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Claude Code is Going Spec-Driven (New Anthropic Paper)

12.7K views· 366 likes· 8:59· Dec 3, 2025

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Anthropic published research on how they are building agents that can effectively work on long tasks - and the answer is making them code like we do. The paper focuses on their two-agent system: an Initializer that sets up the environment and creates a task list, and a reusable Coding agent that works incrementally, one feature at a time. This is not another SDD framework yet, but the key insight is to use JSON instead of Markdown for planning because models are apparently less likely to edit them. TBH: It pretty much validates everything I have been saying about building with AI. In this video, I break down Anthropic's "Effective Harnesses for Long-Running Agents" and explain why this validates the spec-driven development approach I've been teaching. ⏱️ TIMESTAMPS 0:00 – Intro: Anthropic's New Research 1:07 – The Core Problem: Context Windows 1:37 – The Solution: Two-Agent System 2:21 – Why Agents Fail (One-Shotting & Premature Completion 🤨) 3:09 – Initializer Agent Setup 4:03 – Why JSON Beats Markdown 5:19 – Git Commits & Progress Tracking 5:50 – Testing & Verification 6:33 – The Full Workflow 7:45 – Final Thoughts 🔗 RESOURCES Anthropic Blog: https://www.anthropic.com/engineering/effective-harnesses-for-long-running-agents Book a call with me → https://yedatechs.com/#container06 Sponsorship inquiries → hi@yedatechs.com #Anthropic #ClaudeCode #AIAgents #AIDevelopment #DeveloperWorkflow

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