meow — Nine Lives Exoskeleton for Claude Code

One sentence: meow turns Claude Code from a brilliant stateless tool into a persistent, self-improving agent by owning the session boundary — birth, exit contract, rebirth.

bun bin/meow.ts -p "fix the auth bug in src/auth.ts"
# → dispatched. the cat lives until the work is done.

What it is: A Bun heartbeat owns session boundaries. A Python governor enforces mechanical gates. Markdown roles provide judgment. Everything is verified before it ships.

What it is not: A coding agent. Meow does not write code directly — it births Claude Code sessions with motive, memory, and discipline, then enforces the exit contract before the next life begins.

Quick start

# Prerequisites: Bun + Python 3
bun bin/meow.ts birth          # debug: print birth prompt, spawn nothing
bun bin/meow.ts -p "your task" # one life
bun bin/meow.ts live           # loop (default 9 lives, budget-capped)

# Governor (run independently)
python3 scripts/run_corpus.py  # all verifiers
python3 scripts/ship_gate.py  # pre-commit gate
python3 scripts/schedule.py   # who runs next

The nine lives model

Every session is a life with a beginning, a middle, and an end. The heartbeat guarantees the next life exists and arrives properly equipped.

birth → [role:phase] → exit contract → rebirth

The loop continues until budget is exhausted or the problem is solved.

Architecture

bin/meow.ts         — Heartbeat (Bun). Session boundary, birth, respawn.
                      209 LOC. Does not make judgments.

scripts/
  run_corpus.py     — The ratchet. Every verifier, deterministically.
  ship_gate.py      — Pre-commit gate. FAIL is final.
  schedule.py       — Who runs next (role:phase), from state.
  budget.py         — Survive-first limits.

skills/meow/
  SKILL.md          — The mind: roles, phases, iteration discipline.
  roles/            — Builder, Planner, Verifier (markdown, loaded by Claude Code).

.meow/              — State: ledger, brain.db, verifiers/, tasks/, goals.md
.mochu/             — Product iteration: gaps.md, competitors.md, RELEASE.md

The gap: code lives in the shell, not in the agent. The agent gets born, does the work, dies, and the shell handles everything that must hold regardless of how smart the model is.

Verification system

Every claim has a verifier. Every verifier is run on every commit. The corpus is the ground truth.

30 verifiers (29 green, 2 skipped)
  v0001-v0002   — scaffold and one-life E2E
  v001-1 to v001-5 — heartbeat suite (spawn, @file, stub read-back, exit contract)
  v003-1 to v003-4 — legacy freeze (branch, swarm deleted, deps stripped)
  v006-1 to v006-4 — thinning ratchet (baseline, ratchet active, LOC count)
  v008-1 to v008-4 — W3: agent/orchestrator/kernel/cli deleted
  v009-1 to v009-4 — W4: perimeter artifacts trimmed
  v010-1 to v010-5 — W5: src/ is empty

python3 scripts/run_corpus.py   # all green or it doesn't ship
python3 scripts/ship_gate.py   # tamper check + secret scan + thinning ratchet

The verifier corpus is a ratchet — it only grows. Past wins are structurally protected from regressions. A verifier written after the work inherits the work's blind spots, so verifiers are authored before implementation.

The rules

1. One life = one role doing one phase. Then die well.
2. Grader ≠ builder. Verifier never reads the builder's narrative.
3. Mechanics over prose. ship_gate.py FAIL is final.
4. Two-lane rule. Reversible → act. Irreversible → .meow/reviews/pending-*.md.
5. Read back every file you write. Stub detection is in the gate.

Dogfood

Meow used itself to migrate off its own legacy. Every deletion was verified. Every state file was updated. The migration ran as a mochu iteration loop.

bun bin/meow.ts -p "clean up the project"   # runs on current repo
bun bin/meow.ts -p "review this codebase"   # runs on any repo

Design docs

• docs/rfc/nine-lives.md — body: mission, heartbeat, gates, brain, migration
• docs/rfc/yugong-harness-design.md — mind: four laws, eight phases, tri-role split
• docs/HANDOFF.md — read this first for context

Version history

Requirements

• Bun (TypeScript runtime — heartbeat)
• Python 3 (governor scripts — stdlib only, no deps)
• Node.js 18+ (for Claude Code)
• ANTHROPIC_API_KEY env var (or set in .env)