feat(ai/mcp): expose serverInfo from MCP initialize handshake#13825
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alexzurbonsen wants to merge 4 commits intovercel:mainfrom
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feat(ai/mcp): expose serverInfo from MCP initialize handshake#13825alexzurbonsen wants to merge 4 commits intovercel:mainfrom
serverInfo from MCP initialize handshake#13825alexzurbonsen wants to merge 4 commits intovercel:mainfrom
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`MCPClient` now exposes the server's `serverInfo` (containing `name`, `version`, and optional `title`) as a readonly property. Previously, this was parsed during initialization but discarded. Signed-off-by: Alexander zur Bonsen <alexander.zur.bonsen@tngtech.com>
Signed-off-by: Alexander zur Bonsen <alexander.zur.bonsen@tngtech.com>
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@aayush-kapoor or @lgrammel: could you give this PR a review? You have touched some of the files before. Thank you :) |
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could you link to the official docs as a reference? |
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Sure, I updated the PR description. |
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there wwre just a couple of things that i wanted to change so have continued this in #14288. will mark this as closed - thanks for raising!
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## Background introduced in #13825 we used to capture the `serverInfo` in the schema but never surface it through to the client. only `result.capabilities` was stored and `result.serverInfo` was thrown away. there was no field on the client to hold it and no property on the MCPClient interface to access it ## Summary - added `title` field to `ClientOrServerImplementationSchema` to align with [MCP spec](https://modelcontextprotocol.io/specification/2025-11-25/schema#implementation) - exposed `serverInfo` via a getter function ## Manual Verification verified by running the client and server under `examples/mcp/src/server-info` ## Checklist - [x] Tests have been added / updated (for bug fixes / features) - [ ] Documentation has been added / updated (for bug fixes / features) - [x] A _patch_ changeset for relevant packages has been added (for bug fixes / features - run `pnpm changeset` in the project root) - [x] I have reviewed this pull request (self-review)
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## Background introduced in #13825 we used to capture the `serverInfo` in the schema but never surface it through to the client. only `result.capabilities` was stored and `result.serverInfo` was thrown away. there was no field on the client to hold it and no property on the MCPClient interface to access it ## Summary - added `title` field to `ClientOrServerImplementationSchema` to align with [MCP spec](https://modelcontextprotocol.io/specification/2025-11-25/schema#implementation) - exposed `serverInfo` via a getter function ## Manual Verification verified by running the client and server under `examples/mcp/src/server-info` ## Checklist - [x] Tests have been added / updated (for bug fixes / features) - [ ] Documentation has been added / updated (for bug fixes / features) - [x] A _patch_ changeset for relevant packages has been added (for bug fixes / features - run `pnpm changeset` in the project root) - [x] I have reviewed this pull request (self-review)
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Background
Motivation: I would like to use the title (name respectively) in a UI.
Summary
Exposes the MCP server's
serverInfo(containingname,version, and optionaltitle) as a readonly property on ai sdk'sMCPClient. Previously, this was parsed during initialization but discarded.MCP Specs:
The (spec page)[https://modelcontextprotocol.io/specification/2025-11-25] lists (schema.ts)[https://github.com/modelcontextprotocol/modelcontextprotocol/blob/a0d7bf599d56dfc0c73a2752dc68995bf0e72bb8/schema/2025-11-25/schema.ts#L530] as authoritative reference.
The
Implementationtype is defined here:https://github.com/modelcontextprotocol/modelcontextprotocol/blob/a0d7bf599d56dfc0c73a2752dc68995bf0e72bb8/schema/2025-11-25/schema.ts#L552
and used in:
clientInfo: https://github.com/modelcontextprotocol/modelcontextprotocol/blob/a0d7bf599d56dfc0c73a2752dc68995bf0e72bb8/schema/2025-11-25/schema.ts#L263serverInfo: https://github.com/modelcontextprotocol/modelcontextprotocol/blob/a0d7bf599d56dfc0c73a2752dc68995bf0e72bb8/schema/2025-11-25/schema.ts#L287Manual Verification
From
examples/mcprun the examples from the second commit of this branch.Terminal 1:
pnpm tsx src/server-info/server.tsTerminal 2:
pnpm tsx src/server-info/client.tsSee the client logging
serverInfo: { name: 'my-weather-server', version: '2.1.0' }Checklist
pnpm changesetin the project root)Related Issues