How to guide agents to use subagents/custom agents and mcp tools to gather more context?

[jimitshah77]

• I don't see them using it by default.
• Any other way to invoke them?

[amondnet]

To encourage more proactive subagent use, include phrases like “use PROACTIVELY” or “MUST BE USED” in your description field.

https://docs.anthropic.com/en/docs/claude-code/sub-agents#using-subagents-effectively

Add these to your main Claude.md or Agents.md:

Always use Claude Code sub-agents for research before implementing.