# MotherDuck & DuckDB MCP Server (mcp-server-motherduck) - AgentBreakWatch Reference

> TL;DR Verdict: MotherDuck & DuckDB MCP Server (`mcp-server-motherduck`) is currently at v1.1.0 on PYPI (published 2026-10-07), with a 90-day Stability Score of 86/100 (B+) and MEDIUM schema drift risk across 2 releases in the last 90 days. Requires FastMCP / MCP Python SDK v2+ tool schema validation; unpinned uvx mcp-server-motherduck@latest deployments risk parameter drift across query and list_databases.

## Live Telemetry Metadata
- Canonical Page: https://agentbreakwatch.vercel.app/p/mcp-motherduck
- Category Hub: https://agentbreakwatch.vercel.app/c/database-backend (Database, SQL & Vector DB MCP Servers Stability Index)
- Package Name: `mcp-server-motherduck`
- Registry: PYPI (https://pypi.org/project/mcp-server-motherduck/)
- GitHub Repository: https://github.com/motherduckdb/mcp-server-motherduck
- Vendor: MotherDuck
- Latest Live Version: v1.1.0
- Published Date: 2026-10-07T14:43:05.903354Z
- 90-Day Release Count: 2
- Direct Dependencies: 9
- License: MIT
- Stability Score: 86/100 (Grade B+)
- Schema Drift Risk: MEDIUM
- Recommended Exact Pin Command: `uvx mcp-server-motherduck@1.1.0`
- Watched Symbols / MCP Tools: query, list_databases, describe_table
- Snapshot Timestamp: 2026-10-24T12:11:27.697Z

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

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

## Migration Diff: After (Verified v1.1.0 Pattern)
```
"mcp-motherduck": {
  "command": "uvx",
  "args": ["mcp-server-motherduck@1.1.0"],
  "env": { "FASTMCP_LOG_LEVEL": "ERROR" }
}
```

## Recent Verified Releases
- v1.1.0 (published 2026-10-07) [LATEST]
- v1.0.8 (published 2026-08-19)
- v1.0.7 (published 2026-06-09)
- v1.0.6 (published 2026-04-29)
- v1.0.5 (published 2026-04-28)
- v1.0.4 (published 2026-03-30)