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<code>CodeMode.execute</code> caches the backend tool catalog and misses same-run visibility changes

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.

#3368 In PrefectHQ/fastmcp;

· yangbaechu opened on Mar 3, 2026

Built-in CodeMode tools handle duplicate-name versioned tools inconsistently

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.

#3367 In PrefectHQ/fastmcp;

· yangbaechu opened on Mar 3, 2026

Resource templates with query params ({?param}) silently fail on mounted servers

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.

#3366 In PrefectHQ/fastmcp;

· AhmedFarrukh opened on Mar 3, 2026

Add comprehensive environment variable reference to configuration documentation

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

Status: Open.

#3364 In PrefectHQ/fastmcp;

· KlementMultiverse opened on Mar 3, 2026

Allow <code>custom config</code> path for 'fastmcp install claude-desktop'

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

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

Status: Open.

#3346 In PrefectHQ/fastmcp;

· Sumanshu-Nankana opened on Mar 1, 2026

SupabaseProvider: support metadata-only scopes_supported (separate from required_scopes) for MCP client interoperability

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.

providerRelated to the FastMCP Provider classRelated to the FastMCP Provider class

Status: Open.

#3345 In PrefectHQ/fastmcp;

· gitNetw0rk opened on Mar 1, 2026

Upgrade checks failing on main branch

build failed

Status: Open.

#3341 In PrefectHQ/fastmcp;

· github-actions opened on Mar 1, 2026

Document all available settings and environment variables

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

Status: Open.

#3275 In PrefectHQ/fastmcp;

· jlowin opened on Feb 22, 2026

FastMCP 3.0: generate-cli doesn't handle background tasks

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

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

v3Targeted for FastMCP 3Targeted for FastMCP 3

Status: Open.

#3203 In PrefectHQ/fastmcp;

· yevhenp opened on Feb 17, 2026

Run MCP conformance tests

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

tests

Status: Open.

#3202 In PrefectHQ/fastmcp;

· jlowin opened on Feb 17, 2026

Hello world project errors when built by Prefect Horizon

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.

duplicateDuplicates an existing open issue. Reference the original issue when applying.Duplicates an existing open issue. Reference the original issue when applying.

Status: Open.

#3184 In PrefectHQ/fastmcp;

· importRyan opened on Feb 13, 2026

Make the starlet lifespan state publically accessible

duplicateDuplicates an existing open issue. Reference the original issue when applying.Duplicates an existing open issue. Reference the original issue when applying.

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.

#3180 In PrefectHQ/fastmcp;

· jonha892 opened on Feb 13, 2026