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RachelHuangZW

postgres-mcp

execute_query

Execute a SQL query against a PostgreSQL database and receive results as JSON.

Instructions

Execute a SQL query against the connected PostgreSQL database and return results as JSON.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
sqlYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior2/5

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

No annotations exist, so the description must disclose behavioral traits. It mentions JSON output but fails to indicate whether the query can modify data (read-only vs write), what side effects occur, or any authorization requirements. This is insufficient for a potentially destructive operation.

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?

The description is concise (one sentence) and front-loaded with the core action. However, it lacks structure (e.g., no sections or warnings) and could be slightly more informative without losing brevity.

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

Completeness2/5

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

Given the presence of an output schema and the potential risks of SQL execution, the description is incomplete. It does not clarify read-only status, transaction behavior, error handling, or limitations. A more thorough description is needed for safe and correct agent use.

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

Parameters2/5

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

Schema description coverage is 0%, yet the description adds no meaning beyond the parameter name and type. There is no guidance on SQL format, statement constraints, or parameterization, leaving the agent to infer from the name alone.

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?

The description clearly states the tool executes a SQL query against a PostgreSQL database and returns JSON results. It uses specific verbs and resources, and the sibling tools (explain_query, get_table_schema) suggest distinct purposes.

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

Usage Guidelines3/5

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

No explicit when-to-use or when-not-to-use guidance is provided. The description implies usage for executing SQL queries, but does not contrast with siblings like explain_query or get_table_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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