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Feat: add model reroute notification (#12001)

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### Summary
Builiding off
5c75aa7b89 (diff-058ae8f109a8b84b4b79bbfa45f522c2233b9d9e139696044ae374d50b6196e0),
we have created a `model/rerouted` notification that captures the event
so that consumers can render as expected. Keep the `EventMsg::Warning`
path in core so that this does not affect TUI rendering.

`model/rerouted` is meant to be generic to account for future usage
including capacity planning etc.
This commit is contained in:
Shijie Rao
2026-02-17 11:02:23 -08:00
committed by GitHub
parent a1b8e34938
commit 48018e9eac
28 changed files with 605 additions and 146 deletions
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codex-rs/app-server/README.md
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@@ -550,6 +550,7 @@ The app-server streams JSON-RPC notifications while a turn is running. Each turn
- `turn/completed` — `{ turn }` where `turn.status` is `completed`, `interrupted`, or `failed`; failures carry `{ error: { message, codexErrorInfo?, additionalDetails? } }`.
- `turn/diff/updated` — `{ threadId, turnId, diff }` represents the up-to-date snapshot of the turn-level unified diff, emitted after every FileChange item. `diff` is the latest aggregated unified diff across every file change in the turn. UIs can render this to show the full "what changed" view without stitching individual `fileChange` items.
- `turn/plan/updated` — `{ turnId, explanation?, plan }` whenever the agent shares or changes its plan; each `plan` entry is `{ step, status }` with `status` in `pending`, `inProgress`, or `completed`.
- `model/rerouted` — `{ threadId, turnId, fromModel, toModel, reason }` when the backend reroutes a request to a different model (for example, due to high-risk cyber safety checks).
Today both notifications carry an empty `items` array even when item events were streamed; rely on `item/*` notifications for the canonical item list until this is fixed.
@@ -557,7 +558,7 @@ Today both notifications carry an empty `items` array even when item events were
`ThreadItem` is the tagged union carried in turn responses and `item/*` notifications. Currently we support events for the following items:
- `userMessage` — `{id, content}` where `content` is a list of user inputs (`text`, `image`, or `localImage`). Cyber model-routing warnings are surfaced as synthetic `userMessage` items with `text` prefixed by `Warning:`.
- `userMessage` — `{id, content}` where `content` is a list of user inputs (`text`, `image`, or `localImage`).
- `agentMessage` — `{id, text}` containing the accumulated agent reply.
- `plan` — `{id, text}` emitted for plan-mode turns; plan text can stream via `item/plan/delta` (experimental).
- `reasoning` — `{id, summary, content}` where `summary` holds streamed reasoning summaries (applicable for most OpenAI models) and `content` holds raw reasoning blocks (applicable for e.g. open source models).