mcp

MCP Apps integration for json-render. Use when building MCP servers that render interactive UIs in Claude, ChatGPT, Cursor, or VS Code, or when integrating json-render with the Model Context Protocol.

Quality

85%

Does it follow best practices?

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Securityby

Passed

No findings from the security scan

Quality

Content

80%

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

This is a clean, highly actionable reference guide with concise, executable code throughout and no wasted tokens. The weaker dimensions are workflow clarity (no explicit validation checkpoints in the build/run flow) and progressive disclosure (a monolithic file where the API reference could be split out).

Suggestions

Add explicit validation checkpoints to the build/run flow — e.g., after bundling the iframe HTML, verify the dist/index.html loads and the StdioServerTransport connect succeeds before proceeding.

Consider moving the Server API and Client API method lists into a separate REFERENCE.md so SKILL.md stays a lean overview that points one level deep to the full API surface.

Dimension	Reasoning	Score
Conciseness	The body is lean and code-driven with no padding — it never explains what MCP, iframes, or React are, assumes Claude's competence, and every section (Quick Start, Architecture, API lists, configs) earns its place.	3 / 3
Actionability	Provides complete, copy-paste-ready code: a full createMcpApp server example, a React client hook, vite.config.ts, Cursor and Claude Desktop client config JSON, and install commands — all executable as written.	3 / 3
Workflow Clarity	The build/run sequence (write server, bundle iframe HTML, configure client, run) is implied through section ordering and a 4-point Architecture list, but there are no explicit validation or verification checkpoints (e.g., confirming the server connected or the bundled HTML loads).	2 / 3
Progressive Disclosure	Content is well-sectioned (Quick Start, Server/Client API, Building iframe HTML, Client Configuration, Dependencies) but everything is inline in a ~115-line monolithic file with no external reference files; the Server/Client API listings are the kind of material that could live in a separate REFERENCE.md.	2 / 3
	Total	10 / 12 Passed

Description

90%

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 is strong: it uses third-person voice, has an explicit "Use when..." trigger clause covering multiple clients, and carves out a distinct niche. The only mild weakness is specificity, where the actions are somewhat abstract ("integration", "building") rather than enumerated concrete operations.

Dimension	Reasoning	Score
Specificity	Names the domain ("MCP Apps integration for json-render") and some actions ("building MCP servers that render interactive UIs", "integrating json-render with the Model Context Protocol"), but the verbs are fairly abstract ("integration", "building") rather than a list of multiple concrete operations.	2 / 3
Completeness	Clearly answers both what it does (MCP Apps integration for json-render) and when to use it via an explicit "Use when building... or when integrating..." clause, so both halves are present with explicit triggers.	3 / 3
Trigger Term Quality	Includes natural terms a developer would say when needing this skill — "MCP servers", "interactive UIs", "json-render", and the specific client names "Claude, ChatGPT, Cursor, or VS Code" plus "Model Context Protocol" — giving good coverage of likely phrasings.	3 / 3
Distinctiveness Conflict Risk	The json-render + MCP Apps pairing with named clients is a clear, narrow niche unlikely to trigger for unrelated skills, with distinct triggers tied to a specific package ecosystem.	3 / 3
	Total	11 / 12 Passed

Validation

100%

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 — 16 / 16 Passed

Validation for skill structure

No warnings or errors.

Repository: vercel-labs/json-render
Path: skills/mcp/SKILL.md
Commit: 9d3dfc8

Reviewed: about 12 hours ago

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