How do I install design-harness?

Run these in Claude Code: /plugin marketplace add tigerless-labs/design-harness then /plugin install design-harness@design-harness. Then prompt normally.

Does design-harness auto-invoke its skills?

Not yet. It is indexed on Flowy as a plain plugin. Request auto-invocation on its page and Flowy will route its skills for you as you prompt.

Is design-harness free?

Yes. Flowy is free and open source, with nothing gated. You can read every skill in full before you install.

Documentation

Plugin

design-harness

Feed your agent papers and half-formed ideas — it links them into a system design you can defend. Markdown keeps the record; a visual canvas makes it readable. An Agent Skill for Claude Code & any SKILL.md-compatible agent.

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tigerless-labs@tigerless-labs

GitHub

Plugin Signal64/100Solid

maintained91

capable14

documented100

adopted50

Install on Claude Code

> /plugin marketplace add tigerless-labs/design-harness
> /plugin install design-harness@design-harness

Stats

Python HTML Bash Git GitHub

+2 tags

Markdown Anthropic

223

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Forks

Active

Maintenance

Python

Language

20d ago

Last commit

2mo ago

Created

Repo: tigerless-labs/design-harness

In this plugin

1 skill

- design-harness

See everything inside

What's inside

Skill(1 skill)

/design-harnessA decision board for evidence-based calls — the human adjudicates, the agent runs the errands. Three layers (sources → ideas → output) in plain markdown, synced on the human's command, projected onto a visual canvas. Use for vendor/tool selection, literature reviews, due

README

Read on GitHub

Turn scattered reading and half-formed ideas into a design you can defend — a skill, a system, a video script, even the structure of an article. The human adjudicates, the agent runs the errands.

An Agent Skill (Claude Code plugin, works with any SKILL.md-compatible agent): feed it sources and rough ideas as you go — it files and links them, records how your thinking evolves, and assembles the evidence into a system design.

Markdown keeps the record; the canvas makes it readable — every source and idea you add lands on the board, one glance away from any decision's why.

What This Does

Sources file themselves — drop papers, repos, blog posts; the agent files one card per source, grades it, and anchors every claim to where it came from.
Ideas are yours alone — only a human creates an idea card; the agent links it to evidence, clusters neighbors, and surfaces conflicts instead of picking a side.
Output assembles on your word — one command turns surviving ideas into the deliverable, and every later sync runs on your word too; edit output directly and it flows back into ideas.
Everything is traceable — every design element links back through ideas to the sources that earned it, with an append-only log on every card.
Plain Markdown, no lock-in — three folders in your repo; versionable, greppable, renders on GitHub. The agent is just the runtime.
One visual canvas — a self-contained HTML projection of the whole board: no server, no dependencies, rebuilt from the markdown on demand. Commit it, and whoever gets the repo gets the board.

Installation

Claude Code:

/plugin marketplace add tigerless-labs/design-harness
/plugin install design-harness@design-harness

Codex (CLI and the ChatGPT desktop app share one plugin system):

codex plugin marketplace add tigerless-labs/design-harness

then install from /plugins in the CLI or the desktop app's plugin directory.

For other SKILL.md-compatible agents, copy the skill folder into your agent's skill directory:

git clone https://github.com/tigerless-labs/design-harness
cp -r design-harness/plugins/design-harness/skills/design-harness \
  ~/.claude/skills/

Updating

Claude Code — refresh the marketplace, then update the plugin:

/plugin marketplace update design-harness
/plugin update design-harness@design-harness

(Or enable auto-update for this marketplace under /plugin → Marketplaces.)

Codex — refresh the marketplace snapshot, then update from /plugins:

codex plugin marketplace upgrade

Manual copy — git pull the clone and re-run the cp -r above.

Usage

Talk to your agent in plain language:

> file these papers onto the board

> assemble the design

Drop material — the agent files and grades each source as a card.
Think out loud — your judgments land as idea cards, linked to their evidence.
Say go — the ideas assemble into the output your target.md declares.
Ask for the canvas — the agent builds the board and hands you a clickable link.

Render your own workspace in ten seconds — the demo board is the same projection run on a real workspace:

python3 plugins/design-harness/skills/design-harness/scripts/build_canvas.py \
  path/to/your-workspace -o /tmp/canvas
open /tmp/canvas/canvas.html

Share the Why

The board is not just where you think — it's how you show someone else why the design is what it is. The canvas is one self-contained HTML file, so commit it beside your workspace:

python3 plugins/design-harness/skills/design-harness/scripts/build_canvas.py \
  path/to/your-workspace -o docs
git add docs/canvas.html

Whoever gets the repo opens one file and gets the whole board — every card one click from the evidence that earned it. Want a URL instead? Serve the same file with hosted pages, the way this repo does.

Canvas Styles

Five skins ship with the canvas; switch live from the toolbar, Pin & Paper is the default. Screenshots below are this repo's own workspace, unretouched — the board view and a close-up for each style.

Pin & Paper (default)

A handmade pinboard: yellow paper ground, ink-blue hand script, pinned notes, taped slips, and dashed hand-drawn threads between them.

Notebook Tabs

Warm ivory stationery: serif italic headings, index cards with colored tab tongues, sticky-note ideas, stitched dashed connections.

Swiss Modern

White, ink, and one red accent: hairline grid, giant grotesk world titles with red ordinals, ruler-straight edges.

BlockFrame

Neo-brutalist pastel decks: thick borders, hard offset shadows, cyan / pink / yellow card blocks that tilt just enough to feel alive.

8-Bit Orbit

A CRT arcade in deep navy — scanlines, neon cyan / yellow / magenta frames, and orthogonal circuit-trace edges. Dark in both color schemes; a CRT has no daylight mode.

Philosophy

The human adjudicates, the agent runs the errands — agents execute well and judge poorly, and a wrong design costs the whole branch of code built on it.
Markdown is the only source of truth — every other surface, the canvas included, is a projection: rebuilt wholesale from the markdown, committed and shared or thrown away, never the place facts live.
Rejected ideas are archived with their reasons, never deleted — six months later, "why didn't we do X?" has an answer.
Every element of the output must answer "why?" with a link.

This repo is dogfooded on itself: its own design was produced by running the method on ~80 sources about decision-making methods.

License

MIT — vendored renderers (marked, DOMPurify) keep their original headers.

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FAQ

design-harness is a Claude Code plugin with 1 hand-picked skill for documentation work, indexed on Flowy. Install it with the command on its page. It includes design-harness. Its skills do not fire on their own yet. Request auto-invocation to have Flowy route them as you prompt. Free and open source.

What is design-harness?: Feed your agent papers and half-formed ideas — it links them into a system design you can defend. Markdown keeps the record; a visual canvas makes it readable. An Agent Skill for Claude Code & any SKILL.md-compatible agent.
How do I install design-harness?: Run these in Claude Code: /plugin marketplace add tigerless-labs/design-harness then /plugin install design-harness@design-harness. Then prompt normally.
Does design-harness auto-invoke its skills?: Not yet. It is indexed on Flowy as a plain plugin. Request auto-invocation on its page and Flowy will route its skills for you as you prompt.
Is design-harness free?: Yes. Flowy is free and open source, with nothing gated. You can read every skill in full before you install.

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