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feat: replace custom mcp-types crate with equivalents from rmcp (#10349)

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We started working with MCP in Codex before
https://crates.io/crates/rmcp was mature, so we had our own crate for
MCP types that was generated from the MCP schema:


8b95d3e082/codex-rs/mcp-types/README.md

Now that `rmcp` is more mature, it makes more sense to use their MCP
types in Rust, as they handle details (like the `_meta` field) that our
custom version ignored. Though one advantage that our custom types had
is that our generated types implemented `JsonSchema` and `ts_rs::TS`,
whereas the types in `rmcp` do not. As such, part of the work of this PR
is leveraging the adapters between `rmcp` types and the serializable
types that are API for us (app server and MCP) introduced in #10356.

Note this PR results in a number of changes to
`codex-rs/app-server-protocol/schema`, which merit special attention
during review. We must ensure that these changes are still
backwards-compatible, which is possible because we have:

```diff
- export type CallToolResult = { content: Array<ContentBlock>, isError?: boolean, structuredContent?: JsonValue, };
+ export type CallToolResult = { content: Array<JsonValue>, structuredContent?: JsonValue, isError?: boolean, _meta?: JsonValue, };
```

so `ContentBlock` has been replaced with the more general `JsonValue`.
Note that `ContentBlock` was defined as:

```typescript
export type ContentBlock = TextContent | ImageContent | AudioContent | ResourceLink | EmbeddedResource;
```

so the deletion of those individual variants should not be a cause of
great concern.

Similarly, we have the following change in
`codex-rs/app-server-protocol/schema/typescript/Tool.ts`:

```
- export type Tool = { annotations?: ToolAnnotations, description?: string, inputSchema: ToolInputSchema, name: string, outputSchema?: ToolOutputSchema, title?: string, };
+ export type Tool = { name: string, title?: string, description?: string, inputSchema: JsonValue, outputSchema?: JsonValue, annotations?: JsonValue, icons?: Array<JsonValue>, _meta?: JsonValue, };
```

so:

- `annotations?: ToolAnnotations` ➡️ `JsonValue`
- `inputSchema: ToolInputSchema` ➡️ `JsonValue`
- `outputSchema?: ToolOutputSchema` ➡️ `JsonValue`

and two new fields: `icons?: Array<JsonValue>, _meta?: JsonValue`

---
[//]: # (BEGIN SAPLING FOOTER)
Stack created with [Sapling](https://sapling-scm.com). Best reviewed
with [ReviewStack](https://reviewstack.dev/openai/codex/pull/10349).
* #10357
* __->__ #10349
* #10356
This commit is contained in:
Michael Bolin
2026-02-02 17:41:55 -08:00
committed by GitHub
parent 8f5edddf71
commit 66447d5d2c
92 changed files with 1629 additions and 8273 deletions
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420
codex-rs/app-server-protocol/schema/json/EventMsg.json
View File

