[Bug] Anthropic API Error: Invalid Model Name 'composer-2.5-fast' in Subagent Frontmatter
Status Open
Reported on v2.1.260
Maintainer reply None cached
Activity 0 comments · opened Sep 4, 2026
Bug Description
[ Subagent model frontmatter value unrecognized by Claude Code hard-errors (404) instead of fal… │
│ │ What happened: Spawning a subagent whose frontmatter sets model: composer-2.5-fast (a Cursor-specific slug) failed with: "There's an issue with the select…]
Environment Info
- Platform: darwin
- Terminal: Apple_Terminal
- Version: 2.1.260
- Feedback ID: e8bd8c60-231c-4f49-bdd8-2641ada21e2b
Errors
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