AI agents call list_suppressions to retrieve information from Astrograph without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns a list of suppressed hashes—a read-only operation that retrieves state without modifying, deleting, or executing anything. The action is informational only. Severity is low because the data returned is metadata about suppression rules, not sensitive user data or system state that could cause harm if exposed to a malicious AI agent.
From the tool's definition Tool name 'list_suppressions' and description 'List suppressed hashes' indicate a retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access list_suppressions gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Astrograph, and nothing reaches the server without passing your rules. This is the rule we recommend for list_suppressions:
{
"version": "1",
"default": "deny",
"tools": {
"list_suppressions": {}
}
}list_suppressions is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List suppressed hashes. It is categorised as a Read tool in the Astrograph MCP Server, which means it retrieves data without modifying state.
Register the Astrograph MCP server in PolicyLayer and add a rule for list_suppressions: 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 Astrograph. Nothing to install.
list_suppressions is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list_suppressions 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 list_suppressions. 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.
list_suppressions is provided by the Astrograph MCP server (thaylo/astrograph). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Astrograph, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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12 Astrograph tools catalogued and risk-classified — across an index of 43,000+ MCP servers.