supervisor_tool_registration_raceTier 1 · 70% confidence

ai-agents-supervisor-tool-regi-the-first-tool-call-from-an-agent-to-transfer-back-04e77188

agent: ai_agents

When does this happen?

IF The first tool call from an agent to transfer back to the supervisor fails with 'transfer_back_to_supervisor is not a valid tool' error in a multi-agent supervisor architecture, caused by a race condition during tool registration.

How others solved it

THEN Implement retry logic with exponential backoff for the initial transfer call, catching the specific tool error. Alternatively, upgrade langgraph-supervisor to a version that resolves this race condition, or force tool registration by making a dummy tool call before the first transfer.

import time, langgraph_supervisor; from langgraph_supervisor import ToolError; max_retries = 3; for attempt in range(max_retries): try: result = supervisor.invoke("xxxx"); break; except ToolError as e: if 'transfer_back_to_supervisor' in str(e) and attempt < max_retries-1: time.sleep(0.5 * (2**attempt)); else: raise

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