fak: Instructions file for Claude Code

CLAUDE.md

Not the human contributor guide. This file is operating instructions for automated contributors working inside the maintainers' shared checkout. Humans want README.md for what fak is and CONTRIBUTING.md for how to contribute; nothing on this page applies to you.

The canonical instructions

The canonical agent instructions for this repo are in AGENTS.md — read it first for build/test/run, the repo map, and the rules.

The six hard rules

The six that will bite you if you skip them:

• Work directly on the trunk (main). Never open a feature branch or new worktree — the trunk guard refuses off-trunk commits (OFF_TRUNK). The one sanctioned exception is a detached per-worker worktree that lands its diff back on main via fak worktree worker prepare|land|reap (build isolation, #1334 / epic #3165): because it is detached (never a branch) and commits only through the serialized land under the worker's lane lease, it is not off-trunk and never trips OFF_TRUNK. Feature branches and any other off-trunk commit stay forbidden. (Details in AGENTS.md.)
• Commit via fak commit --path or fak sweep by explicit path — all commits must be made via fak commit --path <p> -m "<subject> (fak <leaf>)" or fak sweep --apply --lane <lane> -m "<subject>". fak commit locks the lane, stages exactly your paths, provides automatic DCO sign-off (with -s accepted for compatibility), and verifies that no peer files were raced in (PATHSPEC_RACE). End every ship commit's Conventional-Commits subject with a bindable (fak <leaf>) trailer so the dos verify referee can bind it — e.g. fix(gateway): treat same-tick ready as positive (fak gateway). A bare un-stamped subject stays NOT_SHIPPED. The /commit-clean skill mechanizes this rule end to end. WARNING: Raw git commits are strictly an emergency-only fallback, permitted ONLY when the fak binary is unbuilt (git commit -s -m "<subject> (fak <leaf>)" -- <paths>); never use git add -A or uncoordinated raw git commits on the shared multi-session tree. (Full convention in AGENTS.md.)
• Default is to ship green work and sync safely unprompted — do more work by default: pre-flight sync with trunk (fak sync check, fak sync reconcile --apply, or fak sync apply), verify on-device (fak validate --mine <paths>, go test ./internal/<pkg>/...), commit by explicit path (fak commit --path <p> -m "<subject> (fak <leaf>)" or fak sweep --apply --lane <lane> -m "<subject>"), and push unprompted via fak sync push or fak commit --push. "Green" requires shift-left proof: for changes touching executable CLI verbs, gateway adapters, runtime logic, or hardware/compute paths, execute real paths in dogfood, integration tests, or live hardware sub-component runs rather than relying on mock-only or shallow tests. Bias heavily toward testing sub-components on live physical hardware (divide and conquer) with high volume and frequency (e.g. fak validate --strix --subkernels=..., make mac-perf, make cuda-test). Safe merge discipline: verify no in-flight MERGE_HEAD exists before staging (if active, unstage and wait; never clobber, abort, or finish a peer's merge); use fak sync apply (--ff-only) for clean trunk convergence; route divergence via fak sync reconcile (disjoint integration, superset merge, or dirty parking via fak wip park); never force-push, use --autostash, or perform raw 3-way merges. Dual-repo synchronization invariant & Companion Dev Harness: when working across both repos or touching shared interfaces (pkg/*), keep both fak and fak-private synchronized (fetch both remotes and refs/fak/locks/*, fast-forward both, sync go.work to prevent module skew, and audit with public leak scrub tools/scrub_public_copy.py --audit-staged or fak-dev audit-leak --staged). Local development in fak is first-class and companion-governed: pre-commit hooks in fak automatically run 5-gate boundary checks (cmd/fak-boundary) and secret leak audits when fak-private is present. In-tree CLI commands fak-dev gate, fak-dev provenance, fak-dev audit-leak, and fak-dev ticket bridge directly to companion tools without requiring directory switches. Cross-repo issue quoting rule: bare #<num> strictly denotes a public fak issue; quoting a fak-private issue in public fak MUST be explicitly qualified as fak-private#<num> (or anthony-chaudhary/fak-private#<num>) to ensure provenance is unambiguous. Full default + verify command in AGENTS.md.
• Divide and conquer: Delegate substantive work and keep this coordinator context clean; enforce capability-aware scoping and persistence — structurally drive 10x subagent adoption by launching 4–8 (up to 16 on multi-core hosts) specialized subagents concurrently across pairwise tree-disjoint lanes. Decompose substantive or multi-part requests into atomic single-concern units and deploy multi-agent triads per leaf (researcher/explore -> worker -> cross-validator/issue-auditor). Divide and conquer applies equally to hardware verification: isolate compute workloads into discrete sub-components (sub-kernels, GEMV/GEMM microbenchmarks, Vulkan primitives) to test on live physical devices early and often, rather than bottlenecking on monolithic full-model runs. Top-level coordinator (depth 0) aggressively fans out parallel subagents; leaf workers (depth 1) execute directly within assigned package boundaries and must NOT invoke nested task calls (preventing recursion depth exhaustion, #12028). Use guarded headless agents or equivalent isolated workers for investigation, implementation, tests, and review. Constrain smaller models and workers to atomic S0/S1 leaf units (1–3 files, single package, exactly one witness). Scope abstention strictly to bounded high-difficulty aspects (concurrency, frozen ABI, kernel memory layout, security gates): emit a structured ABSTAIN for the escalated boundary while executing all independent, safe, solvable sub-components (such as reproduction tests or diagnostics). Treat guard refusals as actionable feedback rather than session stops: query fak recover <TOKEN>, adapt execution or wait out transient locks, and maintain momentum on the objective without repeating failing calls. Keep only decisions and compact witnessed evidence here; independently verify worker effects before landing or reporting them. Reserve direct work for lightweight coordination and truly trivial tasks. Full contract in AGENTS.md.
• The Go module is the repository root — run go commands from the clone root; go install github.com/anthony-chaudhary/fak/cmd/fak@latest resolves directly.
• Strict Ban on PowerShell and Loose Scripts — Mandatory Modular Go Programs — adding new PowerShell scripts (.ps1), Bash/POSIX shell scripts (.sh), batch files (.bat, .cmd), or loose scripts is STRICTLY BANNED across this repo and fak-private. An exception requires an extraordinary, super heavily justified reason (basically ~1 in the whole repo, such as initial host bootstrapping before Go is installed). All new automation, test runners, harnesses, session orchestrators, and background tooling MUST be native Go programs (cmd/*, Go leaves registered as fak CLI verbs, or quarantined sub-modules). Think modular, integrated, long-term value.