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Title: fix(oauth): preserve existing refresh_token when refresh response omits it by oedokumaci · Pull Request #2271 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: fix(oauth): preserve existing refresh_token when refresh response omits it by oedokumaci · Pull Request #2271 · modelcontextprotocol/python-sdk

X Title: fix(oauth): preserve existing refresh_token when refresh response omits it by oedokumaci · Pull Request #2271 · modelcontextprotocol/python-sdk

Description: Fixes #2270 Per RFC 6749 Section 6, the authorization server MAY issue a new refresh token in the refresh response. When it doesn't, _handle_refresh_response overwrites the stored token as-is, discarding the existing refresh_token. After the first successful refresh, can_refresh_token() returns False and subsequent refreshes fail. This preserves the existing refresh_token when the response omits one, using model_copy(update=...). Also removes # pragma: no cover from _handle_refresh_response (added in a bulk coverage baseline, not intentional) and adds tests covering all branches: success with preservation, success with rotation, no prior tokens, non-200 failure, and invalid JSON. Note: #2270 hasn't received the ready for work label yet. Submitting this early since the fix is small and self-contained. Happy to wait or adjust based on maintainer feedback.

Open Graph Description: Fixes #2270 Per RFC 6749 Section 6, the authorization server MAY issue a new refresh token in the refresh response. When it doesn't, _handle_refresh_response overwrites the stored token as-is, ...

X Description: Fixes #2270 Per RFC 6749 Section 6, the authorization server MAY issue a new refresh token in the refresh response. When it doesn't, _handle_refresh_response overwrites the stored token as-...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2271

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ae5050b fix(oauth): preserve existing refresh_token when refresh response omi… oedokumaci Mar 11, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2271/commits/ae5050b089803401008248435e999a169dbc3a5d
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