Crash: Cannot read properties of undefined (reading 'command') in isSearchOrReadCommand with custom ANTHROPIC_BASE_URL

Bug description

When using ANTHROPIC_BASE_URL pointed at a local llama-server (OpenAI/Anthropic-compatible), Claude Code crashes if the model emits a tool call with undefined/missing input parameters.

Stack trace

ERROR  Cannot read properties of undefined (reading 'command')

 Object.isSearchOrReadComma (cli.js:2976:2952)
 JJ6 (cli.js:3971:593)
 og8 (cli.js:3971:1214)
 HYY (cli.js:3971:2411)
 fZK (cli.js:3972:2435)

Steps to reproduce

1. Set ANTHROPIC_BASE_URL to a local llama-server (e.g., llama.cpp server with --reasoning-format deepseek)
2. Enable CLAUDE_CODE_USE_POWERSHELL_TOOL=1 in settings.json
3. Use a local model that occasionally emits malformed tool calls (e.g., PowerShell tool call with empty/missing input)
4. Claude Code crashes in the TUI display layer while trying to render the pending tool call

Root cause

isSearchOrReadCommand(q) guards with if (!q.command) but crashes when q itself is undefined. The null check should be if (!q?.command).

The crash occurs in the TUI display layer (collapsible tool-use renderer), not in tool execution — Claude Code crashes while deciding how to display the tool call, before it even attempts to run it.

Workaround

Set CLAUDE_CODE_USE_POWERSHELL_TOOL=0 for local model sessions to remove the PowerShell tool entirely.

Environment

• Claude Code installed via npm (latest)
• Windows 11 Pro
• llama-server with Qwen3.5 models via ANTHROPIC_BASE_URL=http://localhost:1237
• llama-server serves both /v1/chat/completions (OpenAI) and /v1/messages (Anthropic) endpoints natively