[Bug] Agentic Code Generation Fails: Incorrect File Handling and Context Retrieval

Bug Description
Lobotomy Claude is back. It hunted around the codebase looking for code that was right in front of it. It guessed on insertion points for new code. It tried writing to files it hadn't read yet. It got tool errors repeatedly until it finally read the file. I feel like I'm using quant2 Haiku.

Environment Info

• Platform: darwin
• Terminal: Apple_Terminal
• Version: 1.0.113
• Feedback ID: f72fb25f-d15a-46ba-b188-02b71b19b798

Errors

[{"error":"Error: Language not supported while highlighting code, falling back to markdown: \n    at uV (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1770:1184)\n    at file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1770:2176\n    at Array.map (<anonymous>)\n    at uV (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1770:2147)\n    at file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1770:2063\n    at Array.map (<anonymous>)\n    at uV (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1770:2052)\n    at file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1770:912\n    at Array.map (<anonymous>)\n    at EX (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1770:903)","timestamp":"2025-09-15T17:52:27.213Z"},{"error":"Error: Language not supported while highlighting code, falling back to markdown: \n    at uV (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1770:1184)\n    at file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1770:2176\n    at Array.map (<anonymous>)\n    at uV (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1770:2147)\n    at file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1770:2063\n    at Array.map (<anonymous>)\n    at uV (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1770:2052)\n    at file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1770:912\n    at Array.map (<anonymous>)\n    at EX (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1770:903)","timestamp":"2025-09-15T17:52:27.566Z"}]