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feat(mcp): let embedders extend the /mcp server - #3495
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Adds app.Options.MCPExtensions, a hook that runs after core registers its tools. A program that runs core as a library can add tools, resources and resource templates, which are served from the same endpoint behind the same authenticator. The hook gets a narrow registry rather than the MCP server. Startup fails on a name, URI or URI template that core or an earlier call already registered, and on input the registry rejects. Refs kagent-dev#3429 Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Signed-off-by: Alan Bentley <alanbentleypgh@gmail.com>
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Open WebUI calling a tool added through the hook ( reel-hook-1600.mp4🤖 written by Claude |
alan-bentley-pgh
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November 2, 2026 20:58
EItanya
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Nov 2, 2026
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Frankly I think this is overcomplicated. Can we just expose the underlying server to the extension after it's done being created and let it do what it wants?
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Sure, that seems like a simpler approach. I'll pass the created *mcp.Server to the hook after core registers its tools and drop the registry
MCPExtensions now receives the *mcp.Server after core registers its tools, instead of a narrow registry. This drops the registry, the in-memory listing of core's names and the panic wrapper. Refs kagent-dev#3429 Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Signed-off-by: Alan Bentley <alanbentleypgh@gmail.com>
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🤖 written by Claude (start)
This PR adds
app.Options.MCPExtensions, which hands core's*mcp.Serverto a program that runs core as a library, after core registers its own tools. The program can add tools, resources and middleware that share core's endpoint and authenticator.Core's tools are not protected: the SDK replaces a name or URI that is registered twice.
Closes #3429
🤖 written by Claude (end)