loopc — CLI reference

loopc is the deterministic factory CLI. Install it globally or run a one-off command through npx:

npm i -g @loopyc/cli
npx --yes @loopyc/cli@latest quickstart

Release 0.8.0 reports its synchronized factory version with loopc --version.

All commands exit non-zero on failure (parse error, validation failure, or a failed verify).

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loopc quickstart [dir]

Create a safe first-loop workspace (default ./loopy-quickstart), validate and score its LoopSpec, execute one deterministic local iteration, inspect the durable journal, and compile a vendored standalone artifact. Refuses to write into a non-empty directory.

loopc quickstart
loopc quickstart ./my-first-loop

This is the clean-room onboarding contract and requires no model or external API.

loopc blueprints

List the built-in starting-point templates (one per pattern).

loopc blueprints

loopc recipes

List the embedded verified product recipes with their schedule and minimum score.

loopc recipes

loopc new <id> [--recipe <name> | --blueprint <name>] [--pattern <pattern>] [--from-shell "<cmd>" --until "<expr>"] [--out <file>]

Scaffold a LoopSpec. With --blueprint, copies that blueprint with id substituted; with --recipe, instantiates a verified workflow and records its origin in provenance; with --from-shell (+ required --until), scaffolds a loop that runs a command each iteration, saves its output to state.out, and exits on the condition; otherwise writes a minimal template for --pattern (default react). Recipe, blueprint, and shell modes are mutually exclusive. Writes to <id>.loop.yaml unless --out is given.

loopc new deploy-watch --blueprint poll-until --out deploy-watch.yaml
loopc new repo-check --recipe repo-health-doctor
loopc new my-launch --blueprint gauntlet
loopc new my-launch --recipe verified-gauntlet
loopc new poller --from-shell "curl -s $URL/health" --until '${state.out.ready == true}'

loopc validate <spec.yaml>

Run the two-tier validator. Prints errors (compile-blocking) and warnings. Exit 1 if invalid.

loopc validate deploy-watch.yaml

loopc verify <spec.yaml> [--fix] [--fixtures <file.json>]

Dry-run the loop through the real runtime with mocked effects (no side effects). Proves it is bounded under caps and deterministic on replay, and reports whether it terminates naturally. By default mocks return {}. --fixtures supplies deterministic, data-only results for shell/http/agent mocks, for example { "shell": { "done": true } }; it never enables real I/O. --fix writes explicit caps into the file if it relied on auto-injected ones. Exit 1 if not bounded/deterministic/resume-stable.

loopc verify deploy-watch.yaml --fix
loopc verify deploy-watch.yaml --fixtures verify-fixtures.json

loopc score <spec.yaml> [--fixtures <file.json>]

Run verify, then grade five weighted dimensions (termination safety, caps, observability, resumability, determinism) into a 0–100 letter grade. The fixture format and side-effect boundary are identical to verify.

loopc score deploy-watch.yaml --fixtures verify-fixtures.json

loopc compile <spec.yaml> [--target standalone,babysitter,claude-code,claude-native,n8n|all] [--out <dir>] [--vendor]

Validate, then lower the spec to runnable artifact(s). Refuses to compile an invalid spec. Target defaults to the spec's target.runtime (or standalone); --target all emits every target. Output goes to <out>/<target>/ (default out/<id>/<target>/). Prints any capability warnings (e.g. soft budget enforcement / http→curl on the babysitter target, or a standalone-only completion observer requested for another target).

--vendor (standalone target only) makes the artifact zero-install: it bundles @loopyc/runtime into a single local runtime.bundle.mjs (via esbuild), rewrites loop.mjs to import from that bundle, and drops the @loopyc/runtime dependency from the emitted package.json. The result runs with plain node loop.mjs run — no npm install, empty node_modules — so a compiled loop is portable to any machine with Node, even one that has never seen this monorepo. Using --vendor with any non-standalone target (or --target all) is an error.

Targets:

• standalone — a complete Node project on @loopyc/runtime (hard caps, journal, resume).
• babysitter — a durable @a5c-ai/babysitter-sdk process (proven on a live run).
• claude-code — a markdown prose execution guide (<id>.loop.md) + Mermaid flow for an agent to follow. No runtime; caps are agent-honored (capability warnings make this explicit).
• claude-native — a Claude Code project skill at .claude/skills/<loop>/SKILL.md, invokable as /<loop>. It prefers a sibling standalone artifact for hard guarantees, and otherwise runs from the embedded LoopSpec contract with Claude-honored caps.
• n8n — a best-effort importable workflow (<id>.n8n.json) scaffold; you wire the exit condition/state (n8n's model differs — heavily caveated in the generated README).

