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mcp,design: revert 'content' back to an interface type (#29)

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After some experience with the flattened version of Content, we see that
it can easily lead to incorrect usage and is a harder API to read.
Therefore, this CL changes back to a design similar to what we had prior
to https://go.dev/cl/672415, though opting to promote content
unmarshalling to the protocol types that use it, which leads to an
overall simpler api.
This commit is contained in:
Robert Findley 2025-06-25 13:09:05 -04:00 • committed by GitHub
commit 204b59483b
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1 changed files with 333 additions and 159 deletions
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10
examples/hello/main.go
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@ -24,8 +24,8 @@ type HiArgs struct {
func SayHi(ctx context.Context, ss *mcp.ServerSession, params *mcp.CallToolParamsFor[HiArgs]) (*mcp.CallToolResultFor[struct{}], error) {
return &mcp.CallToolResultFor[struct{}]{
Content: []*mcp.ContentBlock{
mcp.NewTextContent("Hi " + params.Name),
Content: []mcp.Content{
&mcp.TextContent{Text: "Hi " + params.Name},
},
}, nil
}
@ -36,7 +36,7 @@ func PromptHi(ctx context.Context, ss *mcp.ServerSession, params *mcp.GetPromptP
return &mcp.GetPromptResult{
Description: "Code review prompt",
Messages: []*mcp.PromptMessage{
{Role: "user", Content: mcp.NewTextContent("Say hi to " + params.Arguments["name"])},
{Role: "user", Content: &mcp.TextContent{Text: "Say hi to " + params.Arguments["name"]}},
},
}, nil
}
@ -93,6 +93,8 @@ func handleEmbeddedResource(_ context.Context, _ *mcp.ServerSession, params *mcp
return nil, fmt.Errorf("no embedded resource named %q", key)
}
return &mcp.ReadResourceResult{
Contents: []*mcp.ResourceContents{mcp.NewTextResourceContents(params.URI, "text/plain", text)},
Contents: []*mcp.ResourceContents{
{URI: params.URI, MIMEType: "text/plain", Text: text},
},
}, nil
}