Get a list of available tool categories to help narrow down which tools you need
AI agents call discover_tool_categories to retrieve information from Supabase 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 available tool categories. It performs no modifications, deletions, code execution, or financial operations. It is a simple informational lookup that helps users understand the system structure. The blast radius of misuse is minimal since it only exposes system metadata.
From the tool's definition Tool name 'discover_tool_categories' and description 'Get a list of available tool categories' indicate a retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access discover_tool_categories gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Supabase MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for discover_tool_categories:
{
"version": "1",
"default": "deny",
"tools": {
"discover_tool_categories": {}
}
}discover_tool_categories is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get a list of available tool categories to help narrow down which tools you need. It is categorised as a Read tool in the Supabase MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Supabase MCP Server MCP server in PolicyLayer and add a rule for discover_tool_categories: 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 Supabase MCP Server. Nothing to install.
discover_tool_categories 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 discover_tool_categories 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 discover_tool_categories. 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.
discover_tool_categories is provided by the Supabase MCP Server MCP server (quegenx/supabase-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Supabase MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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4 Supabase MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.