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Upgrade checks failing on main branch

build failed

Status: Open.

#3962 In PrefectHQ/fastmcp;

· github-actions opened on Apr 17, 2026

Flaky Windows CI: tests/cli/test_run.py stdio timeouts

bugSomething isn't working. Reports of errors, unexpected behavior, or broken functionality.Something isn't working. Reports of errors, unexpected behavior, or broken functionality.

cliRelated to FastMCP CLI commands (run, dev, install) or CLI functionality.Related to FastMCP CLI commands (run, dev, install) or CLI functionality.

tests

Status: Open.

#3961 In PrefectHQ/fastmcp;

· jlowin opened on Apr 17, 2026

With the latest version of 3.2.4 the docString of some of the tools are not being parsed correctly

bugSomething isn't working. Reports of errors, unexpected behavior, or broken functionality.Something isn't working. Reports of errors, unexpected behavior, or broken functionality.

needs more infoIssue lacks detail to reproduce or understand. Waiting for reporter to provide context.Issue lacks detail to reproduce or understand. Waiting for reporter to provide context.

needs MREBug reports require a copy/pastable MRE that can run as-is.Bug reports require a copy/pastable MRE that can run as-is.

serverRelated to FastMCP server implementation or server-side functionality.Related to FastMCP server implementation or server-side functionality.

Status: Open.

#3955 In PrefectHQ/fastmcp;

· Jayssgss opened on Apr 17, 2026

Client._disconnect() needs timeout — hangs indefinitely on stale HTTP connections

bugSomething isn't working. Reports of errors, unexpected behavior, or broken functionality.Something isn't working. Reports of errors, unexpected behavior, or broken functionality.

clientRelated to the FastMCP client SDK or client-side functionality.Related to the FastMCP client SDK or client-side functionality.

httpRelated to HTTP transport, networking, or web server functionality.Related to HTTP transport, networking, or web server functionality.

needs MREBug reports require a copy/pastable MRE that can run as-is.Bug reports require a copy/pastable MRE that can run as-is.

too-longExcessively verbose or unedited LLM output. Condense before triage.Excessively verbose or unedited LLM output. Condense before triage.

Status: Open.

#3947 In PrefectHQ/fastmcp;

· godwinbw-egm opened on Apr 16, 2026

Docs feedback: Azure proxy wording overemphasizes DCR and underexplains direct Claude/Azure incompatibility

authRelated to authentication (Bearer, JWT, OAuth, WorkOS) for client or server.Related to authentication (Bearer, JWT, OAuth, WorkOS) for client or server.

documentationUpdates to docs, examples, or guides. Primary change is documentation-related.Updates to docs, examples, or guides. Primary change is documentation-related.

Status: Open.

#3942 In PrefectHQ/fastmcp;

· RajatSetoo opened on Apr 15, 2026

OpenAPI request director sends multipart/form-data and form-urlencoded as JSON, drops cookies

bugSomething isn't working. Reports of errors, unexpected behavior, or broken functionality.Something isn't working. Reports of errors, unexpected behavior, or broken functionality.

openapiRelated to OpenAPI integration, parsing, or code generation features.Related to OpenAPI integration, parsing, or code generation features.

Status: Open.

#3933 In PrefectHQ/fastmcp;

· strawgate opened on Apr 14, 2026

DereferenceRefsMiddleware crashes with RecursionError on JSON Pointer style $ref (non-$defs)

bugSomething isn't working. Reports of errors, unexpected behavior, or broken functionality.Something isn't working. Reports of errors, unexpected behavior, or broken functionality.

serverRelated to FastMCP server implementation or server-side functionality.Related to FastMCP server implementation or server-side functionality.

Status: Open.

#3893 In PrefectHQ/fastmcp;

· maxime-gautre opened on Apr 13, 2026

OTEL: Instrument ctx.sample() / sampling loop with spans and metrics

too-longExcessively verbose or unedited LLM output. Condense before triage.Excessively verbose or unedited LLM output. Condense before triage.

Status: Open.

#3891 In PrefectHQ/fastmcp;

· strawgate opened on Apr 13, 2026

Docs: Best practices for emitting custom spans from tools, prompts, and resources

documentationUpdates to docs, examples, or guides. Primary change is documentation-related.Updates to docs, examples, or guides. Primary change is documentation-related.

Status: Open.

#3888 In PrefectHQ/fastmcp;

· strawgate opened on Apr 13, 2026

OTEL: Instrument all MCP methods, not just tools/call, resources/read, prompts/get

clientRelated to the FastMCP client SDK or client-side functionality.Related to the FastMCP client SDK or client-side functionality.

enhancementImprovement to existing functionality. For issues and smaller PR improvements.Improvement to existing functionality. For issues and smaller PR improvements.

serverRelated to FastMCP server implementation or server-side functionality.Related to FastMCP server implementation or server-side functionality.

Status: Open.

#3887 In PrefectHQ/fastmcp;

· strawgate opened on Apr 13, 2026

OTEL: Fix attribute compliance with MCP semantic conventions

enhancementImprovement to existing functionality. For issues and smaller PR improvements.Improvement to existing functionality. For issues and smaller PR improvements.

Status: Open.

#3886 In PrefectHQ/fastmcp;

· strawgate opened on Apr 13, 2026

OAuthProxy: _refresh_locks dict grows unboundedly with token churn

authRelated to authentication (Bearer, JWT, OAuth, WorkOS) for client or server.Related to authentication (Bearer, JWT, OAuth, WorkOS) for client or server.

bugSomething isn't working. Reports of errors, unexpected behavior, or broken functionality.Something isn't working. Reports of errors, unexpected behavior, or broken functionality.

serverRelated to FastMCP server implementation or server-side functionality.Related to FastMCP server implementation or server-side functionality.

Status: Open.

#3866 In PrefectHQ/fastmcp;

· strawgate opened on Apr 12, 2026