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llm-graph

FastPostgresMCP

by llm-graph

schema_tool

Retrieve detailed schema information for any table, including columns, types, and constraints, using the table name.

Instructions

Retrieve detailed schema information for a specific table

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
dbAliasNo
tableNameYes
Behavior2/5

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

No annotations are provided, so the description carries full burden. It only states it retrieves schema info but does not disclose read-only nature, error handling, or authentication requirements.

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 a single sentence, front-loaded with key action, but lacks necessary detail. It is minimally concise at the expense of completeness.

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

Completeness1/5

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

Given no output schema, no annotations, and 2 under-documented parameters, the description is severely incomplete. It does not explain what 'detailed schema information' entails or how to use the optional dbAlias.

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%, yet the description does not explain the parameters (dbAlias, tableName) beyond the bare schema. The description fails to add meaning, e.g., the role of dbAlias or format of tableName.

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 clearly states the verb 'retrieve' and the resource 'detailed schema information for a specific table'. However, it does not differentiate from sibling tools like query_tool, which might also retrieve schema-related data.

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?

No guidance is given on when to use this tool versus alternatives such as execute_tool or query_tool. The description does not mention prerequisites or exclusionary conditions.

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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