Subagent invocation fails with "unable to find agent" for agent that exists and is listed

[ssedano]

Bug

InvokeSubagents with agent_name: "divedeep" returns:
"unable to find agent with name: divedeep"

Expected

Invocation should succeed since the agent is found by ListAgents and /agent swap.

Steps

1. Agent configured at ~/.kiro/agents/divedeep.json
2. ListAgents → divedeep appears ✅
3. /agent swap divedeep → works ✅
4. InvokeSubagents with agent_name "divedeep" → fails ❌

Config

• divedeep is in availableAgents and trustedAgents in the parent agent's toolsSettings
• Agent has custom MCP servers (builder-mcp, aws-coe, workplace-chat-mcp)
• Reproducible 100% of the time