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.claude/skills/trellis-meta/references/customize-local/change-hooks.md

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+# Change Local Hooks
+
+Hooks are the automation layer that connects a platform to Trellis. When the user wants to change "when context is injected," "how shell commands inherit a session," or "which files are read before an agent starts," hooks are usually the edit point.
+
+## Read These Files First
+
+1. Target platform settings/config, such as `.claude/settings.json`, `.codex/hooks.json`, `.cursor/hooks.json`
+2. Target platform hooks directory
+3. `.trellis/scripts/common/active_task.py`
+4. `.trellis/scripts/common/session_context.py`
+5. `.trellis/workflow.md`
+
+## Common Hook Types
+
+| Hook | Purpose |
+| --- | --- |
+| session-start | Injects a Trellis overview when a session starts, clears, or compacts. |
+| workflow-state | Injects a state hint on each user input. |
+| sub-agent context | Injects PRD/spec/research before an agent starts. |
+| shell session bridge | Lets `task.py` commands in shell see the same session identity. |
+
+## Modification Steps
+
+1. Find the hook registration in settings/config.
+2. Confirm the registered script path exists.
+3. Read the hook script and identify inputs, outputs, and called `.trellis/scripts/`.
+4. Modify hook behavior.
+5. If the hook depends on workflow content, synchronize `.trellis/workflow.md`.
+
+## Example: Change New-Session Injection Content
+
+First find the session-start hook:
+
+```text
+.claude/settings.json
+.claude/hooks/session-start.py
+```
+
+If the hook ultimately calls `.trellis/scripts/get_context.py` or `session_context.py`, editing the local script is usually more robust than hard-coding content in the hook.
+
+## Example: Agent Did Not Read JSONL
+
+First confirm:
+
+```bash
+python ./.trellis/scripts/task.py current --source
+python ./.trellis/scripts/task.py validate <task>
+```
+
+If the task and JSONL are correct, determine whether the platform uses hook push or agent pull. For hook push, edit `inject-subagent-context`; for agent pull, edit the agent file.
+
+## Notes
+
+- Settings handle registration, hook scripts handle behavior; inspect both together.
+- Different platforms support different hook events. Do not directly copy another platform's settings.
+- Hooks should read project-local `.trellis/`; they should not depend on Trellis upstream source paths.
+- Hook failures should produce visible errors so AI does not silently lose context.