Vizuara Books
DeepSeek Harness
Everything is a plugin.
DeepSeek released an agent harness on 13 August 2026 and it passed 165,000 GitHub stars in six days. This is a full read of it: Cordis, profiles and bundles, the turn and step loop, the append-only session log, the tool pipeline, and the capability seams that make one provider swap change the whole product.
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00The Record3 capsules
What DeepSeek Harness is, why it broke a GitHub record in a week, and the one sentence the whole design follows from.
01The fastest star in GitHub historySTART13 min02Agent = model + harnessTHESIS14 min03Running itdsh14 min01Cordis5 capsules
The plugin framework underneath. Five ideas, and the dispatch semantics everything else is written against.
04Cordis in five ideasCORDIS16 min05Services and the context treectx16 min06Typed events and dispatch modesEVENTS17 min07Waterfalls and around-middlewarenext()16 min08Reversible effectseffect16 min02Composition3 capsules
How a running dsh is assembled out of ordered layers, and how to change any row in it without forking.
09Profiles and bundlesBOOT14 min10The layer stackLAYERS16 min11Patching the treePATCH14 min03The Loop5 capsules
One turn, traced from the inbox to the last tool result.
12The agent interfaceAGENT16 min13Turns and stepsTURN18 min14The inbox and pre-stepINBOX17 min15The request pathREQUEST17 min16Stopping and recoveringSTOP16 min04The Log3 capsules
The append-only stream that every other feature is derived from.
17Model-visible means loggedINVARIANT16 min18deriveMessages and replayREPLAY18 min19Forking, resuming and transcriptsFORK20 min05Tools and Seams3 capsules
How a capability becomes available to a model, and how one swap moves the whole product.
20The tool registryTOOLS18 min21The tool execution pipelinePIPELINE15 min22Capability seamsSEAM18 min06Building On It2 capsules
Writing your own plugin, and deciding what is worth building.
23Writing your first pluginBUILD16 min24What to build, and what to wait forPREVIEW17 minRatings & reviews
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