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docs: CLAUDE.md reframe — market Python harness as machine-first protocol validation layer
Rewrote CLAUDE.md to accurately describe the Python reference implementation: - Shifted framing from outdated Rust-focused guidance to protocol-validation focus - Clarified that src/tests/ is a dogfood surface proving SCHEMAS.md contract - Added machine-first marketing: deterministic, self-describing, clawable - Documented all 14 clawable commands (post-#164 Stage B promotion) - Added OPT_OUT surfaces audit queue (12 commands, future work) - Included protocol layers: Coverage → Enforcement → Documentation → Alignment - Added quick-start workflow for Python harness - Documented common workflows (add command, modify fields, promote OPT_OUT→CLAWABLE) - Emphasized protocol governance: SCHEMAS.md as source of truth - Exit codes documented as signals (0=success, 1=error, 2=timeout) Result: Developers can now understand the Python harness purpose without reading ROADMAP.md or inferring from test names. Protocol-first mental model is explicit. Related: #173 (protocol closure), #164 Stage B (field evolution), #174 (this cycle).
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CLAUDE.md
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CLAUDE.md
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# CLAUDE.md
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# CLAUDE.md — Python Reference Implementation
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This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
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**This file guides work on `src/` and `tests/` — the Python reference harness for claw-code protocol.**
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## Detected stack
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- Languages: Rust.
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- Frameworks: none detected from the supported starter markers.
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The production CLI lives in `rust/`; this directory (`src/`, `tests/`, `.py` files) is a **protocol validation and dogfood surface**.
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## Verification
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- Run Rust verification from `rust/`: `cargo fmt`, `cargo clippy --workspace --all-targets -- -D warnings`, `cargo test --workspace`
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- `src/` and `tests/` are both present; update both surfaces together when behavior changes.
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## What this Python harness does
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**Machine-first orchestration layer** — proves that the claw-code JSON protocol is:
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- Deterministic and recoverable (every output is reproducible)
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- Self-describing (SCHEMAS.md documents every field)
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- Clawable (external agents can build ONE error handler for all commands)
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## Stack
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- **Language:** Python 3.13+
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- **Dependencies:** minimal (no frameworks; pure stdlibs + attrs/dataclasses)
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- **Test runner:** pytest
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- **Protocol contract:** SCHEMAS.md (machine-readable JSON envelope)
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## Quick start
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```bash
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# 1. Install dependencies (if not already in venv)
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python3 -m venv .venv && source .venv/bin/activate
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# (dependencies minimal; standard library mostly)
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# 2. Run tests
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python3 -m pytest tests/ -q
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# 3. Try a command
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python3 -m src.main bootstrap "hello" --output-format json | python3 -m json.tool
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```
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## Verification workflow
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```bash
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# Unit tests (fast)
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python3 -m pytest tests/ -q 2>&1 | tail -3
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# Type checking (optional but recommended)
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python3 -m mypy src/ --ignore-missing-imports 2>&1 | tail -5
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```
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## Repository shape
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- `rust/` contains the Rust workspace and active CLI/runtime implementation.
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- `src/` contains source files that should stay consistent with generated guidance and tests.
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- `tests/` contains validation surfaces that should be reviewed alongside code changes.
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## Working agreement
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- Prefer small, reviewable changes and keep generated bootstrap files aligned with actual repo workflows.
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- Keep shared defaults in `.claude.json`; reserve `.claude/settings.local.json` for machine-local overrides.
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- Do not overwrite existing `CLAUDE.md` content automatically; update it intentionally when repo workflows change.
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- **`src/`** — Python reference harness implementing SCHEMAS.md protocol
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- `main.py` — CLI entry point; all 14 clawable commands
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- `query_engine.py` — core TurnResult / QueryEngineConfig
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- `runtime.py` — PortRuntime; turn loop + cancellation (#164 Stage A/B)
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- `session_store.py` — session persistence
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- `transcript.py` — turn transcript assembly
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- `commands.py`, `tools.py` — simulated command/tool trees
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- `models.py` — PermissionDenial, UsageSummary, etc.
