sandbox

Visual HTML canvas sandbox for agent-driven UI and live previews

Quality

52%

Does it follow best practices?

Impact

Pending

No eval scenarios have been run

Securityby

Passed

No known issues

Optimize this skill with Tessl

npx tessl skill review --optimize ./src/skills/bundled/sandbox/SKILL.md

Quality

Discovery

32%

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

The description identifies a specific technical domain (HTML canvas sandbox) but relies heavily on jargon and lacks actionable trigger guidance. It fails to explain when Claude should use this skill and doesn't list concrete capabilities beyond vague references to 'UI' and 'live previews'.

Suggestions

Add an explicit 'Use when...' clause with natural trigger terms like 'interactive preview', 'visual demo', 'render UI component', or 'test layout'

Replace 'agent-driven' with user-facing language and list specific actions like 'render interactive components', 'preview HTML layouts', 'create visual prototypes'

Include file type triggers or common user phrases such as 'show me what this looks like', 'visual preview', or 'interactive sandbox'

Dimension	Reasoning	Score
Specificity	Names the domain (HTML canvas sandbox) and hints at actions (UI, live previews), but lacks concrete specific actions like 'create interactive widgets', 'render components', or 'build prototypes'.	2 / 3
Completeness	Describes what it is (a sandbox) but completely lacks a 'Use when...' clause or any explicit trigger guidance for when Claude should select this skill.	1 / 3
Trigger Term Quality	Contains some relevant terms ('HTML', 'canvas', 'sandbox', 'UI', 'live previews') but uses technical jargon like 'agent-driven' that users wouldn't naturally say. Missing common variations like 'preview', 'visual editor', 'interactive demo'.	2 / 3
Distinctiveness Conflict Risk	The combination of 'HTML canvas sandbox' and 'agent-driven' provides some distinctiveness, but 'UI' and 'live previews' are generic enough to potentially overlap with other web development or preview-related skills.	2 / 3
	Total	7 / 12 Passed

Implementation

72%

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

This is a concise, well-structured skill that efficiently documents a sandbox canvas tool. The main weaknesses are the lack of meaningful examples showing real use cases (dashboards, agent-driven UI as mentioned in the description) and missing error handling or validation guidance for the workflow.

Suggestions

Add a more realistic example showing a complete workflow, such as creating a simple dashboard or live preview with expected visual output description

Include error handling guidance: what happens if the server fails to start, or if push fails, and how to recover

Add expected output examples for commands like `/sandbox status` to show what Claude should expect to see

Dimension	Reasoning	Score
Conciseness	The content is lean and efficient, listing only commands, environment variables, and brief examples without explaining what HTML is or how servers work. Every section earns its place.	3 / 3
Actionability	Commands are clearly listed and examples show usage patterns, but the examples are basic and don't show complete workflows or expected outputs. The HTML example is trivial rather than demonstrating real use cases.	2 / 3
Workflow Clarity	The 'How It Works' section provides a sequence but lacks validation checkpoints. No guidance on error handling, what to do if the server fails to start, or how to verify content was pushed successfully.	2 / 3
Progressive Disclosure	For a simple, single-purpose skill under 50 lines, the content is well-organized with clear sections (Commands, Environment Variables, Examples, How It Works). No need for external references given the scope.	3 / 3
	Total	10 / 12 Passed

Validation

90%

Warnings & errors only

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation — 10 / 11 Passed

Validation for skill structure

Criteria	Description	Result
frontmatter_unknown_keys	Unknown frontmatter key(s) found; consider removing or moving to metadata	Warning

	Total	10 / 11 Passed

Repository: alsk1992/CloddsBot
Commit: 2a8c94e

Reviewed: 29 days ago

Table of Contents

Discovery Implementation Validation

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