Agent skill

Jev Trader

by autonomous-ai in autonomous-ai/openharness

Design and verify Jev's paper-trading desks in OpenHarness's viewer, where Jev trades a synthetic market live.

MITAuto-check passedBusiness, Finance & HR

Install Jev Trader

skills CLI
$ npx skills add autonomous-ai/openharness --skill jev-trader -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install autonomous-ai/openharness jev-trader --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/autonomous-ai/openharness.git skills-src && mkdir -p .claude/skills && cp -r skills-src/store/agents/jev-trader/skills/trader .claude/skills/jev-trader && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
jev-trader
GitHub stars
1.2k
Token cost
~630 tokens
SKILL.md length
272 words
Files
1
Skills in repo
99
Repo updated
First seen
Licence
MIT

At a glance

Design and verify Jev's paper-trading desks in OpenHarness's viewer, where Jev trades a synthetic market live.

  • Works in 3 steps: Update market.json (instrument,… → node "$JEV_DSH/toolchain/check.mjs"… → Watch the equity curve against…
  • Tasks that involve Trading and backtesting
  • SKILL.md covers The loop, Reading Jev, Verifying a desk and Driving Jev yourself
  • Calls node; needs TYPESAFE_API_KEY

What it does

Jev Trader is an agent skill from autonomous-ai/openharness. Design and verify Jev's paper-trading desks in OpenHarness's viewer, where Jev trades a synthetic market live.

Its SKILL.md is about 630 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Business, Finance & HR, covering Trading and backtesting. The repository describes itself as: The ultimate harness for coding agents and beyond. All your agents. All your machines. One command center. Start with code, then follow your curiosity and build across… The licence is MIT.

When your agent uses it

  • Tasks that involve Trading and backtesting

Example prompts

  • “s paper-trading desks in OpenHarness”
  • “/jev-trader”

Requirements

  • A credential in TYPESAFE_API_KEY

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

  1. Update market.json (instrument, volatility, trend, drift, fee, style). The viewer watches it and
  2. node "$JEV_DSH/toolchain/check.mjs" verifies the workspace's market.json is valid and
  3. Watch the equity curve against buy-and-hold and the "right side of the trend" gauge. Does Jev

What it can do on your machine

Read from SKILL.md and the folder at commit 74c2733. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • node

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names these keys or tokens, usually read from environment variables:

    • TYPESAFE_API_KEY

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Jev Trader loads about 630 tokens when it runs. Until then it costs about 30 tokens; SKILL.md has 272 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~30
When it runs · the whole SKILL.md, loaded when a task matches
~630

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from autonomous-ai/openharness at commit 74c2733, republished under its MIT licence (© autonomous-ai). 272 words, ~630 tokens.

Download SKILL.mdSave it as .claude/skills/jev-trader/SKILL.md (or your agent's skills folder).
name
jev-trader
description
Design and verify Jev's paper-trading desks in OpenHarness's viewer, where Jev trades a synthetic market live.

Jev Trader market design

Jev Trader shows a live paper-trading desk: Jev (TypeSafe's System One model) reads a synthetic price tape + its own P&L and decides buy / hold / sell each tick. The agent designs market.json — the market Jev trades and the style brief it follows.

The loop

  1. Update market.json (instrument, volatility, trend, drift, fee, style). The viewer watches it and reframes Jev live — no restart, no second server. Changing startPrice, capital, seed or episodeDays restarts the paper year.
  2. node "$JEV_DSH/toolchain/check.mjs" verifies the workspace's market.json is valid and reports the verdict. Run it before you call a desk done.
  3. Watch the equity curve against buy-and-hold and the "right side of the trend" gauge. Does Jev make coherent policy on your market — buy the trend, cut the losses — or just churn? That observation is the finding. .harness/verdict.json carries the same numbers.

Reading Jev

The viewer shows Jev's last action (BUY/HOLD/SELL), shares, equity and confidence. A good desk produces policy: Jev should react to the tape you gave it, not move the same way regardless of your market. A decisive style brief + a real trend yields readable behavior; a flat, driftless market makes any movement look like noise.

