rails-engine-compatibility

Use when maintaining compatibility for Rails engines across Rails and Ruby versions. Trigger words: Zeitwerk, autoloading, Rails upgrade, dependency bounds, gemspec, feature detection, CI matrix, reload safety, deprecated APIs, cross-version support.

Quality

56%

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 ./rails-engine-compatibility/SKILL.md

Quality

Discovery

54%

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 has strong trigger term coverage but critically lacks specificity about what concrete actions the skill performs. It reads more like a tag list than a functional description. The 'what' component needs substantial improvement to describe actual capabilities like configuring autoloaders, updating dependency constraints, or setting up cross-version test matrices.

Suggestions

Add specific concrete actions the skill performs, e.g., 'Configures Zeitwerk autoloading for Rails engines, updates gemspec dependency bounds, sets up CI matrices for cross-version testing, replaces deprecated APIs with feature detection patterns.'

Restructure to lead with capabilities before the trigger clause, e.g., 'Configures autoloading, updates dependency constraints, and implements feature detection for Rails engines targeting multiple Rails/Ruby versions. Use when...'

Dimension	Reasoning	Score
Specificity	The description does not list any concrete actions or capabilities. It only mentions 'maintaining compatibility' which is vague. There are no specific actions like 'configure Zeitwerk autoloading', 'update gemspec dependency bounds', or 'set up CI matrix'.	1 / 3
Completeness	It has a 'Use when' clause addressing when to use the skill, but the 'what does this do' part is extremely weak — it only says 'maintaining compatibility for Rails engines' without describing specific actions or capabilities. The 'when' is present but the 'what' is insufficient.	2 / 3
Trigger Term Quality	The description includes a comprehensive list of natural trigger terms that users would actually say: 'Zeitwerk', 'autoloading', 'Rails upgrade', 'dependency bounds', 'gemspec', 'feature detection', 'CI matrix', 'reload safety', 'deprecated APIs', 'cross-version support'. These cover many relevant variations.	3 / 3
Distinctiveness Conflict Risk	The trigger terms like 'Zeitwerk', 'gemspec', and 'CI matrix' provide some distinctiveness, but terms like 'Rails upgrade', 'deprecated APIs', and 'cross-version support' could overlap with general Rails upgrade or migration skills. The lack of specific actions makes it harder to distinguish from other Rails-related skills.	2 / 3
	Total	8 / 12 Passed

Implementation

57%

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

This is a reasonably well-organized skill with good structure and clear integration points, but it suffers from redundancy across multiple sections (Quick Reference, Common Mistakes, Red Flags, Common Review Findings, and Rules all overlap) and lacks concrete actionability in its core workflow. The examples provided are good but don't cover all the key areas mentioned, particularly feature detection patterns.

Suggestions

Consolidate the overlapping sections (Common Mistakes, Red Flags, Common Review Findings) into a single 'Pitfalls' table to reduce redundancy and improve conciseness.

Add a concrete code example for feature detection using `respond_to?` or adapter seams as an alternative to `Rails.version` checks, since this is a central recommendation.

Add explicit validation checkpoints to the Core Checks workflow, e.g., 'Run `bundle exec rake zeitwerk:check` to verify autoloading' and 'Run CI matrix before claiming version support'.

Dimension	Reasoning	Score
Conciseness	The content is mostly efficient but has some redundancy — the 'Common Mistakes' table largely duplicates information from the 'Quick Reference' table and 'Rules' section. The 'Red Flags' and 'Common Review Findings' sections also overlap significantly. Could be tightened by consolidating.	2 / 3
Actionability	The examples for gemspec bounds, Zeitwerk naming, and reload-safe hooks are concrete and executable. However, the 'Core Checks' section is a vague numbered list without specific commands or code (e.g., 'Check autoloading and Zeitwerk expectations' — how exactly?). Feature detection guidance lacks a concrete example of using `respond_to?` or adapter seams.	2 / 3
Workflow Clarity	The 'Core Checks' section provides a sequence but lacks validation checkpoints or feedback loops. For a skill involving potentially destructive compatibility changes across multiple Rails versions, there's no explicit 'validate then proceed' pattern — just a list of things to check without clear verification steps.	2 / 3
Progressive Disclosure	The content is well-structured with clear sections, tables for quick scanning, and an Integration table pointing to related skills with clear 'when to chain' guidance. For a skill of this size (~100 lines), the organization is appropriate without needing external file references.	3 / 3
	Total	9 / 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 — 11 / 11 Passed

Validation for skill structure

No warnings or errors.

Repository: igmarin/rails-agent-skills
Commit: ae8ea63

Reviewed: 3 days ago

Table of Contents

Discovery Implementation Validation

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