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add prependSystemContext and appendSystemContext to before_prompt_build (fixes #35131) (#35177)

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Merged via squash.

Prepared head SHA: d9a2869ad69db9449336a2e2846bd9de0e647ac6
Co-authored-by: maweibin <18023423+maweibin@users.noreply.github.com>
Co-authored-by: gumadeiras <5599352+gumadeiras@users.noreply.github.com>
Reviewed-by: @gumadeiras
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maweibin
2026-03-06 02:06:59 +08:00
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parent 174eeea76c
commit 09c68f8f0e
11 changed files with 265 additions and 11 deletions
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docs/concepts/agent-loop.md
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@@ -82,7 +82,7 @@ See [Hooks](/automation/hooks) for setup and examples.
These run inside the agent loop or gateway pipeline:
- **`before_model_resolve`**: runs pre-session (no `messages`) to deterministically override provider/model before model resolution.
- **`before_prompt_build`**: runs after session load (with `messages`) to inject `prependContext`/`systemPrompt` before prompt submission.
- **`before_prompt_build`**: runs after session load (with `messages`) to inject `prependContext`, `systemPrompt`, `prependSystemContext`, or `appendSystemContext` before prompt submission. Use `prependContext` for per-turn dynamic text and system-context fields for stable guidance that should sit in system prompt space.
- **`before_agent_start`**: legacy compatibility hook that may run in either phase; prefer the explicit hooks above.
- **`agent_end`**: inspect the final message list and run metadata after completion.
- **`before_compaction` / `after_compaction`**: observe or annotate compaction cycles.