Edit tool description
CLI Claude Code, interactive mode, seeded with anonymous feature flags, v2.1.284. The text the model is given for this tool, line by line, with each line marked against the previous capture taken the same way. 15 model strings share this prompt, byte for byte.
Lines91,094 characters
Moved+0−0 against v2.1.283
Sent to15model strings get this description
Copies2distinct descriptions under this name
Parameters43 of them required
Every tool→every description on this arm
2 genuinely different descriptions of this tool
Plain text · sha256 f907faa95966
The description, line by line
9 lines Line numbers are v2.1.283 on the left and this capture on the right.
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Performs exact string replacements in files.
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Usage:
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- You must use your `Read` tool at least once in the conversation before editing. This tool will error if you attempt an edit without reading the file.
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- When editing text from Read tool output, ensure you preserve the exact indentation (tabs/spaces) as it appears AFTER the line number prefix. The line number prefix format is: line number + tab. Everything after that is the actual file content to match. Never include any part of the line number prefix in the old_string or new_string.
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- ALWAYS prefer editing existing files in the codebase. NEVER write new files unless explicitly required.
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- Only use emojis if the user explicitly requests it. Avoid adding emojis to files unless asked.
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- The edit will FAIL if `old_string` is not unique in the file. Either provide a larger string with more surrounding context to make it unique or use `replace_all` to change every instance of `old_string`.
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- Use `replace_all` for replacing and renaming strings across the file. This parameter is useful if you want to rename a variable for instance.
What it accepts
4 parameters The JSON parameter schema sent beside this description, 654 characters of it. Name, type, then whether the client marked it required.file_path
string
required
The absolute path to the file to modify
new_string
string
required
The text to replace it with (must be different from old_string)
old_string
string
required
The text to replace
replace_all
boolean
optional
Replace all occurrences of old_string (default false)
sha256 9748c75edc64 · the schema as the client sent it:
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"additionalProperties": false,
"properties": {
"file_path": {
"description": "The absolute path to the file to modify",
"type": "string"
},
"new_string": {
"description": "The text to replace it with (must be different from old_string)",
"type": "string"
},
"old_string": {
"description": "The text to replace",
"type": "string"
},
"replace_all": {
"default": false,
"description": "Replace all occurrences of old_string (default false)",
"type": "boolean"
}
},
"required": [
"file_path",
"old_string",
"new_string"
],
"type": "object"
}