PROMPT_EXPERIMENT_ALREADY_ACTIVE
409invalid_requestAn experiment is already running for that agent.
Cause
Only one experiment may be active per agent_type; concurrent experiments contaminate each other’s readouts.
How to fix it
Stop the running experiment, then create the new one.
Example response
409 PROMPT_EXPERIMENT_ALREADY_ACTIVE
JSON
{
"error_code": "PROMPT_EXPERIMENT_ALREADY_ACTIVE",
"error_type": "invalid_request",
"error_message": "An experiment is already running for that agent.",
"hint": "Stop the running experiment, then create the new one.",
"docs_url": "https://docs.billerapi.com/errors/PROMPT_EXPERIMENT_ALREADY_ACTIVE",
"request_id": "d94f5e2a-8c3b-4f1e-9a7d-6b2c1e0f8a34"
}Related
- Error handling — the error envelope shape and how to parse it
- Error code reference — every stable error code
Canonical docs URL: https://docs.billerapi.com/errors/PROMPT_EXPERIMENT_ALREADY_ACTIVE
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