Cursor Rules for FastAPI

7 FastAPI rules your agent actually follows: each one attaches only to the files it's about, states the version-specific behavior, and installs with one command.

$12 one-time

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Format and license: Zip, 19 KB, v1.0, 26 files. You may use and modify this kit for your own work and for clients you serve, including paid client work. Not affiliated with or endorsed by Cursor (Anysphere) or the FastAPI project.
Refunds: 14-day refund: if it doesn’t work and we can’t fix it, email hello@youraitools.co within 14 days and we refund you. Refund policy

What it is

7 Cursor project rules (.mdc) for FastAPI, scoped so each loads only when relevant, with an installer that detects your stack, an AGENTS.md exporter (Claude Code, Codex) and a rules linter. Written against current docs (checked Nov 2026).

What you get

The screenshot is real output from the kit’s own commands. Tested from a fresh download of this exact zip: ./run_tests.sh ran 8 tests OK on Python 3.13 and 3.10.

Real terminal output from Cursor Rules for FastAPI: demo and passing tests

Install in 30 seconds

python3 tools/install_rules.py --detect /path/to/app          # what it finds
python3 tools/install_rules.py /path/to/app --auto            # install rules for detected stacks into .cursor/rules/
python3 tools/install_rules.py /path/to/app --all --agents-md # everything, plus AGENTS.md
python3 tools/lint_rules.py /path/to/app/.cursor/rules --project /path/to/app

Existing files are never overwritten unless you pass --force; --dry-run previews. ./tools/demo.sh runs it on examples/sample-app; ./run_tests.sh runs the tests. As a Cursor plugin, the manifest is .cursor-plugin/plugin.json.

The rules

Rule	Loads	First instruction
fastapi-overview.mdc	always	Check the installed fastapi version before using an API
fastapi-routes-deps.mdc	by file (app//.py, src//.py, main.py)	Declare parameters with Annotated: user: Annotated[User, Depends(get_current_user)], q: Annotated[str / None,...
fastapi-pydantic.mdc	by file (app/schemas//.py, app/models//.py, /schemas.py)	Use v2 APIs: model_config = ConfigDict(...), model_dump(), model_validate(), field_validator, model_validator
fastapi-database.mdc	by file (app/db//.py, app/repositories//.py, app/crud//.py, alembic//.py, alembic.ini)	One session per request via a yield dependency
fastapi-security.mdc	by file (app/core//.py, app/auth//.py, app/security//.py, app/routers//.py, app/main.py)	Protect routes with dependencies (Depends(get_current_user), Security(..., scopes=[...])) at the router level...
fastapi-testing.mdc	by file (tests//.py, /test_.py, conftest.py)	Use TestClient (sync) or httpx.AsyncClient with ASGITransport for async tests
fastapi-performance.mdc	Agent picks it	With a response_model or return type, FastAPI serializes JSON with Pydantic (Rust) directly (0.130+)

Honest limits

Rules guide the model; they don't enforce anything. Check version-specific advice against the versions in your lockfile (each overview rule tells the agent to do this).
Detection is file-based (package.json, manage.py/requirements, Gemfile, supabase/); in monorepos run it per package or use --stack.

Format and license

Zip, 19 KB, v1.0, 26 files. You may use and modify this kit for your own work and for clients you serve, including paid client work. Not affiliated with or endorsed by Cursor (Anysphere) or the FastAPI project.

FAQ

Which FastAPI version?: Written against 0.162 (Nov 2026); each version-specific rule names the release it changed in, and the overview rule tells the agent to check the installed version.
Will it overwrite my rules?: No, existing files are skipped unless you pass --force.
Claude Code or Codex?: Run the installer with --agents-md to write the same rules into AGENTS.md.
How do I get the files?: Right after payment, Stripe’s confirmation page shows your download link.
Refunds?: Email hello@youraitools.co within 14 days if it doesn’t work and we can’t fix it.
Can I pay with crypto?: Yes. Pay the same price in USDC or USDT on Base, Ethereum, Arbitrum, Optimism, Polygon or Solana from the "Pay with crypto" button, with no account or KYC. We check the payment on-chain and show your download links as soon as it confirms.

Get Cursor Rules for FastAPI

7 Cursor rules for FastAPI, written against current docs. Installs in one command, exports AGENTS.md for Claude Code and Codex. $12 once.

$12 one-time

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Save with a bundle

Cursor Rules All-Stacks Bundle: 9 products for $39 ($108 separately, you save $69).

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