New coding harness that seems to have some novel concepts and one of the pretty cool things on their landing page for it here: https://deepseek.com/harness/en/ is the Every Run is Traceable view:

"Everything the model sees is recorded in an append-only session log: system prompts, reasoning, tool calls and results, subagent scheduling, and every context injection. In the Trajectory view, you can inspect these records by source. Resume, fork, search, and replay all operate on the same event stream."

Seems pretty helpful - have sort of wanted something similar (I use Pi).

They also released this research paper that backs their whole plugin composability system that seems pretty cool: https://github.com/cordiverse/paper