Files
codex/codex-rs/app-server-protocol/schema/json/v2/TurnSteerParams.json
Owen Lin 0d8b2b74c4 feat(app-server): turn/steer API (#10821)
This PR adds a dedicated `turn/steer` API for appending user input to an
in-flight turn.

## Motivation
Currently, steering in the app is implemented by just calling
`turn/start` while a turn is running. This has some really weird quirks:
- Client gets back a new `turn.id`, even though streamed
events/approvals remained tied to the original active turn ID.
- All the various turn-level override params on `turn/start` do not
apply to the "steer", and would only apply to the next real turn.
- There can also be a race condition where the client thinks the turn is
active but the server has already completed it, so there might be bugs
if the client has baked in some client-specific behavior thinking it's a
steer when in fact the server kicked off a new turn. This is
particularly possible when running a client against a remote app-server.

Having a dedicated `turn/steer` API eliminates all those quirks.

`turn/steer` behavior:
- Requires an active turn on threadId. Returns a JSON-RPC error if there
is no active turn.
- If expectedTurnId is provided, it must match the active turn (more
useful when connecting to a remote app-server).
- Does not emit `turn/started`.
- Does not accept turn overrides (`cwd`, `model`, `sandbox`, etc.) or
`outputSchema` to accurately reflect that these are not applied when
steering.
2026-02-06 00:35:04 +00:00

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JSON

{
"$schema": "http://json-schema.org/draft-07/schema#",
"definitions": {
"ByteRange": {
"properties": {
"end": {
"format": "uint",
"minimum": 0.0,
"type": "integer"
},
"start": {
"format": "uint",
"minimum": 0.0,
"type": "integer"
}
},
"required": [
"end",
"start"
],
"type": "object"
},
"TextElement": {
"properties": {
"byteRange": {
"allOf": [
{
"$ref": "#/definitions/ByteRange"
}
],
"description": "Byte range in the parent `text` buffer that this element occupies."
},
"placeholder": {
"description": "Optional human-readable placeholder for the element, displayed in the UI.",
"type": [
"string",
"null"
]
}
},
"required": [
"byteRange"
],
"type": "object"
},
"UserInput": {
"oneOf": [
{
"properties": {
"text": {
"type": "string"
},
"text_elements": {
"default": [],
"description": "UI-defined spans within `text` used to render or persist special elements.",
"items": {
"$ref": "#/definitions/TextElement"
},
"type": "array"
},
"type": {
"enum": [
"text"
],
"title": "TextUserInputType",
"type": "string"
}
},
"required": [
"text",
"type"
],
"title": "TextUserInput",
"type": "object"
},
{
"properties": {
"type": {
"enum": [
"image"
],
"title": "ImageUserInputType",
"type": "string"
},
"url": {
"type": "string"
}
},
"required": [
"type",
"url"
],
"title": "ImageUserInput",
"type": "object"
},
{
"properties": {
"path": {
"type": "string"
},
"type": {
"enum": [
"localImage"
],
"title": "LocalImageUserInputType",
"type": "string"
}
},
"required": [
"path",
"type"
],
"title": "LocalImageUserInput",
"type": "object"
},
{
"properties": {
"name": {
"type": "string"
},
"path": {
"type": "string"
},
"type": {
"enum": [
"skill"
],
"title": "SkillUserInputType",
"type": "string"
}
},
"required": [
"name",
"path",
"type"
],
"title": "SkillUserInput",
"type": "object"
},
{
"properties": {
"name": {
"type": "string"
},
"path": {
"type": "string"
},
"type": {
"enum": [
"mention"
],
"title": "MentionUserInputType",
"type": "string"
}
},
"required": [
"name",
"path",
"type"
],
"title": "MentionUserInput",
"type": "object"
}
]
}
},
"properties": {
"expectedTurnId": {
"description": "Required active turn id precondition. The request fails when it does not match the currently active turn.",
"type": "string"
},
"input": {
"items": {
"$ref": "#/definitions/UserInput"
},
"type": "array"
},
"threadId": {
"type": "string"
}
},
"required": [
"expectedTurnId",
"input",
"threadId"
],
"title": "TurnSteerParams",
"type": "object"
}