File Reading Functionality

1st chunk of `crates/assistant_tools/src/read_file_tool/description.md`

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Reads the content of the given file in the project.

- Never attempt to read a path that hasn't been previously mentioned.

Title: File Reading Functionality

Summary

This describes the function to read the contents of a specified file within the project. It emphasizes a constraint: the system will only attempt to read files whose paths have been explicitly mentioned beforehand.