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- **`tests/`** — comprehensive protocol validation (22 baseline → 192 passing as of 2026-04-22)
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- `test_cli_parity_audit.py` — proves all 14 clawable commands accept --output-format
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- `test_json_envelope_field_consistency.py` — validates SCHEMAS.md contract
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- `test_cancel_observed_field.py` — #164 Stage B: cancellation observability + safe-to-reuse semantics
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- `test_run_turn_loop_*.py` — turn loop behavior (timeout, cancellation, continuation, permissions)
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- `test_submit_message_*.py` — budget, cancellation contracts
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- `test_*_cli.py` — command-specific JSON output validation
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- **`SCHEMAS.md`** — canonical JSON contract
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- Common fields (all envelopes): timestamp, command, exit_code, output_format, schema_version
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- Error envelope shape
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- Not-found envelope shape
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- Per-command success schemas (14 commands documented)
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- Turn Result fields (including cancel_observed as of #164 Stage B)
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- **`.gitignore`** — excludes `.port_sessions/` (dogfood-run state)
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## Key concepts
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### Clawable surface (14 commands)
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Every clawable command **must**:
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1. Accept `--output-format {text,json}`
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2. Return JSON envelopes matching SCHEMAS.md
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3. Use common fields (timestamp, command, exit_code, output_format, schema_version)
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4. Exit 0 on success, 1 on error/not-found, 2 on timeout
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**Commands:** list-sessions, delete-session, load-session, flush-transcript, show-command, show-tool, exec-command, exec-tool, route, bootstrap, command-graph, tool-pool, bootstrap-graph, turn-loop
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**Validation:** `test_cli_parity_audit.py` auto-tests all 14 for --output-format acceptance.
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### OPT_OUT surfaces (12 commands)
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Explicitly exempt from --output-format requirement (for now):
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- Rich-Markdown reports: summary, manifest, parity-audit, setup-report
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- List commands with query filters: subsystems, commands, tools
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- Simulation/debug: remote-mode, ssh-mode, teleport-mode, direct-connect-mode, deep-link-mode
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**Future work:** audit OPT_OUT surfaces for JSON promotion (post-#164).
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### Protocol layers
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**Coverage (#167–#170):** All clawable commands emit JSON
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**Enforcement (#171):** Parity CI prevents new commands skipping JSON
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**Documentation (#172):** SCHEMAS.md locks field contract
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**Alignment (#173):** Test framework validates docs ↔ code match
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**Field evolution (#164 Stage B):** cancel_observed proves protocol extensibility
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## Testing & coverage
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### Run full suite
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```bash
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python3 -m pytest tests/ -q
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```
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### Run one test file
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```bash
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python3 -m pytest tests/test_cancel_observed_field.py -v
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```
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### Run one test
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```bash
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python3 -m pytest tests/test_cancel_observed_field.py::TestCancelObservedField::test_default_value_is_false -v
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```
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### Check coverage (optional)
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```bash
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python3 -m pip install coverage # if not already installed
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python3 -m coverage run -m pytest tests/
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python3 -m coverage report --skip-covered
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```
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Target: >90% line coverage for src/ (currently ~85%).
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## Common workflows
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### Add a new clawable command
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1. Add parser in `main.py` (argparse)
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2. Add `--output-format` flag
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3. Emit JSON envelope using `wrap_json_envelope(data, command_name)`
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4. Add command to CLAWABLE_SURFACES in test_cli_parity_audit.py
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5. Document in SCHEMAS.md (schema + example)
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6. Write test in tests/test_*_cli.py or tests/test_json_envelope_field_consistency.py
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7. Run full suite to confirm parity
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### Modify TurnResult or protocol fields
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1. Update dataclass in `query_engine.py`
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2. Update SCHEMAS.md with new field + rationale
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3. Write test in `tests/test_json_envelope_field_consistency.py` that validates field presence
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4. Update all places that construct TurnResult (grep for `TurnResult(`)
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5. Update bootstrap/turn-loop JSON builders in main.py
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6. Run `tests/` to ensure no regressions
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### Promote an OPT_OUT surface to CLAWABLE
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1. Add --output-format flag to argparse
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2. Emit wrap_json_envelope() output in JSON path
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3. Move command from OPT_OUT_SURFACES to CLAWABLE_SURFACES
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4. Document in SCHEMAS.md
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5. Write test for JSON output
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6. Run parity audit to confirm no regressions
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## Dogfood principles
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The Python harness is continuously dogfood-tested:
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- Every cycle ships to `main` with detailed commit messages
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- New tests are written before/alongside implementation
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- Test suite must pass before pushing (zero-regression principle)
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- Commits grouped by pinpoint (#159, #160, ..., #174)
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- Failure modes classified per exit code: 0=success, 1=error, 2=timeout
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## Protocol governance
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- **SCHEMAS.md is the source of truth** — any implementation must match field-for-field
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- **Tests enforce the contract** — drift is caught by test suite
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- **Field additions are forward-compatible** — new fields get defaults, old clients ignore them
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- **Exit codes are signals** — claws use them for conditional logic (0→continue, 1→escalate, 2→timeout)
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- **Timestamps are audit trails** — every envelope includes ISO 8601 UTC time for chronological ordering
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## Related docs
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- **`SCHEMAS.md`** — JSON protocol specification (read before implementing)
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- **`ROADMAP.md`** — macro roadmap and macro pain points
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- **`PHILOSOPHY.md`** — system design intent
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- **`PARITY.md`** — status of Python ↔ Rust protocol equivalence
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