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Agent skill

Spec First

by Archive228 in Archive228/loopkit

Write the goal spec on disk before the agent acts, so it can't drift.

MITAuto-check passedDevelopment

Install Spec First

skills CLI
$ npx skills add Archive228/loopkit --skill spec-first -a claude-code

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

GitHub CLI
$ gh skill install Archive228/loopkit spec-first --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/Archive228/loopkit.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/spec-first .claude/skills/spec-first && 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
spec-first
GitHub stars
756
Token cost
~221 tokens
SKILL.md length
92 words
Files
1
Skills in repo
43
Repo updated
First seen
Licence
MIT

At a glance

Write the goal spec on disk before the agent acts, so it can't drift.

  • Tasks that involve Spec-driven development
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Spec First is an agent skill from Archive228/loopkit. Write the goal spec on disk before the agent acts, so it can't drift. Use before any multi-step task.

Its SKILL.md is about 220 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 Development, covering Spec-driven development. The repository describes itself as: 33 battle-tested skills + minimal .claude harness for any coding agent (Claude Code, Cursor, Codex, Gemini CLI). The licence is MIT.

When your agent uses it

  • Tasks that involve Spec-driven development

Example prompts

  • “/spec-first”

What it can do on your machine

Read from SKILL.md and the folder at commit 5ae033e. 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

Spec First loads about 221 tokens when it runs. Until then it costs about 28 tokens; SKILL.md has 92 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~28
When it runs · the whole SKILL.md, loaded when a task matches
~221

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 Archive228/loopkit at commit 5ae033e, republished under its MIT licence (© Archive228). 92 words, ~221 tokens.

Download SKILL.mdSave it as .claude/skills/spec-first/SKILL.md (or your agent's skills folder).
name
spec-first
description
Write the goal spec on disk before the agent acts, so it can't drift. Use before any multi-step task.
when_to_use
a task with more than 2 steps, a long-running job, "build X", agent drifting

Spec First

Without an external contract, the agent drifts after ~3 iterations — and the failure looks like progress (code written, tests pass, wrong goal solved). Write PROMPT.md BEFORE acting:

  • Goal — one sentence.
  • Done when — concrete, checkable conditions. "Test suite green: <cmd>".
  • Never touch — files/areas off-limits.
  • Stop if — more than N files outside scope change; a passing test starts failing. The agent re-reads this file every iteration. State (what's done) goes in a separate IMPLEMENTATION_PLAN.md it updates in place. If you can't write "done when" concretely, the task isn't ready — clarify before coding.

© Archive228, 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 skills/spec-first of Archive228/loopkit.

Open the folder on GitHubat commit 5ae033e

Compare with similar skills

Spec First 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.

Spec First compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Spec First this skillArchive228/loopkit756—~221Automated safety check: PassMIT
OpenSpec Bulk Change ArchiverFission-AI/OpenSpec71k3 repos~5.6kAutomated safety check: PassMIT
Speckit ConstitutionWeihanLi/WeihanLi.Common24211 repos~2.1kAutomated safety check: PassApache-2.0
Speckit Taskstoissueskunstmusik/blue15419 repos~2kAutomated safety check: PassGPL-3.0
Speckit Analyzekunstmusik/blue15418 repos~3kAutomated safety check: PassGPL-3.0
Review Spdzhu1090093659/spec_driven_develop984—~1.5kAutomated safety check: PassMIT

Similar skills

  • OpenSpec Bulk Change Archiver

    Fission-AI/OpenSpec

    Archives several completed OpenSpec changes in one operation, checking the codebase to resolve spec conflicts rather than archiving blindly.

    71k GitHub starsUsed in 3 repos~5.6k tokens
    DevelopmentAuto-check passed

  • Speckit Constitution

    WeihanLi/WeihanLi.Common

    Create or update the project constitution from interactive or provided principle inputs, ensuring all dependent templates stay in sync.

    242 GitHub starsUsed in 11 repos~2.1k tokens
    DevelopmentAuto-check passed

  • Speckit Taskstoissues

    kunstmusik/blue

    Convert existing tasks into actionable, dependency-ordered GitHub issues for the feature based on available design artifacts.

    154 GitHub starsUsed in 19 repos~2k tokens
    DevelopmentAuto-check passed

  • Speckit Analyze

    kunstmusik/blue

    Perform a non-destructive cross-artifact consistency and quality analysis across spec.md, plan.md, and tasks.md after task generation.

    154 GitHub starsUsed in 18 repos~3k tokens
    DevelopmentAuto-check passed

  • Review Spd

    zhu1090093659/spec_driven_develop

    Findings-first code review workflow for AI coding agents. An agent skill from zhu1090093659/spec_driven_develop.

    984 GitHub stars~1.5k tokensUpdated 2 mo ago
    DevelopmentAuto-check passed

  • Speckit Plan

    kunstmusik/blue

    Execute the implementation planning workflow using the plan template to generate design artifacts.

    154 GitHub starsUsed in 18 repos~2.1k tokens
    DevelopmentAuto-check passed

More from Archive228/loopkit

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  • Structured Output

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  • Using Loopkit

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    Auto-check passed

  • Active Memory Reminder

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    Auto-check passed

  • Eval Harness

    Archive228/loopkit

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  • Feature List JSON

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Categories

Questions about Spec First

What does Spec First do?

Write the goal spec on disk before the agent acts, so it can't drift. Spec First is an agent skill from Archive228/loopkit. Write the goal spec on disk before the agent acts, so it can't drift.

When should I use Spec First?

Spec First fits situations like: tasks that involve Spec-driven development.

How do I install Spec First in Claude Code?

Run `npx skills add Archive228/loopkit --skill spec-first -a claude-code`. Or copy the skill folder (skills/spec-first in Archive228/loopkit) into .claude/skills/spec-first in your project. Claude Code loads it when a task matches its description.

How do I install Spec First in Codex?

Run `npx skills add Archive228/loopkit --skill spec-first -a codex`. Or copy the skill folder (skills/spec-first in Archive228/loopkit) into .agents/skills/spec-first in your project. Codex loads it when a task matches its description.

Can I use Spec First 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 Archive228/loopkit --skill spec-first -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/spec-first, .gemini/skills/spec-first, .github/skills/spec-first and .opencode/skills/spec-first in your project.

What does Spec First need to run?

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

Does Spec First 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 Spec First 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 Spec First use?

Spec First 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 Spec First use?

About 221 tokens (SKILL.md is roughly 884 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 Spec First?

Skills that share tags, products or a category with Spec First: OpenSpec Bulk Change Archiver (Fission-AI/OpenSpec, 71k stars), Speckit Constitution (WeihanLi/WeihanLi.Common, 242 stars), Speckit Taskstoissues (kunstmusik/blue, 154 stars) and Speckit Analyze (kunstmusik/blue, 154 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Spec First?

Archive228 (a GitHub user) maintains it in Archive228/loopkit, which has 756 GitHub stars. The repository holds 43 skills in this directory. The repository was last updated on July 14, 2026.

Source: Archive228/loopkit on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.