Create a new workflow run in draft status.

Create a plan graph (DAG of tasks) for an existing run.

Cancel downstream tasks from anchor and replace with new tasks.

Return tasks that are ready and not currently claimed.

Claim a ready task for exclusive execution.

Transition a task to running status.

Mark a task completed and activate dependent tasks.

Mark a task failed, with optional retry logic.

Block a task pending human approval.

Resume a blocked task after human decision.

Store working or final output for a task.

Save a checkpoint for a running task.

Retrieve all payload data (input, output, checkpoint, contract) for a task.

Return full state of a single task.

List tasks for a run with optional filters.

Return workflow run state.

Return all blocked tasks for a run.

Return all DAG edges for a run.

Validate a task's output against its JSON Schema contract.

Validate that a task list forms an acyclic DAG.

Get task details from the executing agent's perspective.

Update working output and optionally checkpoint progress.

Submit final output and mark task completed.

Request human input, blocking the task until decided.