Agent skill

Fastapi Backend

FastAPI best practices for building production Python backends.

Apache-2.0Auto-check passedBackend & APIs

Install Fastapi Backend

skills CLI

$ npx skills add cohen-liel/hivemind --skill fastapi-backend -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install cohen-liel/hivemind fastapi-backend --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/cohen-liel/hivemind.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/fastapi-backend .claude/skills/fastapi-backend && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "fastapi-backend" agent skill from https://github.com/cohen-liel/hivemind/tree/main/.claude/skills/fastapi-backend into .claude/skills/fastapi-backend/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fastapi-backend", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/cohen-liel/hivemind/tree/main/.claude/skills/fastapi-backend

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add cohen-liel/hivemind --skill fastapi-backend -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install cohen-liel/hivemind fastapi-backend --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/cohen-liel/hivemind.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/fastapi-backend .agents/skills/fastapi-backend && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "fastapi-backend" agent skill from https://github.com/cohen-liel/hivemind/tree/main/.claude/skills/fastapi-backend into .agents/skills/fastapi-backend/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fastapi-backend", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add cohen-liel/hivemind --skill fastapi-backend -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install cohen-liel/hivemind fastapi-backend --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/cohen-liel/hivemind.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/fastapi-backend .cursor/skills/fastapi-backend && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "fastapi-backend" agent skill from https://github.com/cohen-liel/hivemind/tree/main/.claude/skills/fastapi-backend into .cursor/skills/fastapi-backend/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fastapi-backend", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/cohen-liel/hivemind.git --path .claude/skills/fastapi-backend

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add cohen-liel/hivemind --skill fastapi-backend -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install cohen-liel/hivemind fastapi-backend --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/cohen-liel/hivemind.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/fastapi-backend .gemini/skills/fastapi-backend && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "fastapi-backend" agent skill from https://github.com/cohen-liel/hivemind/tree/main/.claude/skills/fastapi-backend into .gemini/skills/fastapi-backend/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fastapi-backend", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install cohen-liel/hivemind fastapi-backend

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add cohen-liel/hivemind --skill fastapi-backend -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/cohen-liel/hivemind.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/fastapi-backend .github/skills/fastapi-backend && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "fastapi-backend" agent skill from https://github.com/cohen-liel/hivemind/tree/main/.claude/skills/fastapi-backend into .github/skills/fastapi-backend/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fastapi-backend", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add cohen-liel/hivemind --skill fastapi-backend -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install cohen-liel/hivemind fastapi-backend --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/cohen-liel/hivemind.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/fastapi-backend .opencode/skills/fastapi-backend && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "fastapi-backend" agent skill from https://github.com/cohen-liel/hivemind/tree/main/.claude/skills/fastapi-backend into .opencode/skills/fastapi-backend/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fastapi-backend", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: fastapi-backend
GitHub stars: 110
Token cost: ~710 tokens
SKILL.md length: 79 words
Files: 1
Skills in repo: 33
Repo updated: Apr 18, 2026
First seen: Oct 7, 2026
Licence: Apache-2.0

At a glance

FastAPI best practices for building production Python backends.

Building REST APIs
SKILL.md covers Project Structure, Core Patterns and Rules
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
Async endpoints

What it does

Fastapi Backend is an agent skill from cohen-liel/hivemind. FastAPI best practices for building production Python backends. Use when building REST APIs, async endpoints, Pydantic models, dependency injection, middleware, or any FastAPI server.

Its SKILL.md is about 710 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Backend & APIs, covering Backend development and Design patterns. It works with FastAPI, Pydantic and Python. The repository describes itself as: One prompt. A full AI engineering team. Go lie on the couch. 🧠. The licence is Apache-2.0.

When your agent uses it

Building REST APIs
Async endpoints
Pydantic models
Dependency injection

Example prompts

“/fastapi-backend”

Requirements

Python 3

What it can do on your machine

Read from SKILL.md and the folder at commit 918dd9b. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are python).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Fastapi Backend loads about 710 tokens when it runs. Until then it costs about 50 tokens; SKILL.md has 79 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~50
When it runs · the whole SKILL.md, loaded when a task matches: ~710

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from cohen-liel/hivemind at commit 918dd9b, republished under its Apache-2.0 licence (© cohen-liel). 79 words, ~710 tokens.

Download SKILL.mdSave it as .claude/skills/fastapi-backend/SKILL.md (or your agent's skills folder).

name: fastapi-backend
description: FastAPI best practices for building production Python backends. Use when building REST APIs, async endpoints, Pydantic models, dependency injection, middleware, or any FastAPI server.

FastAPI Backend Patterns

Project Structure

app/
  main.py          # FastAPI app, lifespan, middleware
  config.py        # Pydantic Settings, env vars
  models/          # SQLAlchemy ORM models
  schemas/         # Pydantic request/response schemas
  routers/         # APIRouter per domain (auth, users, posts)
  services/        # Business logic (no DB or HTTP here)
  deps.py          # Shared dependencies (get_db, get_current_user)
  database.py      # Engine, SessionLocal, Base

Core Patterns

App setup with lifespan

python

from contextlib import asynccontextmanager
from fastapi import FastAPI

@asynccontextmanager
async def lifespan(app: FastAPI):
    # startup
    await database.connect()
    yield
    # shutdown
    await database.disconnect()

app = FastAPI(lifespan=lifespan)

Dependency injection

python

# deps.py
async def get_db() -> AsyncGenerator[AsyncSession, None]:
    async with AsyncSessionLocal() as session:
        try:
            yield session
            await session.commit()
        except Exception:
            await session.rollback()
            raise

async def get_current_user(
    token: str = Depends(oauth2_scheme),
    db: AsyncSession = Depends(get_db)
) -> User:
    ...

