listLanguages

Return procedural languages installed in the current database (e.g. plpgsql, plpython3u) with owner, trusted/procedural flags, handler function, and description.

read-onlyany connectionsweeps instancesweeps group

Synopsis

listLanguages()

Description

Return procedural languages installed in the current database (e.g. plpgsql, plpython3u) with owner, trusted/procedural flags, handler function, and description.

Parameters

None of its own.

Also accepts connection, instance, group, described once under arguments every tool takes.

Output

Keyed by language name; each value is its handler, trust and ownership. An absent extension or a missing grant is reported as {error, hint} in place of the map.

Scope

A physical replica is byte-identical here, so asking each member of a replication group adds nothing.

Example mocked data

Request

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "listLanguages",
    "arguments": {}
  }
}

Result

{
  "plpgsql": {
    "owner": "postgres",
    "trusted": true,
    "procedural": true,
    "handler": "plpgsql_call_handler",
    "description": "PL/pgSQL procedural language"
  }
}

Invented values on a fictional shop database, shaped by and checked against this tool's output schema. Real output is returned as structuredContent to clients that negotiate MCP 2025-06-18 or later.