Recorder
Claude Agent SDK
Each agent's query ends with a result message that carries its usage and cost. Record it once per agent.
- Copy
harness_recorder.pyinto your project. - Record each agent's result message as below.
Record a query
from harness_recorder import Recorder, usage_from
run = Recorder("claims-settlement", "3.0.0").start_run(claim_id)
with run.agent("settle", prompt_ref="prompts/settlement-calculator@3", model="anthropic/claude-sonnet-5") as step:
async for message in query(prompt=task, options=options):
if type(message).__name__ == "ResultMessage":
step.model_call(**usage_from(message), cost_usd=message.total_cost_usd)
run.finish("completed")Where the log lands
Wherever your service logs go, or a folder.
How it reaches the harness
You download the logs with your own access.