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- #3506 · jlowin opened
on Mar 14, 2026
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examples/sampling/structured_output.py fails with ToolError: Client does not support sampling with tools
bugSomething isn't working. Reports of errors, unexpected behavior, or broken functionality.Something isn't working. Reports of errors, unexpected behavior, or broken functionality.Status: Open.#4577 In PrefectHQ/fastmcp;Harden remaining claude-code-action workflows (dedupe verification, run-claude quoting, denial guards)
enhancementImprovement to existing functionality. For issues and smaller PR improvements.Improvement to existing functionality. For issues and smaller PR improvements.Status: Open.#4570 In PrefectHQ/fastmcp;Explore GitHub Agentic Workflows (gh-aw) for CI-based AI automations
enhancementImprovement to existing functionality. For issues and smaller PR improvements.Improvement to existing functionality. For issues and smaller PR improvements.proposalA proposal for a feature or enhancement either requiring or seeking comments on its design.A proposal for a feature or enhancement either requiring or seeking comments on its design.Status: Open.#4556 In PrefectHQ/fastmcp;Tool returning CallToolResult(isError=True) is serialized as text content; isError is dropped and the wire response reports success
bugSomething isn't working. Reports of errors, unexpected behavior, or broken functionality.Something isn't working. Reports of errors, unexpected behavior, or broken functionality.Status: Open.#4549 In PrefectHQ/fastmcp;Percent-encoded skill file names cannot be read in resources mode
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.#4545 In PrefectHQ/fastmcp;Skills with a UTF-8 BOM lose their frontmatter metadata
bugSomething isn't working. Reports of errors, unexpected behavior, or broken functionality.Something isn't working. Reports of errors, unexpected behavior, or broken functionality.Status: Open.#4532 In PrefectHQ/fastmcp;Data-backed File helper duplicates explicit filename extensions
bugSomething isn't working. Reports of errors, unexpected behavior, or broken functionality.Something isn't working. Reports of errors, unexpected behavior, or broken functionality.Status: Open.#4530 In PrefectHQ/fastmcp;OTEL: unify the background task submit → execution trace lifecycle and document task-poll span handling
enhancementImprovement to existing functionality. For issues and smaller PR improvements.Improvement to existing functionality. For issues and smaller PR improvements.too-beautifulBeautifully verbose and unedited LLM output. With no need to condense before triage.Beautifully verbose and unedited LLM output. With no need to condense before triage.Status: Open.#4506 In PrefectHQ/fastmcp;Example / ecosystem: BGPT scientific evidence MCP built for agents
documentationUpdates to docs, examples, or guides. Primary change is documentation-related.Updates to docs, examples, or guides. Primary change is documentation-related.enhancementImprovement to existing functionality. For issues and smaller PR improvements.Improvement to existing functionality. For issues and smaller PR improvements.Status: Open.#4504 In PrefectHQ/fastmcp;Do not log errors for ToolErrors
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.#4500 In PrefectHQ/fastmcp;StdioTransport(keep_alive=True)can't be reused across concurrently-alive event loops —initializehandshake hangs for the fullinit_timeoutbugSomething 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.Status: Open.#4471 In PrefectHQ/fastmcp;Expose the OIDC id_token alongside the access token
authRelated to authentication (Bearer, JWT, OAuth, WorkOS) for client or server.Related to authentication (Bearer, JWT, OAuth, WorkOS) for client or server.enhancementImprovement to existing functionality. For issues and smaller PR improvements.Improvement to existing functionality. For issues and smaller PR improvements.too-longExcessively verbose or unedited LLM output. Condense before triage.Excessively verbose or unedited LLM output. Condense before triage.Status: Open.#4463 In PrefectHQ/fastmcp;