Add recipients to a suppression group via POST /asm/groups/{group_id}/suppressions. Future mail in this group will be blocked for these addresses.
AI agents use add_suppression 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 creates or modifies suppression list data (a reversible operation). It does not delete data, execute code, move money, or cause direct financial impact. However, blocking mail delivery for recipients could affect business continuity if misapplied. Classified as Write rather than Destructive because the action is reversible (recipients can be removed from the suppression group).
From the tool's definition POST /asm/groups/{group_id}/suppressions. Modifies a suppression list by adding recipients whose future mail will be blocked.
Documented attack patterns abuse exactly the kind of access add_suppression 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 add_suppression:
{
"version": "1",
"default": "deny",
"tools": {
"add_suppression": {
"limits": [
{
"counter": "add_suppression_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}add_suppression 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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Add recipients to a suppression group via POST /asm/groups/{group_id}/suppressions. Future mail in this group will be blocked for these addresses. 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 add_suppression: 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.
add_suppression 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 add_suppression 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 add_suppression. 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.
add_suppression 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.