List all entity kinds (types) in the Datastore by querying the __kind__ metadata
AI agents call datastore_listKinds to retrieve information from MCP Datastore Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves metadata about available entity types in Firestore Datastore mode. It performs a read-only query against system metadata (__kind__) with no side effects, no data modification, no code execution, and no destructive action. The blast radius of misuse is minimal—an attacker learns the schema structure but cannot access, modify, or delete actual data. Classified as Read with low severity.
From the tool's definition Tool name 'listKinds' and description state it 'List all entity kinds' by 'querying the __kind__ metadata' — a retrieval operation with no modification or execution of external code.
Attacks that exploit this kind of access
List all entity kinds (types) in the Datastore by querying the __kind__ metadata. It is categorised as a Read tool in the MCP Datastore Server MCP Server, which means it retrieves data without modifying state.
Register the MCP Datastore Server MCP server in PolicyLayer and add a rule for datastore_listKinds: 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 MCP Datastore Server. Nothing to install.
datastore_listKinds 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 datastore_listKinds 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 datastore_listKinds. 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.
datastore_listKinds is provided by the MCP Datastore Server MCP server (petekmet/mcp-gcp-datastore). 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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