Detect locking waits specifically on indexes.
AI agents call PostgreSQL_detect_index_lock_waits to retrieve information from Postgres without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries PostgreSQL's internal locking information to identify wait conditions on indexes. It has no side effects on data or system state—it only reads and reports diagnostic information. While lock monitoring could theoretically inform decisions about problematic queries, the tool itself performs passive observation.
From the tool's definition The tool is named 'detect_index_lock_waits' and described as detecting 'locking waits specifically on indexes.' The verb 'detect' indicates observation and monitoring of existing database state, not modification, execution of arbitrary operations, or deletion.
Documented attack patterns abuse exactly the kind of access PostgreSQL_detect_index_lock_waits gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Postgres, and nothing reaches the server without passing your rules. This is the rule we recommend for PostgreSQL_detect_index_lock_waits:
{
"version": "1",
"default": "deny",
"tools": {
"PostgreSQL_detect_index_lock_waits": {}
}
}PostgreSQL_detect_index_lock_waits is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Detect locking waits specifically on indexes. It is categorised as a Read tool in the Postgres MCP Server, which means it retrieves data without modifying state.
Register the Postgres MCP server in PolicyLayer and add a rule for PostgreSQL_detect_index_lock_waits: 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 Postgres. Nothing to install.
PostgreSQL_detect_index_lock_waits 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 PostgreSQL_detect_index_lock_waits 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 PostgreSQL_detect_index_lock_waits. 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.
PostgreSQL_detect_index_lock_waits is provided by the Postgres MCP server (mukul975/postgres-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Postgres, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
239 Postgres tools catalogued and risk-classified — across an index of 43,000+ MCP servers.