mcp_distinct_values

A read tool on the Mongo- MCP server.

SERVERMongo-MCP SOURCE441126098/mongo-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/441126098-mongo-mcp/mcp-distinct-values.md

WHAT IT DOES

What mcp_distinct_values does on Mongo-MCP

AI agents call mcp_distinct_values 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.

RISK

Why mcp_distinct_values is rated Low

The 'distinct' operation in MongoDB retrieves unique values from a field without modifying data. Despite the empty description lowering confidence slightly, the name and server context clearly indicate a read operation with no side effects. No data is created, modified, deleted, or destroyed. This is a low-severity data retrieval tool.

From the tool's definition Tool name 'mcp_distinct_values' indicates a query operation that retrieves distinct values from a MongoDB collection.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs mcp_distinct_values 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_distinct_values, this is the rule to start with:

mcp_distinct_values Allowed

mcp_distinct_values is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "mcp_distinct_values": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Mongo-MCP, apply this rule, and every mcp_distinct_values call is checked against it from then on.

FAQ

Questions about mcp_distinct_values

What does the mcp_distinct_values tool do? +

mcp_distinct_values 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.

How do I enforce a policy on mcp_distinct_values? +

Register the Mongo MCP server in PolicyLayer and add a rule for mcp_distinct_values: 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.

What risk level is mcp_distinct_values? +

mcp_distinct_values is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit mcp_distinct_values? +

Yes. Add a rate_limit block to the mcp_distinct_values 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.

How do I block mcp_distinct_values completely? +

Set action: deny in the PolicyLayer policy for mcp_distinct_values. 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.

What MCP server provides mcp_distinct_values? +

mcp_distinct_values 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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