")
+        }
+
+        val linkTarget = request.stringParam("link_target")
+        if (linkTarget != null) {
+            val type = parseLinkType(request.stringParam("link_type"))
+                ?: return fail(request, "Invalid 'link_type'.")
+            val kind = resolveTargetKind(request.stringParam("link_kind"), linkTarget)
+                ?: return fail(request, "Invalid 'link_kind'.")
+            service.link(taskId, linkTarget, type, kind)
+        }
+
+        request.stringParam("note")?.let { service.addNote(taskId, TaskNoteAuthor.AGENT, it) }
+
+        val status = service.getTask(taskId)?.state?.status?.name ?: "UNKNOWN"
+        return ToolResult.Success(
+            invocationId = request.invocationId,
+            output = "Updated $id [$status]",
+            metadata = mapOf("taskId" to id, "status" to status),
+        )
+    }
+
+    private suspend fun applyFieldEdits(request: ToolRequest, taskId: TaskId) {
+        val title = request.stringParam("title")
+        val goal = request.stringParam("goal")
+        if (title != null || goal != null) service.edit(taskId, title, goal)
+        if (request.parameters.containsKey("acceptance_criteria")) {
+            service.setAcceptanceCriteria(taskId, request.listParam("acceptance_criteria"))
+        }
+        if (request.parameters.containsKey("affected_paths")) {
+            service.setAffectedPaths(taskId, request.listParam("affected_paths"))
+        }
+    }
+
+    private suspend fun applyAction(taskId: TaskId, action: String, request: ToolRequest): Boolean {
+        val claimant = request.stringParam("claimant") ?: request.sessionId.value
+        val reason = request.stringParam("reason")
+        when (action) {
+            "claim" -> service.claim(taskId, claimant)
+            "release" -> service.release(taskId)
+            "block" -> service.block(taskId, reason ?: "blocked")
+            "unblock" -> service.unblock(taskId)
+            "submit_for_review" -> service.submitForReview(taskId)
+            "complete" -> service.complete(taskId)
+            "reopen" -> service.reopen(taskId)
+            "cancel" -> service.cancel(taskId, reason)
+            else -> return false
+        }
+        return true
+    }
+
+    private fun parseLinkType(raw: String?): TaskLinkType? =
+        if (raw == null) TaskLinkType.RELATES_TO
+        else TaskLinkType.entries.firstOrNull { it.name == raw.uppercase() }
+
+    /** Explicit kind when given (null if unrecognised); otherwise inferred from the target id. */
+    private fun resolveTargetKind(raw: String?, target: String): TaskTargetKind? =
+        if (raw != null) TaskTargetKind.entries.firstOrNull { it.name == raw.uppercase() }
+        else inferTargetKind(target)
+
+    private fun inferTargetKind(target: String): TaskTargetKind =
+        if (ADR_ID.matches(target) || target.endsWith(".md")) TaskTargetKind.DOC else TaskTargetKind.TASK
+
+    private fun fail(request: ToolRequest, reason: String): ToolResult.Failure =
+        ToolResult.Failure(request.invocationId, reason, recoverable = false)
+}

infrastructure/tools/src/main/kotlin/com/correx/infrastructure/tools/task/ToolParams.kt

@@ -0,0 +1,11 @@
+package com.correx.infrastructure.tools.task
+
+import com.correx.core.events.events.ToolRequest
+
+/** A non-blank string parameter, or null when absent/blank/not a string. */
+internal fun ToolRequest.stringParam(name: String): String? =
+    (parameters[name] as? String)?.takeIf { it.isNotBlank() }
+
+/** A string-list parameter (JSON array), coerced element-wise; empty when absent. */
+internal fun ToolRequest.listParam(name: String): List<String> =
+    (parameters[name] as? List<*>)?.mapNotNull { it?.toString()?.takeIf(String::isNotBlank) } ?: emptyList()

infrastructure/tools/src/test/kotlin/com/correx/infrastructure/tools/task/TaskToolsTest.kt

