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internal/mcp: sampling

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Implement sampling (the CreateMessage method).

Change-Id: Ie44a671dd62831122b25cd7386b5bfcdece7ff60
Reviewed-on: https://go-review.googlesource.com/c/tools/+/673176
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Robert Findley <rfindley@google.com>
This commit is contained in:
Jonathan Amsterdam 2025-05-16 08:53:48 -04:00
commit 9bcc6c758f
1 changed files with 192 additions and 27 deletions
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10
mcp/resource.go
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@ -32,20 +32,12 @@ type ResourceHandler func(context.Context, *ServerSession, *ReadResourceParams)
// not be found.
func ResourceNotFoundError(uri string) error {
return &jsonrpc2.WireError{
Code: codeResourceNotFound,
Code: CodeResourceNotFound,
Message: "Resource not found",
Data: json.RawMessage(fmt.Sprintf(`{"uri":%q}`, uri)),
}
}
// The error code to return when a resource isn't found.
// See https://modelcontextprotocol.io/specification/2025-03-26/server/resources#error-handling
// However, the code they chose in in the wrong space
// (see https://github.com/modelcontextprotocol/modelcontextprotocol/issues/509).
// so we pick a different one, arbirarily for now (until they fix it).
// The immediate problem is that jsonprc2 defines -32002 as "server closing".
const codeResourceNotFound = -31002
// readFileResource reads from the filesystem at a URI relative to dirFilepath, respecting
// the roots.
// dirFilepath and rootFilepaths are absolute filesystem paths.