Git hook and CI guardrails for AI-assisted software development.

Ripstop is a TypeScript CLI that runs policy checks at Git boundaries (commit, commit message, push, rebase, CI). It targets repos where Cursor, Claude Code, Codex, Amazon Q, or humans make changes: the same rules apply no matter who produced the diff.

It does not replace sandboxing, server-side branch protection, secret scanning, or code review. It does give you a consistent, repo-local enforcement layer, optional agent-readable summaries (RIPSTOP.md), and forensics so casual mistakes and “quietly weaken the guardrails” edits are much harder.

Invoke the CLI as ripstop (for example npx ripstop when the package is a devDependency).

Built-in checks (today)

Each check is configured under checks.<name> in .guardrails.yaml, with mode: off | warn | enforce, triggers, and check-specific options. Built-in presets (for example @jonverrier/ripstop/presets/internal-tooling) wire defaults; repos can extend or override.

Further behaviour is in docs/ripstop-spec.md. Checks specified but not implemented yet are listed in docs/ripstop-roadmap-plan.md.

Use commit-msg for path-guard (and other trailer-based rules): Git has not finalized the message at pre-commit.

Agent context (0.1.x — RIPSTOP.md)

From 0.1.x onward, Ripstop can mirror resolved policy into Layer 1 (agent static context) so agents see active rules before they edit.

• ripstop generate-md — Writes RIPSTOP.md from merged config (local YAML + extends: presets). Commit it and reference it from AGENTS.md / harness manifests (docs/per-agent-config.md).
• Per-agent formats — --format claude, cursor, codex, q adjust framing; the config hash in the file is the same across formats so ripstop-md-fresh stays consistent.
• ripstop-md-fresh — Fails when RIPSTOP.md is missing or stale vs resolved config.
• Flags — --output, --check-fresh, --dry-run, --config.

Design notes: docs/ripstop-markdown-enhancement-spec.md.

npx ripstop generate-md
git add RIPSTOP.md

Self-protection (0.2.x)

0.2.x closes the gap where an agent could weaken .guardrails.yaml or generated docs in the same commit as “fixing” a failure.

1. path-guard preset defaults — Presets add .guardrails.yaml, .guardrails/**, RIPSTOP.md, and .claude/settings*.json (including settings.ripstop.json) to protected_paths, with the same approval trailer as your other paths. Dedicated findings call out guardrails self-protection.
2. RIPSTOP.md — Generated copy includes what you must not modify; optional Claude output adds harness-oriented deny rules.
3. ripstop generate-md --format claude — Writes .claude/settings.ripstop.json; merge permissions.deny into your real .claude/settings.json per docs/per-agent-config.md.
4. reflog-witness — Witness lines include .guardrails.yaml and RIPSTOP.md hashes (and yaml content on change, within limits).
5. ripstop recover --config-history — Prints witness history (optional --since, --config).

This is not tamper-proof against shell access and --no-verify. Details: docs/ripstop-self-protection-enhancement-spec.md.

npx ripstop recover --config-history
npx ripstop recover --config-history --since 2026-01-01T00:00:00.000Z

Observability

• Findings — human or JSON (configurable).
• reporting.audit_log — findings / bypasses (default .git/ripstop/audit.jsonl).
• reporting.witness_log — witness events (default .git/ripstop/witness.jsonl), including reflog-witness.

Documentation

Install

npm install --save-dev @jonverrier/ripstop

Example Husky wiring:

npx ripstop check --staged --trigger pre-commit
npx ripstop check --staged --trigger commit-msg --commit-msg-file "$1"
npx ripstop check --trigger pre-push
npx ripstop check --trigger pre-rebase

Minimal .guardrails.yaml

repo:
  name: my-service
  domain: tooling
  tier: 2

extends: "@jonverrier/ripstop/presets/internal-tooling"

checks:
  path-guard:
    mode: enforce
    triggers: [commit-msg, ci]
    protected_paths:
      - "infra/**"
      - "migrations/**"
    approval_trailer: "CHANGE-APPROVED"

  test-skip:
    mode: warn
    triggers: [pre-commit, ci]

The internal-tooling preset already includes self-protection paths, reflog-witness, ripstop-md-fresh, and history-guard. See src/presets/ for the full merged defaults.

CLI

ripstop check [--staged | --all | --diff <ref>] --trigger <trigger> [options]
ripstop generate-md [options]
ripstop recover --config-history [--since <iso>] [--config <path>]
ripstop list
ripstop explain <check> [--resolved]
ripstop version

--trigger: pre-commit, commit-msg, pre-push, pre-rebase, pre-action, ci.

Build

npm install
npm run build
npm run test:ci
npm pack --dry-run

Binary distribution

The package is designed to support Bun-compiled standalone binaries in a later milestone. Binary consumers can use built-in checks and YAML config. npm plugin checks and repo-local TypeScript checks expect a Node-compatible runtime.

License

MIT