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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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6
examples/server/completion/main.go
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@ -16,17 +16,17 @@ import (
// a CompletionHandler to an MCP Server's options.
func main() {
// Define your custom CompletionHandler logic.
myCompletionHandler := func(_ context.Context, _ *mcp.ServerSession, params *mcp.CompleteParams) (*mcp.CompleteResult, error) {
myCompletionHandler := func(_ context.Context, req *mcp.ServerRequest[*mcp.CompleteParams]) (*mcp.CompleteResult, error) {
// In a real application, you'd implement actual completion logic here.
// For this example, we return a fixed set of suggestions.
var suggestions []string
switch params.Ref.Type {
switch req.Params.Ref.Type {
case "ref/prompt":
suggestions = []string{"suggestion1", "suggestion2", "suggestion3"}
case "ref/resource":
suggestions = []string{"suggestion4", "suggestion5", "suggestion6"}
default:
return nil, fmt.Errorf("unrecognized content type %s", params.Ref.Type)
return nil, fmt.Errorf("unrecognized content type %s", req.Params.Ref.Type)
}
return &mcp.CompleteResult{