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postgres-explorer

postgres-explorer

by mathewsls
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Remote

execute_query

Run SQL SELECT queries on PostgreSQL to retrieve data safely without modifying the database.

Instructions

Ejecuta una consulta SQL SELECT en PostgreSQL y devuelve los resultados. Úsala solo para consultas de lectura.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "sql": "<sql>"
    },
    "name": "execute_query"
  }
}

Input Schema

NameRequiredDescriptionDefault
sqlYes

Output Schema

NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

B3.3/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations provided, yet description only mentions it's for SELECT and returns results no details on errors, permissions, row limits, or what happens on write attempts. Incomplete for a critical tool.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two concise sentences front-load the purpose. Could be slightly improved by structuring parameter details.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given only one parameter and an output schema, the description is missing parameter semantics and behavioral details, which are needed for safe usage.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters1/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0% and description adds no explanation for the sql parameter, leaving it completely undefined.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Clearly states it executes a SQL SELECT query on PostgreSQL and returns results. Differentiates from sibling tool get_schema.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly says 'use only for read queries', providing context on when to use it. No explicit alternatives mentioned but sibling is get_schema.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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