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Superhero

by io.github.pipeworx-io
OverviewDiscussionsAdmin

List All

list_all
Read-onlyIdempotent

List all superheroes in the database with their IDs, names, and slugs.

Input Schema

NameRequiredDescriptionDefault

No arguments

Output Schema

NameRequiredDescriptionDefault
countYesTotal number of superheroes in the database
heroesYesArray of superhero summaries

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
+  "properties": {
+    "count": {
+      "description": "Total number of superheroes in the database",
+      "type": "number"
+    },
+    "heroes": {
+      "description": "Array of superhero summaries",
+      "items": {
+        "properties": {
+          "id": {
+            "description": "Numeric superhero ID",
+            "type": "number"
+          },
+          "name": {
+            "description": "Superhero name",
+            "type": "string"
+          },
+          "slug": {
+            "description": "URL-friendly slug identifier",
+            "type": "string"
+          }
+        },
+        "required": [
+          "id",
+          "name",
+          "slug"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    }
+  },
+  "required": [
+    "count",
+    "heroes"
+  ],
+  "type": "object"
+}
  2. Changed1 schema field changed
    • addedInput schema / examples
      Added value: +[
+  {}
+]
  3. First observed

TDQS

A4.1/5.0
Behavior3/5

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

Annotations already declare the tool read-only, open-world, idempotent, and non-destructive, covering the safety profile. The description adds that it returns all superheroes and specific fields, but does not disclose behavioral traits like pagination, sorting, or potential data volume. No contradiction with annotations.

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, front-loaded sentence that succinctly states the action, scope, and returned fields without any redundancy or filler words.

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?

For a tool with no parameters, strong safety annotations, and an existing output schema, the description fully captures the tool's purpose and expected return content. Nothing critical is missing for an agent to invoke it correctly.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The input schema has zero parameters, so there is no parameter detail to add. Per the rubric, 0 params earns a baseline of 4; the description is not required to compensate for missing schema information.

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 uses the specific verb 'List' and clearly states the resource ('all superheroes in the database') and the returned fields (IDs, names, slugs). The scope of 'all' distinguishes it from siblings like get_hero, which retrieves a single hero.

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 the tool is used for retrieving a complete list of superheroes, but it does not explicitly state when to use it over alternatives such as get_hero or search_within, nor does it mention any exclusions or prerequisites.

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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