Compare screenshots from two different URLs. Captures screenshots of both webpages and compares them pixel by pixel. Returns difference statistics and a diff image showing the visual differences.
AI agents call compare_urls to retrieve information from MCP Image Compare 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 compares data (screenshots and visual content) without causing side effects. It is a pure analysis tool used for regression testing. The screenshot capture is a read operation (no command execution on target systems), and the comparison generates reports without modifying any state. This fits the Read category profile of querying/retrieving data with no side effects.
From the tool's definition Tool 'compare_urls' captures screenshots and performs pixel-by-pixel comparison, returning 'difference statistics and a diff image'. No modification, deletion, execution of code, or financial operations occur—it only retrieves and analyzes visual data.
Attacks that exploit this kind of access
Compare screenshots from two different URLs. Captures screenshots of both webpages and compares them pixel by pixel. Returns difference statistics and a diff image showing the visual differences. It is categorised as a Read tool in the MCP Image Compare Server MCP Server, which means it retrieves data without modifying state.
Register the MCP Image Compare Server MCP server in PolicyLayer and add a rule for compare_urls: 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 MCP Image Compare Server. Nothing to install.
compare_urls 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 compare_urls 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 compare_urls. 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.
compare_urls is provided by the MCP Image Compare Server MCP server (leky90/mcp-image-compare-server). 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.
Teams ship this data inside their own products. See what a licence covers →