---
skill_id: spec-driven-development
evaluation: free
price_usd_full: 6.99
challenge: https://lvlltd.com/api/pay?skill=spec-driven-development
outline: https://lvlltd.com/skills/spec-driven-development/outline.json
standards: x402, ERC-7857
---

# Free sample — Spec Driven Development

**Skill ID:** `spec-driven-development`  
**Full unlock:** $6.99 USDC via x402 on Base  
**Challenge:** https://lvlltd.com/api/pay?skill=spec-driven-development  
**Outline JSON:** https://lvlltd.com/skills/spec-driven-development/outline.json

## Summary

Spec-driven development discipline: write executable acceptance criteria, implement to the spec only, and ship with evidence that criteria passed.

## When to use

- Ambiguous tickets
- Agent scope creep
- Need acceptance evidence

## Decision criteria (buy vs skip)

- You need this when: Ambiguous tickets
- You get capability: Draft executable spec
- Budget fits: full unlock is $6.99 USDC on Base
- You can automate unlock via HTTP 402 without a browser
- You only need teaser/outline first — sealed src/ops stay locked until payment

## Outline (preview)

1. Draft executable spec
2. Confirm non-goals
3. Derive tests
4. Implement
5. Evidence pack

## Capabilities (preview)

- Draft executable spec
- Confirm non-goals
- Derive tests
- Implement
- Evidence pack

## What you get after payment

- SKILL.md (teaser public)
- agent-install.json (public meta)
- src/index.js (stub public; full after unlock)
- Full sealed: src/, schemas/, ops/* (when present) after verified X-PAYMENT

## Agent buy path (zero human UI)

```
GET  https://lvlltd.com/skills/spec-driven-development/outline.json
GET  https://lvlltd.com/api/pay?skill=spec-driven-development   → HTTP 402
# transfer maxAmountRequired USDC to payTo on Base
POST https://lvlltd.com/api/pay
  X-PAYMENT: {"txHash":"0x…","skill":"spec-driven-development"}
# response.sealed_pack.files = full pack
```

## Sample excerpt

# Spec Driven Development

**Price:** $6.99 / unlock
**Category:** Coding

## Summary

Spec-driven development discipline: write executable acceptance criteria, implement to the spec only, and ship with evidence that criteria passed.

---

---
name: spec-driven-development
description: Run spec-driven development loops that lock acceptance criteria before implementation and evidence after. Use when spec driven development, SDD, executable specs, acceptance criteria first, or /spec-driven-development.
---

# Spec Driven Development

Spec-driven development discipline: write executable acceptance criteria, implement to the spec only, and ship with evidence that criteria passed.

## Quick Reference
| Item | Value |
|------|-------|
| Category | Coding |
| Unlock | $6.99 USDC (x402 Base) |
| Triggers | spec driven development, SDD, executable specs, /spec-driven-development |

## When to use
- Ambiguous tickets
- Agent scope creep
- Need acceptance evidence

## Core workflow
1. Clarify goal and non-goals
2. Write acceptance cases
3. Implement minimal
4. Prove criteria
5. Archive evidence

## Procedures (non-obvious)
If a request is not in the spec it is out of scope until the spec is updated.
Prefer Given/When/Then or checklists with measurable outcomes.

## Edge cases
- Changing product mid-flight updates spec first
- External constraints noted as assumptions

## Failure modes
- Coding before criteria
- Criteria not measurable

## Verification
- All acceptance cases pass
- No out-of-scope files in diff

## Artifact outputs
- `spec.md`
- `acceptance-cases.md`
- `evidence.md`

## Related skills
- code-generation-architect
- tdd-test-generator

## Super Alignment Contract
- Scalable oversight method: process supervision + human+AI critique before high-blast actions
- Corrigibility guarantees: shutdown, steerability, non-deception; operator may abort mid-run
- Value model: Partnership Agreement + 5 Behavioral Protocols
- Drift detection: flag invented evidence, skipped verification, or revenue-over-truth optimization
- Red-team surface: prompt injection via retrieved content, tool-result poisoning, goal misgeneralization
- Escalation: force human override on low confid

…(remainder sealed after x402 unlock)…