@ancient-wolf-19325 Can you use conditionals w/ custom Agent tasks? I'd like to pass the output of a conditional into the agent task. Show examples

Yes, you can use Flyte conditionals with custom Agent tasks, and you can pass the output of a conditional directly into an agent (custom task) as an input. The conditional construct in Flyte returns a value (Promise) that can be used as an input to downstream tasks, including custom agent tasks, as long as the types are compatible. This is a standard pattern in Flyte workflows and is supported for all task types, including custom agent tasks implemented via plugins or the agent interface. However, the data sources do not provide a specific example with a custom agent task, but the pattern is identical to using conditionals with any other task type (source, source). Here is a generic example using a conditional whose output is passed to a downstream task (replace

agent_task

with your custom agent task):

from flytekit import task, workflow, conditional

@task
def t1(x: int) -> int:
    return x + 1

@task
def t2(x: int) -> int:
    return x * 2

# Replace this with your custom agent task
@task
def agent_task(y: int) -> str:
    return f"Agent received: {y}"

@workflow
def wf(cond: bool) -> str:
    result = (
        conditional("choose")
        .if_(cond.is_true())
        .then(t1(x=5))
        .else_()
        .then(t2(x=5))
    )
    return agent_task(y=result)

Would you like more detail or a step-by-step breakdown? Sources: - Flytesnacks conditional example - https://www.union.ai/docs/flyte/user-guide/programming/conditionals/ 👍 0 button 👎 0 button 💡 Hint: Mention @runllm in the thread for followups.

@ancient-wolf-19325 Can the

t1

and

t2

themselves be agent tasks that don't spin up Pods?

Yes, both

t1

and

t2

can be agent tasks that do not spin up Pods. Flyte agent tasks are executed by long-running agent services via gRPC, not by launching new Kubernetes Pods, and can be used in any part of a workflow, including within conditionals (source, source). The conditional construct is agnostic to the underlying task type, so as long as your agent tasks are properly registered and return compatible types, they can be used in conditionals and their outputs can be passed downstream. Would you like a concrete code example using agent tasks in this pattern? Sources: - https://www.union.ai/docs/flyte/user-guide/core-concepts/tasks/ 👍 0 button 👎 0 button 💡 Hint: Mention @runllm in the thread for followups.

@ancient-wolf-19325 Yes, an example would be great. Currently, we get

Cannot pass output from task n0 that produces no outputs to a downstream task

when trying to use the output of the conditional in the

agent_task

This error occurs if your agent tasks (

t1

,

t2

) do not declare any outputs (i.e., their return type is

None

or missing), but you try to use their output as input to another task. In Flyte, for a conditional's output to be passed downstream, all branches (including agent tasks) must return a value of the same type (source, source). Here's a minimal example where both agent tasks return an

int

, and the output is passed to another agent task:

from flytekit import task, workflow, conditional

# Simulate agent tasks by using the @task decorator; in practice, use your agent task class
@task
def agent_t1(x: int) -> int:
    # Agent logic here
    return x + 1

@task
def agent_t2(x: int) -> int:
    # Agent logic here
    return x * 2

@task
def agent_task(y: int) -> str:
    return f"Agent received: {y}"

@workflow
def wf(cond: bool) -> str:
    result = (
        conditional("choose")
        .if_(cond.is_true())
        .then(agent_t1(x=5))
        .else_()
        .then(agent_t2(x=5))
    )
    return agent_task(y=result)

Make sure your agent tasks have a non-

None

return type and actually return a value. If you use custom agent task classes, ensure their

get_type_signature

and output interface are set correctly. Would you like more detail on agent task implementation or debugging this error? Sources: - Flytesnacks conditional example - https://www.union.ai/docs/flyte/user-guide/programming/conditionals/ 👍 0 button 👎 0 button 💡 Hint: Mention @runllm in the thread for followups.