slack-gif-creator

Quick Review

Excellent skill that comprehensively addresses Slack GIF creation with clear constraints, extensive animation primitives, and practical composition patterns. The SKILL.md provides complete task knowledge including Slack's specific requirements (64KB emoji limit, 2MB message limit), 13+ composable animation primitives with code examples, optimization strategies, and real-world composition patterns. The description accurately captures the skill's purpose and trigger conditions. Structure is clear with logical organization into validators, primitives, and helpers, though the single-file format is lengthy (appropriate given the toolkit nature). Novelty is strong - creating Slack-optimized GIFs with strict size constraints (especially 64KB emoji limit) requires specialized knowledge about color quantization, frame optimization, and animation techniques that would consume many tokens for a CLI agent to discover through trial and error. The skill meaningfully reduces cost by encoding domain expertise about Slack's technical constraints and providing pre-built, tested animation primitives.