JEV decision mode for DeepSeek Harness Desktop

中文说明 · Installation · Validation and measurements · Releases

An optional preset that combines the standard Desktop tool capabilities with deterministic project reads, bounded JEV semantic selection, and a separate authorization gate. Independently developed and maintained by QI-seven33; this is an unofficial community plugin.

Install

In Harness Desktop, open Plugins, install and enable:

github:QI-seven33/dsh-jev-mode#v0.4.2

Alternatively, download dsh-jev-mode-0.4.2.tgz and enter its absolute local path in the same installer. Restart Harness completely, then choose JEV decision mode in a new session. Cloning the repository alone does not activate the plugin.

Tested against DeepSeek Harness Desktop 0.2.0-rc.2. Other host versions and operating systems need separate validation. Ready-to-run JavaScript is included; there are no runtime dependencies or build/install lifecycle scripts.

Enter your own key

Open Settings → Models → JEV decision model → Edit. Enter your personal TypeSafe API key and save. The plugin uses Harness's write-only credentials service under TYPESAFE_API_KEY. No shared key is included, and saved values are never returned to the browser or model conversation. Keep your existing DeepSeek main-model configuration.

The collapsed card opens the host modal on Edit. It supports save, replacement, removal and status refresh. The dot indicates a configured credential, not API connectivity. Environment-provided credentials are read-only; removing a stored key can expose an existing .env fallback.

These images are component-test previews using the actual host React/Modal with a stubbed credentials remote; they do not depict a live authenticated Desktop session.

What the mode does

Task	Behavior
Explicit root package.json / README.md query	Code chooses the file; native read and permissions run; zero JEV selection calls.
Eligible short contrastive request, both fixed files available	JEV may select one fixed read. Valid confidence and selected probability must both reach 0.9; otherwise ordinary planning continues.
Risky operation	Hard rules run first. Risk 2+ operations use real human instruction history for semantic authorization. Host permission vetoes remain authoritative.
Ordinary code or document task	Standard planning and tools; no automatic advisory JEV calls. Quoted commands in document content are not treated as executions.

Without a TypeSafe key, explicit reads still work, semantic reads fall back, and failed dangerous authorization checks escalate or deny. Manual jev_decide and jev_gate tools remain available for human-requested diagnostics; jev_status reports version and counters.

The system prompt section and complete tool catalog remain fixed within a session. Runtime notices append after retained history using the host's producer-owned V4 message contract. Dynamic tool pruning and status-prefix rewrites are avoided to preserve DeepSeek prefix reuse. Cache hits remain best-effort and are not guaranteed. The ledger stores metadata and hashes, not command bodies, reasons or credentials.

Evidence and limits

The decision implementation is unchanged from 0.4.0; 0.4.2 adds desktop credential UI and separates global settings from preset behavior. The earlier controlled standard-vs-hybrid comparison achieved 28/28 scripted task successes in both arms and fewer main-model requests, but JEV-mode P95 was worse. These are small local measurements, not universal speed or accuracy claims. See VALIDATION.md for exact scope.

Authorization thresholds 0.85 / 0.55 have not been calibrated for this domain. Real-world false-allow/false-block rates are unmeasured. An automatic grounded/sufficient verification loop and per-decision client badges are not shipped.

Development

npm install --no-save --no-package-lock yaml@2
npm test

Native-host checks require Node 24 and the host module locations via DSH_HOST_NODE_MODULES / DSH_HOST_NATIVE_NODE_MODULES. CI runs offline checks on Node 20, 22 and 24 and explicitly reports absent-host skips. Live benchmark scripts are opt-in; see bench/COMPARE.md. Do not commit credentials, profiles or raw conversation traces.

Acceptance steps · Source attribution · Release procedure

MIT License · Copyright 2026 QI-seven33.