Design Harness plugin for Codex
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 to install Design Harness in Codex
1. Add the repo as a Codex plugin marketplace:
codex plugin marketplace add tigerless-labs/design-harness2. Install the plugin from it:
codex plugin add design-harness@design-harnessThis repo ships a Codex marketplace file (.agents/plugins/marketplace.json). The first command adds it as a marketplace (Codex CLI reference); the second installs the plugin 'design-harness'. 'design-harness' is the marketplace name from that file. Check the repo README too. Command format: Codex CLI reference.
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What it contains
Plugins in this marketplace (1)
design-harness— Step one of vibe coding — turn scattered reading and half-formed ideas into a design you can defend. Three markdown layers (sources → ideas → output) synced on the human's command on a visual canvas; the human adjudicates, the agent runs errands.
About this listing
Design Harness is a community plugin on GitHub by tigerless-labs. Its README documents a Codex install and the repo ships a Codex plugin manifest. It passed the CodexStacks quality filter for repos found this way (at least 100 stars, pushed in the last 90 days, not a fork or a list). OpenAI hasn't reviewed it, but it passed our Codex install check on Oct 29, 2026 (an install and load check, not a code review). From its files we found 1 plugin. It's one of 311 listings in the Productivity category. It also appears in best Codex plugins for design and UI, best Codex plugins for research.
Design Harness FAQ
How do I install Design Harness in Codex?
Add the repo as a Codex plugin marketplace with codex plugin marketplace add tigerless-labs/design-harness, then install it with codex plugin add design-harness@design-harness. Commands: the command format from the Codex CLI reference; check the repo README too.
Is Design Harness an official Codex plugin?
No. Design Harness is a community repo on GitHub by tigerless-labs. It passed the CodexStacks quality filter, but OpenAI hasn't reviewed it, but it passed our Codex install check on Oct 29, 2026 (an install and load check, not a code review), so read the code before you install it.
What does Design Harness include?
From its manifest and repo files, Design Harness includes 1 plugin: design-harness.
Details
- Type
- Plugin
- Category
- Productivity
- Source
- Community
- Author
- tigerless-labs
- GitHub stars
- 234 (at last sync)
- Last push
- 2026-09-01
- Manifest
.agents/plugins/marketplace.json- GitHub topics
- agent-skills, ai-agents, claude-code, claude-code-plugin, decision-support, evidence-based, knowledge-management, literature-review, markdown, provenance, research-tools
- Source
- https://github.com/tigerless-labs/design-harness
- Listed via
- GitHub search: README documents a Codex install
- Install check by CodexStacks
- Passed on Oct 29, 2026 with Codex CLI 0.163.0: Codex loaded its skills. proof · how we check
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For maintainers: badge and embeds
Maintain Design Harness? Add the badge; it links to this page.
Markdown
[](https://codexstacks.com/p/design-harness/)HTML
<a href="https://codexstacks.com/p/design-harness/"><img src="https://codexstacks.com/badge.svg" alt="Listed on CodexStacks" width="172" height="28"></a>Embed card (static HTML and inline CSS, no JavaScript). Preview:
<a href="https://codexstacks.com/p/design-harness/" style="display:block;max-width:380px;box-sizing:border-box;padding:14px 16px;border:1px solid #3a2c26;border-radius:12px;background:#0d0b0a;color:#f3ece6;font:14px/1.45 -apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;text-decoration:none"><span style="display:block;font-size:16px;font-weight:700;color:#f3ece6">Design Harness</span><span style="display:block;margin:2px 0 8px;font-size:12px;color:#b5a9a1">Community Codex plugin · 1 plugin</span><span style="display:block;margin:0 0 10px;color:#ddd3cc">Feed your agent papers and half-formed ideas — it links them into a system design you can defend. Markdown keeps the…</span><span style="font-size:12px;font-weight:600;color:#ffb347">View on CodexStacks →</span></a>Markdown summary
**[Design Harness on CodexStacks](https://codexstacks.com/p/design-harness/)**: Community Codex plugin with 1 plugin.More on badges, embeds and keeping your listing up to date: CodexStacks for plugin authors.
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