get_current_wal_lsn

A read tool on the Mcpg MCP server.

SERVERMcpg SOURCEpypi:mcpg

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-devopam-mcpg/get-current-wal-lsn.md

WHAT IT DOES

What get_current_wal_lsn does on Mcpg

AI agents call get_current_wal_lsn to retrieve information from Mcpg without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why get_current_wal_lsn is rated Low

WAL LSN is a pointer used to track database transaction log position. Retrieving it has no side effects and provides only diagnostic information. This is a Read operation with low severity since it merely queries system state and cannot alter data or trigger destructive operations.

From the tool's definition Tool name 'get_current_wal_lsn' indicates retrieval of the current Write-Ahead Log (WAL) Log Sequence Number (LSN), a read-only diagnostic metric from PostgreSQL.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs get_current_wal_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 get_current_wal_lsn, this is the rule to start with:

get_current_wal_lsn Allowed

get_current_wal_lsn is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_current_wal_lsn": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about get_current_wal_lsn

What does the get_current_wal_lsn tool do? +

get_current_wal_lsn is a read tool on the Mcpg MCP server. It is categorised as a Read tool in the Mcpg MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_current_wal_lsn? +

Register the Mcpg MCP server in PolicyLayer and add a rule for get_current_wal_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 get_current_wal_lsn? +

get_current_wal_lsn is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_current_wal_lsn? +

Yes. Add a rate_limit block to the get_current_wal_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 get_current_wal_lsn completely? +

Set action: deny in the PolicyLayer policy for get_current_wal_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 get_current_wal_lsn? +

get_current_wal_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.

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