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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

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

json_schema_to_type silently returns Any for allOf and oneOf schemas

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.

#3839 In PrefectHQ/fastmcp;

· strawgate opened on Apr 11, 2026

TransformedTool: output_schema=False documented but not implemented

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.

#3834 In PrefectHQ/fastmcp;

· strawgate opened on Apr 11, 2026

Introduce 3rd Party MCP Client/Server testing

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

tests

Status: Open.

#3820 In PrefectHQ/fastmcp;

· strawgate opened on Apr 10, 2026

Allow background task result TTL to be configured via environment variable

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.

#3802 In PrefectHQ/fastmcp;

· carterthayer opened on Apr 9, 2026

Showcase: Chart Library MCP server for financial pattern intelligence

invalidIssue lacks info, is off-topic, or doesn't make sense. Often LLM-generated spam.Issue lacks info, is off-topic, or doesn't make sense. Often LLM-generated spam.

Status: Open.

#3793 In PrefectHQ/fastmcp;

· grahammccain opened on Apr 8, 2026