[Bug] Anthropic API Error 400 when generating instructions from current session

Bug Description
claude code returns API Error 400 when asked to generate instructions based on current session

Prompt

Generate efficient instructions so you can perform this task in the future without input, perhaps it can be used as a skill.

Output

API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages.5.content.149: thinking or redacted_thinking blocks in the latest assistant message cannot be modified. These blocks must remain as they were in the original response."},"request_id":"req_011CXYQH9pfypcNe2ExEAZXS"}

Environment Info

• Platform: darwin
• Terminal: iTerm.app
• Version: 2.1.20
• Feedback ID: 7f938ced-69f7-4786-8b84-0f5e1ac60433

Errors

[{"error":"Error: ENOENT: no such file or directory, scandir '/Library/Application Support/ClaudeCode/.claude/skills'\n    at readdirSync (unknown)\n    at <anonymous> (/$bunfs/root/claude:12:2063)\n    at oW (/$bunfs/root/claude:11:35584)\n    at readdirSync (/$bunfs/root/claude:12:2024)\n    at MIR (/$bunfs/root/claude:1758:380)\n    at MIR (/$bunfs/root/claude:1758:1350)\n    at <anonymous> (/$bunfs/root/claude:1758:4670)\n    at <anonymous> (/$bunfs/root/claude:1758:5401)\n    at A (/$bunfs/root/claude:11:7259)\n    at fw8 (/$bunfs/root/claude:4826:4342)","timestamp":"2026-01-27T18:16:34.635Z"},{"error":"Error: ENOENT: no such file or directory, scandir '/Users/kamil/.claude/skills'\n    at readdirSync (unknown)\n    at <anonymous> (/$bunfs/root/claude:12:2063)\n    at oW (/$bunfs/root/claude:11:35584)\n    at readdirSync (/$bunfs/root/claude:12:2024)\n    at MIR (/$bunfs/root/claude:1758:380)\n    at MIR (/$bunfs/root/claude:1758:1350)\n    at <anonymous> (/$bunfs/root/claude:1758:4713)\n    at <anonymous> (/$bunfs/root/claude:1758:5401)\n    at A (/$bunfs/root/claude:11:7259)\n    at fw8 (/$bunfs/root/claude:4826:4342)","timestamp":"2026-01-27T18:16:34.635Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"output_config: Extra inputs are not permitted\"},\"request_id\":\"req_011CXYLsgvRhBpcEiqeT8gkZ\"}\n    at generate (/$bunfs/root/claude:145:37631)\n    at makeRequest (/$bunfs/root/claude:162:5435)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-27T18:18:46.729Z"},{"error":"SyntaxError: JSON Parse error: Unexpected identifier \"API\"\n    at <parse> (:0)\n    at parse (unknown)\n    at <anonymous> (/$bunfs/root/claude:70:855)\n    at A (/$bunfs/root/claude:11:7259)\n    at Wt_ (/$bunfs/root/claude:1540:40110)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-27T18:18:46.729Z"},{"error":"TelemetrySafeError: Message with ID \"Non-stop from Chicago to San Diego (& vice versa) for only $157 roundtrip\" not found\n    at me_ (/$bunfs/root/claude:1580:35198)\n    at async call (/$bunfs/root/claude:1580:50020)\n    at async GO8 (/$bunfs/root/claude:3034:12583)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-27T18:20:52.895Z"},{"error":"AbortError: The operation was aborted.\n    at unknown\n    at abortChildProcess (node:child_process:935:42)\n    at onAbortListener2 (node:child_process:35:24)\n    at abort (unknown)\n    at <anonymous> (/$bunfs/root/claude:5165:2153)","timestamp":"2026-01-27T18:21:56.662Z"},{"error":"Error: ENOENT: no such file or directory, scandir '/Library/Application Support/ClaudeCode/.claude/skills'\n    at readdirSync (unknown)\n    at <anonymous> (/$bunfs/root/claude:12:2063)\n    at oW (/$bunfs/root/claude:11:35584)\n    at readdirSync (/$bunfs/root/claude:12:2024)\n    at MIR (/$bunfs/root/claude:1758:380)\n    at MIR (/$bunfs/root/claude:1758:1350)\n    at <anonymous> (/$bunfs/root/claude:1758:4670)\n    at <anonymous> (/$bunfs/root/claude:1758:5401)\n    at A (/$bunfs/root/claude:11:7259)\n    at fw8 (/$bunfs/root/claude:4826:4342)","timestamp":"2026-01-27T18:27:47.463Z"},{"error":"Error: ENOENT: no such file or directory, scandir '/Users/kamil/.claude/skills'\n    at readdirSync (unknown)\n    at <anonymous> (/$bunfs/root/claude:12:2063)\n    at oW (/$bunfs/root/claude:11:35584)\n    at readdirSync (/$bunfs/root/claude:12:2024)\n    at MIR (/$bunfs/root/claude:1758:380)\n    at MIR (/$bunfs/root/claude:1758:1350)\n    at <anonymous> (/$bunfs/root/claude:1758:4713)\n    at <anonymous> (/$bunfs/root/claude:1758:5401)\n    at A (/$bunfs/root/claude:11:7259)\n    at fw8 (/$bunfs/root/claude:4826:4342)","timestamp":"2026-01-27T18:27:47.463Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"output_config: Extra inputs are not permitted\"},\"request_id\":\"req_011CXYMZZR6eAev1QC8Dmngk\"}\n    at generate (/$bunfs/root/claude:145:37631)\n    at makeRequest (/$bunfs/root/claude:162:5435)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-27T18:27:47.560Z"},{"error":"SyntaxError: JSON Parse error: Unexpected identifier \"API\"\n    at <parse> (:0)\n    at parse (unknown)\n    at…

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