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feat: add append mode to file_write tool #493

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feat: add append mode to file_write tool #493

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13 changes: 11 additions & 2 deletions src/strands_tools/file_write.py
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Original file line number Diff line number Diff line change
Expand Up @@ -82,6 +82,12 @@
"type": "string",
"description": "The content to write to the file",
},
"mode": {
"type": "string",
"description": "Write mode: 'w' (default) to overwrite, 'a' to append to existing content",
"enum": ["w", "a"],
"default": "w",
},
},
"required": ["path", "content"],
}
Expand Down Expand Up @@ -168,6 +174,7 @@ def file_write(tool: ToolUse, **kwargs: Any) -> ToolResult:
- path: The path to the file to write. User paths with tilde (~)
are automatically expanded.
- content: The content to write to the file.
- mode: Write mode - 'w' (default) to overwrite, 'a' to append.
**kwargs: Additional keyword arguments (not used currently)

Returns:
Expand Down Expand Up @@ -257,10 +264,12 @@ def file_write(tool: ToolUse, **kwargs: Any) -> ToolResult:
)

# Write the file
with open(path, "w") as file:
mode = tool.get("input", {}).get("mode", "w")
with open(path, mode) as file:
file.write(content)

success_message = f"File written successfully to {path}"
action = "appended to" if mode == "a" else "written successfully to"
success_message = f"Content {action} {path}"
success_panel = Panel(
Text(success_message, style="bold green"),
title="[bold green]Write Successful",
Expand Down
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