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jerome/message-middleware
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85 Commits

Author SHA1 Message Date
Jerome Swannack 0f3edd4c5c fix: add pragma comments for test branch coverage 2026-01-19 16:22:57 +00:00
Jerome Swannack ac971959ce fix: address review feedback and add receive middleware test 
- Move 'import inspect' to top of file
- Pre-compute whether middleware is async using inspect.iscoroutinefunction()
  instead of checking on every message
- Add test for receive_middleware to fix coverage
 2026-01-19 16:17:03 +00:00
Jerome Swannack 90e8720768 feat: add message middleware support for ClientSession and ServerSession 
Add a middleware pattern that allows transforming JSON-RPC messages before
sending and after receiving. This provides a clean way to extend protocol
messages (e.g., adding custom capabilities to initialize requests) without
needing to subclass or override session methods.

Middleware functions receive a JSONRPCMessage and return a (possibly
transformed) JSONRPCMessage. Both sync and async middleware are supported.

Usage example:
    def add_capabilities(message: JSONRPCMessage) -> JSONRPCMessage:
        if isinstance(message.root, JSONRPCRequest):
            # Transform the message...
            pass
        return message

    session = ClientSession(
        read_stream, write_stream,
        send_middleware=[add_capabilities],
    )

Changes:
- Add MessageMiddleware type alias in mcp.shared.session
- Add send_middleware and receive_middleware parameters to BaseSession
- Apply middleware in send_request, send_notification, _send_response
- Apply middleware in _receive_loop after receiving messages
- Export MessageMiddleware, JSONRPCMessage, JSONRPCNotification from mcp
- Add tests for sync and async middleware
 2026-01-19 16:03:15 +00:00
Ondrej Mosnáček 65b36de4eb fix: use correct python command name in test_stdio.py (#1782)
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Signed-off-by: Ondrej Mosnáček <omosnacek@gmail.com>
 2025-12-12 14:02:38 +00:00
Marcelo Trylesinski a3a4b8d11a Add streamable_http_client which accepts httpx.AsyncClient instead of httpx_client_factory (#1177) 
Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>
 2025-12-10 16:39:00 +00:00
Jeremiah Lowin 0dedbd9831 feat: client-side support for SEP-1577 sampling with tools (#1722) 2025-12-09 23:36:28 +00:00
Max Isbey 8b984d93a3 refactor(auth): remove unused _register_client method (#1748) 2025-12-08 21:50:20 +00:00
Felix Weinberger fa851d93a2 feat: backwards-compatible create_message overloads for SEP-1577 (#1713) 2025-12-02 13:17:45 +00:00
Paul Carleton f82b0c9371 Support client_credentials flow with JWT and Basic auth (#1663) 
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>
 2025-12-02 12:53:55 +00:00
Paul Carleton f22501315e feat: implement SEP-991 URL-based client ID (CIMD) support (#1652) 
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>
 2025-11-24 17:21:03 +00:00
Jon Shea c51936f61f Add client_secret_basic authentication support (#1334) 
Co-authored-by: Paul Carleton <paulc@anthropic.com>
 2025-11-20 20:53:37 +00:00
Liang Wu 9c8f763aa8 chore: Lazy import jsonschema library (#1596) 
Co-authored-by: Max Isbey <224885523+maxisbey@users.noreply.github.com>
 2025-11-19 15:30:52 +00:00
Andrii Blyzniuk 5489e8b6fb fix get_client_metadata_scopes on 401 (#1631) 
Co-authored-by: Max Isbey <224885523+maxisbey@users.noreply.github.com>
 2025-11-16 17:18:50 +00:00
inaku a357380cfa feat: Pass through and expose additional parameters in ClientSessionGroup.call_tool and .connect_to_server (#1576) 2025-11-16 15:57:43 +00:00
Max Isbey 91ccdb3d65 Fix OAuth discovery fallback and URL ordering (#1624) 2025-11-13 19:37:24 +00:00
Max Isbey 7d12e83cf4 refactor: extract OAuth helper functions and simplify provider state (#1586) 2025-11-13 13:28:48 +00:00
Max Isbey 89e9c43acf Get baseline 100% clean coverage (#1553) 2025-11-11 14:09:32 +01:00
Camila Rondinini 9eae96a05e Add get_server_capabilities() to ClientSession (#1588)
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2025-11-06 20:44:40 +00:00
Chris Coutinho 3390e49c01 Implement SEP-985: OAuth Protected Resource Metadata discovery fallback (#1548) 
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Paul Carleton <paulc@anthropic.com>
 2025-11-05 15:51:02 +00:00
Luca Chang f161149680 Implement RFC 7523 JWT flows (#1247) 
