Describe one collection with fields, sample values, relationships, gotchas, and working examples. Use this before running queries against a collection you have not explored yet.
AI agents call collection-schema to retrieve information from Askdb 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 a database collection's structure without modifying, deleting, or executing operations on the underlying data. It is purely informational and exploratory in nature, making it a Read category tool with low severity since schema inspection cannot cause harm to data integrity or availability.
From the tool's definition Tool describes a collection schema with fields, sample values, relationships, and examples. The verb 'Describe' and the purpose of gathering schema information before querying indicates a read-only retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access collection-schema gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Askdb, and nothing reaches the server without passing your rules. This is the rule we recommend for collection-schema:
{
"version": "1",
"default": "deny",
"tools": {
"collection-schema": {}
}
}collection-schema is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Describe one collection with fields, sample values, relationships, gotchas, and working examples. Use this before running queries against a collection you have not explored yet. It is categorised as a Read tool in the Askdb MCP Server, which means it retrieves data without modifying state.
Register the Askdb MCP server in PolicyLayer and add a rule for collection-schema: 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 Askdb. Nothing to install.
collection-schema 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-schema 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-schema. 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-schema is provided by the Askdb MCP server (mgorabbani/askdb). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Askdb, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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10 Askdb tools catalogued and risk-classified — across an index of 43,000+ MCP servers.