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Mounted child tools lose execution.taskSupport in parent tools/list

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.

#3569 In PrefectHQ/fastmcp;

· nkaras opened on Mar 20, 2026

Middleware ToolError on auth failure returns HTTP 400 instead of 401

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.

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

potential-duplicateBot-suggested duplicate awaiting human review. Auto-closes after 3 days if unchallenged.Bot-suggested duplicate awaiting human review. Auto-closes after 3 days if unchallenged.

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

Status: Open.

#3566 In PrefectHQ/fastmcp;

· alessandro-veras opened on Mar 20, 2026

Upgrade checks failing on main branch

build failed

Status: Open.

#3565 In PrefectHQ/fastmcp;

· github-actions opened on Mar 20, 2026

feat: add block-no-verify PreToolUse hook to .claude/settings.json

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.

#3561 In PrefectHQ/fastmcp;

· tupe12334 opened on Mar 19, 2026

Proposal: Add first-class support for config-defined command-backed MCP tools

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.

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

Status: Open.

#3558 In PrefectHQ/fastmcp;

· HaochengLu opened on Mar 19, 2026

Allow specifying OAuth scopes, client_id, and client_secret in MCP config

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.

#3555 In PrefectHQ/fastmcp;

· DRayX opened on Mar 19, 2026

HTTP request headers not accessible in background task workers

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

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

potential-duplicateBot-suggested duplicate awaiting human review. Auto-closes after 3 days if unchallenged.Bot-suggested duplicate awaiting human review. Auto-closes after 3 days if unchallenged.

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

Status: Open.

#3545 In PrefectHQ/fastmcp;

· carterthayer opened on Mar 18, 2026

Provide the open telemetry span attributes in the start_as_current_span call

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.

#3535 In PrefectHQ/fastmcp;

· CaselIT opened on Mar 17, 2026

Support GenAI semantic convention in open telemetry

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.

#3534 In PrefectHQ/fastmcp;

· CaselIT opened on Mar 17, 2026

Please read this before opening an issue or PR

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

ignore in release notesMinor change for release notes. Use sparingly for meta PRs like workflow tests.Minor change for release notes. Use sparingly for meta PRs like workflow tests.

Status: Open.

#3506 In PrefectHQ/fastmcp;

· jlowin opened on Mar 14, 2026

Interoperating with OpenTelemetry instrumentation in the MCP SDK

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.

#3451 In PrefectHQ/fastmcp;

· aabmass opened on Mar 10, 2026

[Proposal] LLM-powered CurationTransform for OpenAPI → MCP quality

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

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

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.

#3392 In PrefectHQ/fastmcp;

· sheshnath08 opened on Mar 5, 2026