pyursa: an open-source dataframe library built for AI agents

pyursa is a new open-source Python dataframe library: a lazy, strictly typed API running on Polars or DuckDB over Apache Arrow. It adds agent-focused features like structured errors with fixes, undo, lineage, dry runs and an MCP server, with identical semantics across engines.

• Errors surface at plan build with a stable code, details and a suggested fix
• Exact decimal math; Int64 overflow and lossy casts raise errors instead of corrupting data
• collect("polars") and collect("duckdb") return the same Arrow table
• Includes undo, intent-tagged history, lineage and an MCP server for agents