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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.20 27 Jan 2026

Debug Logging to File

What

New --debug-file CLI flag writes debug logs to a specific file path.

Usage

claude --debug-file /path/to/debug.log
claude --debug-file=/path/to/debug.log

Details

Implicitly enables debug mode when specified
Useful for persistent debugging and troubleshooting

Evidence

Argument parser at line 2836 (if (K.startsWith("--debug-file="))) and help text at line 577087 ("--debug-file <path>")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.20 →