# Spec First

> Write the goal spec on disk before the agent acts, so it can't drift. Use before any multi-step task.

- **Type:** Skill
- **Install:** `agentstack add skill-archive228-loopkit-spec-first`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [Archive228](https://agentstack.voostack.com/s/archive228)
- **Installs:** 0
- **Category:** [Agent Skills](https://agentstack.voostack.com/c/agent-skills)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [Archive228](https://github.com/Archive228)
- **Source:** https://github.com/Archive228/loopkit/tree/main/skills/spec-first

## Install

```sh
agentstack add skill-archive228-loopkit-spec-first
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# 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: ".
- **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.

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [Archive228](https://github.com/Archive228)
- **Source:** [Archive228/loopkit](https://github.com/Archive228/loopkit)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-archive228-loopkit-spec-first
- Seller: https://agentstack.voostack.com/s/archive228
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.