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gabriel-herencia

postgres-mcp

list_indexes

List indexes on a PostgreSQL table with complete CREATE INDEX statements and flags.

Instructions

Indexes on a table, with full CREATE INDEX definitions and flags.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
tableYes
schemaNopublic

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior3/5

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

No annotations provided, so description carries full burden. It discloses that the tool returns CREATE INDEX definitions and flags, which implies a safe read operation. However, it omits any mention of authentication, rate limits, or error conditions, which is minimal but not misleading.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Single sentence, no wasted words, and front-loaded with key information. Could be slightly more structured, but remains concise and efficient.

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?

Output schema exists, so return format is covered. The description adds value by specifying 'full CREATE INDEX definitions and flags'. However, lack of parameter explanation is a gap, making it only moderately complete.

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%; the description does not explain the parameters (table, schema) at all. With low coverage, the description must compensate, but it fails to add any meaning beyond the schema's names and types.

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?

Description clearly states the tool lists indexes on a table with full CREATE INDEX definitions and flags. It uses a specific verb 'list' and specifies the resource 'indexes on a table', distinguishing it from sibling tools like list_constraints and list_tables.

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?

No explicit guidance on when to use this tool versus alternatives. The description implies usage for retrieving index definitions, but lacks when-not-to-use or explicit references to siblings.

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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