Register a company in Nuvem Fiscal
AI agents use register_company to create or update resources in Mcp Ap2 — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Ap2 environment.
Registering a company creates new records in a fiscal database and has significant business implications (company registration, tax obligations, legal entity creation). However, it is reversible through administrative actions (company deregistration/closure), distinguishing it from Destructive. It does not involve financial transactions or money movement, so Financial does not apply.
From the tool's definition Tool performs 'Register a company' action which creates a new entity in Nuvem Fiscal (a fiscal/tax system). This is a data creation operation that modifies persistent state.
Documented attack patterns abuse exactly the kind of access register_company gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Ap2, and nothing reaches the server without passing your rules. This is the rule we recommend for register_company:
{
"version": "1",
"default": "deny",
"tools": {
"register_company": {
"limits": [
{
"counter": "register_company_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}register_company stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Register a company in Nuvem Fiscal. It is categorised as a Write tool in the Mcp Ap2 MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Mcp Ap2 MCP server in PolicyLayer and add a rule for register_company: 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 Ap2. Nothing to install.
register_company is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the register_company 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 register_company. 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.
register_company is provided by the Mcp Ap2 MCP server (@codespar/mcp-ap2). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp Ap2, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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