AI agents call sigsci_list_tool_categories to retrieve information from Sigsci without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves or queries available categories and tools without side effects. It is purely informational and falls squarely into the Read category. The low severity reflects that disclosure of tool metadata poses minimal security risk.
From the tool's definition Tool name contains 'list' and description states 'List available tool categories and their tools' — a straightforward enumeration of metadata with no mutation, deletion, or execution of code/commands.
Attacks that exploit this kind of access
List available tool categories and their tools. It is categorised as a Read tool in the Sigsci MCP Server, which means it retrieves data without modifying state.
Register the Sigsci MCP server in PolicyLayer and add a rule for sigsci_list_tool_categories: 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 Sigsci. Nothing to install.
sigsci_list_tool_categories 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 sigsci_list_tool_categories 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 sigsci_list_tool_categories. 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.
sigsci_list_tool_categories is provided by the Sigsci MCP server (yuki777/sigsci-mcp-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.
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