[Bug] Claude Code creates 'nul' files on Windows due to reserved filename handling

Bug Description
Claude code continuously creates 'nul' files in windows. Some commands make it do that. It's annoying because nul is a reserved file name in windows so I have to delete that file via git bassh manually. Please fix this

Environment Info

• Platform: win32
• Terminal: windows-terminal
• Version: 2.0.76
• Feedback ID: c4be564b-e3b1-49a1-830a-8de2360a6289

Errors

[{"error":"AxiosError: Request failed with status code 401\n    at bx (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:56:1137)\n    at IncomingMessage.<anonymous> (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:57:9852)\n    at IncomingMessage.emit (node:events:519:35)\n    at IncomingMessage.emit (node:domain:489:12)\n    at endReadableNT (node:internal/streams/readable:1701:12)\n    at process.processTicksAndRejections (node:internal/process/task_queues:90:21)\n    at fzA.request (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:59:2130)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async UT2 (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1845:3609)","timestamp":"2026-01-07T17:11:04.594Z"},{"error":"AxiosError: Request failed with status code 401\n    at bx (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:56:1137)\n    at IncomingMessage.<anonymous> (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:57:9852)\n    at IncomingMessage.emit (node:events:519:35)\n    at IncomingMessage.emit (node:domain:489:12)\n    at endReadableNT (node:internal/streams/readable:1701:12)\n    at process.processTicksAndRejections (node:internal/process/task_queues:90:21)\n    at fzA.request (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:59:2130)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async L17 (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:2614:9071)\n    at async file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:2614:9964","timestamp":"2026-01-07T17:11:05.688Z"},{"error":"Error: File content (439.4KB) exceeds maximum allowed size (256KB). Please use offset and limit parameters to read specific portions of the file, or use the GrepTool to search for specific content.\n    at Object.call (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:1027:973)\n    at Au5 (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:2207:17446)","timestamp":"2026-01-07T17:11:43.671Z"},{"error":"Error: Tool mcp__posthog__search_events not found\n    at wi2 (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:2591:6696)\n    at h5 (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:252:20693)\n    at IY (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:252:39057)\n    at ss (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:252:49664)\n    at MJ (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:252:85801)\n    at Xf (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:252:84781)\n    at u_ (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:252:84606)\n    at cS (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:252:81054)\n    at m0 (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:252:6240)\n    at Immediate.ip1 [as _onImmediate] (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:245:3491)","timestamp":"2026-01-07T17:12:01.270Z"},{"error":"Error: Tool mcp__posthog__search_events not found\n    at wi2 (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:2591:6696)\n    at h5 (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:252:20693)\n    at IY (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:252:39057)\n    at ss (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:252:49664)\n    at MJ (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:252:85801)\n    at Xf (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:252:84781)\n    at u_ (file:///C:/Users/User/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:252:84606)\n    at cS (file:///C:/Users/User/AppData/Roaming/

Note: Error logs were truncated.