@@ -0,0 +1,168 @@
+package com.correx.infrastructure.tools.task
+
+import com.correx.core.events.events.NewEvent
+import com.correx.core.events.events.StoredEvent
+import com.correx.core.events.events.ToolRequest
+import com.correx.core.events.stores.EventStore
+import com.correx.core.events.types.SessionId
+import com.correx.core.events.types.StageId
+import com.correx.core.events.types.ToolInvocationId
+import com.correx.core.tasks.TaskContextAssembler
+import com.correx.core.tasks.TaskService
+import com.correx.core.tasks.TaskStatus
+import com.correx.core.tools.contract.ToolResult
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.emptyFlow
+import kotlinx.coroutines.runBlocking
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertNull
+import org.junit.jupiter.api.Assertions.assertTrue
+import org.junit.jupiter.api.Test
+
+class TaskToolsTest {
+
+    private val service = TaskService(InMemoryEventStore())
+    private val create = TaskCreateTool(service)
+    private val update = TaskUpdateTool(service)
+    private val delete = TaskDeleteTool(service)
+    private val context = TaskContextTool(TaskContextAssembler(service))
+
+    private var counter = 0
+    private fun request(tool: String, params: Map<String, Any>) = ToolRequest(
+        invocationId = ToolInvocationId("inv-${counter++}"),
+        sessionId = SessionId("s-1"),
+        stageId = StageId("stage-1"),
+        toolName = tool,
+        parameters = params,
+    )
+
+    private suspend fun createTask(): String {
+        val result = create.execute(
+            request("task_create", mapOf("project" to "auth", "title" to "JWT refresh", "goal" to "stay authed")),
+        )
+        assertTrue(result is ToolResult.Success)
+        return (result as ToolResult.Success).metadata.getValue("taskId")
+    }
+
+    @Test
+    fun `task_create creates a task and returns its id`() = runBlocking {
+        val id = createTask()
+        assertEquals("auth-1", id)
+        assertEquals(TaskStatus.TODO, service.getTask(com.correx.core.events.types.TaskId(id))?.state?.status)
+    }
+
+    @Test
+    fun `task_create rejects missing required fields`() = runBlocking {
+        val result = create.execute(request("task_create", mapOf("project" to "auth")))
+        assertTrue(result is ToolResult.Failure)
+    }
+
+    @Test
+    fun `task_update applies status action, edits, link and note`() = runBlocking {
+        val id = createTask()
+        val taskId = com.correx.core.events.types.TaskId(id)
+
+        val result = update.execute(
+            request(
+                "task_update",
+                mapOf(
+                    "id" to id,
+                    "action" to "claim",
+                    "claimant" to "claude-opus",
+                    "title" to "JWT refresh flow",
+                    "link_target" to "adr-7",
+                    "link_type" to "implements",
+                    "note" to "starting",
+                ),
+            ),
+        )
+
+        assertTrue(result is ToolResult.Success)
+        val state = service.getTask(taskId)!!.state
+        assertEquals(TaskStatus.IN_PROGRESS, state.status)
+        assertEquals("claude-opus", state.claimant)
+        assertEquals("JWT refresh flow", state.title)
+        assertEquals("adr-7", state.links.single().targetId)
+        assertEquals("starting", state.notes.single().body)
+    }
+
+    @Test
+    fun `task_update rejects an unknown action`() = runBlocking {
+        val id = createTask()
+        val result = update.execute(request("task_update", mapOf("id" to id, "action" to "frobnicate")))
+        assertTrue(result is ToolResult.Failure)
+    }
+
+    @Test
+    fun `task_update on a missing task fails`() = runBlocking {
+        val result = update.execute(request("task_update", mapOf("id" to "auth-999", "title" to "x")))
+        assertTrue(result is ToolResult.Failure)
+    }
+
+    @Test
+    fun `task_context returns a rendered bundle with dependencies`() = runBlocking {
+        val id = createTask()
+        update.execute(
+            request("task_update", mapOf("id" to id, "link_target" to "adr-7", "link_type" to "implements")),
+        )
+
+        val result = context.execute(request("task_context", mapOf("id" to id)))
+
+        assertTrue(result is ToolResult.Success)
+        val output = (result as ToolResult.Success).output
+        assertTrue(output.startsWith("task $id [TODO]"))
+        assertTrue(output.contains("adr-7 (IMPLEMENTS)"))
+    }
+
+    @Test
+    fun `task_context on a missing task fails`() = runBlocking {
+        assertTrue(context.execute(request("task_context", mapOf("id" to "auth-999"))) is ToolResult.Failure)
+    }
+
+    @Test
+    fun `task_delete tombstones the task`() = runBlocking {
+        val id = createTask()
+        val deleted = delete.execute(request("task_delete", mapOf("id" to id)))
+
+        assertTrue(deleted is ToolResult.Success)
+        assertNull(service.getTask(com.correx.core.events.types.TaskId(id)))
+        // Deleting again now fails: it is gone from active views.
+        assertTrue(delete.execute(request("task_delete", mapOf("id" to id))) is ToolResult.Failure)
+    }
+}
+
+/** Minimal append-capable in-memory store for tool tests. */
+private class InMemoryEventStore : EventStore {
+    private val events = mutableListOf<StoredEvent>()
+    private var global = 0L
+    private val perSession = mutableMapOf<SessionId, Long>()
+
+    override suspend fun append(event: NewEvent): StoredEvent {
+        global += 1
+        val seq = (perSession[event.metadata.sessionId] ?: 0L) + 1
+        perSession[event.metadata.sessionId] = seq
+        val stored = StoredEvent(event.metadata, global, seq, event.payload)
+        events += stored
+        return stored
+    }
+
+    override suspend fun appendAll(events: List<NewEvent>): List<StoredEvent> = events.map { append(it) }
+
+    override fun read(sessionId: SessionId): List<StoredEvent> =
+        events.filter { it.metadata.sessionId == sessionId }.sortedBy { it.sessionSequence }
+
+    override fun readFrom(sessionId: SessionId, fromSequence: Long): List<StoredEvent> =
+        read(sessionId).filter { it.sessionSequence >= fromSequence }
+
+    override fun lastSequence(sessionId: SessionId): Long? = read(sessionId).maxOfOrNull { it.sessionSequence }
+
+    override fun subscribe(sessionId: SessionId): Flow<StoredEvent> = emptyFlow()
+
+    override fun subscribeAll(): Flow<StoredEvent> = emptyFlow()
+
+    override suspend fun lastGlobalSequence(): Long = global
+
+    override fun allEvents(): Sequence<StoredEvent> = events.asSequence()
+
+    override fun allSessionIds(): Set<SessionId> = events.map { it.metadata.sessionId }.toSet()
+}

settings.gradle

@@ -23,6 +23,7 @@ include ':core:tools'
 include ':core:toolintent'
 include ':core:router'
 include ':core:sessions'
+include ':core:tasks'
 include ':core:config'
 include ':core:risk'
 include ':core:journal'