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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-codex/README.md
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@@ -64,12 +64,16 @@ Injected context carries an explicit `{ kind: 'plugin', plugin: 'hooks-codex' }`
**Token effect**: No cost when hooks return no context. Hook text is data-dependent, logged, and resent 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`. Codex `systemMessage` is not surfaced.
**Token effect**: Blocking a prompt removes its 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 (5 of Codex's current 10):** `PermissionRequest`, `PreCompact`, `PostCompact`, `SubagentStart`, and `SubagentStop`. Config for these events is silently dropped during parsing. The comparison baseline is Codex's [official hook reference](https://learn.chatgpt.com/docs/hooks).