Content
61%Weight 40%Scale 1-5Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.
A strong, concrete, code-heavy skill: installation, full templates, and a complete renderer/composer implementation make it immediately usable. Its weaknesses are the padded 'Why MJML?' rationale, an implicit rather than explicit workflow with no verification checkpoint, and a couple of undefined helper symbols (GetSampleVariables, value-object types).
Suggestions
Add an explicit numbered workflow (install package → add templates as embedded resources → create renderer → compose → verify via '/admin/emails/preview/{template}') that frames the preview endpoint as a validation checkpoint, raising workflow clarity.
Cut or compress the 'Why MJML?' section — Claude already knows email clients render HTML inconsistently — and trim the layout boilerplate to the parts users must customize.
Define or stub GetSampleVariables and the value-object types (EmailAddress, PersonName, AbsoluteUri, EmailMessage) so all code is truly copy-paste ready.
| Dimension | Reasoning | Score |
|---|---|---|
Conciseness | The 'Why MJML?' section explains a concept Claude already knows ('Email HTML is notoriously difficult. Each email client (Outlook, Gmail, Apple Mail) renders differently, requiring complex table-based layouts and inline styles'), which is padding. The bulk (templates, renderer code) earns its place, but the problem/solution framing and long _Layout.mjml boilerplate could be tightened. | 3 / 5 |
Actionability | Highly executable: 'dotnet add package Mjml.Net', a complete csproj ItemGroup, a full copy-paste-ready MjmlTemplateRenderer class, a complete composer, and DO/DON'T pairs. Minor gaps only: 'GetSampleVariables(template)' is called in the preview endpoint but never defined, and the EmailMessage/value-object types (EmailAddress, PersonName, AbsoluteUri) are used without definition. | 4 / 5 |
Workflow Clarity | Section order implies a sequence (install → structure → layout → content → renderer → composer → preview) but no explicit workflow or checkpoints are stated, and validation is only implicit — the renderer's 'if (result.Errors.Any()) throw' handles compile errors, but there is no instructed step like 'preview the rendered email to verify' tying the preview endpoint into the flow. Not a destructive/batch skill, so no hard cap applies. | 3 / 5 |
Progressive Disclosure | No bundle files exist (references/, scripts/, assets/ are absent), so everything lives in a well-sectioned single SKILL.md with clear headers and external resource links. Structure is good and easy to navigate, but ~390 lines with a components reference table and full layout boilerplate inline is on the edge of content that could be split into reference files — minor organization gap rather than a flaw. | 4 / 5 |
Total | 14 / 20 Passed |