AI agents call receive_message to retrieve information from Gptqueue without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Receiving a message is a read operation that fetches data from the queue. While it may consume/pop the message from the queue (making it non-idempotent), it does not create, modify, delete, or trigger external side effects. The blast radius is low since an agent misusing this tool would at most drain its own message queue.
From the tool's definition "Receive the next message from this agent" — retrieves/dequeues the next queued message, a read/fetch operation
Attacks that exploit this kind of access
Receive the next message from this agent. It is categorised as a Read tool in the Gptqueue MCP Server, which means it retrieves data without modifying state.
Register the Gptqueue MCP server in PolicyLayer and add a rule for receive_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 Gptqueue. Nothing to install.
receive_message 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 receive_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 receive_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.
receive_message is provided by the Gptqueue MCP server (rahulrajaram/gptqueue). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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