Files
codex/codex-rs/app-server-protocol/schema/json/v2/TurnStartParams.json
rhan-oai dc4e54d061 Restore legacy image detail values (#24644)
## Why

Older persisted rollouts can contain `input_image.detail` values of
`auto` or `low` from before `ImageDetail` was narrowed to
`high`/`original`. Current deserialization rejects those values, which
can make resume skip later compacted checkpoints and reconstruct an
oversized raw suffix before the next compaction attempt.

Confirmed Sentry reports fixed by this compatibility path:

- [CODEX-1H3F](https://openai.sentry.io/issues/7500642496/)
- [CODEX-1H6N](https://openai.sentry.io/issues/7501025347/)
- [CODEX-1JDP](https://openai.sentry.io/issues/7504549065/)
- [CODEX-1HW6](https://openai.sentry.io/issues/7503407986/)

## Background

[openai/codex#20693](https://github.com/openai/codex/pull/20693) added
image-detail plumbing for app-server `UserInput` so input images could
explicitly request `detail: original`. The Slack discussion behind that
PR was about ScreenSpot / bridge evals where user input images were
resized, while tool output images already had MCP/code-mode ways to
request image detail.

In review, the intended new API surface was narrowed to `high` and
`original`: default to `high`, allow `original` when callers need
unchanged image handling, and avoid encouraging new `auto` or `low`
usage. That policy still makes sense for newly emitted values.

The missing compatibility piece is persisted history. Older rollouts can
already contain `auto` and `low`, and resume reconstructs typed history
by deserializing those rollout records. Rejecting old values at that
boundary causes valid compacted checkpoints to be skipped. This PR
restores `auto` and `low` as real variants so old records deserialize
and round-trip without being rewritten as `high`, while product paths
can continue to default to `high` and avoid emitting `auto` for new
behavior.

## What changed

- Restored `ImageDetail::Auto` and `ImageDetail::Low` as first-class
protocol values.
- Preserved `auto`/`low` through rollout deserialization, MCP image
metadata, code-mode image output, and schema/type generation.
- Kept local image byte handling conservative: only `original` switches
to original-resolution loading; `auto`/`low`/`high` continue through the
resize-to-fit path while retaining their detail value.
- Added regression coverage for enum round-tripping and code-mode `low`
detail handling.

## Testing

- `just write-app-server-schema`
- `just test -p codex-protocol`
- `just test -p codex-tools`
- `just test -p codex-code-mode`
- `just test -p codex-app-server-protocol`
- `just test -p codex-core
suite::rmcp_client::stdio_image_responses_preserve_original_detail_metadata`
- `just test -p codex-core
suite::code_mode::code_mode_can_use_mcp_image_result_with_image_helper`
- Loaded broken rollouts on local fixed builds, and started/completed
new turns.

I also attempted `just test -p codex-core`; the local broad run did not
finish green: 2559 tests run, 2467 passed, 55 flaky, 91 failed, 1 timed
out. The failures were broad timeout/deadline failures across unrelated
areas; targeted changed-path core tests above passed.
2026-05-26 16:24:33 -07:00

