# AWS Bedrock KB Retrieval MCP Server (awslabs.bedrock-kb-retrieval-mcp-server) - AgentBreakWatch Reference

> TL;DR Verdict: AWS Bedrock KB Retrieval MCP Server (`awslabs.bedrock-kb-retrieval-mcp-server`) is currently at v1.1.2 on PYPI (published 2026-09-22), with a 90-day Stability Score of 86/100 (B+) and MEDIUM schema drift risk across 6 releases in the last 90 days. Requires FastMCP / MCP Python SDK v2+ tool schema validation; unpinned uvx awslabs.bedrock-kb-retrieval-mcp-server@latest deployments risk parameter drift across QueryKnowledgeBases and ListKnowledgeBases.

## Live Telemetry Metadata
- Canonical Page: https://agentbreakwatch.vercel.app/p/awslabs-bedrock-kb-mcp
- Category Hub: https://agentbreakwatch.vercel.app/c/aws-labs (AWS Labs Official MCP Servers (awslabs.*) Stability Index)
- Package Name: `awslabs.bedrock-kb-retrieval-mcp-server`
- Registry: PYPI (https://pypi.org/project/awslabs.bedrock-kb-retrieval-mcp-server/)
- GitHub Repository: https://github.com/awslabs/mcp
- Vendor: AWS Labs
- Latest Live Version: v1.1.2
- Published Date: 2026-09-22T06:30:04.089806Z
- 90-Day Release Count: 6
- Direct Dependencies: 4
- License: Apache-2.0
- Stability Score: 86/100 (Grade B+)
- Schema Drift Risk: MEDIUM
- Recommended Exact Pin Command: `uvx awslabs.bedrock-kb-retrieval-mcp-server@1.1.2`
- Watched Symbols / MCP Tools: QueryKnowledgeBases, ListKnowledgeBases
- 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.bedrock-kb-retrieval-mcp-server@latest deployments risk parameter drift across QueryKnowledgeBases and ListKnowledgeBases.

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

## Migration Diff: After (Verified v1.1.2 Pattern)
```
"awslabs-bedrock-kb-mcp": {
  "command": "uvx",
  "args": ["awslabs.bedrock-kb-retrieval-mcp-server@1.1.2"],
  "env": { "FASTMCP_LOG_LEVEL": "ERROR" }
}
```

## Recent Verified Releases
- v1.1.2 (published 2026-09-22) [LATEST]
- v1.1.1 (published 2026-09-08)
- v1.1.0 (published 2026-08-26)
- v1.0.25 (published 2026-08-10)
- v1.0.24 (published 2026-08-05)
- v1.0.23 (published 2026-07-28)