Co-authored-by: Yann Jouanin <yann.jouanin@valueandco.com>
 2025-10-29 16:48:08 +00:00
Max Isbey db9e451551 fix: Replace remaining manual server polling with wait_for_server helper (#1529) 2025-10-29 11:27:57 +00:00
mingo007 b7e4ae7542 test: use errno.ENOENT for command not found assertion (#1498) 2025-10-23 16:30:50 -07:00
Samuel Felipe Chenatti 40acbc596c Expose RequestParams._meta in ClientSession.call_tool (#1231) 
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>
 2025-10-17 17:57:56 +01:00
Felix Weinberger de89457683 fix: send params as empty object for list methods without cursor (#1453) 2025-10-14 11:11:38 +01:00
Dogacan Colak 0e29cc4130 [client] Implement MCP OAuth scope selection and step-up authorization (#1324) 2025-10-13 14:18:00 +01:00
Peter Alexander 60f4b2d10a Add comprehensive Unicode tests for streamable HTTP transport (#1381) 2025-09-29 14:09:33 +01:00
Sreenath Somarajapuram 07ae8c0d4e types: Setting default value for method: Literal (#1292) 2025-08-26 16:22:56 +01:00
Justin Wang 9c6fd15a88 SDK Parity: Avoid Parsing Server Response for non-JsonRPCMessage Requests (#1290) 2025-08-26 16:14:47 +01:00
keurcien e750a06a99 fix: avoid uncessary retries in OAuth authenticated requests (#1206) 
Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>
 2025-08-22 11:45:54 +01:00
David Soria Parra 0926613714 Update dependencies and fix type issues (#1268) 
Co-authored-by: Marcelo Trylesinski <marcelotryle@gmail.com>
 2025-08-14 10:40:47 +01:00
Marcelo Trylesinski c7671e470c Add pyright strict mode on the whole project (#1254) 2025-08-11 18:56:37 +01:00
Luca Chang 35777b9811 fix: perform auth server metadata discovery fallbacks on any 4xx (#1193)
Main branch checks / checks (push) Failing after 1s
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2025-07-24 11:32:35 +01:00
Clare Liguori 6a84a2f79f fix: fix OAuth flow request object handling (#1174)
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2025-07-21 13:36:21 +01:00
Luca Chang 99c4f3c906 Support falling back to OIDC metadata for auth (#1061)
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2025-07-17 20:06:38 +01:00
yurikunash eb5146dc8b Implement RFC9728 - Support WWW-Authenticate header by MCP client (#1071) 2025-07-15 10:23:39 +01:00
Marcelo Trylesinski 95b44fb0d7 tests: use inline_snapshot.Is on parametrized test (#945) 
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>
 2025-07-14 21:59:37 +01:00
Jeremiah Lowin 81fe63a81d Ensure failed oauth registration response is read before accessing response.text (#1118) 
Co-authored-by: ihrpr <inna@anthropic.com>
 2025-07-10 22:01:17 +01:00
Felix Weinberger 3abefeeeaf fweinberger/align shutdown with spec (#1091) 
Co-authored-by: davenpi <davenport.ianc@gmail.com>
 2025-07-09 10:14:30 -04:00
Felix Weinberger e0336213e8 Improve child process termination on POSIX & Windows (#1078) 
Co-authored-by: jingx8885 <jingxu8885@qq.com>
Co-authored-by: Surya Prakash Susarla <susarla.surya.prakash.1998@gmail.com>
 2025-07-08 15:04:06 +01:00
Felix Weinberger cf72565d9a Unify process termination on POSIX & Windows (+ tests) (#1044) 
Co-authored-by: Cristian Pufu <cristian.pufu@uipath.com>
 2025-07-08 14:57:39 +01:00
Marcelo Trylesinski 9301924f44 chore: bump ruff (#1085) 2025-07-04 09:01:17 +01:00
bhosmer-ant 43bb24f62b feat: Add structured output support for tool functions (#993) 2025-06-26 09:36:17 +01:00
dr3s 41f3bc35ce Make "resource" optional on earlier protocols (#1017) 
Co-authored-by: Andres March <>
 2025-06-25 10:18:24 +01:00
Inna Harper 674768802a Fix /.well-known/oauth-authorization-server dropping path (#1014) 2025-06-24 15:43:26 +01:00
Inna Harper 17f9c00c53 MCP server separation into Authorization Server (AS) and Resource Server (RS) roles per spec PR #338 (#982) 
Co-authored-by: Paul Carleton <paulc@anthropic.com>
 2025-06-23 14:19:03 +01:00
Marcelo Trylesinski 543961968c Use 120 characters instead of 88 (#856) 2025-06-11 11:45:50 +02:00
dr3s 1a9ead07f5 relax validation (#879) 2025-06-09 19:21:01 +01:00
Sam Tombury 2bce10bdb1 Support Cursor OAuth client registration (#895) 2025-06-07 07:24:11 -07:00
Lorenzo 7f94bef85e Client sampling and roots capabilities set to None if not implemented (#802) 
Co-authored-by: ihrpr <inna@anthropic.com>
 2025-05-29 09:56:34 +01:00
Tim Child f5dd324354 Prevent stdio connection hang for missing server path. (#401) 
Co-authored-by: ihrpr <inna@anthropic.com>
 2025-05-28 22:57:46 +01:00