Add default model guidance for subagent tool

Author: amolith Channel: #shelley Link: https://discord.com/channels/1405685085923049482/1450334528210993295/1481851461746036756

Summary

The subagent tool can choose which model to use, but it needs default guidance to select the appropriate model for different task types.

Context

From discussion about the subagent tool's model selection capability:

I gave the subagent tool the capacity to choose which model to use, and it's either explicitly or implicitly using the wrong one. In the short term, telling it in agents.md to use the same model always may work.

Proposed Model Selection Guidelines

Based on user experience:

• GLM 4.7: Shell commands, reading logs, git history, simple tasks
• Sonnet: Straightforward code implementation
• Opus: Implementation requiring more judgment
• GPT 5.4: Thinking partner for ideas and plans (note: has tendency to over-engineer)

Requirements

1. Document default model selection guidance in agents.md
2. Implement model selection logic based on task type
3. Allow users to disable built-in models (separate but related requirement)