wait_for_lsn

A execute tool on the Mcpg MCP server.

SERVERMcpg SOURCEpypi:mcpg

High RISK CLASS

Category Execute

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-devopam-mcpg/wait-for-lsn.md

WHAT IT DOES

What wait_for_lsn does on Mcpg

AI agents invoke wait_for_lsn to trigger actions in Mcpg. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

RISK

Why wait_for_lsn is rated High

LSN operations in PostgreSQL control replication synchronization and can affect database availability and transaction ordering. While not destructive or financial, executing such a tool could halt queries, affect failover behavior, or impact application performance depending on arguments. The empty description reduces confidence but the operational nature of LSN management justifies Execute category.

From the tool's definition Tool name 'wait_for_lsn' (Log Sequence Number) indicates it triggers a PostgreSQL operation that blocks or monitors replication state.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs wait_for_lsn safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Mcpg, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For wait_for_lsn, this is the rule to start with:

wait_for_lsn Rate-limited

wait_for_lsn stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "wait_for_lsn": {
      "limits": [
        {
          "counter": "wait_for_lsn_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Mcpg, apply this rule, and every wait_for_lsn call is checked against it from then on.

FAQ

Questions about wait_for_lsn

What does the wait_for_lsn tool do? +

wait_for_lsn is a execute tool on the Mcpg MCP server. It is categorised as a Execute tool in the Mcpg MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on wait_for_lsn? +

Register the Mcpg MCP server in PolicyLayer and add a rule for wait_for_lsn: 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 Mcpg. Nothing to install.

What risk level is wait_for_lsn? +

wait_for_lsn is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit wait_for_lsn? +

Yes. Add a rate_limit block to the wait_for_lsn 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.

How do I block wait_for_lsn completely? +

Set action: deny in the PolicyLayer policy for wait_for_lsn. 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.

What MCP server provides wait_for_lsn? +

wait_for_lsn is provided by the Mcpg MCP server (pypi:mcpg). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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