Upload or update an A1 digital certificate (.pfx, base64) for an empresa. Required to emit fiscal documents.
AI agents use upload_certificate 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.
This tool modifies sensitive security credentials (digital certificates) that are essential for fiscal/legal document generation. While not irreversibly destructive and not directly moving money, a compromised certificate could enable unauthorized fiscal document emission, impersonation, or fraud.
From the tool's definition Tool enables uploading/updating digital certificates (.pfx) required for fiscal documents. The description explicitly states 'Upload or update' indicating reversible modification of critical authentication credentials.
Documented attack patterns abuse exactly the kind of access upload_certificate 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 upload_certificate:
{
"version": "1",
"default": "deny",
"tools": {
"upload_certificate": {
"limits": [
{
"counter": "upload_certificate_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}upload_certificate 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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Upload or update an A1 digital certificate (.pfx, base64) for an empresa. Required to emit fiscal documents. 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 upload_certificate: 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.
upload_certificate 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 upload_certificate 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 upload_certificate. 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.
upload_certificate 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.
Free to start. No card required.
1300 Mcp Ap2 tools catalogued and risk-classified — across an index of 43,000+ MCP servers.