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Add context event for non-destructive message modification before LLM calls

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- Add contextTransform option to Agent (runs before messageTransformer)
- Deep copy messages before passing to contextTransform (modifications are ephemeral)
- Add ContextEvent and ContextEventResult types
- Add emitContext() to HookRunner (chains multiple handlers)
- Wire up in sdk.ts when creating Agent with hooks

Enables dynamic context pruning: hooks can modify messages sent to LLM
without changing session data. See discussion #330.
This commit is contained in:
Mario Zechner 2025-12-27 19:33:41 +01:00
parent 9e165d1d81
commit 77fe3f1a13
6 changed files with 89 additions and 2 deletions
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packages/coding-agent/docs/session-tree-plan.md
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@ -227,7 +227,7 @@ interface HookUIContext {
See also: `CustomEntry<T>` for storing hook state that does NOT participate in context.
**New: `context` event (TODO)**
**New: `context` event ✅**
Fires before messages are sent to the LLM, allowing hooks to modify context non-destructively.