List all top-level collections in Firestore
AI agents call list_collections to retrieve information from Firestore MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns metadata about Firestore collections without creating, modifying, or deleting any data. It is a straightforward read operation that retrieves information about the database structure. The severity is low because listing collections exposes schema information but does not directly compromise sensitive data or enable destructive actions without additional tools.
From the tool's definition Tool name 'list_collections' and description 'List all top-level collections in Firestore' indicate a retrieval operation with no side effects.
Attacks that exploit this kind of access
List all top-level collections in Firestore. It is categorised as a Read tool in the Firestore MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Firestore MCP Server MCP server in PolicyLayer and add a rule for 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 Firestore MCP Server. Nothing to install.
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 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 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.
list_collections is provided by the Firestore MCP Server MCP server (yudai-uk/firestore-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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