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feat(#776): Gemini hook events (BeforeAgent/AfterAgent/BeforeModel) + hooksConfig.enabled check (#829)

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* feat(#776): Gemini hook events (BeforeAgent/AfterAgent/BeforeModel) + hooksConfig.enabled check

Register three new Gemini-CLI hook events on install:
  - BeforeAgent: fires before agent planning; wired to gsd-context-monitor
  - AfterAgent: fires after final response generation; wired to gsd-context-monitor
  - BeforeModel: fires before each LLM call (per-turn); wired to gsd-context-monitor

All three reuse gsd-context-monitor.js (no new hook files). Uninstall cleanup
loop extended to remove the new events. Non-array guard added for robustness
against malformed settings.

Also detect hooksConfig.enabled:false in Gemini settings and emit a clear
warning — without this check, all registered hooks silently do nothing.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* chore: update changeset pr: 829

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* docs(#776): document Gemini hook events

Add hook coverage table to the Gemini CLI section of install-on-your-runtime.md,
covering the three new events (BeforeAgent/AfterAgent/BeforeModel wired to
gsd-context-monitor) plus a callout for the hooksConfig.enabled:false silent
failure mode detected by the installer.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Tom Boucher
2026-06-07 19:16:32 -04:00
committed by GitHub
parent cb284962bf
commit e04e757672
5 changed files with 497 additions and 3 deletions
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---
type: Added
pr: 829
---
Gemini installs now register three additional hook events — `BeforeAgent`, `AfterAgent`, and `BeforeModel` — wired to `gsd-context-monitor.js` for per-turn context headroom tracking. Previously only `SessionStart`, `BeforeTool`, and `AfterTool` were registered. The installer also detects `hooksConfig.enabled: false` in the user's Gemini `settings.json` and emits a clear warning, surfacing the silent failure mode where all hooks are registered but never execute. (#776)