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download_object

Download files from a Google Cloud Storage bucket by specifying the project ID, bucket name, file name, and local save path. Simplify file retrieval for GCP resources.

Instructions

    Download a file from a Cloud Storage bucket.
    
    Args:
        project_id: The ID of the GCP project
        bucket_name: The name of the bucket to download from
        source_blob_name: The name of the file in the bucket
        destination_file_path: The local path to save the file to
    
    Returns:
        Result of the download operation
    

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
bucket_nameYes
destination_file_pathYes
project_idYes
source_blob_nameYes

Implementation Reference

  • The handler function for the 'download_object' tool, decorated with @mcp.tool(). It downloads a specified blob from a GCP Cloud Storage bucket to a local destination file path using the google.cloud.storage client.
        @mcp.tool()
        def download_object(project_id: str, bucket_name: str, source_blob_name: str, destination_file_path: str) -> str:
            """
            Download a file from a Cloud Storage bucket.
            
            Args:
                project_id: The ID of the GCP project
                bucket_name: The name of the bucket to download from
                source_blob_name: The name of the file in the bucket
                destination_file_path: The local path to save the file to
            
            Returns:
                Result of the download operation
            """
            try:
                from google.cloud import storage
                
                # Initialize the Storage client
                client = storage.Client(project=project_id)
                
                # Get the bucket
                bucket = client.get_bucket(bucket_name)
                
                # Get the blob
                blob = bucket.blob(source_blob_name)
                
                # Download the file
                blob.download_to_filename(destination_file_path)
                
                return f"""
    File successfully downloaded:
    - Source: gs://{bucket_name}/{source_blob_name}
    - Destination: {destination_file_path}
    - Size: {blob.size / (1024 * 1024):.2f} MB
    - Content-Type: {blob.content_type}
    """
            except Exception as e:
                return f"Error downloading file: {str(e)}"
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries the full burden of behavioral disclosure. It states the tool downloads a file but doesn't describe key behaviors: whether it overwrites existing local files, handles errors (e.g., missing files or permissions), supports partial downloads, or has rate limits. For a mutation tool (file download implies local write), this lack of detail is a significant gap.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is well-structured and front-loaded with the core purpose, followed by parameter details. It uses clear sections (Args, Returns) and avoids unnecessary words. However, the 'Returns' statement ('Result of the download operation') is vague and could be more informative, slightly reducing efficiency.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's complexity (file download with 4 parameters), lack of annotations, and no output schema, the description is incomplete. It doesn't explain the return value format, error handling, or behavioral nuances (e.g., file overwriting). For a tool that performs I/O operations, more context is needed to ensure safe and correct usage.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The description lists all four parameters with brief explanations (e.g., 'The name of the bucket to download from'), adding meaning beyond the schema, which has 0% description coverage. However, it doesn't provide format details (e.g., path syntax, blob naming conventions) or examples, leaving some ambiguity. Since schema coverage is low, the description compensates partially but not fully.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool's purpose: 'Download a file from a Cloud Storage bucket.' It specifies the verb ('download') and resource ('file from a Cloud Storage bucket'), making the action clear. However, it doesn't explicitly differentiate from sibling tools like 'upload_object' or 'delete_object' beyond the obvious verb difference, which is why it's not a 5.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives. It doesn't mention prerequisites (e.g., authentication, permissions), when not to use it (e.g., for large files or streaming), or compare it to siblings like 'list_objects' for browsing or 'upload_object' for the opposite operation. This leaves the agent without context for tool selection.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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