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Feature Request: Support for Read-Only / Read-Write Tool Classification

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.

#4104 In PrefectHQ/fastmcp;

· Sozhan308 opened on May 7, 2026

t.custom is not a function" in app-bridge.js on Windows - dev UI blank

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.

Status: Open.

#4102 In PrefectHQ/fastmcp;

· abTst opened on May 5, 2026

Add a pytest-mcp-plugin example to examples/ (community testing harness)

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.

tests

Status: Open.

#4099 In PrefectHQ/fastmcp;

· yagna-1 opened on May 5, 2026

DeprecationWarning from authlib.jose import in JWT auth provider

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.

Status: Open.

#4098 In PrefectHQ/fastmcp;

· jakubno3ak opened on May 5, 2026

ArgTransform(type=...) places $defs inside the property node instead of hoisting to schema root

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.

#4093 In PrefectHQ/fastmcp;

· navalnica opened on May 4, 2026

Code Mode API and LSP

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.

#4089 In PrefectHQ/fastmcp;

· ryanpeach opened on May 1, 2026

Tools registered with visibility=["app"] on plain @mcp.tool are unreachable in tools/call (3.2.4)

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

mcp appsRelated to MCP Apps - user-facing applications with frontend bundles served by MCP servers.Related to MCP Apps - user-facing applications with frontend bundles served by MCP servers.

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

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

Status: Open.

#4088 In PrefectHQ/fastmcp;

· keremnalbant opened on May 1, 2026

Windows startup crash due to UnicodeDecodeError when loading skills

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.

#4084 In PrefectHQ/fastmcp;

· jmarenin opened on Apr 29, 2026

cli option --no-banner is NOT passed to cli but server-spec in-correctly when cli --reload option is specified.

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.

Status: Open.

#4081 In PrefectHQ/fastmcp;

· itaru2622 opened on Apr 29, 2026

Upgrade checks failing on main branch

build failed

Status: Open.

#4079 In PrefectHQ/fastmcp;

· github-actions opened on Apr 29, 2026

Supabase Auth example

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.

Status: Open.

#4063 In PrefectHQ/fastmcp;

· tleyden opened on Apr 26, 2026

ToolResult isError lost and dedupe_with_versions() shares mutable meta

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.

#4055 In PrefectHQ/fastmcp;

· strawgate opened on Apr 26, 2026