# AWS Lambda Tool MCP Server (awslabs.lambda-tool-mcp-server) - AgentBreakWatch Reference

> TL;DR Verdict: AWS Lambda Tool MCP Server (`awslabs.lambda-tool-mcp-server`) is currently at v2.1.1 on PYPI (published 2026-09-08), with a 90-day Stability Score of 86/100 (B+) and MEDIUM schema drift risk across 5 releases in the last 90 days. Requires FastMCP / MCP Python SDK v2+ tool schema validation; unpinned uvx awslabs.lambda-tool-mcp-server@latest deployments risk parameter drift across invoke_lambda_function and list_lambda_functions.

## Live Telemetry Metadata
- Canonical Page: https://agentbreakwatch.vercel.app/p/awslabs-lambda-mcp
- Category Hub: https://agentbreakwatch.vercel.app/c/aws-labs (AWS Labs Official MCP Servers (awslabs.*) Stability Index)
- Package Name: `awslabs.lambda-tool-mcp-server`
- Registry: PYPI (https://pypi.org/project/awslabs.lambda-tool-mcp-server/)
- GitHub Repository: https://github.com/awslabs/mcp
- Vendor: AWS Labs
- Latest Live Version: v2.1.1
- Published Date: 2026-09-08T15:20:42.332257Z
- 90-Day Release Count: 5
- Direct Dependencies: 3
- License: Apache-2.0
- Stability Score: 86/100 (Grade B+)
- Schema Drift Risk: MEDIUM
- Recommended Exact Pin Command: `uvx awslabs.lambda-tool-mcp-server@2.1.1`
- Watched Symbols / MCP Tools: invoke_lambda_function, list_lambda_functions
- Snapshot Timestamp: 2026-10-24T12:11:27.697Z

## Breaking Change & Schema Drift Summary
Requires FastMCP / MCP Python SDK v2+ tool schema validation; unpinned uvx awslabs.lambda-tool-mcp-server@latest deployments risk parameter drift across invoke_lambda_function and list_lambda_functions.

## Migration Diff: Before (Deprecated / Unpinned Pattern)
```
"awslabs-lambda-mcp": {
  "command": "uvx",
  "args": ["awslabs.lambda-tool-mcp-server"]
}
```

## Migration Diff: After (Verified v2.1.1 Pattern)
```
"awslabs-lambda-mcp": {
  "command": "uvx",
  "args": ["awslabs.lambda-tool-mcp-server@2.1.1"],
  "env": { "FASTMCP_LOG_LEVEL": "ERROR" }
}
```

## Recent Verified Releases
- v2.1.1 (published 2026-09-08) [LATEST]
- v2.1.0 (published 2026-08-26)
- v2.0.22 (published 2026-08-10)
- v2.0.21 (published 2026-08-05)
- v2.0.20 (published 2026-07-28)
- v2.0.19 (published 2026-05-09)