@@ -93,34 +93,6 @@
}
]
},
"Annotations": {
"description": "Optional annotations for the client. The client can use annotations to inform how objects are used or displayed",
"properties": {
"audience": {
"items": {
"$ref": "#/definitions/Role"
},
"type": [
"array",
"null"
]
},
"lastModified": {
"type": [
"string",
"null"
]
},
"priority": {
"format": "double",
"type": [
"number",
"null"
]
}
},
"type": "object"
},
"AskForApproval": {
"description": "Determines the conditions under which the user is consulted to approve running the command proposed by Codex.",
"oneOf": [
@@ -154,57 +126,6 @@
}
]
},
"AudioContent": {
"description": "Audio provided to or from an LLM.",
"properties": {
"annotations": {
"anyOf": [
{
"$ref": "#/definitions/Annotations"
},
{
"type": "null"
}
]
},
"data": {
"type": "string"
},
"mimeType": {
"type": "string"
},
"type": {
"type": "string"
}
},
"required": [
"data",
"mimeType",
"type"
],
"type": "object"
},
"BlobResourceContents": {
"properties": {
"blob": {
"type": "string"
},
"mimeType": {
"type": [
"string",
"null"
]
},
"uri": {
"type": "string"
}
},
"required": [
"blob",
"uri"
],
"type": "object"
},
"ByteRange": {
"properties": {
"end": {
@@ -229,10 +150,9 @@
"CallToolResult": {
"description": "The server's response to a tool call.",
"properties": {
"_meta": true,
"content": {
"items": {
"$ref": "#/definitions/ContentBlock"
},
"items": true,
"type": "array"
},
"isError": {
@@ -390,25 +310,6 @@
}
]
},
"ContentBlock": {
"anyOf": [
{
"$ref": "#/definitions/TextContent"
},
{
"$ref": "#/definitions/ImageContent"
},
{
"$ref": "#/definitions/AudioContent"
},
{
"$ref": "#/definitions/ResourceLink"
},
{
"$ref": "#/definitions/EmbeddedResource"
}
]
},
"ContentItem": {
"oneOf": [
{
@@ -544,42 +445,6 @@
],
"type": "object"
},
"EmbeddedResource": {
"description": "The contents of a resource, embedded into a prompt or tool call result.\n\nIt is up to the client how best to render embedded resources for the benefit of the LLM and/or the user.",
"properties": {
"annotations": {
"anyOf": [
{
"$ref": "#/definitions/Annotations"
},
{
"type": "null"
}
]
},
"resource": {
"$ref": "#/definitions/EmbeddedResourceResource"
},
"type": {
"type": "string"
}
},
"required": [
"resource",
"type"
],
"type": "object"
},
"EmbeddedResourceResource": {
"anyOf": [
{
"$ref": "#/definitions/TextResourceContents"
},
{
"$ref": "#/definitions/BlobResourceContents"
}
]
},
"EventMsg": {
"description": "Response event from the agent NOTE: Make sure none of these values have optional types, as it will mess up the extension code-gen.",
"oneOf": [
@@ -3071,36 +2936,6 @@
],
"type": "object"
},
"ImageContent": {
"description": "An image provided to or from an LLM.",
"properties": {
"annotations": {
"anyOf": [
{
"$ref": "#/definitions/Annotations"
},
{
"type": "null"
}
]
},
"data": {
"type": "string"
},
"mimeType": {
"type": "string"
},
"type": {
"type": "string"
}
},
"required": [
"data",
"mimeType",
"type"
],
"type": "object"
},
"LocalShellAction": {
"oneOf": [
{
@@ -3599,7 +3434,8 @@
"format": "int64",
"type": "integer"
}
]
],
"description": "ID of a request, which can be either a string or an integer."
},
"RequestUserInputQuestion": {
"properties": {
@@ -3655,22 +3491,21 @@
"Resource": {
"description": "A known resource that the server is capable of reading.",
"properties": {
"annotations": {
"anyOf": [
{
"$ref": "#/definitions/Annotations"
},
{
"type": "null"
}
]
},
"_meta": true,
"annotations": true,
"description": {
"type": [
"string",
"null"
]
},
"icons": {
"items": true,
"type": [
"array",
"null"
]
},
"mimeType": {
"type": [
"string",
@@ -3703,74 +3538,10 @@
],
"type": "object"
},
"ResourceLink": {
"description": "A resource that the server is capable of reading, included in a prompt or tool call result.\n\nNote: resource links returned by tools are not guaranteed to appear in the results of `resources/list` requests.",
"properties": {
"annotations": {
"anyOf": [
{
"$ref": "#/definitions/Annotations"
},
{
"type": "null"
}
]
},
"description": {
"type": [
"string",
"null"
]
},
"mimeType": {
"type": [
"string",
"null"
]
},
"name": {
"type": "string"
},
"size": {
"format": "int64",
"type": [
"integer",
"null"
]
},
"title": {
"type": [
"string",
"null"
]
},
"type": {
"type": "string"
},
"uri": {
"type": "string"
}
},
"required": [
"name",
"type",
"uri"
],
"type": "object"
},
"ResourceTemplate": {
"description": "A template description for resources available on the server.",
"properties": {
"annotations": {
"anyOf": [
{
"$ref": "#/definitions/Annotations"
},
{
"type": "null"
}
]
},
"annotations": true,
"description": {
"type": [
"string",
@@ -4361,14 +4132,6 @@
}
]
},
"Role": {
"description": "The sender or recipient of messages and data in a conversation.",
"enum": [
"assistant",
"user"
],
"type": "string"
},
"SandboxPolicy": {
"description": "Determines execution restrictions for model shell commands.",
"oneOf": [
@@ -4678,32 +4441,6 @@
],
"type": "string"
},
"TextContent": {
"description": "Text provided to or from an LLM.",
"properties": {
"annotations": {
"anyOf": [
{
"$ref": "#/definitions/Annotations"
},
{
"type": "null"
}
]
},
"text": {
"type": "string"
},
"type": {
"type": "string"
}
},
"required": [
"text",
"type"
],
"type": "object"
},
"TextElement": {
"properties": {
"byte_range": {
@@ -4727,27 +4464,6 @@
],
"type": "object"
},
"TextResourceContents": {
"properties": {
"mimeType": {
"type": [
"string",
"null"
]
},
"text": {
"type": "string"
},
"uri": {
"type": "string"
}
},
"required": [
"text",
"uri"
],
"type": "object"
},
"ThreadId": {
"type": "string"
},
@@ -4808,38 +4524,26 @@
"Tool": {
"description": "Definition for a tool the client can call.",
"properties": {
"annotations": {
"anyOf": [
{
"$ref": "#/definitions/ToolAnnotations"
},
{
"type": "null"
}
]
},
"_meta": true,
"annotations": true,
"description": {
"type": [
"string",
"null"
]
},
"inputSchema": {
"$ref": "#/definitions/ToolInputSchema"
"icons": {
"items": true,
"type": [
"array",
"null"
]
},
"inputSchema": true,
"name": {
"type": "string"
},
"outputSchema": {
"anyOf": [
{
"$ref": "#/definitions/ToolOutputSchema"
},
{
"type": "null"
}
]
},
"outputSchema": true,
"title": {
"type": [
"string",
@@ -4853,82 +4557,6 @@
],
"type": "object"
},
"ToolAnnotations": {
"description": "Additional properties describing a Tool to clients.\n\nNOTE: all properties in ToolAnnotations are **hints**. They are not guaranteed to provide a faithful description of tool behavior (including descriptive properties like `title`).\n\nClients should never make tool use decisions based on ToolAnnotations received from untrusted servers.",
"properties": {
"destructiveHint": {
"type": [
"boolean",
"null"
]
},
"idempotentHint": {
"type": [
"boolean",
"null"
]
},
"openWorldHint": {
"type": [
"boolean",
"null"
]
},
"readOnlyHint": {
"type": [
"boolean",
"null"
]
},
"title": {
"type": [
"string",
"null"
]
}
},
"type": "object"
},
"ToolInputSchema": {
"description": "A JSON Schema object defining the expected parameters for the tool.",
"properties": {
"properties": true,
"required": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"type": {
"default": "object",
"type": "string"
}
},
"type": "object"
},
"ToolOutputSchema": {
"description": "An optional JSON Schema object defining the structure of the tool's output returned in the structuredContent field of a CallToolResult.",
"properties": {
"properties": true,
"required": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"type": {
"default": "object",
"type": "string"
}
},
"type": "object"
},
"TurnAbortReason": {
"enum": [
"interrupted",