Lists all organizations that the user is a member of.
AI agents call list_organizations to retrieve information from PostgREST without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a simple query/list operation to retrieve organizational membership data. It does not create, modify, delete, or execute anything. The blast radius of misuse is minimal — an AI agent could only read the user's organization list, which is already scoped to the authenticated user's own data.
From the tool's definition Tool name is 'list_organizations' and description states it 'Lists all organizations that the user is a member of' — a pure retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access list_organizations gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and PostgREST, and nothing reaches the server without passing your rules. This is the rule we recommend for list_organizations:
{
"version": "1",
"default": "deny",
"tools": {
"list_organizations": {}
}
}list_organizations is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Lists all organizations that the user is a member of. It is categorised as a Read tool in the PostgREST MCP Server, which means it retrieves data without modifying state.
Register the PostgREST MCP server in PolicyLayer and add a rule for list_organizations: 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 PostgREST. Nothing to install.
list_organizations 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_organizations 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_organizations. 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_organizations is provided by the PostgREST MCP server (supabase/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 32 PostgREST tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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32 PostgREST tools catalogued and risk-classified — across an index of 42,500+ MCP servers.