Engineering

How we build at the frontier of AI — system prompts, agents, harnesses and the engineering behind Synscribe. For developers who want to work on this.

How Anthropic Builds Claude's System Prompts? And What It Taught Us About Building AI Harnesses?
prompt-engineering
engineering
How Anthropic Builds Claude's System Prompts? And What It Taught Us About Building AI Harnesses?Most teams write their system prompt as a Markdown file. Anthropic compiles theirs. We decompiled the Claude Code CLI (a Bun binary) and the Claude Desktop app (an Electron bundle) to recover how their system prompts are assembled, varied per model, and defended against specific failure modes. You see the server-controlled injection slot, the full tool inventory, and a reproducible extraction method.

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