This record as markdown: /tools/441126098-mongo-mcp/mcp-count-documents.md
What mcp_count_documents does on Mongo-MCP
AI agents call mcp_count_documents to retrieve information from Mongo-MCP without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why mcp_count_documents is rated Low
Document counting is a read-only query operation that retrieves aggregate information without side effects. It does not create, modify, delete, or execute arbitrary code. The absence of a description lowers confidence slightly, but the tool name and the sibling tool context (which includes clearly destructive tools like mcp_delete_document and mcp_drop_database) confirm this is a benign retrieval operation.
From the tool's definition Tool name 'mcp_count_documents' indicates a counting/query operation on documents. No description provided, but the name and context (CRUD operations suite for MongoDB) strongly suggest this retrieves document count without modifying data.
Attacks that exploit this kind of access
The rule that runs mcp_count_documents safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Mongo-MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For mcp_count_documents, this is the rule to start with:
mcp_count_documents is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Mongo-MCP, apply this rule, and every mcp_count_documents call is checked against it from then on.
Questions about mcp_count_documents
mcp_count_documents is a read tool on the Mongo MCP server. It is categorised as a Read tool in the Mongo-MCP MCP Server, which means it retrieves data without modifying state.
Register the Mongo MCP server in PolicyLayer and add a rule for mcp_count_documents: 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 Mongo-MCP. Nothing to install.
mcp_count_documents 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 mcp_count_documents 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 mcp_count_documents. 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.
mcp_count_documents is provided by the Mongo MCP server (441126098/mongo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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