Charts by Szum

List themes

list_themes

Read-only

Use this when choosing a visual theme for a chart. Returns every available theme and guidance on where each works best.

Input Schema

TableJSON Schema

Name	Required	Description	Default
No arguments

Output Schema

TableJSON Schema

Name	Required	Description	Default
`themes`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedJul 21, 2026
- addedOutput schema / properties / themes / items / properties / name / enum
```
Added value: +[
+  "editorial",
+  "clean",
+  "noir",
+  "loud",
+  "soft",
+  "technical"
+]
```

Changed1 schema field changedJul 11, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": false,
+  "properties": {
+    "themes": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "description": {
+            "type": "string"
+          },
+          "name": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "name",
+          "description"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    }
+  },
+  "required": [
+    "themes"
+  ],
+  "type": "object"
+}

First observedMay 30, 2026

TDQS

A4.5/5.0

Behavior4/5

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

Annotations declare readOnlyHint: true and destructiveHint: false. Description adds that it returns every theme and guidance, consistent with read-only behavior. No contradictions.

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 concise sentences, front-loaded with usage context. Every word adds value; no redundancy.

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?

Simple tool with no parameters and output schema present. Description covers purpose and return value sufficiently given the complexity.

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?

No parameters exist; schema coverage is 100%. Description adds no parameter details but isn't needed. Baseline 4 applies as description helps understand the tool's output.

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 themes for charts and provides guidance. It distinguishes itself from siblings like list_charts and list_marks by specifying the resource (themes) and context (for a chart).

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

Usage Guidelines4/5

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

Explicitly says 'Use this when choosing a visual theme for a chart,' giving a clear when-to-use. No alternatives mentioned, but no sibling tool overlaps with this purpose.

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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