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Agent skill

Repo Harness Architecture

by Ancienttwo in Ancienttwo/repo-harness

Inspect or update an assigned architecture model, document, drift request, or Mermaid diagram.

MITAuto-check passedDevelopment

Install Repo Harness Architecture

skills CLI
$ npx skills add Ancienttwo/repo-harness --skill repo-harness-architecture -a claude-code

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

GitHub CLI
$ gh skill install Ancienttwo/repo-harness repo-harness-architecture --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/Ancienttwo/repo-harness.git skills-src && mkdir -p .claude/skills && cp -r skills-src/assets/skill-commands/repo-harness-architecture .claude/skills/repo-harness-architecture && 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
repo-harness-architecture
GitHub stars
434
Token cost
~217 tokens
SKILL.md length
80 words
Files
2 (incl. references)
Skills in repo
12
Repo updated
First seen
Licence
MIT

At a glance

Inspect or update an assigned architecture model, document, drift request, or Mermaid diagram.

  • Development work in your project
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Repo Harness Architecture is an agent skill from Ancienttwo/repo-harness. Inspect or update an assigned architecture model, document, drift request, or Mermaid diagram. Exclude unrelated code edits and full harness setup.

Its SKILL.md is about 220 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/worker.md`).

It sits in Development. It works with Mermaid. The repository describes itself as: File-backed workflow harness for reliable Claude Code and Codex sessions. The licence is MIT.

When your agent uses it

  • Development work in your project

Example prompts

  • “/repo-harness-architecture”

What it can do on your machine

Read from SKILL.md and the folder at commit 461e054. 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

    No scripts in the folder and no shell commands in SKILL.md.

    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 no API keys, tokens, secrets or passwords.

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

Context cost

Repo Harness Architecture loads about 217 tokens when it runs, and up to ~1.8k if it reads all its reference files. Until then it costs about 43 tokens; SKILL.md has 80 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~43
When it runs · the whole SKILL.md, loaded when a task matches
~217
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.8k

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 Ancienttwo/repo-harness at commit 461e054, republished under its MIT licence (© Ancienttwo). 80 words, ~217 tokens.

Download SKILL.mdSave it as .claude/skills/repo-harness-architecture/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
repo-harness-architecture
description
Inspect or update an assigned architecture model, document, drift request, or Mermaid diagram. Exclude unrelated code edits and full harness setup.
when_to_use
repo-harness-architecture

repo-harness-architecture

Worker entrypoint. Read the existing model and trace source responsibilities. Package layout and hook observations are inspection leads, not semantic authority. Keep intentional umbrella boundaries. Change the model only for a real responsibility change. Use references/worker.md for ChangeSet, projection, request archive and verification commands. Generated regions belong to archctx. Preserve human prose. Keep diagrams in Mermaid Markdown. Do not install tools, create approval records, or add capability nodes to satisfy an unrelated edit. Report ambiguous ownership or provider failure.

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

Files

SKILL.md and 1 other file (references) in assets/skill-commands/repo-harness-architecture of Ancienttwo/repo-harness.

  • SKILL.md
  • references/worker.md

Open the folder on GitHubat commit 461e054

Compare with similar skills

Repo Harness Architecture 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.

Repo Harness Architecture compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Repo Harness Architecture this skillAncienttwo/repo-harness434—~217Automated safety check: PassMIT
Archify Diagramstt-a1i/archify82k—~2.9kAutomated safety check: PassMIT
Diagram Designcathrynlavery/diagram-design49k1 repos~7.6kAutomated safety check: PassMIT
Draw.io Diagram StudioAgents365-ai/drawio-skill10k—~2.4kAutomated safety check: NotesMIT
Pretty Mermaid Rendererimxv/Pretty-mermaid-skills1.5k—~2kAutomated safety check: PassMIT
Archify Diagram BuilderUnclecheng-li/AI_Animation1.5k2 repos~4.1kAutomated safety check: PassMIT

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Works with

Categories

Questions about Repo Harness Architecture

What does Repo Harness Architecture do?

Inspect or update an assigned architecture model, document, drift request, or Mermaid diagram. Repo Harness Architecture is an agent skill from Ancienttwo/repo-harness. Inspect or update an assigned architecture model, document, drift request, or Mermaid diagram.

When should I use Repo Harness Architecture?

Repo Harness Architecture fits situations like: development work in your project.

How do I install Repo Harness Architecture in Claude Code?

Run `npx skills add Ancienttwo/repo-harness --skill repo-harness-architecture -a claude-code`. Or copy the skill folder (assets/skill-commands/repo-harness-architecture in Ancienttwo/repo-harness) into .claude/skills/repo-harness-architecture in your project. Claude Code loads it when a task matches its description.

How do I install Repo Harness Architecture in Codex?

Run `npx skills add Ancienttwo/repo-harness --skill repo-harness-architecture -a codex`. Or copy the skill folder (assets/skill-commands/repo-harness-architecture in Ancienttwo/repo-harness) into .agents/skills/repo-harness-architecture in your project. Codex loads it when a task matches its description.

Can I use Repo Harness Architecture 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 Ancienttwo/repo-harness --skill repo-harness-architecture -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/repo-harness-architecture, .gemini/skills/repo-harness-architecture, .github/skills/repo-harness-architecture and .opencode/skills/repo-harness-architecture in your project.

What does Repo Harness Architecture need to run?

SKILL.md names no scripts, command-line tools or credentials: Repo Harness Architecture is instructions for the agent only.

Does Repo Harness Architecture 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 Repo Harness Architecture 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 Repo Harness Architecture use?

Repo Harness Architecture 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 Repo Harness Architecture use?

About 217 tokens (SKILL.md is roughly 868 characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.6k tokens, read only when the agent opens those files.

What are the alternatives to Repo Harness Architecture?

Skills that share tags, products or a category with Repo Harness Architecture: Archify Diagrams (tt-a1i/archify, 82k stars), Diagram Design (cathrynlavery/diagram-design, 49k stars), Draw.io Diagram Studio (Agents365-ai/drawio-skill, 10k stars) and Pretty Mermaid Renderer (imxv/Pretty-mermaid-skills, 1.5k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Repo Harness Architecture?

Ancienttwo (a GitHub user) maintains it in Ancienttwo/repo-harness, which has 434 GitHub stars. The repository holds 12 skills in this directory. The repository was last updated on October 10, 2026.

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