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mcp-multi-db

describe_table

Get column details for a table in PostgreSQL, MySQL, or SQLite databases. Specify the database, table, and optionally the schema.

Instructions

Describe columns for a table in a configured database.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
database_idYesDatabase id from list_databases
tableYesTable name
schemaNoSchema name (Postgres/MySQL). Ignored for SQLite.
Behavior2/5

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

No annotations are provided, so the description bears full responsibility for behavioral disclosure. It only states 'describe columns' with no mention of side effects, permissions, error handling, or return format, leaving significant gaps for a read-like operation.

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?

The description is a single concise sentence with no wasted words, front-loading the core action and target.

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?

Given the absence of an output schema and low complexity, the description adequately identifies the tool's purpose but lacks details about what the tool returns (e.g., column names, types), which would improve completeness.

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%, so the input schema already documents each parameter with descriptions. The tool description adds no additional meaning beyond the schema, meeting the baseline expectation.

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 action ('describe columns') and the resource ('table in a configured database'), distinguishing it from sibling tools like list_databases (list databases), list_tables (list tables), and run_query (execute arbitrary SQL).

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 usage when column details of a specific table are needed, but provides no explicit guidance on when to prefer this tool over alternatives like run_query, nor any 'when not to use' scenarios.

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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