Collect candidate scripts and rank likely signature-generation functions for a target parameter.
AI agents call locate_signature_function to retrieve information from JS Reverse MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool performs reverse engineering analysis by examining existing code and identifying signature functions. While it operates in a security-sensitive domain (analyzing authentication mechanisms), it only reads and categorizes data.
From the tool's definition Tool description states 'Collect candidate scripts and rank likely signature-generation functions' — this is a search/analysis operation that retrieves and ranks data without modifying state.
Attacks that exploit this kind of access
Collect candidate scripts and rank likely signature-generation functions for a target parameter. It is categorised as a Read tool in the JS Reverse MCP MCP Server, which means it retrieves data without modifying state.
Register the JS Reverse MCP server in PolicyLayer and add a rule for locate_signature_function: 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 JS Reverse MCP. Nothing to install.
locate_signature_function 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 locate_signature_function 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 locate_signature_function. 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.
locate_signature_function is provided by the JS Reverse MCP server (noone-hub/jsreverser-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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