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 skills add 0x-Professor/Agent-Skills-Hub --skill web-backend-buildergit clone --depth 1 https://github.com/0x-Professor/Agent-Skills-HubWrote 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/0x-professor/agent-skills-hub/web-backend-builder)<a href="https://agentmods.dev/skills/0x-professor/agent-skills-hub/web-backend-builder"><img src="https://agentmods.dev/badge/skills/0x-professor/agent-skills-hub/web-backend-builder/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/0x-professor/agent-skills-hub/web-backend-builder"><img src="https://agentmods.dev/badge/skills/0x-professor/agent-skills-hub/web-backend-builder.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00024 | $0.00361 |
| Opus 5 | $0.00012 | $0.00180 |
| Sonnet 5 | $0.00005 | $0.00072 |
| Haiku 4.5 | $0.00002 | $0.00036 |
Grade A, and why
web-backend-builder scanned grade A with 0 findings 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 10d 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Web Backend Builder
Objective
Scaffold a backend foundation from project-config.json including data model
planning, ORM recommendations, API endpoint inventory, and OpenAPI output.
Required Workflow
- Read
project-config.json. - Scaffold the selected backend framework (FastAPI, Express, Django, Gin, and other configured options).
- Define data models from project type and ask for missing entities when unclear.
- Configure ORM/query layer guidance:
- Prisma (Node.js)
- Drizzle ORM (TypeScript)
- SQLAlchemy (FastAPI/Python)
- Mongoose (MongoDB)
- Scaffold CRUD endpoints, auth middleware, and file upload handlers.
- If Supabase is selected, include
@supabase/supabase-js, RLS policy planning, and Edge Function notes. - Enforce environment variable setup with
.env.exampleand no committed secrets. - Generate
openapi.yamlcovering all endpoints. - Output backend scaffold artifacts,
openapi.yaml, andbackend-report.json.
Execution
python skills/web-backend-builder/scripts/backend_builder.py --input <workspace> --output <out.json> --format json
References
references/tools.md
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 10d ago First seen · 49 lines · 24 tokens per session scan A 7b77e68afd94
web-backend-builder is a skill published in the GitHub repository 0x-Professor/Agent-Skills-Hub (10 stars, last pushed 6mo ago), licensed Apache-2.0. It adds 24 tokens to every session and 361 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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