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mcp: make transports open structs

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As described in #272, there is really no reason for transports to be
closed structs with constructors, since their state must be established
by a call to Connect. Making them open structs simplifies their APIs,
and means that all transports can be extended in the future: we don't
have to create empty Options structs just for the purpose of future
compatibility.

For now, the related constructors and options structs are simply
deprecated (with go:fix directives where possible). A future CL will
remove them prior to the v1.0.0 release.

For #272
This commit is contained in:
Robert Findley 2025-08-12 15:14:21 -04:00 • committed by GitHub
commit e097918484
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1 changed files with 307 additions and 251 deletions
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README.md
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@ -73,7 +73,7 @@ func main() {
client := mcp.NewClient(&mcp.Implementation{Name: "mcp-client", Version: "v1.0.0"}, nil)
// Connect to a server over stdin/stdout
transport := mcp.NewCommandTransport(exec.Command("myserver"))
transport := &mcp.CommandTransport{Command: exec.Command("myserver")}
session, err := client.Connect(ctx, transport, nil)
if err != nil {
log.Fatal(err)
@ -127,7 +127,7 @@ func main() {
mcp.AddTool(server, &mcp.Tool{Name: "greet", Description: "say hi"}, SayHi)
// Run the server over stdin/stdout, until the client disconnects
if err := server.Run(context.Background(), mcp.NewStdioTransport()); err != nil {
if err := server.Run(context.Background(), &mcp.StdioTransport{}); err != nil {
log.Fatal(err)
}
}