Subagents created with enableMCP=false had toolSession.mcpManager
unset, causing depth-2+ sub-subagents to re-discover and spawn
duplicate MCP server processes.
- Add mcpManager option to CreateAgentSessionOptions
- Set toolSession.mcpManager unconditionally after MCP block
- Pass options.mcpManager from executor to createAgentSession
- Guard callback registration: only wire onToolsChanged/onPromptsChanged/
onResourcesChanged when the session owns the manager (created via
discovery), not when reusing a parent's — prevents child sessions
from clobbering the parent's live MCP refresh handlers
Latent since 91da560cc (in-process subagent migration), observable
since f82a5d121 added task.maxRecursionDepth allowing depth-2 agents.
Miroslav Drbal
bf313a2acf