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Claude skills for extending Claude

4 skills in the bank are filed under Extend. They are grouped here because they compete for the same jobs - which is the reason an agent reaching for one of them sometimes gets another.

• Claude APIanthropics/skillsBuilding something that calls Claude: model ids, pricing, streaming, tool use, prompt caching, token counting. Reach for it before guessing an API detail from memory.
• MCP Builderanthropics/skillsBuild an MCP server so Claude can reach an outside service or API through tools you designed. The plumbing between Claude and someone else's system.
• Skill Creatoranthropics/skillsMaking skills, not using them: package a workflow you keep repeating into a skill, then test whether it actually fires when it should.
• Slack GIF Creatoranthropics/skillsAnimated GIFs built to survive Slack's size and dimension limits. For when someone says make me a GIF of X doing Y.