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fastapi-app · ccplugins | DecimalAI

codingby ccplugins

fastapi-app

ccplugins/fastapi-app

Source ccplugins/awesome-claude-code-plugins ↗License Apache-2.0

Bootstrap a new FastAPI backend with async SQLAlchemy 2.0, asyncpg, Alembic, Pydantic v2, and no deprecated APIs.

SkillScore95Maintained

Automatic

Coding pack

Last verified 9/24/2026

What it changes

Passed 21 of 22 test cases with the skill, and 9 of 22 without it.

Without skill41%

With skill95%

Checks it passed that the model alone missed

Executes pytest during quality validation.
Verifies the HTTP /health endpoint status.
Includes ruff in development dependencies.

and 16 more in the full report

12 fixed9 passed either way1 still failing0 broke

Pass-rate lift: +55 pp
Tokens: -7%
Agent turns: 0%
Response time: -49%

Model gemini-3.6-flashMeasured 9/24/2026v121 of 22 cases passed with skill

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/ccplugins-fastapi-app/SKILL.md https://app.decimal.ai/s/ccplugins-fastapi-app/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add ccplugins-fastapi-app, 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/ccplugins-fastapi-app/ and pins it in .decimal/skills.lock

decimalai skills add ccplugins-fastapi-app

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

curl -fsSL --create-dirs -o .claude/skills/ccplugins-fastapi-app/SKILL.md https://app.decimal.ai/s/ccplugins-fastapi-app/SKILL.md

Raw file: /s/ccplugins-fastapi-app/SKILL.md ↗ · machine-readable summary at /s/ccplugins-fastapi-app.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 12 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 12

Prompt

We are choosing options for a new Python backend service. Is Django Admin, React Admin, or SQLAdmin specified in our standard admin interface choices?

What was checked, without and with the skill
Checked	Without skill	With skill
Identifies SQLAdmin as the supported admin interface option.	Missed	Passed

case-09 · gemini-3.6-flash · 9/24/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md82 lines6 filesincludes scripts

fastapi-app

Bootstrap a new FastAPI backend the way this owner builds them: async SQLAlchemy 2.0 with asyncpg, Alembic migrations, Pydantic v2 settings, a layered structure (routers, services, models, schemas), JWT auth, and the house git and CI workflow. Deployable to a container or Vercel.

First read the shared rules (they override anything you remember): ../shared/house-rules.md, ../shared/no-ai-attribution.md, ../shared/git-and-ci.md, ../shared/docs-and-context.md, ../shared/hardening.md, and (for public repos) ../shared/open-source-docs.md.

Step 0. Get the brief, then ask the variant questions (hard stop)

This is a hard stop. Do not run any scaffolding command until the user has answered.

First, get the project brief: one paragraph on what the service does, its main resources and endpoints, who calls it, and any hard constraints. If the user has not given one, ask for it. The brief drives naming, the domain modules, and the data model.

Then ask the variant questions. If a choice has multiple options, ask; do not assume. Ask in one batch, then proceed.

Repo visibility: private, open-source, or private-plus-open-source.
Auth: JWT (python-jose or PyJWT), OAuth (Google), API-key, or none yet.
Database: Postgres via async SQLAlchemy + asyncpg (default), or none yet.
Dependency tooling: uv (default, fast) or pip + requirements.txt.
Admin UI: SQLAdmin, or none.
Deploy target: Docker container (default) or Vercel serverless.

If the user already answered some, do not re-ask.

Step 1. Verify environment and current versions

Check Python (python3 --version, want a current supported 3.x).
Run scripts/check-latest.sh for current stable versions from PyPI. Pin those, not versions from memory (../shared/house-rules.md rule 2).
Pull current FastAPI, SQLAlchemy 2.0, and Pydantic v2 docs via Context7 before

Track record

Benchmark

21 / 22

test cases passed, vs 9 / 22 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 v5 — 8/17/2026

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

ccplugins / awesome-claude-code-plugins

plugins/app-starter/skills/fastapi-app/SKILL.md

View on GitHub ↗

License Apache-2.0Imported 8/17/2026Version v1Bundled 5 files · scripts

Other skills for the same job

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ccplugins/nextjs-appBootstrap a new Next.js (App Router, TypeScript) web app with current packages and no deprecated APIs. Use when the user wants to start, scaffold, or set up a new Next.js project, a React web app, a SaaS or dashboard or landing page on Next.js, or asks to "create a new nextjs app". Handles private, open-source, and private-plus-open-source variants, Prisma and Postgres, next-auth, Tailwind, and shadcn or Mantine.Close match+55 pp pass-rate 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

fastapi-app

Step 0. Get the brief, then ask the variant questions (hard stop)

Step 1. Verify environment and current versions

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

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