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chenz4027

postgres-mcp

by chenz4027

postgres_insert

Insert a new row into a specified PostgreSQL table. Supply the table name and column-value pairs to create the record.

Instructions

Insert a new record into a table

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
dataYesObject containing column names and values to insert
table_nameYesName of the table to insert into
Behavior2/5

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

No annotations are provided, so the description must carry the transparency burden. It only states the insert action without disclosing return values, validation behavior, error handling, or side effects beyond the obvious write 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 redundancy. It is front-loaded with the action verb, making it easily scannable.

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?

While the tool is simple, the description lacks context about return values, constraints, or interaction with nested data. Given that there is no output schema and no annotations, the description is too sparse to fully prepare an agent for invocation.

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?

The input schema fully documents both parameters (table_name and data) with clear descriptions, so the description adds no additional semantic value. Baseline of 3 is appropriate given 100% schema coverage.

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's function with a specific verb ('Insert') and resource ('a new record into a table'), distinguishing it from sibling tools like update, delete, and select.

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?

There is no guidance on when to use this tool versus alternatives such as postgres_update or postgres_query. The description does not mention any exclusions or preferred contexts.

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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