llm-gate

# LLM Gate Use Claude Code's `type: "prompt"` hooks to create intelligent quality gates that use AI to verify operations. ## Trigger Use when: - Setting up commit message validation - Enforcing code conventions beyond what linters catch - Creating smart guardrails for specific operations ## How Prompt Hooks Work Claude Code supports hooks with `type: "prompt"` that run a small LLM (Haiku by default) to verify conditions: ```json { "PreToolUse": [{ "matcher": "Bash", "hooks": [{ "type": "prompt", "if": "Bash(git commit*)", "prompt": "Check if this git commit follows conventional commit format (<type>(<scope>): <summary>). The commit command is: $ARGUMENTS. Return {\"ok\": true} if valid, {\"ok\": false, \"reason\": \"...\"} if not.", "model": "haiku", "timeout": 15 }] }] } ``` The hook: 1. Substitutes `$ARGUMENTS` with the JSON hook input 2. Sends to Haiku (fast, cheap) 3. Expects `{"ok": true}` or `{"ok": false, "reason": "..."}` 4. If not ok → blocks the tool call with the reason ## Example Gates ### Conventional Commit Validator ```json { "type": "prompt", "if": "Bash(git commit*)", "prompt": "Verify this git commit follows conventional commits: type(scope): summary. Types: feat,fix,refactor,test,docs,chore,perf,ci. Summary under 72 chars. Input: $ARGUMENTS", "model": "haiku" } ``` ### Destructive Command Guard ```json { "type": "prompt", "if": "Bash(rm *)", "prompt": "Check if this rm command is safe. Fl...