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docs: document package KV cache effects

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Tianyi Cui
2026-07-19 17:39:50 +08:00
parent b3c4b732d8
commit bcc920369c
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packages/hooks/hooks-claude/README.md
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@@ -60,12 +60,16 @@ Injected context carries an explicit `{ kind: 'plugin', plugin: 'hooks-claude' }
**Token effect**: No cost when hooks return no context. Hook text is data-dependent, logged, and resent in later conversation requests until compaction.
**KV Cache effect**: Append-only; newly visible content follows the reusable request prefix and does not invalidate existing KV-cache entries.
### Blocked prompt or tool outcome
**What the model sees**: Provider-supplied reasons pass through verbatim. When absent, a blocked prompt uses exactly `blocked by UserPromptSubmit hook`, a denied tool becomes `Error: blocked by PreToolUse hook`, blocked post-tool feedback is exactly `blocked by PostToolUse hook`, and a blocking stop adds steering exactly `continue: blocked by Stop hook`. `systemMessage` and `updatedInput` are logged or warned but are not model-visible in this implementation.
**Token effect**: Blocking a prompt removes that prompt's request tokens; denial or feedback adds the retained fallback or provider text; forced continuation pays another full request.
**KV Cache effect**: A blocked prompt sends no request and invalidates nothing. Denial, feedback, and forced-continuation context append after the reusable prefix without rewriting it.
## Known Limitations and Deferred Work
- **Unsupported hook events (23 of Claude Code's current 30):** `Setup`, `InstructionsLoaded`, `UserPromptExpansion`, `MessageDisplay`, `PermissionRequest`, `PostToolUseFailure`, `PostToolBatch`, `PermissionDenied`, `Notification`, `TaskCreated`, `TaskCompleted`, `StopFailure`, `TeammateIdle`, `ConfigChange`, `CwdChanged`, `FileChanged`, `WorktreeCreate`, `WorktreeRemove`, `PreCompact`, `PostCompact`, `SessionEnd`, `Elicitation`, and `ElicitationResult`. Config for these events is parsed but never dispatched. The comparison baseline is Claude Code's [official hook-event reference](https://code.claude.com/docs/en/hooks#hook-events).