Send a carta de correção eletrônica (CCe) for a NF-e. Used to correct minor errors without cancelling.
AI agents use send_correction_letter_nfe 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 is a Write operation because it creates and transmits a correction document that modifies the state of an existing fiscal record. While it does not delete or irreversibly destroy data (thus not Destructive), it does create a new legal/fiscal artifact that changes the official record.
From the tool's definition The tool 'send_correction_letter_nfe' sends a 'carta de correção eletrônica' (electronic correction letter) for a NF-e (Brazilian fiscal document), which modifies existing financial/fiscal records by correcting errors without cancellation.
Documented attack patterns abuse exactly the kind of access send_correction_letter_nfe 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 send_correction_letter_nfe:
{
"version": "1",
"default": "deny",
"tools": {
"send_correction_letter_nfe": {
"limits": [
{
"counter": "send_correction_letter_nfe_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}send_correction_letter_nfe 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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Send a carta de correção eletrônica (CCe) for a NF-e. Used to correct minor errors without cancelling. 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 send_correction_letter_nfe: 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.
send_correction_letter_nfe 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 send_correction_letter_nfe 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 send_correction_letter_nfe. 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.
send_correction_letter_nfe 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.
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