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mcp: introduce Requests (#267)

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Handlers and client/server methods take a single request argument
combining the session and params. This slightly simplifies the signature
for handlers, since there is no longer an often-ignored session
argument.

But more importantly, it opens the door to adding more information in
requests, such as auth info and HTTP request headers.

For #243.
This commit is contained in:
Jonathan Amsterdam 2025-08-12 17:49:50 -04:00 • committed by GitHub
commit 6e03217c83
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1 changed files with 517 additions and 380 deletions
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10
examples/server/hello/main.go
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@ -22,10 +22,10 @@ type HiArgs struct {
Name string `json:"name" jsonschema:"the name to say hi to"`
}
func SayHi(ctx context.Context, ss *mcp.ServerSession, params *mcp.CallToolParamsFor[HiArgs]) (*mcp.CallToolResultFor[struct{}], error) {
func SayHi(ctx context.Context, req *mcp.ServerRequest[*mcp.CallToolParamsFor[HiArgs]]) (*mcp.CallToolResultFor[struct{}], error) {
return &mcp.CallToolResultFor[struct{}]{
Content: []mcp.Content{
&mcp.TextContent{Text: "Hi " + params.Arguments.Name},
&mcp.TextContent{Text: "Hi " + req.Params.Arguments.Name},
},
}, nil
}
@ -69,8 +69,8 @@ var embeddedResources = map[string]string{
"info": "This is the hello example server.",
}
func handleEmbeddedResource(_ context.Context, _ *mcp.ServerSession, params *mcp.ReadResourceParams) (*mcp.ReadResourceResult, error) {
u, err := url.Parse(params.URI)
func handleEmbeddedResource(_ context.Context, req *mcp.ServerRequest[*mcp.ReadResourceParams]) (*mcp.ReadResourceResult, error) {
u, err := url.Parse(req.Params.URI)
if err != nil {
return nil, err
}
@ -84,7 +84,7 @@ func handleEmbeddedResource(_ context.Context, _ *mcp.ServerSession, params *mcp
}
return &mcp.ReadResourceResult{
Contents: []*mcp.ResourceContents{
{URI: params.URI, MIMEType: "text/plain", Text: text},
{URI: req.Params.URI, MIMEType: "text/plain", Text: text},
},
}, nil
}