Get information about indexes on a collection. Returns details about: - Index names and fields - Index types (single field, compound, text, etc.) - Index sizes - Index options - Usage statistics
AI agents call get_indexes 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 performs a metadata retrieval operation with no side effects. It queries index information for analytical purposes only, consistent with the read-only design of the server. The blast radius of misuse is minimal—an AI could only enumerate index details, which does not compromise data confidentiality, integrity, or availability.
From the tool's definition Tool retrieves metadata about indexes: 'Get information about indexes on a collection' with details like 'Index names and fields', 'Index types', 'Index sizes', 'Index options', and 'Usage statistics'.
Documented attack patterns abuse exactly the kind of access get_indexes gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MongoDB MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_indexes:
{
"version": "1",
"default": "deny",
"tools": {
"get_indexes": {}
}
}get_indexes is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get information about indexes on a collection. Returns details about: - Index names and fields - Index types (single field, compound, text, etc.) - Index sizes - Index options - Usage statistics. 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 get_indexes: 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.
get_indexes 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_indexes 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_indexes. 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_indexes is provided by the MongoDB MCP Server MCP server (jonfreeland/mongodb-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from MongoDB MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
5 MongoDB MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.