Look up a single user document by its string id.
AI agents call by_id to retrieve information from Mdb Mcp Gateway without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a straightforward document lookup operation. It retrieves data by identifier without side effects, reversible modifications, code execution, or irreversible changes. The operation is read-only and returns a single document, making it the least privileged category. Severity is low because misuse would only expose existing data rather than cause operational damage or financial impact.
From the tool's definition Tool name 'by_id' and description 'Look up a single user document by its string id' indicate a retrieval operation with no modification, deletion, or execution.
Attacks that exploit this kind of access
Look up a single user document by its string id. It is categorised as a Read tool in the Mdb Mcp Gateway MCP Server, which means it retrieves data without modifying state.
Register the Mdb Mcp Gateway MCP server in PolicyLayer and add a rule for by_id: 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 Mdb Mcp Gateway. Nothing to install.
by_id 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 by_id 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 by_id. 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.
by_id is provided by the Mdb Mcp Gateway MCP server (ranfysvalle02/m-gate). 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 →