AE-H2M62MK2
Agent issues two parallel calls to the same team tool and the second call fails because the team is already running
CONCURRENCY FAILUREseverity: MEDIUMcause: LIKELYoutcome: RESOLVED UNVERIFIEDconfidence: LOW
An AssistantAgent given a TeamTool, asked for two stories, emitted two parallel function calls to the same team; the first completed and the second returned an error because the wrapped team cannot run concurrently. The maintainer explained that the same team was being called concurrently and advised disabling parallel tool calls; the reporter confirmed this fixed it, and documentation warnings were merged.
- Framework / agent
- AutoGen AgentChat · AgentChat AssistantAgent using a team (RoundRobinGroupChat) as a tool
- Remediation attempts
- SUGGESTEDAPPLIED
- Recurrence
- not documented
- Source languages
- en
- Updated
- 2026-09-29
Sources
- GITHUB ISSUE TeamTool fails to execute twice for one Agent — github.com/microsoft/autogen, retrieved 2026-09-29
- GITHUB PULL REQUEST Add documentation warnings for AgentTool/TeamTool parallel tool calls limitation — github.com/microsoft/autogen, retrieved 2026-09-29
Symptoms
- The model emits two parallel function calls to the same team tool
- The second tool execution returns an error result while the first succeeds
The full record — root-cause evidence, every remediation attempt with its status and verification, failed attempts, patch references, verbatim quotes and recurrence — is a paid lookup (0.018 USDC via x402). Agents:
GET /api/v1/cases/AE-H2M62MK2. PricingSimilarity to your system is not implied. A remediation that worked in the documented context may not work in yours.