slack-gif-creator
Knowledge and utilities for creating animated GIFs optimized for Slack. Provides constraints, validation tools, and animation concepts. Use when users request animated GIFs for Slack like "make me a GIF of X doing Y for Slack."
91
77%
Does it follow best practices?
Impact
92%
2.19xAverage score across 10 eval scenarios
Passed
No known issues
Optimize this skill with Tessl
npx tessl skill review --optimize ./examples/slack-gif-creator/SKILL.mdQuality
Discovery
89%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 solid description with clear trigger terms and an explicit 'Use when' clause with an example user utterance. Its main weakness is that the capabilities listed are somewhat abstract ('constraints, validation tools, and animation concepts') rather than enumerating specific concrete actions. The Slack-specific GIF niche makes it highly distinctive.
Suggestions
Replace abstract terms like 'constraints, validation tools, and animation concepts' with specific actions such as 'generates frame-by-frame animations, validates file size and dimensions for Slack limits, applies optimization for smooth playback'.
| Dimension | Reasoning | Score |
|---|---|---|
Specificity | The description names the domain (animated GIFs for Slack) and mentions some capabilities ('constraints, validation tools, and animation concepts'), but these are somewhat abstract rather than listing concrete actions like 'create frame-by-frame animations, optimize file size, validate dimensions'. | 2 / 3 |
Completeness | Clearly answers both 'what' (knowledge and utilities for creating animated GIFs optimized for Slack, constraints, validation, animation concepts) and 'when' (explicit 'Use when users request animated GIFs for Slack' with an example trigger phrase). | 3 / 3 |
Trigger Term Quality | Includes strong natural trigger terms: 'animated GIFs', 'Slack', 'GIF', and provides a realistic user utterance example ('make me a GIF of X doing Y for Slack'). These are terms users would naturally say. | 3 / 3 |
Distinctiveness Conflict Risk | The combination of 'animated GIFs' + 'Slack' creates a very specific niche that is unlikely to conflict with general image creation, video, or other messaging platform skills. | 3 / 3 |
Total | 11 / 12 Passed |
Implementation
64%Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.
This is a solid, actionable skill with good executable examples and clear utility documentation. Its main weaknesses are the lack of an integrated validation step in the core workflow (validators exist but aren't shown as mandatory checkpoints) and the monolithic structure that could benefit from splitting animation concepts and drawing guidance into separate referenced files. Some sections like 'Philosophy' and parts of 'Making Graphics Look Good' add verbosity without proportional value.
Suggestions
Integrate `validate_gif()` as an explicit checkpoint in the Core Workflow section (e.g., step 4: validate, step 5: if errors fix and re-validate) rather than documenting it separately.
Move the 'Animation Concepts' section to a separate ANIMATIONS.md reference file and link to it, reducing the main skill's length and improving progressive disclosure.
Remove or significantly trim the 'Philosophy' section — Claude doesn't need meta-explanation of what the skill provides vs. doesn't provide; the content itself demonstrates this.
| Dimension | Reasoning | Score |
|---|---|---|
Conciseness | The skill is mostly efficient but includes some unnecessary sections like the 'Philosophy' block explaining what the skill does/doesn't provide, and the 'Making Graphics Look Good' section is somewhat verbose with advice Claude could infer. The 'Don't use emoji fonts' note and user upload guidance are useful, but the overall content could be tightened by ~20%. | 2 / 3 |
Actionability | The skill provides fully executable code examples throughout — the core workflow is copy-paste ready with GIFBuilder, PIL drawing primitives are shown with concrete syntax, utility imports are specific, and easing/validation usage is demonstrated with real function calls and parameters. | 3 / 3 |
Workflow Clarity | The core workflow has a clear 3-step sequence (create builder → generate frames → save), and validation utilities are documented. However, there's no explicit validation checkpoint in the workflow itself — the validator exists but isn't integrated into the core workflow as a mandatory step before declaring the GIF ready. For a process producing output files, this gap matters. | 2 / 3 |
Progressive Disclosure | The content is well-organized with clear section headers and logical grouping, but it's a fairly long monolithic file (~180 lines of content). The animation concepts section and drawing guidance could be split into referenced files. No bundle files are provided, so there's no actual progressive disclosure structure despite the skill referencing module paths like 'core.gif_builder' and 'core.validators'. | 2 / 3 |
Total | 9 / 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
- douglasvought/wiggle-skills
- Commit
b27906e
- Reviewed
Table of Contents
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