[Bug] System prompt directive to disable fable subagents not respected
Status Open
Reported on v2.1.241
Maintainer reply None cached
Activity 0 comments · opened Aug 25, 2026
Bug Description
claude ignored system level prompt to not use fable as subagents
Environment Info
- Platform: darwin
- Terminal: Apple_Terminal
- Version: 2.1.241
- Feedback ID: 05998b4f-b013-4664-bb18-8030714054bb
Errors
[{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"output_config.effort 'xhigh' is not supported when thinking is disabled on this model. Use effort 'high' or below, or enable thinking.\"},\"request_id\":\"req_011CeNFcnnu3MXEP5oQ4ZvcU\"}\n at generate (/$bunfs/root/cli:39:39492)\n at makeRequest (/$bunfs/root/cli:90:8063)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-08-24T21:05:07.772Z"}]