Sequential Think is a production-ready Claude Code skill (quality score 70/100) in the research-methods sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/sequential-think/ and loads when your prompt matches the skill's trigger.
When to invoke it: Use when: (1) Complex debugging scenarios with multiple layers, (2) Architectural analysis and system design, (3) Problems requiring hypothesis testing and validation, (4) Multi-component failure investigation, (5) Performance bottleneck identification. Triggers: "--think", "--think-hard", "--ultrathink", "analyze step by step", "break down this problem", "systematic analysis".
The Sequential Think skill is built for researchers, data scientists, academics, and analysts working with complex data and scientific literature. It is part of the open ClaudSkills registry, a community-curated catalog of 15,000+ capabilities you can install for Claude Code — the Claude CLI agent.
mkdir -p ~/.claude/skills/sequential-think curl -L https://claudskills.com/skills/sequential-think/SKILL.md \ -o ~/.claude/skills/sequential-think/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/sequential-think/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/sequential-think/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\sequential-think\SKILL.md on Windows. See the full install guide for step-by-step instructions.
The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.
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