Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/emilyli2020/wave/scaffold-backendnpx skills add emilyLi2020/WAVE --skill scaffold-backendgit clone --depth 1 https://github.com/emilyLi2020/WAVEWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/emilyli2020/wave/scaffold-backend)<a href="https://agentmods.dev/skills/emilyli2020/wave/scaffold-backend"><img src="https://agentmods.dev/badge/skills/emilyli2020/wave/scaffold-backend.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00086 | $0.02714 |
| Opus 5 | $0.00043 | $0.01357 |
| Sonnet 5 | $0.00017 | $0.00543 |
| Haiku 4.5 | $0.00009 | $0.00271 |
Grade A, and why
scaffold-backend scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl http://localhost:8000/health How it starts
The opening of the file, as written. The whole thing — 345 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Scaffold Backend
This skill creates the backend for the user's project inside a server/ directory at the repo root. Like scaffold-frontend, it is driven entirely by PRD.md and AGENTS.md. Every route, every Pydantic model, and the decision to include Supabase are all derived from the PRD.
Preflight: PRD, AGENTS, and Backend Needed
Before doing anything else, check three conditions:
AGENTS.mdexists at the repo root.PRD.mdexists at the repo root.PRD.md > Backend Needed?starts withYes.
test -f AGENTS.md && test -f PRD.md || { echo "MISSING_DOCS"; exit 1; }
grep -A1 "^## Backend Needed?" PRD.md | tail -n1
Fail-fast responses
-
If
AGENTS.mdorPRD.mdis missing, STOP and respond exactly:This skill cannot run yet.
AGENTS.mdandPRD.mdmust exist at the repo root. Run thedomain-to-specskill first, or run thequickstartskill to chain everything automatically. -
If
Backend Needed?isNo(or empty), STOP and respond exactly:This project does not need a backend according to
PRD.md > Backend Needed?. If that is wrong, rerun thedomain-to-specskill to update the PRD. Otherwise, run thefeature-builderskill to build out frontend features.
Do not create any files in either fail case.
Step 1: Read the PRD and AGENTS
Extract from PRD.md:
- Routes list (from
PRD.md > Backend Routes). Each bullet becomes a FastAPI route. - Data model (from
PRD.md > Data Model). Each entity becomes a Pydantic model. - Domain constraints (from
PRD.md > Domain Constraints). Used to decide what validation rules to add. - Auth requirement. Check if
PRD.md > Core Features (MVP)orPRD.md > User Flowmention login, accounts, or user-specific data. If yes, Supabase Auth is needed.
Extract from AGENTS.md:
- The Python version and FastAPI conventions.
- Whether Supabase is listed under
## Tech Stack > Database.
Step 2: Ask About Supabase
Prompt the user:
"Your PRD implies this app needs a database. I recommend Supabase because it is free, hosted, and integrates auth, Postgres, and storage in one service. Should I wire it up now? (yes / no / later)"
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 5d ago First seen · 345 lines · 86 tokens per session scan A 27d820c1cefe
scaffold-backend is a skill published in the GitHub repository emilyLi2020/WAVE (2 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 86 tokens to every session and 2,714 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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