Configure resources and regions

Choose compute and placement for Devin session workloads.

Set the resources for the Devin workspace by passing standard Modal Sandbox options to run_session() in the generated application:

def session(session_id: str) -> None:
    worker.run_session(
        session_id,
        app=app,
        image=image,
        cpu=4,
        memory=8192,
        region="eu-west",
    )

These options control the Sandbox where Devin runs commands and edits the project. The installed Modal SDK determines which Sandbox.create options are available. See Modal’s general resource configuration guide for request, limit, and billing semantics.

Configure orchestration policy

The surrounding Modal function manages the session lifecycle. Use its decorator for placement policy when needed. Add Modal function retries only deliberately: each retry is a fresh claim attempt with a new acceptor identity.

@app.function(
    name="session",
    image=image,
    secrets=[devin_secret],
    timeout=worker.session_function_timeout_seconds,
    region="eu-west",
)
def session(session_id: str) -> None:
    worker.run_session(
        session_id,
        app=app,
        image=image,
        cpu=4,
        memory=8192,
        region="eu-west",
    )

These are two different placements: the function’s region places the lightweight orchestration call itself, while the Sandbox’s region places where Devin runs commands and edits files. Most deployments only need to set region on the Sandbox. Set it on the function too only when you also want the orchestration call co-located, for example alongside a database or internal service it depends on. When constraining both, choose compatible regions and capacity available to your Modal workspace.

Managed options

Pass only keyword options other than timeout, workdir, or readiness_probe to run_session(). modal-devin manages those values so it can start, preserve, and clean up the session safely.

Use WorkerSettings to change supported lifecycle timing. Keep the function timeout at least worker.session_function_timeout_seconds.

Scheduler policy

Edit the generated scheduler decorator to change its region or schedule. Keep max_containers=1; it is required for safe dispatch with the current runtime.