MCP tool discovery crashes with MCP 2.0 Tool models

[hertznsk]

Description

Conductor crashes while discovering tools when installed with mcp==2.0.0. The dependency constraint currently allows this version (mcp>=1.28.1), but MCPManager reads the MCP model attribute as tool.inputSchema.

MCP 2.0 renamed the Python attribute to input_schema while preserving inputSchema as its serialization alias. As a result, connecting any stdio MCP server can fail before the workflow starts.

Error

AttributeError: 'Tool' object has no attribute 'inputSchema'. Did you mean: 'input_schema'?

Reproduction

1. Install Conductor in an environment that resolves mcp==2.0.0.
2. Configure a workflow with a stdio MCP server that exposes at least one tool.
3. Run the workflow.
4. Tool discovery fails in src/conductor/mcp/manager.py while reading tool.inputSchema.

A minimal model-level reproduction is:

from mcp.types import Tool

tool = Tool(name="search", inputSchema={"type": "object"})
print(tool.inputSchema)

Expected behavior

Conductor should discover tool schemas with both MCP 1.x and MCP 2.x model field naming.

Proposed fix

Read the schema through Pydantic serialization with aliases (tool.model_dump(by_alias=True)["inputSchema"]), which produces the same key for both supported model shapes, and add a regression test modeled after MCP 2.0.