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Title: Support RFC 8693 token exchange for enterprise IdP flows (SEP-990) by Kludex · Pull Request #2988 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: Support RFC 8693 token exchange for enterprise IdP flows (SEP-990) by Kludex · Pull Request #2988 · modelcontextprotocol/python-sdk

X Title: Support RFC 8693 token exchange for enterprise IdP flows (SEP-990) by Kludex · Pull Request #2988 · modelcontextprotocol/python-sdk

Description: Summary Implements SEP-990 (enterprise IdP policy controls during MCP OAuth flows). The wire mechanism is the RFC 8693 token-exchange grant (urn:ietf:params:oauth:grant-type:token-exchange): a client exchanges an enterprise IdP-issued Identity Assertion Authorization Grant (ID-JAG) for an MCP access token at the authorization server's token endpoint. This is additive and opt-in on both sides; existing flows are unchanged. Client TokenExchangeOAuthProvider (mcp.client.auth.extensions.token_exchange) is an httpx.Auth that posts the exchange, mirroring the client_credentials extension. The ID-JAG is supplied lazily via an async subject_token_provider(audience) callback — the SDK does not implement IdP login or the first exchange against the IdP (deployment-specific). Public (default, none) and confidential (client_secret_post/client_secret_basic) clients are supported; requested_token_type defaults to the access-token URN. Server OAuthAuthorizationServerProvider.exchange_token validates the subject token (signature/issuer/audience/expiry/policy — the provider's responsibility) and issues the token. Gated by AuthSettings(token_exchange_enabled=True), which: advertises the grant + the public-client none auth method in AS metadata, and gates the /token endpoint: with the flag off, /token rejects the grant with unsupported_grant_type even if the provider implements exchange_token. TokenError gains RFC 8693's invalid_target; TokenExchangeToken carries the required issued_token_type (the handler defaults it so responses are compliant regardless of provider). TokenExchangeRequest enforces RFC 8693 actor-token pairing. The provider owns scope decisions: requested scopes are never granted verbatim. The example server narrows the request against an allowed set so a valid ID-JAG cannot be exchanged for broader access than policy permits. Review Reviewed by Codex across two rounds. Round one raised seven should-fix findings; all were addressed (dispatch gating, issued_token_type, scope-escalation hardening in the example, invalid_target, actor-token pairing, Basic-auth confidential client, public-client advertisement). The follow-up review confirmed every finding resolved with no new Critical/Should-fix issues. Testing Unit + ASGI HTTP tests for the client extension and the server token handler (13 server, 7 client, plus shared-model coverage). Verified end to end over real Uvicorn sockets with a real RS256-signed JWT acting as the ID-JAG: AS metadata discovery, raw /token exchange, forged-signature rejection, and a full MCP session (discovery → 401 → token exchange → bearer-gated tool call) all pass. ./scripts/test: 100% coverage, strict-no-cover clean, pyright clean. This exercise surfaced a separate AS-metadata issuer normalization bug, fixed in #2987 (merged); this branch builds on it. Docs: new SEP-990 section in docs/migration.md; client + server snippets under examples/snippets/. AI Disclaimer This PR was developed with the assistance of either Claude or Codex. I've reviewed and verified the changes.

Open Graph Description: Summary Implements SEP-990 (enterprise IdP policy controls during MCP OAuth flows). The wire mechanism is the RFC 8693 token-exchange grant (urn:ietf:params:oauth:grant-type:token-exchange): a clie...

X Description: Summary Implements SEP-990 (enterprise IdP policy controls during MCP OAuth flows). The wire mechanism is the RFC 8693 token-exchange grant (urn:ietf:params:oauth:grant-type:token-exchange): a clie...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2988

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e8df714 Support RFC 8693 token exchange for enterprise IdP flows (SEP-990) Kludex Jun 26, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2988/commits/e8df714fce8e8ca79a84743a95ee26e312301dca
92fae82 Preserve empty issuer/resource paths on AuthSettings Kludex Jun 26, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2988/commits/92fae82469b6fce2f7c669c69a186256a9df8d70
2c7cb17 Merge branch 'auth-settings-preserve-empty-path' into worktree-synthe… Kludex Jun 26, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2988/commits/2c7cb171f3236daf748159b7b635dd5b67702c12
c7cacf0 Merge remote-tracking branch 'origin/main' into worktree-synthetic-st… Kludex Jun 26, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2988/commits/c7cacf09000873639409ea3370ff8d7afe9d4a26
55c2413 Add end-to-end interaction tests for token exchange (SEP-990) Kludex Jun 26, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2988/commits/55c2413616f38abeec317d2766341a7914ecbf37
b94851b Strengthen token-exchange interaction tests per review Kludex Jun 26, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2988/commits/b94851b01b8f0c22841419fb53d253a5334c80ec
7783020 Use the RFC 7523 jwt-bearer grant for the SEP-990 ID-JAG leg Kludex Jun 26, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2988/commits/7783020b615ade0c1083fc891e9d8a800382a063
0f4052c Harden the identity-assertion grant per review Kludex Jun 26, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2988/commits/0f4052cc69db3507a3b64785672d7734a88c9023
05f60ce Pin identity-assertion discovery to the expected authorization server Kludex Jun 26, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2988/commits/05f60ce32e083d08b76dc52ef072eca7016eb8ec
6689e0a Don't broaden initial identity-assertion scope; normalize origin ports Kludex Jun 26, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2988/commits/6689e0a6c32cef804c7a37ff43f30f561e3d9fb8
4393b4b Always send the configured scope on identity-assertion exchanges Kludex Jun 26, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2988/commits/4393b4b70792399bc0dde0515b169a57237998ba
d011d3a Merge remote-tracking branch 'origin/main' into worktree-synthetic-st… Kludex Jun 26, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2988/commits/d011d3af67611a4c1a66ea1fdd2c582a5de10f25
095f189 Make IdentityAssertionOAuthProvider a standalone httpx.Auth maxisbey Jun 26, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2988/commits/095f189bd8761c3b8733606f6b4ad7b9d34066fa
dfd458a Merge remote-tracking branch 'origin/worktree-synthetic-stirring-tree… maxisbey Jun 26, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2988/commits/dfd458a19b655b781501d1431b5b30c75f1fdfb3
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