Describe the indexes for a collection.
AI agents call collection_indexes to retrieve information from Legacy Mongodb without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves index metadata without side effects. It is a read-only query operation consistent with the server's stated read-only access model. Index information is non-sensitive metadata that does not require modification and poses minimal risk if exposed to an AI agent.
From the tool's definition Tool name 'collection_indexes' and description 'Describe the indexes for a collection' indicate a query operation that retrieves metadata about database indexes.
Attacks that exploit this kind of access
Describe the indexes for a collection. It is categorised as a Read tool in the Legacy Mongodb MCP Server, which means it retrieves data without modifying state.
Register the Legacy Mongodb MCP server in PolicyLayer and add a rule for collection_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 Legacy Mongodb. Nothing to install.
collection_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 collection_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 collection_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.
collection_indexes is provided by the Legacy Mongodb MCP server (webxspark/legacy-mongodb-mcp). 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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