favicon-generator
Generate flat favicons from image prompts, then key out a magenta background and build PNG/ICO/WebP outputs with ImageMagick. Use when you need a reliable favicon workflow.
85
77%
Does it follow best practices?
Impact
100%
3.57xAverage score across 3 eval scenarios
Passed
No known issues
Optimize this skill with Tessl
npx tessl skill review --optimize ./tests/ext_conformance/artifacts/agents-mikeastock/skills/favicon-generator/SKILL.mdQuality
Discovery
67%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 excels at specificity and distinctiveness, clearly outlining a unique favicon generation pipeline with concrete technical details. However, the 'Use when' clause is too generic ('reliable favicon workflow') and doesn't provide natural trigger terms a user would actually say. The trigger term coverage also misses common synonyms like 'site icon' or 'browser icon'.
Suggestions
Expand the 'Use when' clause with specific trigger scenarios, e.g., 'Use when the user asks to create a favicon, site icon, browser tab icon, or needs to convert an image to .ico format.'
Add common user-facing synonyms like 'website icon', 'browser icon', 'tab icon', and '.ico file' to improve trigger term coverage.
| Dimension | Reasoning | Score |
|---|---|---|
Specificity | Lists multiple specific concrete actions: generating flat favicons from image prompts, keying out magenta backgrounds, and building PNG/ICO/WebP outputs with ImageMagick. These are detailed, actionable capabilities. | 3 / 3 |
Completeness | The 'what' is well-covered with specific actions. There is a 'Use when' clause, but 'when you need a reliable favicon workflow' is vague and doesn't provide explicit trigger scenarios—it essentially restates the skill rather than describing when to select it (e.g., 'when the user asks for a favicon, site icon, or browser tab icon'). | 2 / 3 |
Trigger Term Quality | Includes some relevant keywords like 'favicon', 'PNG', 'ICO', 'WebP', and 'ImageMagick', but misses common user variations like 'website icon', 'browser icon', 'tab icon', or '.ico file'. The phrase 'image prompts' is somewhat ambiguous. | 2 / 3 |
Distinctiveness Conflict Risk | The combination of favicon generation, magenta background keying, and specific output formats (PNG/ICO/WebP) with ImageMagick creates a very distinct niche that is unlikely to conflict with other skills. | 3 / 3 |
Total | 10 / 12 Passed |
Implementation
87%Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.
This is a well-crafted skill with concrete, actionable commands and a clear workflow for generating favicons. The prompt template, shell commands, HTML snippets, and manifest JSON are all copy-paste ready. The main weakness is the lack of explicit validation steps between the conversion and HTML integration phases, particularly given that magenta keying can fail (as acknowledged in the pitfalls section).
Suggestions
Add an explicit validation step after running faviconize.sh, e.g., 'Verify the transparent PNG has no magenta remnants by inspecting it before proceeding to HTML integration.'
| Dimension | Reasoning | Score |
|---|---|---|
Conciseness | The content is lean and efficient. Every section serves a purpose—prereqs, prompt template, generation, conversion, HTML integration, and pitfalls. No unnecessary explanations of what favicons are or how ImageMagick works. The only minor verbosity is listing three agent paths, but that's practical guidance. | 3 / 3 |
Actionability | Provides concrete, copy-paste-ready commands for generation and conversion, exact HTML snippets for integration, a complete webmanifest JSON, and specific environment variable overrides for tuning. The prompt template is fully specified with concrete values. | 3 / 3 |
Workflow Clarity | The multi-step workflow (generate → convert → integrate HTML) is clearly sequenced, but there are no explicit validation checkpoints. After running faviconize.sh there's no step to verify the magenta was properly keyed out or that outputs are correct before updating HTML. For a workflow involving image manipulation and potential magenta bleeding issues, a validation step would be important. | 2 / 3 |
Progressive Disclosure | Content is well-structured with clear sections progressing from prereqs through generation, conversion, HTML integration, and troubleshooting. References to external skills (Nano Banana Pro) are one level deep and clearly signaled. The faviconize.sh script is appropriately kept external. Optional tuning is separated from the main flow. | 3 / 3 |
Total | 11 / 12 Passed |
Validation
100%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
- Dicklesworthstone/pi_agent_rust
- Commit
6e3d68c
- Reviewed
Table of Contents
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