Analyze an image using the vision module (captioning, VQA, etc).
AI agents call farnsworth_vision to retrieve information from Farnsworth 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 visual data to produce analytical results (captions, answers to questions about images). It does not create, modify, delete, execute code, trigger external operations, or involve financial transactions. The operations are read-only in nature—analyzing existing image data and returning insights.
From the tool's definition The tool "farnsworth_vision" with description "Analyze an image using the vision module (captioning, VQA, etc)" performs image analysis operations.
Documented attack patterns abuse exactly the kind of access farnsworth_vision gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Farnsworth, and nothing reaches the server without passing your rules. This is the rule we recommend for farnsworth_vision:
{
"version": "1",
"default": "deny",
"tools": {
"farnsworth_vision": {}
}
}farnsworth_vision is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Analyze an image using the vision module (captioning, VQA, etc). It is categorised as a Read tool in the Farnsworth MCP Server, which means it retrieves data without modifying state.
Register the Farnsworth MCP server in PolicyLayer and add a rule for farnsworth_vision: 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 Farnsworth. Nothing to install.
farnsworth_vision 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 farnsworth_vision 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 farnsworth_vision. 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.
farnsworth_vision is provided by the Farnsworth MCP server (timowhite88/farnsworth). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 20 Farnsworth tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
20 Farnsworth tools catalogued and risk-classified — across an index of 42,500+ MCP servers.