The run died on a build gate running the wrong toolchain and burned 43% of its
tool calls on repeats, rejections and failures. Five fixes, each traceable to a
measured cost in docs/audits/2026-08-11-session-954da1a9-postmortem.md.
#705 build gate toolchain scope. The gate is armed session-scoped but read the
toolchain stage-scoped, so a reviewer stage that wrote nothing fell back to the
flat `build` alias and ran ./gradlew assemble on an all-frontend session. It now
falls back to the session's own manifest first. 32.5 min, 33% of that run.
#706 action ledger. L2 keeps ten conversation entries, so a stage past round
five has no memory of what it tried; 29% of tool calls were byte-identical
repeats. One pinned line per call (tool, target, outcome) with repeats collapsed
to a count, ~3k tokens for a whole run.
#709 plan-compile lint for blocked runners. Plans prescribed `npx tailwindcss
init -p`, rejected by the shell denylist at every attempt. Rejected at compile
time now, where the architect can still rewrite the step.
#710 near-greedy sampling on tool-call rounds. temperature 1.0 on argv emitted
`./gradlew_`, `npm_prefix=frontend`, `create_vite@latest`. Prose rounds keep the
operator's sampling.
#712 auto-approve manifest-contained writes. 94 approvals, all APPROVED, no
steering, 19 min. A write inside the declared manifest already proved its
containment by getting past ManifestContainmentRule. DENY mode still denies.
Tests: core:kernel 133, infrastructure:workflow 99, testing:integration 176,
testing:deterministic 79, all green. detekt clean (no new findings).
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013dVqqci5H5b3s6xzv6Lojq
claude
d892587420