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yugui923

db-connect-mcp

by yugui923

execute_query

Execute read-only SQL queries (SELECT, WITH, EXPLAIN) across PostgreSQL, MySQL, and ClickHouse for safe exploratory data analysis.

Instructions

Execute a read-only SQL query (SELECT, WITH, EXPLAIN)

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
queryYesSQL query to execute
limitNoMaximum number of rows to return (default: 1000)
Behavior3/5

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

No annotations provided, so description carries full burden. It correctly identifies the tool as read-only, which is a key behavioral trait. However, it omits details like error handling, return format, timeout limits, or behavior when limit is exceeded.

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?

Single sentence that front-loads the action and resource. No wasted words, efficient and clear.

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?

For a simple tool with no output schema and no annotations, the description is minimally adequate. It covers the read-only constraint but lacks details on return format, error conditions, or integration with sibling tools.

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 coverage is 100% (both 'query' and 'limit' have descriptions). The tool description adds no additional parameter-specific meaning, so 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?

The description clearly states the tool executes read-only SQL queries, listing specific SQL types (SELECT, WITH, EXPLAIN). It differentiates from sibling tools like 'explain_query' and 'sample_data' by specifying the scope of operation.

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?

The description implies read-only usage but does not explicitly exclude write operations or compare to sibling tools like 'explain_query' (which likely returns execution plans). No guidance on when to choose this over alternatives.

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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