Verifying a desk

node "$JEV_DSH/toolchain/check.mjs" returns non-zero when market.json is invalid (bad price, ms, capital). It doesn't replace watching the curve: confirm the market ticks, Jev's equity moves, and its actions vary with the market rather than blindly holding.

Driving Jev yourself

toolchain/jev.mjs exports a small client. Example (from the workspace) — ask Jev's read on a market before you commit:

bash
node --input-type=module -e '
import { evaluate, jev } from "$JEV_DSH/toolchain/jev.mjs";
const res = await evaluate({
  state: "Market: SYNTH, per-step volatility 0.05 with a strong upward drift. Would a momentum Jev be profitable with a buy-the-trend style?",
  questions: {
    edge: jev.noul("Is there a tradable edge here for a momentum trader?"),
    churn: jev.score({0:"no",1:"some",2:"a lot"}, "How much would this market cause needless overtrading?"),
  },
});
console.log(JSON.stringify(res.answers, null, 2));
'

Without TYPESAFE_API_KEY this uses the deterministic mock; set the key to hit live Jev.

© autonomous-ai, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in store/agents/jev-trader/skills/trader of autonomous-ai/openharness.

Open the folder on GitHubat commit 74c2733

Compare with similar skills

Jev Trader next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Jev Trader compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Jev Trader this skillautonomous-ai/openharness1.2k—~630Automated safety check: PassMIT
Tushare Datazillionare/zillionare3212 repos~2.3kAutomated safety check: PassNone
Tradingview MCPatilaahmettaner/tradingview-mcp5k—~1.3kAutomated safety check: PassMIT
Digital Oraclekomako-workshop/digital-oracle875—~5.9kAutomated safety check: PassMIT
Polyclawchainstacklabs/polyclaw3591 repos~2kAutomated safety check: PassApache-2.0
Markdownfacioquo/stock-indicators-dotnet1.2k—~812Automated safety check: PassApache-2.0

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Questions about Jev Trader

What does Jev Trader do?

Design and verify Jev's paper-trading desks in OpenHarness's viewer, where Jev trades a synthetic market live. Jev Trader is an agent skill from autonomous-ai/openharness. Design and verify Jev's paper-trading desks in OpenHarness's viewer, where Jev trades a synthetic market live.

When should I use Jev Trader?

Jev Trader fits situations like: tasks that involve Trading and backtesting.

How do I install Jev Trader in Claude Code?

Run `npx skills add autonomous-ai/openharness --skill jev-trader -a claude-code`. Or copy the skill folder (store/agents/jev-trader/skills/trader in autonomous-ai/openharness) into .claude/skills/jev-trader in your project. Claude Code loads it when a task matches its description.

How do I install Jev Trader in Codex?

Run `npx skills add autonomous-ai/openharness --skill jev-trader -a codex`. Or copy the skill folder (store/agents/jev-trader/skills/trader in autonomous-ai/openharness) into .agents/skills/jev-trader in your project. Codex loads it when a task matches its description.

Can I use Jev Trader in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add autonomous-ai/openharness --skill jev-trader -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/jev-trader, .gemini/skills/jev-trader, .github/skills/jev-trader and .opencode/skills/jev-trader in your project.

What does Jev Trader need to run?

Going by SKILL.md and its folder, Jev Trader needs the command-line tools its instructions call (node) and credentials named TYPESAFE_API_KEY. Our summary lists: A credential in TYPESAFE_API_KEY.

Does Jev Trader access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Jev Trader safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Jev Trader use?

Jev Trader is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Jev Trader use?

About 630 tokens (SKILL.md is roughly 2.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Jev Trader?

Skills that share tags, products or a category with Jev Trader: Tushare Data (zillionare/zillionare, 321 stars), Tradingview MCP (atilaahmettaner/tradingview-mcp, 5k stars), Digital Oracle (komako-workshop/digital-oracle, 875 stars) and Polyclaw (chainstacklabs/polyclaw, 359 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Jev Trader?

autonomous-ai (a GitHub organization) maintains it in autonomous-ai/openharness, which has 1,194 GitHub stars. The repository holds 99 skills in this directory. The repository was last updated on October 9, 2026.

Source: autonomous-ai/openharness on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.