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implementing-mcp-ui-apps

Guide for adding MCP UI apps — interactive visualizations that render tool results in MCP clients like Claude Desktop. Use when adding a new detail or list view for an MCP tool, creating view components in products/*/mcp/apps/, or linking tools to UI apps via YAML.

75

Quality

93%

Does it follow best practices?

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SKILL.md
Quality
Evals
Security

Quality

Content

87%

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

A dense, action-oriented reference for a codebase convention with executable examples and good structure. Its one weakness is the Quick workflow, which omits an explicit validate/verify step for the generated-output batch operation.

Suggestions

Add an explicit validation/verify step to the Quick workflow (e.g. 'run generate:ui-apps, confirm no diff / build passes, then commit') so the generate-then-build loop has an inline checkpoint.

Surface the CI up-to-date check as part of the workflow rather than only in a later section, so the feedback loop is visible where the action is performed.

DimensionReasoningScore

Conciseness

Assumes Claude's competence — never explains what React, YAML, or MCP is — and every section earns its place with executable specifics rather than padded concept prose.

3 / 3

Actionability

Provides copy-paste-ready TSX/YAML/TypeScript examples, exact commands ('pnpm --filter=@posthog/mcp run generate:ui-apps'), and concrete file paths — fully executable, not pseudocode.

3 / 3

Workflow Clarity

The Quick workflow lists numbered steps and build commands, but the generate-then-build batch operation lacks an inline validation checkpoint; verification is only mentioned separately under CI, so per the rubric this caps the score.

2 / 3

Progressive Disclosure

Self-contained body organized into clearly labeled sections with a single one-level-deep external reference ([services/mcp/CONTRIBUTING.md]) that is explicitly signaled.

3 / 3

Total

11

/

12

Passed

Description

100%

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

A concise, well-constructed description that states concrete capabilities and gives an explicit 'Use when' trigger clause with natural keyword coverage. Third-person voice is maintained throughout.

DimensionReasoningScore

Specificity

Names multiple concrete actions — 'adding a new detail or list view', 'creating view components in products/*/mcp/apps/', 'linking tools to UI apps via YAML' — matching the 'lists multiple specific concrete actions' anchor.

3 / 3

Completeness

Explicitly states what it does ('interactive visualizations that render tool results in MCP clients') and when to use it ('Use when adding a new detail or list view...'), satisfying both halves.

3 / 3

Trigger Term Quality

Covers natural trigger terms a developer would say ('detail or list view', 'MCP tool', 'view components', 'YAML', 'Claude Desktop') alongside an explicit 'Use when' clause; not jargon-only.

3 / 3

Distinctiveness Conflict Risk

Targets a clear niche (MCP UI apps) with distinct, specific triggers unlikely to overlap with unrelated skills.

3 / 3

Total

12

/

12

Passed

Validation

93%

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

Validation15 / 16 Passed

Validation for skill structure

CriteriaDescriptionResult

relative_links

Relative link issues: 2 suspicious

Warning

Total

15

/

16

Passed

Repository
PostHog/posthog
Reviewed

Table of Contents

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