implementing-real-user-monitoring

Implement Real User Monitoring (RUM) to capture actual user performance data including Core Web Vitals and page load times. Use when setting up user experience monitoring or tracking custom performance events. Trigger with phrases like "setup RUM", "track Core Web Vitals", or "monitor real user performance".

Install with Tessl CLI

npx tessl i github:jeremylongshore/claude-code-plugins-plus-skills --skill implementing-real-user-monitoring

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Review — 60%

Does it follow best practices?

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npx tessl skill review --optimize ./path/to/skill

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Validation — 13 / 16 Passed

Validation for skill structure

SKILL.md

Review

Evals

Discovery

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.

This is a well-crafted skill description that excels across all dimensions. It provides specific capabilities (RUM implementation, Core Web Vitals, page load times), explicit 'Use when' guidance, and concrete trigger phrases. The technical specificity around Real User Monitoring creates a distinct niche that minimizes conflict with other performance-related skills.

Dimension	Reasoning	Score
Specificity	Lists multiple specific concrete actions: 'Implement Real User Monitoring (RUM)', 'capture actual user performance data', 'Core Web Vitals', 'page load times', 'tracking custom performance events'. These are concrete, actionable capabilities.	3 / 3
Completeness	Clearly answers both what (implement RUM, capture user performance data, Core Web Vitals, page load times) AND when ('Use when setting up user experience monitoring or tracking custom performance events') with explicit trigger phrases provided.	3 / 3
Trigger Term Quality	Excellent coverage of natural terms users would say: 'setup RUM', 'track Core Web Vitals', 'monitor real user performance', 'user experience monitoring', 'custom performance events'. Includes both technical terms (RUM, Core Web Vitals) and natural language variations.	3 / 3
Distinctiveness Conflict Risk	Clear niche focused specifically on Real User Monitoring and Core Web Vitals. The specific technical domain (RUM, performance monitoring from user perspective) distinguishes it from general performance testing or synthetic monitoring skills.	3 / 3
	Total	12 / 12 Passed

Implementation

20%

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

This skill content is primarily descriptive rather than instructive, explaining what RUM is and what the skill does rather than providing actionable implementation guidance. It lacks any executable code examples despite being a technical implementation skill, and contains significant redundancy across multiple sections that describe the same concepts. The content would benefit from being condensed to essential guidance with concrete, copy-paste ready code snippets.

Suggestions

Replace the abstract 'Examples' section with actual executable JavaScript code for implementing Core Web Vitals tracking (e.g., using web-vitals library or Performance API)

Remove redundant sections ('Overview', 'How It Works', 'When to Use') and consolidate into a brief intro followed immediately by implementation code

Add concrete code snippets for at least one RUM platform (e.g., Datadog RUM initialization, custom event tracking)

Include a validation step in the workflow showing how to verify RUM data is being collected correctly (e.g., checking network requests, platform dashboard verification)

Dimension	Reasoning	Score
Conciseness	Extremely verbose with extensive explanations of concepts Claude already knows (what RUM is, what Core Web Vitals are, how platforms work). Multiple redundant sections ('Overview', 'How It Works', 'When to Use') that repeat similar information. The 'Examples' section describes what the skill will do rather than providing actual code.	1 / 3
Actionability	No executable code provided despite being a technical implementation skill. Examples describe what 'the skill will do' abstractly rather than providing concrete JavaScript snippets for RUM implementation. Instructions are high-level bullet points without specific commands or copy-paste ready code.	1 / 3
Workflow Clarity	Steps are listed in the Instructions section but lack validation checkpoints. No feedback loops for verifying RUM implementation is working correctly. Error Handling section exists but provides only a checklist of things to check rather than a clear diagnostic workflow.	2 / 3
Progressive Disclosure	Content is organized into sections but is monolithic - everything is in one file with no references to external detailed documentation. The Resources section lists topics but provides no actual links or file references. Content that could be split (platform-specific implementations, detailed code examples) is either missing or would bloat this file.	2 / 3
	Total	6 / 12 Passed

Validation

81%

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 — 13 / 16 Passed

Validation for skill structure

Criteria	Description	Result
allowed_tools_field	'allowed-tools' contains unusual tool name(s)	Warning
metadata_version	'metadata' field is not a dictionary	Warning
frontmatter_unknown_keys	Unknown frontmatter key(s) found; consider removing or moving to metadata	Warning

	Total	13 / 16 Passed

Reviewed: about 1 month ago

Table of Contents

Discovery Implementation Validation

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