Jev DSH Decision Engine

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Structured decision-making for Agent Harnesses.

Connect TypeSafe AI's Jev decision capability to your Agent: help select tools, Skills, and task owners, evaluate output quality, and return judgments and probabilities as structured results. Jev assists with decisions, while the original Agent continues to handle planning and execution.

Two installation entry points are provided: a DeepSeek Harness native plugin and an iPolloWork import plugin. Within iPolloWork it can be used by OpenCode, DeepSeek Harness, and Codex Harness. One shared decision core — no engine source code modifications, no takeover of the primary Agent.

Quick start: Install on DeepSeek Harness · Install on iPolloWork

Support and Integration

The current support for OpenCode and Codex Harness is via iPolloWork's integration method; this repository does not yet provide their individual standalone native install packages. Other Harnesses can build adapters based on the shared decision core, but that does not imply automatic compatibility.

Core Capabilities

• Recommends from currently available and authorized tools, Skills, and Agents for a task.
• Scores against explicit criteria; independent questions can be batched.
• Returns choice, probability, confidence, and usage; does not execute actions or auto-switch models or route requests.
• Local config checks and real connection tests. Connection tests incur a small TypeSafe API usage.

Jev is TypeSafe AI's structured decision model, not a chat model. The original Agent continues to handle planning, explanation, parameter construction, tool execution, and native sub-Agent collaboration. Jev does not return text reasoning processes; the Agent's explanations cannot masquerade as Jev's raw output.

Install on DeepSeek Harness

For users who use DSH directly. No need to install or run iPolloWork.

1. Install the Plugin

After installing DSH, clone this repo and install it via a local absolute path:

git clone https://github.com/Devin-AXIS/jev-dsh-decision.git
dsh plugin add /absolute/path/jev-dsh-decision

Replace /absolute/path/jev-dsh-decision with the actual absolute path of the cloned directory. The plugin uses the native dsh.bundle format; no source build required.

If you already have the .tgz install package, you can install it directly:

dsh plugin add /absolute/path/dsh-jev-decision-model-0.1.2.tgz

2. Configure Authorization

Configure your own TYPESAFE_API_KEY in DSH's credential management or startup environment. Do not write the key into plugin source code or chat logs. The plugin reuses DSH's credentials, tools, and skills services; the official default configuration provides these services, and custom configurations must retain them.

3. Verify and Use

Restart the running DSH session to apply the new configuration, then say in the chat:

Use Jev to check config first, then test the connection.

The plugin provides three tools: jev_status (local state), jev_check_connection (real connection test), and jev_evaluate (structured evaluation), along with the jev-decision Skill. Connection tests incur a small amount of TypeSafe API usage; a local "configured" display does not mean the key has been verified.

Uninstall

dsh plugin remove dsh-jev-decision-model

DSH credentials are held by the host. Uninstalling the plugin will not delete a shared TYPESAFE_API_KEY; remove it via DSH credential management or the environment when no longer needed. Restart running DSH sessions to load new plugin config.

Install into iPolloWork

For users of the Work GUI. Install once in Work to serve its supported OpenCode, DeepSeek Harness, and Codex Harness engines — no need to install three packages separately.

1. Import the package

Obtain the signed jev-decision-model-0.1.2.ipollowork-plugin package, select it under Extensions → Import plugin package, and confirm the publisher is iPolloWork. See "Development and Testing" below for how maintainers build the package.

When an older version is already installed, importing a new one upgrades while preserving the original plugin identity. The display name is "Jev DSH Decision Engine"; the internal plugin ID jev-decision-model and the DSH package name dsh-jev-decision-model remain unchanged.

Client requirement: a Work version that includes the ipollowork/ipollowork-2026 official signature public key registration. Older clients without this registration will reject the import; merely meeting the minimum version number in the manifest is not sufficient. Do not bypass signature verification.

2. Configure authorization

Open the authorization entry in the plugin details and enter your own TypeSafe API Key. The key is stored in Work's plugin authorization vault and does not need to be sent to the Agent in the conversation.

3. Verify and use

Enable "Jev DSH Decision Engine" in the conversation, then say:

Use Jev: check config first, then test the connection. Once it succeeds, pick a Skill suitable for the current task.

Work provides three actions: status, check-connection, and evaluate, all invoked through the existing extension interface. The "test connection" here sends a real request with a small amount of usage.

Uninstall

Remove it via Extensions → Jev DSH Decision Engine → Uninstall. Work cleans up the Skill, plugin content and dedicated auth along with the package; no global scripts or daemons are installed. Uninstalling does not delete your TypeSafe cloud account.

Examples

• "Use Jev to determine which installed Skills this task needs, then execute it."
• "From the currently available Agents, pick the one best suited to lead competitor analysis."
• "Assess this output for accuracy, completeness, and clarity; hand the uncertain parts to me to confirm."

Recommendations are not execution authorization; external actions still follow Harness permissions.

{
  "state": { "task": "为已收集的竞品资料制作汇报", "available": ["research", "slides"] },
  "questions": {
    "owner": {
      "type": "choice",
      "instructions": "哪个已提供的 Agent 最适合负责最终交付？",
      "criteria": { "research": "负责资料分析", "slides": "负责演示文稿" }
    },
    "need_review": { "type": "noul", "instructions": "这个任务是否需要审稿？" },
    "clarity": { "type": "score", "instructions": "任务要求是否清楚？", "criteria": ["不明确", "部分明确", "明确"] }
  }
}

pnpm install --frozen-lockfile
pnpm test
DSH_RUNTIME_ROOT=/path/to/dsh-runtime pnpm test:dsh
pnpm package:dsh
DSH_RUNTIME_ROOT=/path/to/dsh-runtime DSH_CLI_TEST=1 pnpm test:dsh

IPOLLOWORK_PLUGIN_SIGNING_KEY=/secure/path/ipollowork-ed25519.pem \
IPOLLOWORK_PLUGIN_KEY_ID=ipollowork-2026 pnpm package:work
IPOLLOWORK_ROOT=/path/to/updated/iPolloWork pnpm test:work
pnpm package:dsh

MCowBQYDK2VwAyEAoHA9xxXNZPQ7y+AKpDBIXruNvwVasq7axjilzIY6RDE=

Sources and Identity

• TypeSafe AI Official API Documentation
• DSH Official Plugin Development Documentation
• The icon is taken as-is from the black icon on transparent background in TypeSafe's official documentation; it is embedded in the installer for offline display, and the pink version is not used. Icon and brand rights belong to the original owner.

This project is maintained and released by iPolloWork. Jev belongs to TypeSafe AI; this project does not imply official endorsement by TypeSafe AI, DeepSeek, or any other Harness project.