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Release history

FastMCP releases

A high-level framework for building MCP servers in TypeScript

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v4.0.1 Maintenance
Breaking upgrade

Routine maintenance and dependency updates.

Open
Config change
v4.0.0 Breaking risk
Auth

allowedRedirectUriPatterns default removed

Open
No immediate action
v3.35.0 New feature

onToolCall callback

Open
No immediate action
v3.34.0 New feature

outputSchema support

Open
Config change
v3.33.0 New feature
Crypto / TLS

HTTPS support

Open
No immediate action
v3.32.0 Bug fix

OAuth expires_in coercion fix

Open
No immediate action
v3.31.0 New feature

Edge runtime & custom HTTP routes

Open
No immediate action
v3.30.1 Bug fix

eventStore propagation fix

Open
Config change
v3.30.0 New feature
Auth

OAuth simplification + helpers

Open
Review required
v3.29.0 New feature
Auth

updateAuth + oauth swap-mode

Open
Config change
v3.28.0 New feature
Auth

Configurable token TTLs

Open
Config change
v3.27.0 New feature
Auth

client_secret_basic auth method

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No immediate action
v3.26.10 Bug fix

Unhandled rejection fix

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No immediate action
v3.26.9 Bug fix

File upload fix

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No immediate action
v3.26.8 Bug fix

Bug fixes and stability improvements.

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No immediate action
v3.26.7 Maintenance

Routine maintenance and dependency updates.

Open
Review required
v3.26.6 Maintenance
RBAC

Routine maintenance and dependency updates.

Open
Config change
v3.26.5 Maintenance
RBAC

Routine maintenance and dependency updates.

Open
Config change
v3.26.4 Maintenance
RBAC

Routine maintenance and dependency updates.

Open
No immediate action
v3.26.3 Maintenance

Routine maintenance and dependency updates.

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No immediate action
v3.26.2 Maintenance

Routine maintenance and dependency updates.

Open
Review required
v3.25.4 Bug fix
Auth

Basic auth header parsing fix

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No immediate action
v3.25.3 Maintenance

Routine maintenance and dependency updates.

Open
Review required
v3.25.2 Maintenance
Dependencies

Routine maintenance and dependency updates.

Open
No immediate action
v3.25.1 Maintenance

Routine maintenance and dependency updates.

Open
No immediate action
v3.25.0 New feature

PRM sub-path discovery

Open
Config change
v3.24.0 New feature
Auth

OAuth 2.1 Proxy implementation

Open
No immediate action
v3.23.1 Bug fix

Cursor completions fix

Open
Config change
v3.23.0 Bug fix
Auth

OAuth passthrough fix

Open
Review required
v3.22.0 New feature
RCE / SSRF

Runtime injection support

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No immediate action
v3.21.0 New feature

DiscoveryDocumentCache

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No immediate action
v3.20.2 Bug fix

tsconfig exclusion fix

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No immediate action
v3.20.1 Maintenance

Routine maintenance and dependency updates.

Open
Config change
v3.20.0 New feature
Auth

New features and improvements.

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v3.19.3 Bug fix
Auth

createSession auth failure fix

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v3.19.2 Bug fix

Roots check fix

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v3.19.1 Bug fix

Query params in embedded functions

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Config change
v3.19.0 New feature
Auth

Stateless OAuth

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v3.18.0 New feature

Notice stream: HTTP + SSE

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No immediate action
v3.17.0 New feature

structuredContent in UserError

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v3.16.0 New feature

Client details exposure

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No immediate action
v3.15.2 Bug fix

Missing transport instructions fixed

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No immediate action
v3.15.1 Bug fix

Session memory leak fix

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No immediate action
v3.15.0 New feature

Custom host path support

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No immediate action
v3.14.5 Bug fix

Stdio transport session fix

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Review required
v3.14.4 Maintenance
Dependencies

Routine maintenance and dependency updates.

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No immediate action
v3.14.3 Bug fix

Shutdown stack overflow fix

Open
Review required
v3.14.2 Maintenance
Dependencies

Routine maintenance and dependency updates.

Open
Review required
v3.14.1 Maintenance
Dependencies

Routine maintenance and dependency updates.

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No immediate action
v3.14.0 New feature

Custom logger

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Review required
v3.13.0 New feature
Auth

Stateless sessions

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v3.12.0 New feature

OAuth metadata fields

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v3.11.0 New feature

Filter tool by auth

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v3.10.0 New feature

Custom friendlyErrors messages

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v3.9.0 New feature

JSON response support

Open
Review required
v3.8.5 Maintenance
Dependencies

Routine maintenance and dependency updates.

Open
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v3.8.4 Maintenance
Dependencies

Routine maintenance and dependency updates.

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No immediate action
v3.8.3 Maintenance

Routine maintenance and dependency updates.

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No immediate action
v3.8.2 Bug fix

Progress update fix

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v3.8.1 Maintenance
Dependencies

Routine maintenance and dependency updates.

Open
Config change
v3.8.0 New feature
Auth

Authentication context

Open
Review required
v3.7.0 New feature
Auth

Well-known OAuth endpoints

Open
Review required
v3.6.2 Bug fix
Auth

Auth session handling revert

Open
Review required
v3.6.1 Bug fix
Auth

Auth session handling fix

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v3.6.0 New feature

ResourceLink support

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v3.5.0 New feature

Parameterless server.start()

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v3.4.0 New feature

Array output + sampling options

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v3.3.1 Bug fix

Dynamic imports for file-type

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Config change
v3.3.0 New feature
Breaking upgrade

Change HTTP server endpoint

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No immediate action
v3.2.0 New feature

Full MCP SDK schema support

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No immediate action
v3.1.1 Maintenance

Routine maintenance and dependency updates.

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No immediate action
v3.1.0 New feature

memory optimization + CLI enhancements

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No immediate action
v3.0.1 Bug fix

Bug fixes and stability improvements.

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v3.0.0 Breaking risk
Breaking changes
  • default endpoint changed from /stream to /mcp
Full changelog

3.0.0 (2025-06-07)

Features

BREAKING CHANGES

  • default endpoint is changed from /stream to /mcp to align with borader community conventions
View release on GitHub
Review required
v2.2.4 Maintenance
Dependencies

Routine maintenance and dependency updates.

Open
No immediate action
v2.2.3 Bug fix

Event loop flushing optimization

Open
No immediate action
v2.2.2 Bug fix

HTTP stream transport fix

Open
No immediate action
v2.2.1 Bug fix

HTTP streaming stability

Open

Beta — feedback welcome: [email protected]