DeepSeek Harness v0.2.1-alpha.4: UI Reasoning Tiers and Custom Plugin Indexes (Oct 2026)
DeepSeek shipped version 0.2.1-alpha.4 of DeepSeek Harness (DSH) on October 15, 2026. Two features lead the release: reasoning levels for individual custom API models can now be set in the UI instead of by editing configuration files, and DSH can discover and install plugins from custom plugin index sources. Five bug fixes cover command input, failed-command status, Office/PDF file delivery, the Developer Tools panel, and Linux startup. One change matters to plugin authors: engines.dsh now takes priority when a plugin declares it. DSH remains a pre-release developer preview, so expect breaking changes. If you are already on the alpha line, this patch is worth taking.
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