Read a single document by its ObjectId.
AI agents call read_document_by_id to retrieve information from MongoDB MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves data from a MongoDB database without modifying, deleting, or executing operations. It is a straightforward read operation that queries and returns a document, fitting the 'Read' category. Severity is low because read operations alone have no destructive or harmful side effects, though access controls should still be considered for sensitive data exposure.
From the tool's definition Tool name 'read_document_by_id' and description 'Read a single document by its ObjectId' indicate a retrieval operation with no side effects.
Attacks that exploit this kind of access
Read a single document by its ObjectId. It is categorised as a Read tool in the MongoDB MCP Server MCP Server, which means it retrieves data without modifying state.
Register the MongoDB MCP Server MCP server in PolicyLayer and add a rule for read_document_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 MongoDB MCP Server. Nothing to install.
read_document_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 read_document_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 read_document_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.
read_document_by_id is provided by the MongoDB MCP Server MCP server (ruslankf777/mcp_mongo). 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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