slack-gif-creator

Toolkit for creating animated GIFs optimized for Slack, with validators for size constraints and composable animation primitives. This skill applies when users request animated GIFs or emoji animations for Slack from descriptions like "make me a GIF for Slack of X doing Y".

4.65x

Quality

—

Does it follow best practices?

Impact

93%

4.65x

Average score across 3 eval scenarios

Securityby

Passed

No known issues

Quality

Content

70%

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

The content is highly actionable with executable code throughout and a sensible high-level workflow, but it is verbose and presented as a single long document with no progressive disclosure into bundle files. Validation feedback loops are present but not woven tightly into the main workflow steps.

Suggestions

Move the per-primitive API reference (shake, bounce, spin, etc.) into a references/ file (e.g. PRIMITIVES.md) and keep only a quick-start plus composition patterns in SKILL.md, linking one level deep.

Tighten redundant content: the optimization strategies restate the emoji size limits, and easing appears in both the move primitive and the helper utilities section — consolidate to a single location.

Make the validate->fix->retry loop explicit in the example workflows (e.g., after builder.save, call check_slack_size and only proceed when passes is True, else reduce frames/colors and re-save) rather than leaving validation as an implicit final step.

Dimension	Reasoning	Score
Conciseness	The body is largely efficient with executable snippets, but it is long (~640 lines) and repeats guidance (e.g., optimization strategies echo the Slack requirements section, easing is shown twice across primitives and helper utilities), so some content could be tightened.	2 / 3
Actionability	Provides fully executable, copy-paste-ready code across validators, primitives, helpers, and full example compositions with concrete function signatures and arguments, meeting the highest anchor.	3 / 3
Workflow Clarity	The Philosophy section sequences the work (understand, design, apply, validate, iterate) and the optimization section gives feedback for over-size GIFs, but validation checkpoints are implicit rather than enforced as validate->fix->retry loops within the main workflows, which caps it at 2.	2 / 3
Progressive Disclosure	Content is well-organized into sections but is monolithic inline within SKILL.md: no references/, scripts/, or assets/ bundle files exist, and the doc references many modules (core., templates.) with no linkable deeper materials, so structure is present but external disclosure is absent.	2 / 3
	Total	9 / 12 Passed

Description

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.

The description is strong: it states concrete capabilities, includes natural trigger terms with an example user phrasing, and explicitly covers both what the skill does and when to use it. It occupies a clear niche unlikely to conflict with other skills.

Dimension	Reasoning	Score
Specificity	Lists multiple concrete capabilities: 'creating animated GIFs optimized for Slack', 'validators for size constraints', and 'composable animation primitives', matching the anchor that lists several specific concrete actions.	3 / 3
Completeness	Explicitly answers both what ('Toolkit for creating animated GIFs optimized for Slack, with validators...') and when ('This skill applies when users request animated GIFs or emoji animations for Slack from descriptions like...'), meeting the explicit-trigger bar for a 3.	3 / 3
Trigger Term Quality	Includes natural terms users would say ('animated GIFs', 'emoji animations', 'Slack') plus a quoted example trigger ('make me a GIF for Slack of X doing Y'), giving good coverage of common phrasings.	3 / 3
Distinctiveness Conflict Risk	The Slack-animated-GIF niche is distinct with specific triggers unlikely to overlap with other skills; the narrow scope of 'optimized for Slack' GIFs reduces conflict risk.	3 / 3
	Total	12 / 12 Passed

Validation

87%

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 — 14 / 16 Passed

Validation for skill structure

Criteria	Description	Result
skill_md_line_count	SKILL.md is long (648 lines); consider splitting into references/ and linking	Warning
frontmatter_unknown_keys	Unknown frontmatter key(s) found; consider removing or moving to metadata	Warning

	Total	14 / 16 Passed

Repository: davepoon/buildwithclaude
Commit: 366e45b

Reviewed: about 21 hours ago

Table of Contents

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