Retrieve pending messages from your queue. Returns all messages not yet deleted, ordered oldest-first. Messages are NOT auto-deleted on poll — call delete_message after processing.
Risk signalsBulk/mass operation — affects multiple targets
Part of the CrabbitMQ server.
Free to start. No card required.
AI agents call poll_messages to retrieve information from CrabbitMQ without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though poll_messages only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"poll_messages": {}
}
}See the full CrabbitMQ policy for all 5 tools.
These attack patterns abuse exactly the kind of access poll_messages gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Retrieve pending messages from your queue. Returns all messages not yet deleted, ordered oldest-first. Messages are NOT auto-deleted on poll — call delete_message after processing.. It is categorised as a Read tool in the CrabbitMQ MCP Server, which means it retrieves data without modifying state.
Register the CrabbitMQ MCP server in PolicyLayer and add a rule for poll_messages: 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 CrabbitMQ. Nothing to install.
poll_messages 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 poll_messages 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 poll_messages. 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.
poll_messages is provided by the CrabbitMQ MCP server (crabbitmq/crabbit-mq). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 5 CrabbitMQ tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.