- Current: mcp 1.29.0 (latest v1 line, released Jul 28 2026)
- MCP v2.0.0 exists but is blocked by DSPy 3.3.0 incompatibility (uses camelCase field access:
tool.inputSchema, result.isError which became tool.input_schema, result.is_error in v2)
Why not mcp v2?
DSPy 3.3.0 (latest, Aug 3 2026) has dspy/utils/mcp.py that accesses:
tool.inputSchema → broken in v2 (AttributeError)call_tool_result.isError → broken in v2 (AttributeError)
No newer DSPy version exists. Upgrading to mcp v2 would require monkey-patching DSPy internals. Not worth the fragility.
tool.inputSchema,result.isErrorwhich becametool.input_schema,result.is_errorin v2)Why not mcp v2?
DSPy 3.3.0 (latest, Aug 3 2026) has
dspy/utils/mcp.pythat accesses:tool.inputSchema→ broken in v2 (AttributeError)call_tool_result.isError→ broken in v2 (AttributeError)No newer DSPy version exists. Upgrading to mcp v2 would require monkey-patching DSPy internals. Not worth the fragility.