[Bug] Subagent instruction deviation causes excessive token consumption in larger codebases

Bug Description
Impacto de créditos baixo neste caso, mas o mesmo padrão de desvio de instruções num subagente pode tornar-se bem mais dispendioso em repositórios maiores ou com mais camadas a reescrever.

Environment Info

• Platform: win32
• Terminal: windows-terminal
• Version: 2.1.263
• Feedback ID: c0250de6-dcc0-4408-901c-724981366f37

Errors

[{"error":"TelemetrySafeError: VirtualMessageList: itemKeys/messages length desync (keys=27 messages=26 range=[0,27))\n    at jQt (B:/~BUN/root/chunk-w2v99rzn.js:36:27375)\n    at whe (B:/~BUN/root/chunk-w2v99rzn.js:36:20207)\n    at Br (B:/~BUN/root/chunk-nggm72vf.js:18:20178)\n    at zu (B:/~BUN/root/chunk-nggm72vf.js:18:38344)\n    at Ih (B:/~BUN/root/chunk-nggm72vf.js:18:84425)\n    at Wg (B:/~BUN/root/chunk-nggm72vf.js:18:83425)\n    at ic (B:/~BUN/root/chunk-nggm72vf.js:18:83254)\n    at jh (B:/~BUN/root/chunk-nggm72vf.js:18:79779)\n    at qe (B:/~BUN/root/chunk-nggm72vf.js:18:6261)\n    at ke (B:/~BUN/root/chunk-nggm72vf.js:18:4792)","timestamp":"2026-09-06T10:04:38.674Z"},{"error":"Error: EnterPlanMode tool cannot be used in agent contexts\n    at call (B:/~BUN/root/chunk-wxm61xb2.js:2966:675)\n    at x6o (B:/~BUN/root/chunk-wxm61xb2.js:3220:2615)\n    at async run (B:/~BUN/root/chunk-wxm61xb2.js:1224:1643)\n    at async <anonymous> (B:/~BUN/root/chunk-m8qyvwrt.js:333:3860)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-09-06T10:06:25.951Z"}]