Single MCP Server Tested Against Seven Apache Iceberg REST Catalogs

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A developer has built and open-sourced a single MCP server for Apache Iceberg tables, designed to work with any MCP client such as Claude Code. The server exposes four read-only tools — listing tables, describing schemas, counting rows, and scanning data — with a single environment variable determining which catalog it targets. It was tested against seven Iceberg REST catalogs, including Apache Polaris running locally in Docker, and cloud services from Google, Microsoft, AWS, Snowflake, and Databricks. Tests were conducted on September 18–19, 2026, with one run per catalog and no AI model involved, ensuring results reflect only the catalog and server configuration. The project serves as a practical conformance check confirming that the same server code can reach multiple Iceberg REST-compliant catalogs without modification.

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