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{
"$schema": "http://json-schema.org/draft-07/schema#",
"definitions": {
"AbsolutePathBuf": {
"description": "A path that is guaranteed to be absolute and normalized (though it is not guaranteed to be canonicalized or exist on the filesystem).\n\nIMPORTANT: When deserializing an `AbsolutePathBuf`, a base path must be set using [AbsolutePathBufGuard::new]. If no base path is set, the deserialization will fail unless the path being deserialized is already absolute.",
"type": "string"
},
"AdditionalContextEntry": {
"properties": {
"kind": {
"$ref": "#/definitions/AdditionalContextKind"
},
"value": {
"type": "string"
}
},
"required": [
"kind",
"value"
],
"type": "object"
},
"AdditionalContextKind": {
"enum": [
"untrusted",
"application"
],
"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"
}
]
},
"ByteRange": {
"properties": {
"end": {
"format": "uint",
"minimum": 0.0,
"type": "integer"
},
"start": {
"format": "uint",
"minimum": 0.0,
"type": "integer"
}
},
"required": [
"end",
"start"
],
"type": "object"
},
"CollaborationMode": {
"description": "Collaboration mode for a Codex session.",
"properties": {
"mode": {
"$ref": "#/definitions/ModeKind"
},
"settings": {
"$ref": "#/definitions/Settings"
}
},
"required": [
"mode",
"settings"
],
"type": "object"
},
"ImageDetail": {
"enum": [
"auto",
"low",
"high",
"original"
],
"type": "string"
},
"ModeKind": {
"description": "Initial collaboration mode to use when the TUI starts.",
"enum": [
"plan",
"default"
],
"type": "string"
},
"NetworkAccess": {
"enum": [
"restricted",
"enabled"
],
"type": "string"
},
"Personality": {
"enum": [
"none",
"friendly",
"pragmatic"
],
"type": "string"
},
"ReasoningEffort": {
"description": "See https://platform.openai.com/docs/guides/reasoning?api-mode=responses#get-started-with-reasoning",
"enum": [
"none",
"minimal",
"low",
"medium",
"high",
"xhigh"
],
"type": "string"
},
"ReasoningSummary": {
"description": "A summary of the reasoning performed by the model. This can be useful for debugging and understanding the model's reasoning process. See https://platform.openai.com/docs/guides/reasoning?api-mode=responses#reasoning-summaries",
"oneOf": [
{
"enum": [
"auto",
"concise",
"detailed"
],
"type": "string"
},
{
"description": "Option to disable reasoning summaries.",
"enum": [
"none"
],
"type": "string"
}
]
},
"SandboxPolicy": {
"oneOf": [
{
"properties": {
"type": {
"enum": [
"dangerFullAccess"
],
"title": "DangerFullAccessSandboxPolicyType",
"type": "string"
}
},
"required": [
"type"
],
"title": "DangerFullAccessSandboxPolicy",
"type": "object"
},
{
"properties": {
"networkAccess": {
"default": false,
"type": "boolean"
},
"type": {
"enum": [
"readOnly"
],
"title": "ReadOnlySandboxPolicyType",
"type": "string"
}
},
"required": [
"type"
],
"title": "ReadOnlySandboxPolicy",
"type": "object"
},
{
"properties": {
"networkAccess": {
"allOf": [
{
"$ref": "#/definitions/NetworkAccess"
}
],
"default": "restricted"
},
"type": {
"enum": [
"externalSandbox"
],
"title": "ExternalSandboxSandboxPolicyType",
"type": "string"
}
},
"required": [
"type"
],
"title": "ExternalSandboxSandboxPolicy",
"type": "object"
},
{
"properties": {
"excludeSlashTmp": {
"default": false,
"type": "boolean"
},
"excludeTmpdirEnvVar": {
"default": false,
"type": "boolean"
},
"networkAccess": {
"default": false,
"type": "boolean"
},
"type": {
"enum": [
"workspaceWrite"
],
"title": "WorkspaceWriteSandboxPolicyType",
"type": "string"
},
"writableRoots": {
"default": [],
"items": {
"$ref": "#/definitions/AbsolutePathBuf"
},
"type": "array"
}
},
"required": [
"type"
],
"title": "WorkspaceWriteSandboxPolicy",
"type": "object"
}
]
},
"Settings": {
"description": "Settings for a collaboration mode.",
"properties": {
"developer_instructions": {
"type": [
"string",
"null"
]
},
"model": {
"type": "string"
},
"reasoning_effort": {
"anyOf": [
{
"$ref": "#/definitions/ReasoningEffort"
},
{
"type": "null"
}
]
}
},
"required": [
"model"
],
"type": "object"
},
"TextElement": {
"properties": {
"byteRange": {
"allOf": [
{
"$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"
},
"TurnEnvironmentParams": {
"properties": {
"cwd": {
"$ref": "#/definitions/AbsolutePathBuf"
},
"environmentId": {
"type": "string"
}
},
"required": [
"cwd",
"environmentId"
],
"type": "object"
},
"UserInput": {
"oneOf": [
{
"properties": {
"text": {
"type": "string"
},
"text_elements": {
"default": [],
"description": "UI-defined spans within `text` used to render or persist special elements.",
"items": {
"$ref": "#/definitions/TextElement"
},
"type": "array"
},
"type": {
"enum": [
"text"
],
"title": "TextUserInputType",
"type": "string"
}
},
"required": [
"text",
"type"
],
"title": "TextUserInput",
"type": "object"
},
{
"properties": {
"detail": {
"anyOf": [
{
"$ref": "#/definitions/ImageDetail"
},
{
"type": "null"
}
],
"default": null
},
"type": {
"enum": [
"image"
],
"title": "ImageUserInputType",
"type": "string"
},
"url": {
"type": "string"
}
},
"required": [
"type",
"url"
],
"title": "ImageUserInput",
"type": "object"
},
{
"properties": {
"detail": {
"anyOf": [
{
"$ref": "#/definitions/ImageDetail"
},
{
"type": "null"
}
],
"default": null
},
"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": {
"approvalPolicy": {
"anyOf": [
{
"$ref": "#/definitions/AskForApproval"
},
{
"type": "null"
}
],
"description": "Override the approval policy for this turn and subsequent turns."
},
"approvalsReviewer": {
"anyOf": [
{
"$ref": "#/definitions/ApprovalsReviewer"
},
{
"type": "null"
}
],
"description": "Override where approval requests are routed for review on this turn and subsequent turns."
},
"cwd": {
"description": "Override the working directory for this turn and subsequent turns.",
"type": [
"string",
"null"
]
},
"effort": {
"anyOf": [
{
"$ref": "#/definitions/ReasoningEffort"
},
{
"type": "null"
}
],
"description": "Override the reasoning effort for this turn and subsequent turns."
},
"input": {
"items": {
"$ref": "#/definitions/UserInput"
},
"type": "array"
},
"model": {
"description": "Override the model for this turn and subsequent turns.",
"type": [
"string",
"null"
]
},
"outputSchema": {
"description": "Optional JSON Schema used to constrain the final assistant message for this turn."
},
"personality": {
"anyOf": [
{
"$ref": "#/definitions/Personality"
},
{
"type": "null"
}
],
"description": "Override the personality for this turn and subsequent turns."
},
"sandboxPolicy": {
"anyOf": [
{
"$ref": "#/definitions/SandboxPolicy"
},
{
"type": "null"
}
],
"description": "Override the sandbox policy for this turn and subsequent turns."
},
"serviceTier": {
"description": "Override the service tier for this turn and subsequent turns.",
"type": [
"string",
"null"
]
},
"summary": {
"anyOf": [
{
"$ref": "#/definitions/ReasoningSummary"
},
{
"type": "null"
}
],
"description": "Override the reasoning summary for this turn and subsequent turns."
},
"threadId": {
"type": "string"
}
},
"required": [
"input",
"threadId"
],
"title": "TurnStartParams",
"type": "object"
}