Files
codex/codex-rs/app-server-protocol/schema/json/v2/ThreadStartParams.json
T
Shijie Rao 7abfcf220b Expose thread-level multi-agent mode (#28792)
## Why

Once multi-agent mode can be selected per turn, clients also need to
choose the initial selection when creating a thread and observe that
selection through lifecycle and settings APIs.

The selected value is intentionally distinct from the effective
model-visible value: no client selection is represented as `null`, even
though an eligible multi-agent v2 turn derives `explicitRequestOnly` as
its effective default.

## What changed

- Add the optional experimental `thread/start.multiAgentMode` parameter
and pass it through thread creation.
- Preserve an omitted initial value as an unset selection rather than
eagerly storing `explicitRequestOnly`.
- Apply an explicit `thread/start` selection to the first turn through
the session configuration established at thread creation.
- Restore the latest persisted effective mode as the selected baseline
on cold resume when rollout history contains one.
- Inherit the optional selected mode from a loaded parent when creating
related runtime threads.
- Return the current selected `multiAgentMode` from `thread/start`,
`thread/resume`, `thread/fork`, and thread settings, using `null` when
no mode is selected.
- Keep lifecycle reporting independent from model capability and feature
eligibility; core turn construction remains responsible for calculating
and persisting the effective mode.

## Not covered

- Clearing an existing loaded-session selection back to unset through
`turn/start`; omitted or `null` currently retains the session's
selection.
- A TUI control, slash command, or `config.toml` preference.

## Verification

- `CARGO_INCREMENTAL=0 just test -p codex-app-server-protocol`
- `CARGO_INCREMENTAL=0 just test -p codex-app-server multi_agent_mode`

The focused app-server coverage verifies explicit `thread/start`
initialization, first-turn prompting, nullable reporting for an omitted
selection, and retention of selections that are not currently
runtime-eligible.

## Stack

Stacked on #28685. This PR contains only the thread initialization and
lifecycle/settings API layer.
2026-06-19 10:50:44 +02:00

