SYSTEM PROMPTS

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Anthropic Removed 80% of Claude Code's System Prompt. Here Is What They Learned.

Anthropic cut 80% of Claude Code's system prompt for Opus 5 and Fable 5 with zero regression on coding evals. The post landed on HN with 197 points and 133 comments. Here is what the article says, what HN thinks, and what it means for your agent harness.

July 26, 2026•7 min read

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Context Engineering: The Highest-Leverage Skill in AI-Assisted Development

Context engineering is the practice of designing the persistent information that surrounds every AI interaction. CLAUDE.md files, system prompts, skill libraries, and memory systems. It is the single highest-leverage skill for developers working with AI agents in 2026.

Context Engineering Claude Code AI Agents

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SYSTEM PROMPTS

Anthropic Removed 80% of Claude Code's System Prompt. Here Is What They Learned.

Context Engineering: The Highest-Leverage Skill in AI-Assisted Development

Keep exploring System Prompts

Get Smarter About AI Dev

SYSTEM PROMPTS

Anthropic Removed 80% of Claude Code's System Prompt. Here Is What They Learned.

Context Engineering: The Highest-Leverage Skill in AI-Assisted Development

Keep exploring System Prompts

Get Smarter About AI Dev