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It's incredible how many people don't realize this -- there is actually no .claudeignore file. Claude Code does not natively recognize any such file. |
And even your .gitignore is not as strictly respected as you might think -- there are much stronger ways to reliable ignore files and avoid revealing sensitive information and wasting tokens on irrelevant file data. |
Yes we already have .dockerignore and .npmignore and other kinds of .[x]ignore -- so it sounds like .claudeignore is a real thing. |
But it really isn't. |
But this misconception has spread across the internet -- even models like Claude have recommended a .claudeignore file even though it doesn't do anything. |
And what's the problem with .gitignore? |
Claude Code does respect .gitignore for some file discovery. |
It can hide ignored files from things like @-mention autocomplete. Claude Code also has settings that control whether tools like Glob respect .gitignore. |
This helps keep things like node_modules, build files and other junk out of normal searches. |
But .gitignore does not stop Claude from reading those files directly. |
If you tell Claude to “read .env” or “check dist/output.log” it can still try to read them. |
Claude can accidentally read sensitive files like API keys and production credentials. It can also read huge ignored files like logs or generated output. That can waste a lot of tokens and fill the context window with useless data. |
So .gitignore can help with file discovery. It does not give you a hard security barrier. |
How to actually make Claude ignore files properly |
There are three good ways to do it. |
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