CLAUDE CODE HOOKS COMPATIBILITY

OVERVIEW

Full Claude Code settings.json hook compatibility layer. Intercepts OpenCode events to execute external scripts/commands.

Config Sources (priority): .claude/settings.local.json > .claude/settings.json (project) > ~/.claude/settings.json (global)

STRUCTURE

claude-code-hooks/
├── index.ts              # Main factory (421 lines)
├── config.ts             # Loads ~/.claude/settings.json
├── config-loader.ts      # Extended config (disabledHooks)
├── pre-tool-use.ts       # PreToolUse executor
├── post-tool-use.ts      # PostToolUse executor
├── user-prompt-submit.ts # UserPromptSubmit executor
├── stop.ts               # Stop hook executor (with active state tracking)
├── pre-compact.ts        # PreCompact executor
├── transcript.ts         # Tool use recording
├── tool-input-cache.ts   # Pre→post input caching
├── todo.ts               # Todo integration
└── types.ts              # Hook & IO type definitions

HOOK LIFECYCLE

Event	Timing	Can Block	Context Provided
PreToolUse	Before tool exec	Yes	sessionId, toolName, toolInput, cwd
PostToolUse	After tool exec	Warn	+ toolOutput, transcriptPath
UserPromptSubmit	On message send	Yes	sessionId, prompt, parts, cwd
Stop	Session idle/end	Inject	sessionId, parentSessionId, cwd
PreCompact	Before summarize	No	sessionId, cwd

HOOK EXECUTION

Matchers: Hooks filter by tool name or event type via regex/glob
Commands: Executed via subprocess with env vars ($SESSION_ID, $TOOL_NAME)
Exit Codes:
- 0: Pass (Success)
- 1: Warn (Continue with system message)
- 2: Block (Abort operation/prompt)

ANTI-PATTERNS

Heavy PreToolUse: Runs before EVERY tool; keep logic light to avoid latency
Blocking non-critical: Prefer PostToolUse warnings for non-fatal issues
Direct state mutation: Use updatedInput in PreToolUse instead of side effects
Ignoring Exit Codes: Ensure scripts return 2 to properly block sensitive tools

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