List all collections for a configured MongoDB alias.
AI agents call db_list_collections to retrieve information from Custom MCP Database Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries metadata about MongoDB collections without creating, modifying, deleting, or executing any operations on data. It is a read-only operation that returns structural information about the database. The severity is low because listing collections exposes database schema information but does not risk data loss or unauthorized data access beyond what the configured alias permits.
From the tool's definition Tool name 'db_list_collections' and description 'List all collections for a configured MongoDB alias' indicate a retrieval operation with no modification of data.
Attacks that exploit this kind of access
List all collections for a configured MongoDB alias. It is categorised as a Read tool in the Custom MCP Database Server MCP Server, which means it retrieves data without modifying state.
Register the Custom MCP Database Server MCP server in PolicyLayer and add a rule for db_list_collections: 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 Custom MCP Database Server. Nothing to install.
db_list_collections 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 db_list_collections 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 db_list_collections. 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.
db_list_collections is provided by the Custom MCP Database Server MCP server (renanlido/custom-mcp-database). 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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