loopc compile deploy-watch.yaml --target all --out ./out/deploy-watch

Standalone output is a complete Node project (loop.mjs, package.json, README.md, loop.lock, .gitignore, plus SKILL.md when target.emit includes skill) that depends only on @loopyc/runtime. Run it:

cd out/deploy-watch/standalone && npm install
node loop.mjs run      # run until termination or a cap
node loop.mjs step     # advance exactly one iteration (for cron / Stop-hook / CI drivers)
node loop.mjs resume   # resume from the journal after a crash/pause
node loop.mjs stop --reason "maintenance"  # request a journal-safe graceful stop
node loop.mjs recover --retry --reason "verified safe" # resolve uncertainty explicitly
node loop.mjs doctor   # preflight checks

With --vendor the standalone output additionally includes runtime.bundle.mjs (the whole runtime, bundled) and the npm install step is unnecessary — node loop.mjs run works straight out of the directory with an empty node_modules.

Babysitter output is an installable project (process.mjs + package.json depending on @a5c-ai/babysitter-sdk) — a durable process for babysitter. npm install, then drive it with the SDK CLI (run:create --non-interactive → run:iterate + task:post, or harness:yolo for a real agent run) — see the generated README.md. This target has been verified end-to-end against the real SDK.

Claude-native output is a Claude Code project skill:

.claude/skills/<loop>/SKILL.md
.claude/skills/<loop>/reference/loopspec.json
.claude/skills/<loop>/loop.lock
.claude/skills/<loop>/scripts/run-standalone.mjs
README.md
loop.lock
loop.source.yaml

Copy the generated .claude/ directory into the repository where the loop should be available, then start Claude Code from that project and invoke the loop by skill directory name:

/<loop> run '{"input_name":"value"}'
/<loop> step
/<loop> resume
/<loop> inspect
/<loop> doctor
/<loop> approve

The generated skill first tries to hand off to a sibling standalone artifact via scripts/run-standalone.mjs. That path preserves the runtime-enforced guarantees: journal, deterministic replay, caps, durable sleep, breakpoints, and budget metering. If no standalone artifact is present, the skill falls back to the embedded LoopSpec contract in reference/loopspec.json; Claude can still run the loop natively, but caps and state updates are agent-honored soft guarantees. loopc compile prints those capability warnings so the boundary is visible before users ship the artifact.

loopc run <spec.yaml> [--out <dir>] [--inputs <file.json>] [--approve] [--yes] [--run-id <id>]

Run a loop directly (validates first — refuses an invalid/unbounded spec). Executes real effects through the runtime, journaling to <out>/.loopy/runs/<run-id> (default .loopy), and prints the RunResult. Inherits process.env (a local dev command, mirroring the compiled node loop.mjs run — unlike the env-scrubbed MCP run_loop). --inputs loads a JSON file; --yes/--auto-approve auto-approves human breakpoints; --approve approves a pending cap-breakpoint and continues. Exits non-zero only on a failed run.

loopc run my-loop.yaml --out ./run --inputs inputs.json

loopc inspect <dir> [--tail <n>] [--run-id <id>]

Inspect a run directory: status/iteration, the latest snapshot state, and the last n journal events (default 10). Errors if no journal exists under the dir.

loopc inspect ./run --tail 20

loopc schedule install <artifact-dir>

For a compiled artifact whose schedule.mode is recurring (cron/forever/watch), the standalone target emits a schedule/ dir (crontab line, systemd .service+.timer, launchd plist, GitHub Actions workflow). This command reads it and prints the platform-appropriate install snippet (no daemon, no side effects — it just shows you what to install).

loopc schedule install ./out/deploy-watch/standalone

loopc reprint <artifact-dir> [--target <t>] [--out <dir>]

Recompile an existing artifact under the current factory. Reads the embedded loop.source.yaml (written by compile), re-validates, and re-emits — to the same target (from loop.lock) and in place by default, or to --target / --out. Use it to refresh generated artifacts after upgrading Monkey D Loopy.

loopc reprint ./out/deploy-watch/standalone

loopc targets

Print the per-target capability matrix (✓ enforced · ~ soft · ✗ unsupported), so you can see at a glance which guarantees each compile target provides.

loopc infer-scaffold <script-or-journal> [--out <draft.yaml>]

Deterministically extract a FactPack from an existing script (JS/TS via the TypeScript AST, or bash) or a .loopy journal, and emit a draft LoopSpec — candidate pattern + steps + a loop-condition hint, with secrets flagged. The draft has TODOs and is not guaranteed valid: complete it (map the exit to a real state signal, fill placeholders), then validate/verify. verify proves bounded, not faithful — review the draft against the source.

loopc infer-scaffold ./watch.sh --out watch.loop.yaml

Typical flow

loopc new my-loop --blueprint loop-until-dry --out my-loop.yaml
# edit my-loop.yaml
loopc validate my-loop.yaml
loopc verify   my-loop.yaml --fix
loopc score    my-loop.yaml
loopc compile  my-loop.yaml --target all --out ./out/my-loop