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awslabs-cfn-mcp-server

library1.0.19pypypiunverified

An AWS Labs Model Context Protocol (MCP) server for performing common CloudFormation tasks and managing resources in your AWS account. Current version 1.0.19, released monthly.

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pip install awslabs-cfn-mcp-server

github ↗package ↗homepage ↗docs ↗changelog ↗

INSTALL

IMPORT

SIG · AWSLABS-CFN-MCP-SE

awslabs-cfn-mcp-server

awspythonv1.0.19

Install

—

Import

—

Disk

—

Pass rate

0/ 10

Env Coverage0 / 10

glibc

3.9–3.13

musl

3.9–3.13

Install & Compatibility

Where this runs

tested against v? · pip install

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

py 3.10–3.95 runs

build_error

glibc

py 3.10–3.95 runs

build_error

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

mcp_server

✓ from cfn_mcp_server.server import mcp_server

✗ from awslabs_cfn_mcp_server import mcp_server

Correct import path is under cfn_mcp_server, not the package top-level

Initialize and run the MCP server. Requires AWS credentials.

import os from cfn_mcp_server.server import mcp_server # Set AWS credentials via environment variables os.environ['AWS_ACCESS_KEY_ID'] = os.environ.get('AWS_ACCESS_KEY_ID', '') os.environ['AWS_SECRET_ACCESS_KEY'] = os.environ.get('AWS_SECRET_ACCESS_KEY', '') os.environ['AWS_DEFAULT_REGION'] = os.environ.get('AWS_DEFAULT_REGION', 'us-east-1') if __name__ == '__main__': mcp_server.run()

cfn-mcp-server --version

Debug

Known issues

gotchaThe server only reports status events if the handler runs asynchronously; blocking calls may hang the MCP connection.

fix

Use async handlers or ensure your tools do not block the event loop.

affects: >=1.0.0

deprecatedThe 'cfn_lint' tool may be deprecated in future releases; prefer using 'cfn_nag' or direct linting via cfn-lint package.

fix

Use the 'cfn_nag' tool instead or call cfn-lint directly from your code.

affects: 1.0.10 to 1.0.19

breakingVersion 1.0.15 changed the default AWS session configuration to require explicit region setting.

fix

Set AWS_DEFAULT_REGION environment variable or pass region in the constructor.

affects: >=1.0.15

gotchaThe MCP server uses stdio transport by default; ensure your MCP client (e.g., Claude Desktop) is configured with 'command': 'python', 'args': ['-m', 'cfn_mcp_server'].

fix

Configure the client with the correct command and arguments.

affects: >=1.0.0

Upgrade

Version history

1.0.19latest on PyPI · released Mar 13, 2026

Audit

Dependencies

boto3requiredRequired for AWS API calls

mcprequiredRequired for MCP server implementation

Agent activity

28 hits · last 30 days

node

OpenAI (training)

Resources

githubhttps://github.com/awslabs/mcp ↗

packagehttps://pypi.org/project/awslabs-cfn-mcp-server/ ↗

homepagehttps://awslabs.github.io/mcp/ ↗

docshttps://awslabs.github.io/mcp/servers/cfn-mcp-server/ ↗

changeloghttps://github.com/awslabs/mcp/blob/main/src/cfn-mcp-server/CHANGELOG.md ↗