Check for any pending messages from other Claude instances
AI agents call claude_senator_check_messages to retrieve information from Claude Senator without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves the status of existing messages without modifying, deleting, or executing anything. It is a non-destructive query operation that simply reads pending message state. While it enables inter-Claude communication, the specific action here is passive information retrieval, making it a Read-category risk.
From the tool's definition Tool name 'check_messages' and description 'Check for any pending messages from other Claude instances' indicate a retrieval operation with no side effects. The verb 'check' and the passive query of pending messages align with Read operations (list/get/fetch).
Attacks that exploit this kind of access
Check for any pending messages from other Claude instances. It is categorised as a Read tool in the Claude Senator MCP Server, which means it retrieves data without modifying state.
Register the Claude Senator MCP server in PolicyLayer and add a rule for claude_senator_check_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 Claude Senator. Nothing to install.
claude_senator_check_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 claude_senator_check_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 claude_senator_check_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.
claude_senator_check_messages is provided by the Claude Senator MCP server (vvkmnn/claude-senator-mcp). 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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