Overview
- DeepSeek published the DeepSeek Harness on GitHub as an MIT-licensed developer preview and made the codebase available as a reference implementation for developers.
- The project is built so every core piece — the model adapter, tool registry, session log, and agent loop — is a replaceable plugin to let teams swap or add components without changing the core runtime.
- The harness keeps an append-only session event log so every input that reaches a model is reconstructable, which enables resume, fork, replay, transcripts, and telemetry features from the same event stream.
- Local execution enforces strict sandboxing by wrapping subprocesses with Linux Landlock, macOS Seatbelt, or a Windows restricted-token runner to limit process privileges.
- The repo drew rapid attention from developers, supports multiple providers and compatibility bridges, and currently does not accept external pull requests while asking contributors to build plugins and use GitHub Discussions.