Distrib2 #2
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Update inaccurate doc comment for ClientSession.
…#236) - Correct MethodHandler type parameter to use fully qualified mcp.ServerSession - Update parameter types to use proper mcp.Params and mcp.Result instead of any - Ensure example code matches the actual API
This CL makes the following changes to our Github workflows, motivated by modelcontextprotocol#227: - Add -race tests. - Add go1.25rc2 to the build matrix. - Check out code before setting up Go, so that the setup step can use dependency caching.
As reported in modelcontextprotocol#227, there was a race where streams could be terminated before the final reply was written. Fix this by checking the number of outstanding requests in the same critical section that acquires outgoing messages to write. Fixes modelcontextprotocol#227
Test that explicit nulls don't cause panics.
Add ForType, which is like For but takes a reflect.Type. Fixes modelcontextprotocol#233.
Use a read loop and incoming channel so that we can select on incoming messages and unblock calls of ioConn.Read as soon as Close is called. This avoids the scenario of modelcontextprotocol#224, where a close of the StdioTransport does not gracefully shut down the JSON-RPC connection. Fixes modelcontextprotocol#224
…#179) (modelcontextprotocol#192) You can make MCP server log error, send response and then abruptly exit, with a json input malformed at the end. While using json.RawMessage, once a valid first json is decoded, trailing bad input is silently ignored. Without graciously handling this input, mcp server is currently sending response as well as encountering error. It should just report error without further processing of request. Fixes modelcontextprotocol#179.
Marshal the empty schema to true, and its negation to false. This is technically a breaking behavior change, but a properly written consumer of JSON Schema will not notice. For modelcontextprotocol#244. Fixes modelcontextprotocol#230.
Add a client example that lists all features on a stdio server. Since this is our first client example, organize examples by client / server -- otherwise it is too difficult to find client examples. For modelcontextprotocol#33
…rotocol#251) This CL effectively removes any dependencies on mcp from jsonschema. This will enable us to move the repo. This CL also deletes unused marshalStructWithMap and unmarshalStructWithMap which had a dependency on FieldJSONInfo. Fixes: modelcontextprotocol#250
Make the simplifications described in modelcontextprotocol#222. I don't know why we originally had such fine granularity of locking: perhaps we were going to execute 'oninitialized' callbacks. Also update the TODO with a bit more information about jsonrpc2 behavior. Fixes modelcontextprotocol#222
Update ServerSession so that the session is not marked as initialized until 'notifications/initialized' is actually received from the client. Include a new test of this lifecycle strictness. Fixes modelcontextprotocol#225
…modelcontextprotocol#262) This CL prunes the jsonschema directory and updates the go.mod. For modelcontextprotocol#28
Add unexported methods to the Params and Result interface, so that they're harder to implement outside the mcp package. It looks like these are the only two interfaces we need to lock down: others are either intentionally open (Transport, Connection), or already closed (Session). Fixes modelcontextprotocol#263
…tocol#261) Add auth.RequireBearerToken and associated types. This piece of middleware authenticates clients using OAuth 2.0, as specified in the MCP spec. For modelcontextprotocol#237. Usage: ``` st := mcp.NewStreamableServerTransport(...) http.Handle(path, auth.RequireBearerToken(verifier, nil)(st.ServeHTTP)) ```
This CL introduces a fundamental change to the jsonrpc2 library: connection writes, which were previously serialized by the jsonrpc2 library itself, are now allowed to be concurrent. The change in semantics of the jsonrpc2 library should hopefully be easy to review, since moving the synchronization to the Writer implementation is equivalent to the previous logic. However, this change is critical for the streamable client transport, because it allows for concurrent http requests to the server. Consider that a write is a POST to the server, and we don't know that write succeeded until we get the response header. Previously, we had the following problem: if the client POSTs a request, and the server blocks its response on a request made through the hanging GET, the client was unable to respond because the initial POST is still blocked. We could update our streamable server transport to force a flush of the response headers, but we can't guarantee that other servers behave the same way. Fundamentally, writes in the spec are asynchronous, and we need to support that.
Make several cleanups of the streamable client transport, encountered during work on JSON support for the streamable server: - The 'Close' condition is differentiated from asynchronous failures. A failure should unblock Read with an error, at which point the JSON-RPC connection will be broken and closed. - Fields are reordered in streamableClientConn to make guards more apparent. - The handling of sessionID is simplified: we simply set the session ID whenever we receive response headers. No need to have special handling for the first request, as the serializeation of session initialization is implemented in Client.Connect. - Since the above bullet makes Write a trivial wrapper around postMessage, the two methods are merged. - A bug is fixed where JSON responses were handled synchronously in Write. This lead to deadlock when a hanging client->server request is waiting on a server->client request. Now JSON is handled symmetrically to SSE: the Write returns once response headers are received. asynchronous to Write. - The httpConnection interface is renamed to clientConnection, and receive the entire InitializeResult. - streamableClientConn receivers are renamed to be consistently 'c'.
Add a new (currently unexported) jsonResponse option to StreamableServerTransportOptions, and use it to control the response content type, serving application/json if set. Additionally: - A transportOptions field is added to the StreamableHTTPOptions. - A messages iterator is added to encapsulate the iteration of stream messages, since the handling of JSON and SSE responses are otherwise very different. - The serving flow is refactored to avoid returning (statusCode, message), primarily because this seemed liable to lead to redundant calls to WriteHeader, because only local logic knows whether or not any data has been written to the response. - The serving flow is refactored to delegate to responseJSON and responseSSE, according to the currently unexported jsonResponse option. - A bug is fixed where all GET streams were considered persistent: the terminal condition req.Method == http.MethodPost && nOutstanding == 0 was not right: GET requests may implement stream resumption. Updates modelcontextprotocol#211
Now that rc3 is out, update our 1.25 builds to use it.
…ocol#270) For some reason, when making these marker methods, the standard naming convention escaped me.
- SessionState holds the state of a ServerSession. - SessionStore allows arbitrary storage for SessionState. - ServerSession.InitSession provides a session ID, store and state to a ServerSession.
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