Gets a single WebSocket message by its frame index. Use get_websocket_messages or analyze_websocket_messages first to find the frame index.
AI agents call get_websocket_message to retrieve information from JS Reverse MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves WebSocket message data without modifying, deleting, or executing anything. It is clearly a Read operation. The medium severity accounts for the fact that WebSocket messages often contain sensitive application state and credentials that could be exploited if an AI agent extracts and misuses them, even though the tool itself performs only observation.
From the tool's definition The tool 'gets a single WebSocket message by its frame index' — a retrieval operation with 'no side effects'. WebSocket traffic inspection is fundamentally a read operation.
Attacks that exploit this kind of access
Gets a single WebSocket message by its frame index. Use get_websocket_messages or analyze_websocket_messages first to find the frame index. It is categorised as a Read tool in the JS Reverse MCP MCP Server, which means it retrieves data without modifying state.
Register the JS Reverse MCP server in PolicyLayer and add a rule for get_websocket_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 JS Reverse MCP. Nothing to install.
get_websocket_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 get_websocket_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 get_websocket_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.
get_websocket_message is provided by the JS Reverse MCP server (noone-hub/jsreverser-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.
Teams ship this data inside their own products. See what a licence covers →