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Agent skill

Aceharness Spec Coding

by TheAceTeam in TheAceTeam/AceHarness

ACEHarness Spec Coding skill for generating, reviewing, revising, and executing spec-first requirements/design/tasks artifacts tied to workflow steps.

Custom licenceAuto-check passedDevelopment

Install Aceharness Spec Coding

skills CLI
$ npx skills add TheAceTeam/AceHarness --skill aceharness-spec-coding -a claude-code

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

GitHub CLI
$ gh skill install TheAceTeam/AceHarness aceharness-spec-coding --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/TheAceTeam/AceHarness.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/aceharness-spec-coding .claude/skills/aceharness-spec-coding && 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
aceharness-spec-coding
GitHub stars
105
Token cost
~2.7k tokens
SKILL.md length
1,206 words
Files
7
Skills in repo
8
Repo updated
First seen
Licence
Custom licence

At a glance

ACEHarness Spec Coding skill for generating, reviewing, revising, and executing spec-first requirements/design/tasks artifacts tied to workflow steps.

  • Works in 8 steps: Build an analysis packet before writing… → Split the work into capabilities. A… → Derive requirements from the analysis… → …
  • Turning rough workflow requirements into actionable requirements.md
  • SKILL.md covers Positive Example, Evidence-First Rule, Artifact Boundary and Generation Procedure, plus 6 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Aceharness Spec Coding is an agent skill from TheAceTeam/AceHarness. ACEHarness Spec Coding skill for generating, reviewing, revising, and executing spec-first requirements/design/tasks artifacts tied to workflow steps. Use when turning rough workflow requirements into actionable requirements.md, design.md, tasks.md, when revising AI-generated specs, or when keeping SpecCoding artifacts aligned with workflow execution.

Its SKILL.md is about 2.7k tokens, which your agent loads only when the skill is triggered. The skill folder holds 8 other files (for example `PROMPT.md`, `examples/executable-spec.md` and `templates/checklist.md`).

It sits in Development, covering Design tokens and Spec-driven development.

When your agent uses it

  • Turning rough workflow requirements into actionable requirements.md
  • Revising AI-generated specs
  • Keeping SpecCoding artifacts aligned with workflow execution

Example prompts

  • “/aceharness-spec-coding”

Workflow steps

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

  1. Build an analysis packet before writing final artifacts
  2. Split the work into capabilities. A capability is a behavior or workflow outcome that can be tested independently.
  3. Derive requirements from the analysis packet, not from section titles. Each R must answer
  4. Assign stable IDs
  5. Write requirements first. Each requirement must include
  6. Write design from the requirements and code evidence. Include
  7. Write tasks from requirements and design. Every executable leaf task must include
  8. Self-check before returning

What it can do on your machine

Read from SKILL.md and the folder at commit 7122bf6. 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 (its code samples are markdown and json).

    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

Aceharness Spec Coding loads about 2.7k tokens when it runs. Until then it costs about 94 tokens; SKILL.md has 1,206 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~94
When it runs · the whole SKILL.md, loaded when a task matches
~2.7k

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

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 1,206 words (~2,704 tokens).

“Turn rough workflow intent into three executable planning artifacts:”

— opening of SKILL.md by TheAceTeam, Custom licence
name
aceharness-spec-coding

Read the full SKILL.md on GitHub

Files

SKILL.md and 6 other files in skills/aceharness-spec-coding of TheAceTeam/AceHarness.

  • SKILL.md
  • PROMPT.md
  • examples/executable-spec.md
  • templates/checklist.md
  • templates/design.md
  • templates/requirements.md
  • templates/tasks.md

Open the folder on GitHubat commit 7122bf6

Compare with similar skills

Aceharness Spec Coding 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.

Aceharness Spec Coding compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Aceharness Spec Coding this skillTheAceTeam/AceHarness105—~2.7kAutomated safety check: PassCustom licence
Spec Driven DevelopmentFredAntB/Spec-Driven-Development153—~5.4kAutomated safety check: PassMIT
Oft Spec Driven Developmentitsallcode/openfasttrace197—~2kAutomated safety check: PassGPL-3.0
Design TrackerDeL-TaiseiOzaki/claude-code-orchestra199—~2kAutomated safety check: PassMIT
Verifying Modulestelagod/code-abyss243—~431Automated safety check: NotesMIT
Yoga Go Desktop UIchapar-rest/chapar715—~2.8kAutomated safety check: PassBSD-3-Clause

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Categories

Questions about Aceharness Spec Coding

What does Aceharness Spec Coding do?

ACEHarness Spec Coding skill for generating, reviewing, revising, and executing spec-first requirements/design/tasks artifacts tied to workflow steps. Aceharness Spec Coding is an agent skill from TheAceTeam/AceHarness. ACEHarness Spec Coding skill for generating, reviewing, revising, and executing spec-first requirements/design/tasks artifacts tied to workflow steps.

When should I use Aceharness Spec Coding?

Aceharness Spec Coding fits situations like: turning rough workflow requirements into actionable requirements.md; revising AI-generated specs; keeping SpecCoding artifacts aligned with workflow execution.

How do I install Aceharness Spec Coding in Claude Code?

Run `npx skills add TheAceTeam/AceHarness --skill aceharness-spec-coding -a claude-code`. Or copy the skill folder (skills/aceharness-spec-coding in TheAceTeam/AceHarness) into .claude/skills/aceharness-spec-coding in your project. Claude Code loads it when a task matches its description.

How do I install Aceharness Spec Coding in Codex?

Run `npx skills add TheAceTeam/AceHarness --skill aceharness-spec-coding -a codex`. Or copy the skill folder (skills/aceharness-spec-coding in TheAceTeam/AceHarness) into .agents/skills/aceharness-spec-coding in your project. Codex loads it when a task matches its description.

Can I use Aceharness Spec Coding 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 TheAceTeam/AceHarness --skill aceharness-spec-coding -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/aceharness-spec-coding, .gemini/skills/aceharness-spec-coding, .github/skills/aceharness-spec-coding and .opencode/skills/aceharness-spec-coding in your project.

What does Aceharness Spec Coding need to run?

SKILL.md names no scripts, command-line tools or credentials: Aceharness Spec Coding is instructions for the agent only.

Does Aceharness Spec Coding 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 Aceharness Spec Coding 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 Aceharness Spec Coding use?

Aceharness Spec Coding has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Aceharness Spec Coding use?

About 2.7k tokens (SKILL.md is roughly 11k 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 Aceharness Spec Coding?

Skills that share tags, products or a category with Aceharness Spec Coding: Spec Driven Development (FredAntB/Spec-Driven-Development, 153 stars), Oft Spec Driven Development (itsallcode/openfasttrace, 197 stars), Design Tracker (DeL-TaiseiOzaki/claude-code-orchestra, 199 stars) and Verifying Modules (telagod/code-abyss, 243 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Aceharness Spec Coding?

TheAceTeam (a GitHub organization) maintains it in TheAceTeam/AceHarness, which has 105 GitHub stars. The repository holds 8 skills in this directory. The repository was last updated on September 3, 2026.

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