download_file_from_gcs
AI agents call download_file_from_gcs to retrieve information from FFmpeg MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves data from cloud storage without modifying or deleting it. While the description is empty (lowering confidence slightly), the tool name and server context make the read classification clear. Severity is medium rather than low because unrestricted access to GCS could expose sensitive data stored in cloud buckets, depending on access controls and what files exist there.
From the tool's definition Tool name 'download_file_from_gcs' indicates retrieval of files from Google Cloud Storage. Sibling tools include 'get_file' and 'upload_file_to_gcs', positioning this as a data retrieval operation.
Attacks that exploit this kind of access
download_file_from_gcs. It is categorised as a Read tool in the FFmpeg MCP Server MCP Server, which means it retrieves data without modifying state.
Register the FFmpeg MCP Server MCP server in PolicyLayer and add a rule for download_file_from_gcs: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches FFmpeg MCP Server. Nothing to install.
download_file_from_gcs is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the download_file_from_gcs rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for download_file_from_gcs. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
download_file_from_gcs is provided by the FFmpeg MCP Server MCP server (radzevich/ffmpeg_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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