What
The Edit tool is what Claude uses to change a file by swapping one exact piece of text for another. Claude Code sends Claude a short description of each tool, which tells Claude what the tool does and how to use it.
The Edit tool's description has been rewritten. Its opening line used to read "Performs exact string replacements in files." It now reads "Performs exact string replacement in a file." The new wording describes one replacement in one file, where the old wording described several replacements across several files.
Why
The tool descriptions are part of Claude's instructions, so a change to their wording can change how Claude goes about editing. In practice the new line frames each edit as a single change to a single file.
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The prompt record lists the Edit description as unchanged since v2.1.283, which conflicts with the rewrite reported between v2.1.283 and…