DeepSeek Harness v0.1.0-rc.8: native image requests plus Claude Code/Codex sub-agents

On August 19, the open-source agent framework DeepSeek Harness shipped v0.1.0-rc.8, just two days after RC.7. The release centers on filling multimodal gaps and refactoring the sub-agent system.

On the multimodal side, the DeepSeek model adapter now supports native image requests; core commands like /goal and /plan can carry image attachments, and the @ menu has been expanded with file and historical-conversation references so screenshots, local files, and past dialogue can become context for the agent. To avoid dropped attachments across MCP/ACP sessions, RC.8 persists image attachments across call chains and fixes issues caused by oversized images and stacked historical images.

On sub-agents: Claude Code and Codex are no longer pre-bundled with the main product. Both are now installable Profile Bundles, exposed as callable sub-agent tools via dsh-tool-subagent. Codex adds a non-interactive permission mode plus support for multiple named instances, so several Codex sub-agents with different configurations can run in parallel. The sub-agent reportDelivery path now feeds back promptly and wakes the parent task to avoid blind waiting. The pattern pushes DeepSeek Harness toward an "agent-era scheduler": the parent agent decomposes tasks and orchestrates flow; sub-agents execute on the call stack.

Other improvements include concurrent queries in web_search, persistent PowerShell sessions in the Windows PTY terminal (enabled by default in Minimal preset), and significant SQLite read/write/fork performance gains with lower storage overhead. The team also registered the "DeepSeek Harness" trademark and updated brand usage guidelines.