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@yawlabs/postgres-mcp

by YawLabs
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TypeScript
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List views with definitions

pg_list_views
Read-onlyIdempotent

List views and materialized views in any schema with their SQL definitions, making view body inspection straightforward when names alone are insufficient.

Instructions

List views and materialized views in a schema with their SQL definitions. Use this over pg_list_tables with includeViews: true when you want the view body, not just names.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
schemaNoSchema name (defaults to 'public').public
includeMaterializedNoIf true, include materialized views.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
rowsYes

Schema Changelog

Changes observed during successful MCP inspections. Dates show when Glama detected each change.

  1. Changed2 schema fields changedv0.12.0
    • changedInput schema / $schema
      Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "additionalProperties": false,
+  "properties": {
+    "rows": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "definition": {
+            "description": "Reconstructed view body from pg_get_viewdef.",
+            "type": "string"
+          },
+          "name": {
+            "type": "string"
+          },
+          "type": {
+            "enum": [
+              "view",
+              "materialized_view"
+            ],
+            "type": "string"
+          }
+        },
+        "required": [
+          "name",
+          "type",
+          "definition"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    }
+  },
+  "required": [
+    "rows"
+  ],
+  "type": "object"
+}
  2. First observedv0.7.0

TDQS

A4.3/5.0
Behavior3/5

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

Annotations already declare readOnlyHint, openWorldHint, idempotentHint, and destructiveHint=false, covering the safety profile. The description adds useful context about returning SQL definitions and covering materialized views, but does not deeply describe output behavior; the output schema exists to fill that gap.

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?

Two sentences with no filler. The core functionality is stated first, followed by a precise differentiation from a sibling tool.

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

Completeness5/5

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

The tool is simple, has only two optional parameters fully described in the schema, carries read-only annotations, and has an output schema. The description supplies the missing usage context, so nothing an agent needs to call it correctly is absent.

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 schema already documents both parameters. The description adds no new meaning beyond associating views with a schema and mentioning materialized views, which aligns with the existing parameter descriptions.

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 states a specific verb ('List') and resource ('views and materialized views in a schema'), and clarifies that SQL definitions are included. It also distinguishes itself from the sibling `pg_list_tables` with `includeViews: true`, making its purpose unambiguous.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description explicitly tells the agent when to prefer this tool over `pg_list_tables` with `includeViews: true`: when the view body is needed, not just names. This provides clear selection logic among sibling tools.

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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