Best Practices for Designing Claude Plugin Descriptions: 8 Essential Guidelines

Design concise, verb-first descriptions of approximately 150 characters that specify the exact domain and include trigger phrases to help Claude reliably recognize when to invoke your plugin.

Designing Claude plugin descriptions requires following a strict schema that prioritizes machine readability over creative flair. The anthropics/claude-plugins-community repository establishes canonical patterns across dozens of skill files, demonstrating how precise front-matter and marketplace JSON entries enable accurate plugin discovery. When you follow the repository's established conventions, you ensure that Claude can parse the description, match it against user intent, and invoke the correct tool without ambiguity.

Location: Centralize Descriptions in Front-Matter or Marketplace JSON

Store the description in the plugin's YAML front-matter (description:) or in the marketplace entry ("description": "...") to give Claude a single source of truth. In the anthropics/claude-plugins-community repository, the central catalog resides in .claude-plugin/marketplace.json, where each plugin entry includes a concise description field.

{
  "name": "my-awesome-plugin",
  "description": "Generate customizable marketing copy with brand-aware tone for Google Ads, Facebook Ads, and LinkedIn posts.",
  "source": {
    "source": "url",
    "url": "https://github.com/you/my-awesome-plugin.git",
    "sha": "YOUR_COMMIT_SHA"
  },
  "homepage": "https://github.com/you/my-awesome-plugin"
}

Length: Keep Descriptions Under 150 Characters

Restrict descriptions to one or two sentences—approximately 150 characters—to maximize parseability. Short sentences align with Claude's trigger-phrase detection algorithms and reduce the cognitive load during intent matching.

As demonstrated in quickdesign/skills/quickdesign/SKILL.md, effective descriptions remain brief:

---
name: quickdesign
description: Use the quickdesign CLI to generate AI media assets from text prompts.
---

If you require extended documentation, split content into separate fields like summary or usage rather than bloating the primary description.

Verb-First Structure: Lead with Action

Start every description with an action verb such as Generate, Import, Analyze, or Create to clarify capability immediately. Verb-first wording aligns with Claude's trigger-phrase detection and improves recall during conversation parsing.

The tres-import-contacts skill in tres-finance-plugin/skills/tres-import-contacts/SKILL.md exemplifies this pattern:

description: Import contacts (address book entries) into TRES Finance from a CSV or XLSX file.

Scope Definition: Specify the Exact Domain

Explicitly state the product or domain the plugin operates within, such as "TRES Finance" or "QuickDesign", to prevent accidental activation for unrelated tasks. Precise scoping reduces hallucinations and ensures Claude delegates requests to the correct specialized tool.

In tres-finance-plugin/skills/tres-upload-tx-header-validation/SKILL.md, the description narrows the scope explicitly:

description: Validate headers for TRES Finance bulk transaction CSV uploads.

Trigger Phrases: Embed Natural Language Patterns

Include a handful of natural-language triggers that map clearly to the plugin's purpose. These concrete patterns give Claude explicit strings to match against user utterances, increasing activation precision.

Expand the description field with trigger phrases when necessary, as shown in the TRES Finance skills:

description: |
  Import contacts (address book entries) into TRES Finance from a CSV or XLSX file.
  Trigger phrases: "import my contacts", "upload address book", "add contacts to TRES".

Exclusion Clauses: Define Boundaries Explicitly

If your plugin covers a narrow sub-task, explicitly mention what it does not handle to avoid over-use when broader plugins exist. Exclusion clauses prevent Claude from invoking specialized tools for general-purpose requests.

The tres-upload-tx-header-validation skill demonstrates this defensive pattern in tres-finance-plugin/skills/tres-upload-tx-header-validation/SKILL.md:

description: |
  Validate headers for TRES Finance bulk transaction CSV uploads.
  Do NOT trigger for contacts import CSV or for general CSV parsing tasks.

Formatting Constraints: Use Plain Text Only

Enter descriptions as plain text without Markdown formatting, emojis, or HTML. The marketplace JSON parser and YAML front-matter processors expect raw strings, and additional markup can interfere with Claude's semantic parsing.

All descriptions in the anthropics/claude-plugins-community repository follow this rule, ensuring consistent indexing across the plugin ecosystem.

Consistency: Maintain Uniform Syntax Across Plugins

Follow the same syntax structure across all plugins: description: "<verb> ... <product> ..." and place the field at the top of the file. Consistent formatting enables automated tooling to extract and index descriptions for the marketplace catalog.

The uniform format appears across dozens of SKILL.md files, including tres-settings-management and testdino-sessions, creating a predictable pattern that both humans and automation can parse reliably.

Summary

• Store descriptions in .claude-plugin/marketplace.json or YAML front-matter to establish a single source of truth.
• Limit length to approximately 150 characters (one or two sentences) for optimal parsing.
• Begin with verbs like Generate, Import, or Analyze to align with trigger-phrase detection.
• Specify domains explicitly (e.g., "TRES Finance") to prevent accidental invocations.
• Include trigger phrases and exclusion clauses to refine activation precision.
• Use plain text only—no Markdown or HTML inside description fields.

Frequently Asked Questions

How long should a Claude plugin description be?

Keep descriptions to approximately 150 characters or one to two sentences. The anthropics/claude-plugins-community repository demonstrates that concise descriptions improve Claude's ability to match user intent against available plugins. If you need to provide additional context, use separate fields like summary or usage rather than extending the primary description.

Should I use Markdown formatting in plugin descriptions?

No, always use plain text without Markdown, HTML, or special characters. The marketplace JSON and YAML front-matter parsers in the repository expect raw strings, and formatting markup can interfere with Claude's semantic analysis. Reserve rich formatting for separate documentation files outside the description field.

How do I prevent Claude from activating the wrong plugin?

Include explicit exclusion clauses stating what the plugin does not handle, and precisely define the scope by naming the specific product or domain. For example, the tres-upload-tx-header-validation skill explicitly states "Do NOT trigger for contacts import CSV" to prevent confusion with other TRES Finance plugins. Additionally, including specific trigger phrases helps Claude distinguish between similar tools.

Where should I store the plugin description?

Store descriptions in either the plugin's YAML front-matter within SKILL.md files or in the central .claude-plugin/marketplace.json catalog. The repository uses both locations: individual skill files contain the canonical description for that specific capability, while the marketplace JSON aggregates descriptions for discovery. Ensure both locations remain synchronized if you maintain both files.

{
  "mcpServers": {
    "instagit": {
      "command": "npx",
      "args": ["-y", "instagit@latest"]
    }
  }
}