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Yash-0620

postgres-mcp

by Yash-0620

list_objects

Read-only

Retrieve a list of database objects (tables, views, sequences, extensions) within a specified PostgreSQL schema.

Instructions

List objects in a schema

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
object_typeNoObject type: 'table', 'view', 'sequence', or 'extension'table
schema_nameYesSchema name

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior3/5

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

Annotations already provide 'readOnlyHint: true', and the description aligns with that (listing is read-only). The description adds no further behavioral context beyond the annotation, but doesn't contradict it.

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, no unnecessary words. Front-loaded with verb and resource.

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?

Given the presence of an output schema (implied by context) and full parameter documentation, the description is adequate for a simple list operation. It covers the essential purpose.

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 description coverage is 100%, so the input schema fully documents both parameters. The description adds no additional meaning beyond what the schema provides.

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 action ('List') and resource ('objects') within a schema, which distinguishes it from siblings like 'list_schemas'. It could be more specific about object types, but it's sufficient.

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 on when to use this tool versus alternatives like 'get_object_details' or 'list_schemas'. The description only states what it does without context or exclusions.

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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