added support for mcp tools for when people use flow handlers

[personal-dc]

Added support for using mcp tools with flow manager

• added an "is_mcp" flag for a function in the flow_config to make the flow manager aware that the handler should be looking directly at llm registered tools (via the mcp server)
• wrap the function in a handler like the flow manager expects

Usage:

# Initialize MCP Client
from pipecat.services.mcp_service import MCPClient

mcp = MCPClient(
            server_params=StreamableHttpParameters(
                url="https://api.githubcopilot.com/mcp/",
                headers={"Authorization": f"Bearer {os.getenv('GITHUB_PERSONAL_ACCESS_TOKEN')}"},
            )
        )

tools = await mcp.register_tools(llm)

# In your flow config 
flow_config = {
    "nodes": {
        "vehicle_lookup": {
            "task_messages": [
                {"role": "system", "content": "Your role messages"}
            ],
            "functions": [
                # regular function with an already implemented flow handler
                {
                    "type": "function",
                    "function": {
                        "name": "implemented_handler_function",
                        "handler": "implemented_handler_function",
                        "description": "function with an implemented flow handler",
                        "parameters": {"type": "object", "properties": {}, "required": []}
                    }
                },
                # MCP server registered function with an already implemented flow handler
                {
                    "type": "function",
                    "function": {
                        "name": "mcp_registered_function",
                         # KEY ADDITION
                        "is_mcp": True,
                        "description": "Description of that function",
                        "parameters": {
                            "type": "object",
                            "properties": {"arg": {"type": "arg type"}},
                            "required": ["arg"]
                        }
                    }
                },

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Project	Deployment	Preview	Updated (UTC)
pipecat-flows	Ready	Preview	Aug 22, 2025 7:10pm

[personal-dc]

@markbackman could you please review this PR and leave feedback - thanks!