update_file

Overwrite an existing file in a Bridge Town model and commit the change. The path is model-relative (e.g. ‘README.md’, ‘model/revenue.py’, ‘data/seed.csv’, ‘assets/logo.png’). This tool is strict update-only: if the file does not exist it returns a not-found error instructing you to use create_file instead. Specify branch to commit to a non-default branch (e.g.

Parameters

Name	Type	Required	Default	Description
model_name	Annotated[str, Field(description='Name of the Bridge Town model.')]	Yes	—
path	Annotated[str, Field(description='Model-relative path of the existing file to overwrite.')]	Yes	—
content	Annotated[str, Field(description="New file content as a UTF-8 string (when encoding='text') or base64-encoded bytes (when encoding='base64').")]	Yes	—
encoding	Annotated[Literal['text', 'base64'], Field(description="Encoding of the content field: 'text' for UTF-8 source (default); 'base64' for binary files. 'auto' is not allowed on writes.")]	No	'text'
commit_message	Annotated[str, Field(description='Git commit message. If omitted, the server generates a default message.')]	No	''
branch	`Annotated[str	None, Field(description=“Branch to operate on. Defaults to the model’s default branch when omitted or null.”)]`	No	None
expected_sha	Annotated[str, Field(description='Expected blob SHA-1 (40 hex chars) for optimistic concurrency control. If the file has been modified since you last read it, the call fails with a conflict error. Read the file first to get its current sha.')]	No	''

Returns

Returns a structured object. Top-level fields:

• path (string)
• model (string)
• commit_sha (string)

See the response example below for the full payload shape.

Example

Tool Call

{
  "name": "update_file",
  "arguments": {
    "model_name": "forecasts",
    "path": "model/revenue.py",
    "content": "def run(inputs):\n    return {\"revenue\": 1000}\n",
    "commit_message": "refactor: simplify revenue model",
    "expected_sha": "0123456789abcdef0123456789abcdef01234567"
  }
}

Response

{
  "path": "model/revenue.py",
  "model": "forecasts",
  "commit_sha": "abc1234def5678901234567890abcdef12345678"
}

Notes

• Module: Files
• Requires authentication via API token or Auth0 JWT.