agent-harness-reference

Field reference for Claude Code and GitHub Copilot CLI hook contracts. Covers hook locations, events, matchers, payloads, decisions, exit codes, timeouts, plugin roots, and cloud limits with official URLs and versioned probes. Use for harness contract, copilot cli hook behavior, hook payload format, stale plugin root, Errno 2 _dispatch.py, or before changing cross-harness hooks. Do NOT use to run the porting…