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modelcontextprotocol
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python-sdk
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session_idle_timeout is not exposed via streamable_http_app() and can cancel active requests
bug
Something isn't working
Something isn't working
fix proposed
Bot has a verified fix diff in the comment
Bot has a verified fix diff in the comment
P2
Moderate issues affecting some users, edge cases, potentially valuable feature
Moderate issues affecting some users, edge cases, potentially valuable feature
ready for work
Enough information for someone to start working on
Enough information for someone to start working on
Status: Open.
#2455
In modelcontextprotocol/python-sdk;
·
shaun0927
opened
on Apr 16, 2026
stdio_client crashes on malformed UTF-8 from child stdout instead of surfacing parse error
bug
Something isn't working
Something isn't working
fix proposed
Bot has a verified fix diff in the comment
Bot has a verified fix diff in the comment
P2
Moderate issues affecting some users, edge cases, potentially valuable feature
Moderate issues affecting some users, edge cases, potentially valuable feature
ready for work
Enough information for someone to start working on
Enough information for someone to start working on
Status: Open.
#2454
In modelcontextprotocol/python-sdk;
·
shaun0927
opened
on Apr 16, 2026
Windows: TextIOWrapper in stdio_server() emits CRLF instead of LF, corrupting newline-delimited JSON messages
bug
Something isn't working
Something isn't working
fix proposed
Bot has a verified fix diff in the comment
Bot has a verified fix diff in the comment
P2
Moderate issues affecting some users, edge cases, potentially valuable feature
Moderate issues affecting some users, edge cases, potentially valuable feature
ready for work
Enough information for someone to start working on
Enough information for someone to start working on
Status: Open.
#2433
In modelcontextprotocol/python-sdk;
·
DonovanDeHart
opened
on Apr 13, 2026
Initialize call hangs forever if MCP server does not return a
Content-Type: text/plain
bug
Something isn't working
Something isn't working
fix proposed
Bot has a verified fix diff in the comment
Bot has a verified fix diff in the comment
P2
Moderate issues affecting some users, edge cases, potentially valuable feature
Moderate issues affecting some users, edge cases, potentially valuable feature
ready for work
Enough information for someone to start working on
Enough information for someone to start working on
Status: Open.
#2432
In modelcontextprotocol/python-sdk;
·
HenriChabert
opened
on Apr 13, 2026
McpError is not pickle-safe and fails to unpickle
bug
Something isn't working
Something isn't working
fix proposed
Bot has a verified fix diff in the comment
Bot has a verified fix diff in the comment
P2
Moderate issues affecting some users, edge cases, potentially valuable feature
Moderate issues affecting some users, edge cases, potentially valuable feature
ready for work
Enough information for someone to start working on
Enough information for someone to start working on
Status: Open.
#2431
In modelcontextprotocol/python-sdk;
·
rain87
opened
on Apr 13, 2026
[v1.x] Server-side outputSchema validation blocks tool error reporting (isError: true)
bug
Something isn't working
Something isn't working
fix proposed
Bot has a verified fix diff in the comment
Bot has a verified fix diff in the comment
P2
Moderate issues affecting some users, edge cases, potentially valuable feature
Moderate issues affecting some users, edge cases, potentially valuable feature
ready for work
Enough information for someone to start working on
Enough information for someone to start working on
Status: Open.
#2429
In modelcontextprotocol/python-sdk;
·
kimsehwan96
opened
on Apr 13, 2026
Bug: AssertionError: Request already responded to — cancellation race in v1.27.0
bug
Something isn't working
Something isn't working
fix proposed
Bot has a verified fix diff in the comment
Bot has a verified fix diff in the comment
P2
Moderate issues affecting some users, edge cases, potentially valuable feature
Moderate issues affecting some users, edge cases, potentially valuable feature
ready for work
Enough information for someone to start working on
Enough information for someone to start working on
Status: Open.
#2416
In modelcontextprotocol/python-sdk;
·
bbarwik
opened
on Apr 9, 2026
fix: validate_scope treats None registered scopes as no restrictions
auth
Issues and PRs related to Authentication / OAuth
Issues and PRs related to Authentication / OAuth
bug
Something isn't working
Something isn't working
P2
Moderate issues affecting some users, edge cases, potentially valuable feature
Moderate issues affecting some users, edge cases, potentially valuable feature
Status: Open (in progress).
modelcontextprotocol/python-sdk
number 2224
#2224
In modelcontextprotocol/python-sdk;
·
shivama205
opened
on Mar 6, 2026
Bug: validate_scope rejects client scopes when required scopes in None
auth
Issues and PRs related to Authentication / OAuth
Issues and PRs related to Authentication / OAuth
bug
Something isn't working
Something isn't working
P2
Moderate issues affecting some users, edge cases, potentially valuable feature
Moderate issues affecting some users, edge cases, potentially valuable feature
ready for work
Enough information for someone to start working on
Enough information for someone to start working on
Status: Open.
#2216
In modelcontextprotocol/python-sdk;
·
nik1097
opened
on Mar 5, 2026
get_access_token() returns stale token in stateful streamable-HTTP sessions
auth
Issues and PRs related to Authentication / OAuth
Issues and PRs related to Authentication / OAuth
bug
Something isn't working
Something isn't working
v2
Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixes
Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixes
Status: Open.
#2208
In modelcontextprotocol/python-sdk;
·
maxisbey
opened
on Mar 4, 2026
fix: pass related_request_id in Context.report_progress()
bug
Something isn't working
Something isn't working
needs confirmation
Needs confirmation that the PR is actually required or needed.
Needs confirmation that the PR is actually required or needed.
Status: Open (in progress).
modelcontextprotocol/python-sdk
number 2207
#2207
In modelcontextprotocol/python-sdk;
·
weiguangli-io
opened
on Mar 4, 2026
fix: handle HTTP 4xx/5xx gracefully in StreamableHTTP transport
bug
Something isn't working
Something isn't working
needs confirmation
Needs confirmation that the PR is actually required or needed.
Needs confirmation that the PR is actually required or needed.
P2
Moderate issues affecting some users, edge cases, potentially valuable feature
Moderate issues affecting some users, edge cases, potentially valuable feature
Status: Open (in progress).
modelcontextprotocol/python-sdk
number 2199
#2199
In modelcontextprotocol/python-sdk;
·
Varun6578
opened
on Mar 2, 2026
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