DeepSeek Harness blog: install, architecture, and comparisons
Long-form notes for teams evaluating DeepSeek Harness (DSH). Each article stands on its own, cites upstream sources, and links back to install steps, run modes, tutorials, and the curated plugin directory — we do not invent benchmark scores.
Browse by topic
- What DSH is (and is not) Agent = Model + Harness, Cordis plugins, and why DSH is not a new LLM brand.
- Install & npx quickstart Node requirements, `npx @deepseek-ai/dsh web`, Windows PATH/shell notes, and first-run workspace hygiene.
- Headless --json / --session-id One-shot CLI tasks for CI: NDJSON event stream, session resume refusals, exit codes — not port 3080.
- Compare with Claude Code When to pick DSH’s plugin stack vs a single-vendor coding agent — no fake win charts.
- Modes & Trajectory Standard / PTC / Minimal / Creative presets plus replay-friendly session logs.
- Launch failures & plugin safety npx / port 3080 decision tree, plugin permission checklist, and when to pick PTC vs Standard.
- 0.1.5 RC operator notes GitHub still tags RC: default deepseek-flash, Sidebar preview, session log V3 — not API pricing.
- 0.1.7 RC operator notes Still Pre-release: scheduled tasks off, session log V4, and the ptc-runtime rename.
- CVE-2026-82533 upgrade check Builds before 0.1.2-alpha.1, npx cache, and keeping the Web UI on localhost — not a plugin checklist.
- Read Trajectory logs Session header, an unmatched tool/call, and TOOL_NOT_STARTED versus TOOL_OUTCOME_UNKNOWN.
Latest articles
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Install · macOS · Homebrew
DeepSeek Harness on macOS: Homebrew, PATH, Full Disk Access
Same npx command as every other OS — on Mac the surprises are which node is on PATH, TCC prompts, and not granting Full Disk Access on day one.
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0.1.7 · Release · Session V4 · ptc-runtime
What's New in DeepSeek Harness 0.1.7 RC
v0.1.7-rc.2 is Pre-release. Scheduled tasks stay off, session logs move to V4, and PTC names become ptc-runtime.
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Headless · --json · --session-id · CI
Run DeepSeek Harness Headless with --json
dsh --profile headless opens no port. Keep stdout for --json, treat unknown session ids as failures, and split multi-turn work into separate runs.
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Trajectory · Session log · tool/call · Troubleshoot
Read DeepSeek Harness Trajectory Logs
Start at cwd and agentPreset, then find the tool/call whose callId never received a tool/result.
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CVE-2026-82533 · Upgrade · Sandbox · Security
DeepSeek Harness CVE-2026-82533 Fix
The patch line is 0.1.2-alpha.1, not a plugin checklist and not whatever npx happened to cache.
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0.1.5 · Release · Sidebar · V4.1 Flash
What's New in DeepSeek Harness 0.1.5 RC
Headlines say 0.1.5 shipped. GitHub still tags rc.1 and rc.2. Check the default model, Sidebar, and session log V3 before you treat it as GA.
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Install · Windows · PowerShell
DeepSeek Harness on Windows: Paths, Permissions, Terminals
Same npx command as every other OS — the Windows surprises are shells, PATH, and which drive the workspace lives on.
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Install · Troubleshoot
DeepSeek Harness: Fix npx Failures and Port 3080
When the Web UI never opens, work the environment ladder before you blame the model.
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Plugins · Security
DeepSeek Harness Plugin Security Checklist
A curated install line is not a security review — treat every Cordis plugin like software that can touch your tree.
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Modes
When to Use PTC vs Standard in DeepSeek Harness
Four presets are not four personalities — pick the door that matches the job before you load community packages.
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Plugins · Install
Discover and Add a DeepSeek Harness Plugin
Finding a package is easy; adding it safely is a five-step loop you can repeat without turning Standard into a junk drawer.
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Observability
From Session Logs to Trajectory: DeepSeek Harness Observability
If you cannot say what the model saw, you do not have an agent you can review — only a transcript of the ending.
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Modes
DeepSeek Harness Modes: Standard, PTC, Minimal, Creative
Name the job first. Loading every community plugin into Standard is how previews feel haunted.
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Compare
DeepSeek Harness vs Claude Code: What Actually Changes?
Same destination — coding agents — different control surfaces. Pick by what you must replace later.
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Install
DeepSeek Harness Quickstart: npx @deepseek-ai/dsh web
From a clean machine to http://127.0.0.1:3080/ without treating the preview as a one-click product.
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DSH · Architecture
What Is DeepSeek Harness? Agent = Model + Harness Explained
DSH is the open pluginized layer that lets models act in real environments — not another chatbot brand.
Continue on the portal
Pair these articles with the install guide, tutorial track, FAQ, and community plugin directory for a full evaluation loop.