Router pattern

python

router = APIRouter(prefix="/users", tags=["users"])

@router.get("/{user_id}", response_model=UserResponse)
async def get_user(user_id: int, db: AsyncSession = Depends(get_db)):
    user = await db.get(User, user_id)
    if not user:
        raise HTTPException(status_code=404, detail="User not found")
    return user

Error handling

python

from fastapi import Request
from fastapi.responses import JSONResponse

@app.exception_handler(ValueError)
async def value_error_handler(request: Request, exc: ValueError):
    return JSONResponse(status_code=400, content={"detail": str(exc)})

Pydantic schemas

python

class UserCreate(BaseModel):
    email: EmailStr
    password: str = Field(min_length=8)
    name: str = Field(max_length=100)

class UserResponse(BaseModel):
    id: int
    email: str
    name: str
    model_config = ConfigDict(from_attributes=True)

Rules

Always use async def for endpoints
Validate ALL input with Pydantic (never trust raw dicts)
Use HTTPException with specific status codes (not 500 for everything)
Never put business logic in route handlers — use service layer
Use response_model to control what's returned (never expose passwords)
Add CORS middleware for browser clients
Use Depends() for database sessions — never create sessions manually

Files

Just SKILL.md in .claude/skills/fastapi-backend of cohen-liel/hivemind.

Open the folder on GitHubat commit 918dd9b

Compare with similar skills

Fastapi Backend next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Fastapi Backend compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Fastapi Backend this skillcohen-liel/hivemind	110	—	~710	Automated safety check: Pass	Apache-2.0	5 mo ago
Framework Migration AssistantArabelaTso/Skills-4-SE	253	—	~1.9k	Automated safety check: Pass	Apache-2.0	1 mo ago
Python Fastapi Patternsaiskillstore/marketplace	430	1 repos	~1.3k	Automated safety check: Notes	None	yesterday
Fastapi ItechmeatKilo-Org/kilo-marketplace	190	—	~1.5k	Automated safety check: Pass	MIT	10 days ago
Mastering Python SkillSpillwaveSolutions/agent-brain	119	—	~1.4k	Automated safety check: Notes	MIT	18 days ago
Fastcrudbenavlabs/fastcrud	1.6k	—	~5k	Automated safety check: Pass	MIT	13 days ago

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Questions about Fastapi Backend

What does Fastapi Backend do?

FastAPI best practices for building production Python backends. Fastapi Backend is an agent skill from cohen-liel/hivemind. FastAPI best practices for building production Python backends.

When should I use Fastapi Backend?

Fastapi Backend fits situations like: building REST APIs; async endpoints; pydantic models; dependency injection.

How do I install Fastapi Backend in Claude Code?

Run `npx skills add cohen-liel/hivemind --skill fastapi-backend -a claude-code`. Or copy the skill folder (.claude/skills/fastapi-backend in cohen-liel/hivemind) into .claude/skills/fastapi-backend in your project. Claude Code loads it when a task matches its description.

How do I install Fastapi Backend in Codex?

Run `npx skills add cohen-liel/hivemind --skill fastapi-backend -a codex`. Or copy the skill folder (.claude/skills/fastapi-backend in cohen-liel/hivemind) into .agents/skills/fastapi-backend in your project. Codex loads it when a task matches its description.

Can I use Fastapi Backend in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add cohen-liel/hivemind --skill fastapi-backend -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/fastapi-backend, .gemini/skills/fastapi-backend, .github/skills/fastapi-backend and .opencode/skills/fastapi-backend in your project.

What does Fastapi Backend need to run?

SKILL.md names no scripts, command-line tools or credentials: Fastapi Backend is instructions for the agent only. Our summary lists: Python 3.

Does Fastapi Backend access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Fastapi Backend safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Fastapi Backend use?

Fastapi Backend is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Fastapi Backend use?

About 710 tokens (SKILL.md is roughly 2.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Fastapi Backend?

Skills that share tags, products or a category with Fastapi Backend: Framework Migration Assistant (ArabelaTso/Skills-4-SE, 253 stars), Python Fastapi Patterns (aiskillstore/marketplace, 430 stars), Fastapi Itechmeat (Kilo-Org/kilo-marketplace, 190 stars) and Mastering Python Skill (SpillwaveSolutions/agent-brain, 119 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Fastapi Backend?

cohen-liel (a GitHub user) maintains it in cohen-liel/hivemind, which has 110 GitHub stars. The repository holds 33 skills in this directory. The repository was last updated on April 18, 2026.

Source: cohen-liel/hivemind on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Fastapi Backend

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

FastAPI Backend Patterns

Project Structure

Core Patterns

App setup with lifespan

Dependency injection

Router pattern

Error handling

Pydantic schemas

Rules

Files

Compare with similar skills

Similar skills

More from cohen-liel/hivemind

Related

Questions about Fastapi Backend