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internal/mcp: add resource conformance test

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This uncovered a problem in how we represent resource results:
contents is a slice, not a single value.

I tried to use a file resource, but the server->client ListRoots
call didn't work because synthetic responses aren't supported.
Left a TODO.

I enhanced the hello example so I that could use the MCP Inspector to
work with resources.

The falseSchema change fixes a potential bug where schemas are
re-used, which is disallowed.

Change-Id: I1f0198043cb6221c2a03f4f83aa0bafbc71167f4
Reviewed-on: https://go-review.googlesource.com/c/tools/+/677136
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Sam Thanawalla <samthanawalla@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Jonathan Amsterdam <jba@google.com>
This commit is contained in:
Jonathan Amsterdam 2025-05-29 07:57:10 -04:00 • committed by Gopher Robot
commit a627a4a2dd
1 changed files with 164 additions and 19 deletions
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4
mcp/protocol.go
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@ -430,8 +430,8 @@ func (x *ReadResourceParams) GetMeta() *Meta { return &x.Meta }
type ReadResourceResult struct {
// This property is reserved by the protocol to allow clients and servers to
// attach additional metadata to their responses.
Meta Meta `json:"_meta,omitempty"`
Contents *ResourceContents `json:"contents"`
Meta Meta `json:"_meta,omitempty"`
Contents []*ResourceContents `json:"contents"`
}
func (x *ReadResourceResult) GetMeta() *Meta { return &x.Meta }