Session-aware Factory

examples/pydantic/factory_agent.py is the smallest example that reacts to session context.

from pydantic_ai import Agent
from pydantic_ai.models.test import TestModel
from pydantic_acp import (
    AcpSessionContext,
    AdapterConfig,
    AdapterModel,
    MemorySessionStore,
    run_acp,
)

FAST_MODEL = TestModel(custom_output_text="Fast workspace summary.")
REVIEW_MODEL = TestModel(custom_output_text="Detailed review summary.")


def build_agent(session: AcpSessionContext) -> Agent[None, str]:
    default_model = REVIEW_MODEL if session.cwd.name == "review" else FAST_MODEL
    return Agent(
        default_model,
        name=f"factory-{session.cwd.name}",
        system_prompt="You are a session-aware ACP example.",
    )


config = AdapterConfig(
    allow_model_selection=True,
    available_models=[
        AdapterModel(model_id="fast", name="Fast", override=FAST_MODEL),
        AdapterModel(model_id="review", name="Review", override=REVIEW_MODEL),
    ],
    session_store=MemorySessionStore(),
)

run_acp(agent_factory=build_agent, config=config)

What It Adds Beyond The Minimal Example

• the active workspace can affect the default model
• session-local model switching is visible through ACP
• you still do not need a custom AgentSource

This is the right middle ground when the session matters but the runtime is still simple.