Three generic harness fixes from the web-ui postmortem dataset. Nothing here keys
on a language, framework, build tool or task type.
1. Failure attribution. WorkflowFailedEvent carries one primary FailureAttribution
(AGENT | HARNESS | WORKFLOW | ENVIRONMENT | PROVIDER | OPERATOR | UNKNOWN),
defaulted to UNKNOWN so pre-field events replay unchanged. FailureAttributor is
the deterministic reason->layer mapping, used both at emission and when
classifying history, so the baseline and the live metric are one measurement.
Emission sites set it: failWorkflow derives from the reason unless the caller
knows the layer, cancellation is OPERATOR, the server catch-all falls back to
HARNESS, a grounding-rejected plan is AGENT. Multi-cause chains stay on
FailureTicketOpened — no second causal structure.
GET /metrics/failure-attribution (FailureAttributionInspectionService, mirroring
ToolReliabilityInspectionService) reports counts, share, UNKNOWN share, the
preserved reasons and the ticket categories from the same sessions. Read-only:
historical events are classified at READ time and reported as `inferred`, never
written back over an append-only log.
Baseline over the local log, 122 terminal failures: AGENT 51 (41.8%),
OPERATOR 28 (23.0%), WORKFLOW 19 (15.6%), PROVIDER 15 (12.3%), HARNESS 6 (4.9%),
ENVIRONMENT 3 (2.5%), UNKNOWN 0.
2. The `~` guard bug. ToolPath is now the ONE canonical normalization rule
(expand a leading `~`/`~/`, keep absolutes, anchor relatives on the session
working dir). Every filesystem tool, all six plane-2 path rules and the approval
preview resolve through it, so policy and existence checks inspect the path the
tool will operate on. `~/.gradle/init.d/offline.gradle` used to resolve to
`<workspace>/~/.gradle/...`: reported non-existent AND in-workspace, so the
reference gate called a real file a hallucination and the out-of-workspace prompt
never fired. Containment and external-read approval behaviour are unchanged —
the expanded path is simply outside the workspace, where it always belonged.
3. file_copy (#713). A first-class tool with the writer's jail, tier, receipt,
replay and CAS pre/post images; static and binary assets no longer move through
the model's token stream. Needed one generic split: ParamRole.SOURCE_PATH marks a
path a call reads FROM, so containment gates judge both params while write-target
gates (read-before-write, stale-write, write scope, write manifest) judge the
mutated one. ReadBeforeWriteRule exempts any call declaring a SOURCE_PATH: its
content comes from disk, not from memory, and requiring a read of a binary is
unsatisfiable. Existing tools declare no SOURCE_PATH, so their behaviour is
byte-identical.
Tests: ToolPathTest (9), FailureAttributionTest (10), PathNormalizationRuleTest (6),
FileCopyToolTest (10), plus a home-relative FileReadTool read. ./gradlew check green.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
claude
6a8a7b31c1