AI agents call replication_monitor to retrieve information from Postgres Mcp Legacy without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and reports on the state of PostgreSQL replication without creating, modifying, deleting, or executing any operations. Monitoring replication lag and status is a diagnostic read operation with no side effects or ability to alter data or system state.
From the tool's definition Tool name 'replication_monitor' and description 'Monitor replication status and lag' indicate data retrieval and observation only. The word 'monitor' and 'status' suggest read-only querying of replication metrics without modification or execution of commands.
Documented attack patterns abuse exactly the kind of access replication_monitor gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Postgres Mcp Legacy, and nothing reaches the server without passing your rules. This is the rule we recommend for replication_monitor:
{
"version": "1",
"default": "deny",
"tools": {
"replication_monitor": {}
}
}replication_monitor is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Monitor replication status and lag. It is categorised as a Read tool in the Postgres Mcp Legacy MCP Server, which means it retrieves data without modifying state.
Register the Postgres Mcp Legacy MCP server in PolicyLayer and add a rule for replication_monitor: 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 Mcp Legacy. Nothing to install.
replication_monitor 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 replication_monitor 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 replication_monitor. 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.
replication_monitor is provided by the Postgres Mcp Legacy MCP server (neverinfamous/postgres-mcp-legacy). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Postgres Mcp Legacy, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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60 Postgres Mcp Legacy tools catalogued and risk-classified — across an index of 43,000+ MCP servers.