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Multi-Agent Synthesis Fix

Date: 2026-01-22 Status: 🟢 In-use Author: Sri Aradhyula <sraradhy@cisco.com>

Summary​

Fixed an issue where the supervisor's final answer only contained the last sub-agent's response instead of a synthesized summary from all agents when multiple agents were invoked.

Motivation​

When a user query required multiple agents (e.g., "get apps for CAIPE, search for CAIPE in RAG, look for info for cnoe-io/ai-platform-engineering"), the system would:

  1. Stream content from ALL agents correctly (user sees all results)
  2. But return only the LAST agent's response as the final answer

Root Cause​

The sub_agent_complete boolean flag in StreamState was blocking all streaming after the first sub-agent completed:

# OLD CODE - PROBLEMATIC
if state.sub_agent_complete:
    logger.info("🛑 Skipping streaming chunk - sub-agent already sent complete_result")
    return  # Blocks ALL subsequent streaming!

This caused:

  1. First agent completes → sub_agent_complete = True
  2. Second agent's streaming chunks → SKIPPED
  3. Third agent's streaming chunks → SKIPPED
  4. Supervisor's synthesis → SKIPPED

The _get_final_content() method would then return only the first agent's content (from artifact-updates), not the supervisor's synthesis.

Testing Strategy​

Tested with query: "get apps for CAIPE, search for CAIPE in RAG, look for info for cnoe-io/ai-platform-engineering"

Expected result: Final answer contains synthesized summary from all three agents (ArgoCD, RAG, GitHub).