Originally published on rohitraj.tech
DeepSeek open-sourced its agent harness on August 13, 2026 under MIT — 572 points on Hacker News in a day. Every page currently ranking for "DeepSeek Harness vs Claude Code" describes a different, older product. Here is what v0.1 actually ships: the Cordis plugin kernel, the real cordis.yml keys, 53 built-in tools, and the one config default that decides whether it touches your repo.
Read the full version with code samples, diagrams, and architecture details: DeepSeek Harness vs Claude Code vs Codex CLI: The v0.1 Developer Preview, Honestly — 2026
More engineering notes: rohitraj.tech/en/notes
