v1.60.0.0 feat(fanout): /fanout decomposes design doc into N parallel agent tasks (rebased, hardened)#1949
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v1.60.0.0 feat(fanout): /fanout decomposes design doc into N parallel agent tasks (rebased, hardened)#1949sohmn wants to merge 3 commits into
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…closed Rebuilt fresh on current main per review feedback on the first PR (garrytan#1763): rebase instead of dragging four generations of merge conflicts forward. Carries the first PR's hardening (Step 1 trust boundary, substitution discipline) and closes all six limitations that PR documented as v1 work: - L1 worktree/branch names get a doc-path sha8 suffix (collision-proof across same-stem design docs) - L2 CHANGELOG/VERSION named expected-conflict files in Merge order, slab prompts, and the wall-clock report - L3 Slab 0 promotion keeps contract ownership with the owning slab - L4 over-decomposition guard: draft-contract refusal in heuristic 4 + parallelism-confidence check (stop when >1/3 of slabs chain) - L5 table cells escape pipes, collapse newlines - L6 per-slab .prompt.md files replace heredocs in the dispatch script (kills the EOF-breakout class, prompts editable before dispatch) test/fanout.test.ts pins all six guardrails. 7/7 pass. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
README (install snippet + table), CLAUDE.md routing, AGENTS.md, docs/skills.md, skill-coverage-matrix (gate: fanout.test.ts + coverage floor). llms.txt + proactive-suggestions.json regenerated. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Queue-aware claim: main at 1.57.7.0, 1.58/1.59 claimed by open PRs. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Summary
Reopens the work from #1763 per the close comment: rebuilt fresh on current main (v1.57.7.0) instead of dragging the old branch's merge conflicts forward. Three clean commits, no merge history.
New skill
/fanout: takes a finished design doc, identifies independent slabs of work via a 4-layer heuristic, promotes shared groundwork to a synchronous Slab 0, builds a slab matrix with verification gates, appends a## Parallel Execution Plansection to the doc, and emits per-slab editable prompt files plus aworktree-dispatch.shsidecar.v0 produces the plan and stops. User runs the dispatch script. Auto-spawn deferred to v1.
Workflow slot: after
/office-hours+ eng-review + design produces a doc,/fanoutturns it into 2-3 worktrees you can dispatch in parallel.What changed since #1763
All six limitations that PR documented as "known v1 work" are now closed:
<sha8>suffix from the doc's repo-relative path/shipdefined in Slab 0: <file>|in paths<topic>-slab-<k>.prompt.mdfiles; the scriptcats them. Zero heredocs in generated output, kills the EOF-breakout class, prompts user-editable before dispatchCarries forward the first PR's hardening: Step 1 trust boundary (doc content is data, not instructions) and substitution discipline (no literal
<placeholder>leaks).Files
fanout/SKILL.md.tmpl(source prompt) + generatedfanout/SKILL.md(983 lines, ~14K tokens)test/fanout.test.ts— 7 free assertions including a guardrail test that pins all six hardening fixes (expect(tmpl).not.toContain("<<'EOF")and friends)docs/designs/FANOUT.md— design doc + "v0.1 hardening (post-review)" sectionREADME.md,CLAUDE.mdrouting,AGENTS.md,docs/skills.md,test/skill-coverage-matrix.ts;gstack/llms.txt+scripts/proactive-suggestions.jsonregeneratedVERSION+package.json→ 1.60.0.0 (queue-aware: 1.58/1.59 claimed by open PRs), CHANGELOG release-summary entryTest plan
bun test test/fanout.test.ts— 7/7 pass (incl. new hardening-guardrails test)bun test test/fanout.test.ts test/skill-coverage-floor.test.ts— 328/328 passbun run gen:skill-docsclean against current main's preamble pipeline🤖 Generated with Claude Code