extended-thinking
✓Extended thinking (ultrathink) configuration for Claude API. Activate for complex reasoning tasks, deep analysis, multi-step problem solving, and tasks requiring careful deliberation. Enables Claude's internal reasoning with configurable thinking budgets.
Installation
SKILL.md
Enable Claude's extended thinking capabilities for complex reasoning tasks that benefit from internal deliberation before responding.
| Claude Opus 4.5 | ✓ Full | - | | Claude Opus 4.1 | ✓ Full | - | | Claude Opus 4 | ✓ | ✓ Summarized | | Claude Sonnet 4.5 | ✓ Full | - | | Claude Sonnet 4 | ✓ | ✓ Summarized | | Claude Haiku 4.5 | ✓ Full | - |
| Task Complexity | Budget Tokens | Use Case |
Extended thinking (ultrathink) configuration for Claude API. Activate for complex reasoning tasks, deep analysis, multi-step problem solving, and tasks requiring careful deliberation. Enables Claude's internal reasoning with configurable thinking budgets. Source: lobbi-docs/claude.
Facts (cite-ready)
Stable fields and commands for AI/search citations.
- Install command
npx skills add https://github.com/lobbi-docs/claude --skill extended-thinking- Source
- lobbi-docs/claude
- Category
- ""Writing
- Verified
- ✓
- First Seen
- 2026-02-01
- Updated
- 2026-02-18
Quick answers
What is extended-thinking?
Extended thinking (ultrathink) configuration for Claude API. Activate for complex reasoning tasks, deep analysis, multi-step problem solving, and tasks requiring careful deliberation. Enables Claude's internal reasoning with configurable thinking budgets. Source: lobbi-docs/claude.
How do I install extended-thinking?
Open your terminal or command line tool (Terminal, iTerm, Windows Terminal, etc.) Copy and run this command: npx skills add https://github.com/lobbi-docs/claude --skill extended-thinking Once installed, the skill will be automatically configured in your AI coding environment and ready to use in Claude Code or Cursor
Where is the source repository?
https://github.com/lobbi-docs/claude
Details
- Category
- ""Writing
- Source
- skills.sh
- First Seen
- 2026-02-01