caption_image
AI agents call caption_image to retrieve information from Computer Vision 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 and processes image data to generate text descriptions (captions), which is a read-only operation with no side effects. It queries external vision models to analyze images but does not modify, execute arbitrary commands, delete data, or commit financial transactions.
From the tool's definition Tool name 'caption_image' and server description states it 'Enables image captioning and analysis' and 'generating concise, descriptive captions' from images. No modification, deletion, code execution, or financial operations are described.
Attacks that exploit this kind of access
caption_image. It is categorised as a Read tool in the Computer Vision MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Computer Vision MCP Server MCP server in PolicyLayer and add a rule for caption_image: 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 Computer Vision MCP Server. Nothing to install.
caption_image 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 caption_image 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 caption_image. 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.
caption_image is provided by the Computer Vision MCP Server MCP server (samhains/cv-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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