harn

Build or rebuild AGENTS.md with progressive disclosure

Audit your project's harness against the CAR framework

Generate resume artifacts — LEARNED.md, CHECKPOINT.json — for long-running sessions

Add context monitoring and backpressure hooks to manage agent attention budget

Generate or update PostToolUse auto-formatter hook

Generate or update quality gate Stop hook

Generate or update security guardrail hooks

Scaffold a complete harness for the current project — AGENTS.md, hooks, guardrails

Generate MCP server health check hook

Generate PostToolUse trace logging hook for agent observability

Validates generated harness artifacts for correctness and best practices. Use after generating AGENTS.md, hooks, or guardrails to verify quality. <example>Context: After /harn:init generated files. user: "I just ran harn init" assistant: "Let me validate the generated harness." <commentary>Use harness-evaluator to check generated artifacts.</commentary></example>

Audit project harness against the CAR framework. Use when: /harn:analyze, 'audit harness', 'check CAR', 'harness health', 'how good is my harness'

Scaffold resume artifacts (LEARNED.md, CHECKPOINT.json) for long-running sessions. Triggers: /harn:checkpoint, 'resume artifacts', 'checkpoint', 'session recovery', 'LEARNED.md'

Generate context monitoring and backpressure hooks. Triggers: /harn:context, 'context monitoring', 'backpressure', 'context budget', 'attention budget', 'context rot'

Scaffold a complete harness for the current project — AGENTS.md, hooks, guardrails. Use when starting a new project or hardening an existing one. Triggers: /harn:init, 'set up harness', 'scaffold guardrails', 'create AGENTS.md'

Generate MCP server health check for SessionStart. Triggers: /harn:mcp-check, 'MCP health', 'check MCP servers', 'validate MCP'

Generate or update the quality gate Stop hook. Use when: /harn:quality-gate, 'set up type checking', 'add quality gate', 'stop hook'

Generate or update security guardrail hooks. Use when: /harn:guard, 'update security rules', 'block dangerous commands', 'add guardrail'

Generate PostToolUse trace logging hook for observability. Triggers: /harn:trace, 'trace logging', 'observable hooks', 'agent trace', 'JSONL logging'

Build or rebuild AGENTS.md with progressive disclosure. Use when: /harn:agents-md, 'create AGENTS.md', 'update agent instructions', 'too many instructions'

Generate PostToolUse auto-formatter hook. Triggers: /harn:format, 'auto format', 'formatter hook', 'PostToolUse formatter'

1 hook across 1 event