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core: add configurable <context_window_guidance> message (#29936)

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## Why

This PR adds a configurable `<context_window_guidance>` developer
section immediately after `<context_window>`. Harness integrations need
this section to give the model deployment-specific instructions for
preparing for context-window transitions.

## What changed

- Add an optional `features.token_budget.guidance_message` config with a
1,000-byte runtime cap and generated schema support.
- Render configured guidance as a developer `ContextualUserFragment`
wrapped in `<context_window_guidance>` immediately after
`<context_window>`.
- Omit the section when guidance is unset, empty, or whitespace-only.
- Preserve the resolved value in config locks and classify persisted
guidance as contextual developer content.
- Add integration coverage for rendered content and ordering.
This commit is contained in:
Michael Bolin
2026-06-24 18:03:44 -07:00
committed by GitHub
parent f4e6aa70e5
commit f15df624a6
12 changed files with 145 additions and 0 deletions
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codex-rs/protocol/src/protocol.rs
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@@ -114,6 +114,8 @@ pub const REALTIME_CONVERSATION_OPEN_TAG: &str = "<realtime_conversation>";
pub const REALTIME_CONVERSATION_CLOSE_TAG: &str = "</realtime_conversation>";
pub const CONTEXT_WINDOW_OPEN_TAG: &str = "<context_window>";
pub const CONTEXT_WINDOW_CLOSE_TAG: &str = "</context_window>";
pub const CONTEXT_WINDOW_GUIDANCE_OPEN_TAG: &str = "<context_window_guidance>";
pub const CONTEXT_WINDOW_GUIDANCE_CLOSE_TAG: &str = "</context_window_guidance>";
pub const USER_MESSAGE_BEGIN: &str = "## My request for Codex:";
// TODO(anp): Replace `TurnEnvironmentSelection` with `PathUri` once path URIs carry environment