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Yash-0620

postgres-mcp

by Yash-0620

execute_sql

Destructive

Execute SQL queries on a Postgres database to retrieve, insert, update, or delete data.

Instructions

Execute any SQL query

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
sqlNoSQL to runall

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior3/5

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

Annotations already provide destructiveHint: true, so the destructive nature is known. The description 'Execute any SQL query' aligns with this but adds no additional behavioral insights beyond the annotation. The description does not contradict annotations.

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

Conciseness3/5

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

The description is extremely concise (4 words), which is efficient but borderline under-specified. It lacks structured detail that would aid agent comprehension without sacrificing conciseness.

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 tool has a destructive hint and an output schema, the description should provide more context, such as the types of queries supported (e.g., SELECT, DML) or potential side effects. The current description is too minimal to be complete.

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

Parameters3/5

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

Schema description coverage is 100% with parameter 'sql: SQL to run'. The description adds no new meaning beyond the schema, meeting the baseline for high coverage.

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

Purpose4/5

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

The description states 'Execute any SQL query', clearly indicating the tool runs SQL queries. However, it lacks differentiation from sibling tools like explain_query or list_schemas, which are clearly distinct but could confuse an agent about when to use this tool vs others.

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

Usage Guidelines2/5

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

The description provides no guidance on when or when not to use this tool. It does not mention alternatives or prerequisites, leaving the agent without contextual usage direction.

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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