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vinycoolguy2015

Database Assistant MCP Server

validate_sql

Validates SQL queries to ensure they are read-only and safe, preventing dangerous operations before execution.

Instructions

Check if a SQL query is safe to execute. Validates that it is read-only, single-statement, and contains no dangerous operations. Use before run_sql to preview validation.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
queryYesSQL query to validate

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior3/5

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

No annotations provided, so description carries full burden. It lists validation criteria but does not describe what happens upon success/failure (e.g., returns boolean, throws error) or mention any side effects. Partially transparent but lacks behavioral outcomes.

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

Conciseness5/5

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

Two sentences, front-loaded with purpose, no extraneous words. Every sentence adds value.

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

Completeness4/5

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

Output schema exists, so return values need not be explained. Description covers input and purpose well. Minor gap: could mention output type or error cases, but not critical given the output schema.

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 has 100% coverage with a basic description of the query parameter. The description reinforces it's a SQL query but adds no further semantics like format, examples, or constraints. Baseline 3 is appropriate.

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 the tool checks SQL query safety for read-only, single-statement, and no dangerous operations. Distinguishes itself from the sibling `run_sql` by emphasizing preview validation.

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

Usage Guidelines5/5

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

Explicitly tells the agent to use this before `run_sql` to preview validation, giving clear when-to-use direction. No exclusion criteria needed beyond that.

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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