390 lines
9.1 KiB
JSON
Generated

{
"$schema": "http://json-schema.org/draft-07/schema#",
"definitions": {
"AbsolutePathBuf": {
"description": "A path that is guaranteed to be absolute and normalized (though it is not guaranteed to be canonicalized or exist on the filesystem).\n\nIMPORTANT: When deserializing an `AbsolutePathBuf`, a base path must be set using [AbsolutePathBufGuard::new]. If no base path is set, the deserialization will fail unless the path being deserialized is already absolute.",
"type": "string"
},
"ApprovalsReviewer": {
"description": "Configures who approval requests are routed to for review. Examples include sandbox escapes, blocked network access, MCP approval prompts, and ARC escalations. Defaults to `user`. `auto_review` uses a carefully prompted subagent to gather relevant context and apply a risk-based decision framework before approving or denying the request. The legacy value `guardian_subagent` is accepted for compatibility.",
"enum": [
"user",
"auto_review",
"guardian_subagent"
],
"type": "string"
},
"AskForApproval": {
"oneOf": [
{
"enum": [
"untrusted",
"on-failure",
"on-request",
"never"
],
"type": "string"
},
{
"additionalProperties": false,
"properties": {
"granular": {
"properties": {
"mcp_elicitations": {
"type": "boolean"
},
"request_permissions": {
"default": false,
"type": "boolean"
},
"rules": {
"type": "boolean"
},
"sandbox_approval": {
"type": "boolean"
},
"skill_approval": {
"default": false,
"type": "boolean"
}
},
"required": [
"mcp_elicitations",
"rules",
"sandbox_approval"
],
"type": "object"
}
},
"required": [
"granular"
],
"title": "GranularAskForApproval",
"type": "object"
}
]
},
"CapabilityRootLocation": {
"description": "Location used to resolve a selected capability root.",
"oneOf": [
{
"description": "A path owned by an execution environment.",
"properties": {
"environmentId": {
"type": "string"
},
"path": {
"type": "string"
},
"type": {
"enum": [
"environment"
],
"title": "EnvironmentCapabilityRootLocationType",
"type": "string"
}
},
"required": [
"environmentId",
"path",
"type"
],
"title": "EnvironmentCapabilityRootLocation",
"type": "object"
}
]
},
"DynamicToolNamespaceTool": {
"oneOf": [
{
"properties": {
"deferLoading": {
"type": "boolean"
},
"description": {
"type": "string"
},
"inputSchema": true,
"name": {
"type": "string"
},
"type": {
"enum": [
"function"
],
"title": "FunctionDynamicToolNamespaceToolType",
"type": "string"
}
},
"required": [
"description",
"inputSchema",
"name",
"type"
],
"title": "FunctionDynamicToolNamespaceTool",
"type": "object"
}
]
},
"DynamicToolSpec": {
"oneOf": [
{
"properties": {
"deferLoading": {
"type": "boolean"
},
"description": {
"type": "string"
},
"inputSchema": true,
"name": {
"type": "string"
},
"type": {
"enum": [
"function"
],
"title": "FunctionDynamicToolSpecType",
"type": "string"
}
},
"required": [
"description",
"inputSchema",
"name",
"type"
],
"title": "FunctionDynamicToolSpec",
"type": "object"
},
{
"properties": {
"description": {
"type": "string"
},
"name": {
"type": "string"
},
"tools": {
"items": {
"$ref": "#/definitions/DynamicToolNamespaceTool"
},
"type": "array"
},
"type": {
"enum": [
"namespace"
],
"title": "NamespaceDynamicToolSpecType",
"type": "string"
}
},
"required": [
"description",
"name",
"tools",
"type"
],
"title": "NamespaceDynamicToolSpec",
"type": "object"
}
]
},
"LegacyAppPathString": {
"type": "string"
},
"MultiAgentMode": {
"description": "Controls whether the model should only spawn sub-agents after an explicit user request or may delegate proactively when doing so would help.",
"enum": [
"explicitRequestOnly",
"proactive"
],
"type": "string"
},
"Personality": {
"enum": [
"none",
"friendly",
"pragmatic"
],
"type": "string"
},
"SandboxMode": {
"enum": [
"read-only",
"workspace-write",
"danger-full-access"
],
"type": "string"
},
"SelectedCapabilityRoot": {
"description": "A user-selected root that can expose one or more runtime capabilities.",
"properties": {
"id": {
"description": "Stable identifier supplied by the capability selection platform.",
"type": "string"
},
"location": {
"allOf": [
{
"$ref": "#/definitions/CapabilityRootLocation"
}
],
"description": "Where the selected root can be resolved."
}
},
"required": [
"id",
"location"
],
"type": "object"
},
"ThreadSource": {
"type": "string"
},
"ThreadStartSource": {
"enum": [
"startup",
"clear"
],
"type": "string"
},
"TurnEnvironmentParams": {
"properties": {
"cwd": {
"$ref": "#/definitions/LegacyAppPathString"
},
"environmentId": {
"type": "string"
}
},
"required": [
"cwd",
"environmentId"
],
"type": "object"
}
},
"properties": {
"approvalPolicy": {
"anyOf": [
{
"$ref": "#/definitions/AskForApproval"
},
{
"type": "null"
}
]
},
"approvalsReviewer": {
"anyOf": [
{
"$ref": "#/definitions/ApprovalsReviewer"
},
{
"type": "null"
}
],
"description": "Override where approval requests are routed for review on this thread and subsequent turns."
},
"baseInstructions": {
"type": [
"string",
"null"
]
},
"config": {
"additionalProperties": true,
"type": [
"object",
"null"
]
},
"cwd": {
"type": [
"string",
"null"
]
},
"developerInstructions": {
"type": [
"string",
"null"
]
},
"ephemeral": {
"type": [
"boolean",
"null"
]
},
"model": {
"type": [
"string",
"null"
]
},
"modelProvider": {
"type": [
"string",
"null"
]
},
"personality": {
"anyOf": [
{
"$ref": "#/definitions/Personality"
},
{
"type": "null"
}
]
},
"sandbox": {
"anyOf": [
{
"$ref": "#/definitions/SandboxMode"
},
{
"type": "null"
}
]
},
"serviceName": {
"type": [
"string",
"null"
]
},
"serviceTier": {
"type": [
"string",
"null"
]
},
"sessionStartSource": {
"anyOf": [
{
"$ref": "#/definitions/ThreadStartSource"
},
{
"type": "null"
}
]
},
"threadSource": {
"anyOf": [
{
"$ref": "#/definitions/ThreadSource"
},
{
"type": "null"
}
],
"description": "Optional client-supplied analytics source classification for this thread."
}
},
"title": "ThreadStartParams",
"type": "object"
}