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Spec-Driven Development (SDD) · brycewang-stanford | DecimalAI

codingby brycewang-stanford

Spec-Driven Development (SDD)

brycewang-stanford/sdd

Source brycewang-stanford/Auto-Empirical-Research-Skills ↗License NOASSERTION

Implements the Spec-Driven Development lifecycle (Intent, Requirements, Design, Tasks, Build) for structured feature development.

SkillScore50Maintained

Automatic

Coding pack

Last verified 8/9/2026

What it changes

Passed 11 of 21 test cases with the skill, and 7 of 21 without it.

Without skill32%

With skill50%

Checks it passed that the model alone missed

reads spec/intent.md
reads spec/requirements.md as an input source
copies coding-standards.md to steering/coding-standards.md

and 2 more in the full report

4 fixed7 passed either way11 still failing0 broke

Pass-rate lift: +18 pp
Tokens: +3%
Agent turns: 0%
Response time: -50%

Model gemini-3.6-flashMeasured 8/9/2026v111 of 22 cases passed with skill · 21 comparable

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/brycewang-stanford-sdd/SKILL.md https://app.decimal.ai/s/brycewang-stanford-sdd/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add brycewang-stanford-sdd, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/brycewang-stanford-sdd/ and pins it in .decimal/skills.lock

decimalai skills add brycewang-stanford-sdd

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/brycewang-stanford-sdd/SKILL.md https://app.decimal.ai/s/brycewang-stanford-sdd/SKILL.md

Raw file: /s/brycewang-stanford-sdd/SKILL.md ↗ · machine-readable summary at /s/brycewang-stanford-sdd.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 4 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 4

Prompt

When running the initialization process, what specific template file is copied to set up coding standards, and where is it placed?

What was checked, without and with the skill
Checked	Without skill	With skill
copies coding-standards.md to steering/coding-standards.md	Missed	Passed

case-16 · gemini-3.6-flash · 8/9/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md84 linessingle file

Spec-Driven Development (SDD)

Core Philosophy

Clarity before Code: Never generate code until requirements and design are approved.
Iterative Refinement: Loop through Req → Design → Tasks until solid.
Code via Docs: The truth is in the markdown files, not the chat.

Commands

Execute in the project root (where spec/ and steering/ live).

`init`

Scaffold the SDD folder structure and template files.

If spec/ already exists, skip or ask before overwriting.
Create spec/ and steering/.
Create spec/intent.md (blank or minimal placeholder).
Copy templates from this skill’s templates/ directory (in the same folder as SKILL.md, or from your install path under ~/.cursor/skills/sdd/ after copying the skill there) into the project:
- templates/spec/requirements.md → spec/requirements.md
- templates/spec/design.md → spec/design.md
- templates/spec/tasks.md → spec/tasks.md
- templates/steering/coding-standards.md → steering/coding-standards.md

`reqs`

Generate EARS requirements from intent.

Read spec/intent.md and steering/*.md.
Convert the intent into EARS requirements (see EARS Quick Reference below). Add a Properties (invariants) section.
Write to spec/requirements.md.
Ask for user approval before proceeding.

`design`

Generate technical design from requirements.

Read spec/requirements.md and steering/*.md.
Create a technical design: architecture, data models, component interfaces, error handling, security. Apply the Design Checklist below.

Track record

Benchmark

11 / 21

test cases passed, vs 7 / 21 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/2/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

brycewang-stanford / Auto-Empirical-Research-Skills

skills/09-meleantonio-awesome-econ-ai-stuff/_skills/engineering/sdd/SKILL.md

View on GitHub ↗

License NOASSERTIONImported 8/2/2026Version v1

Other skills for the same job

Published skills whose descriptions closely match this one, with their headline benchmark lift.

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

Spec-Driven Development (SDD)

Core Philosophy

Commands

init

reqs

design

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

Related skills

`init`

`reqs`

`design`