AI agents call sigsci_get_corp_rule 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 information about an existing rule configuration in Signal Sciences (Fastly NGWAF). It performs a query operation without modifying, deleting, or executing any code. The 'get' verb and read-only server characterization confirm it belongs in the Read category. Severity is low because it only accesses existing configuration data without affecting system operations.
From the tool's definition Tool name 'sigsci_get_corp_rule' contains 'get', and description states 'Get details of a specific rule' — a retrieval operation with no side effects. Server description confirms '40+ read-only tools'.
Attacks that exploit this kind of access
Get details of a specific rule in a corporation. 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_get_corp_rule: 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_get_corp_rule 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_get_corp_rule 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_get_corp_rule. 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_get_corp_rule 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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