is_active
AI agents call is_active to retrieve information from MCP NIF PT without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool appears to read and return company status information without modifying data. Even with an empty description, the name and server context (which mentions 'checking company status') indicate a read-only query operation. Severity is low as status checks have no harmful side effects.
From the tool's definition Tool name 'is_active' combined with server purpose of querying Portuguese company information suggests a status-check operation. No description provided, but context indicates this likely checks company status/activity state.
Attacks that exploit this kind of access
is_active. It is categorised as a Read tool in the MCP NIF PT MCP Server, which means it retrieves data without modifying state.
Register the MCP NIF PT MCP server in PolicyLayer and add a rule for is_active: 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 NIF PT. Nothing to install.
is_active 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 is_active 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 is_active. 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.
is_active is provided by the MCP NIF PT MCP server (ruicarvalho1/mcp_nif). 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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