Agent SDK Dev
By Anthropic
Development kit for working with the Claude Agent SDK
Marketplace
Outputai
By Output.aiAI & Agents
Output.ai workflow development toolkit for Claude Code. Adds 5 specialist agents (planner, builder, debugger, prompt writer, quality reviewer), 40+ slash-command skills covering scaffolding, debugging, evaluation, and credential management, plus a SessionStart hook that auto-loads Output SDK conventions so Claude understands the framework before the first prompt.
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Analyze codebases and recommend tailored Claude Code automations such as hooks, skills, MCP servers, and subagents.