[Bug] Model ignores CLAUDE.md rules for file context requirements despite explicit instructions

Bug Description
Bug report drafted: Model repeatedly made confident behavioural claims from windowed file reads despite explicit CLAUDE.md rule requiring who… │ │ │ - What happened: User's CLAUDE.md states: "A grep/search hit is NOT evidence... read the whole file (caller, screen, navigator, hook) before any claim, plan…

Environment Info

• Platform: darwin
• Terminal: xterm-256color
• Version: 2.1.270
• Feedback ID: f29f2b1a-f5df-437b-a5a8-bbee749028fb

Errors

[{"error":"Error: 500 {\"type\":\"error\",\"error\":{\"type\":\"api_error\",\"message\":\"Internal server error\"},\"request_id\":\"req_011Cf5JCaqtbAfzixvuYDbZ1\"}\n    at generate (/$bunfs/root/chunk-bejv5wg3.js:11:14493)\n    at makeRequest (/$bunfs/root/chunk-bejv5wg3.js:51:8033)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-09-15T13:23:58.888Z"}]