Send one or more contact cards (vCard-like). Each contact includes name and at least one of phones, emails, addresses, urls, or org.
AI agents use send_contacts_message 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.
The tool creates and sends contact card data (vCard-like), which is a reversible write operation. There are no indicators of financial commitment, code execution, or data destruction. The blast radius of misuse is limited to unwanted contact messages being sent, which is low-severity.
From the tool's definition Tool is described as 'Send one or more contact cards' — a write operation that creates or transmits data. The server context (AP2 — Google's Agent-to-Agent Payment Protocol) and sibling tools (accept_dispute, activate_subscription, add_cart, etc.) suggest…
Documented attack patterns abuse exactly the kind of access send_contacts_message 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_contacts_message:
{
"version": "1",
"default": "deny",
"tools": {
"send_contacts_message": {
"limits": [
{
"counter": "send_contacts_message_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}send_contacts_message 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.
Free to start. No card required.
Send one or more contact cards (vCard-like). Each contact includes name and at least one of phones, emails, addresses, urls, or org. 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_contacts_message: 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_contacts_message 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_contacts_message 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_contacts_message. 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_contacts_message 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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