openapi-cli-gen 0.0.4

Generate typed Python CLIs from OpenAPI specs with Pydantic model flattening into CLI flags

openapi-cli-gen

Generate a full CLI from any OpenAPI spec in seconds. Nested request bodies become flat --flags automatically.

# Instead of this:
curl -X POST /api/users -d '{"name": "John", "address": {"city": "NYC", "state": "NY"}}'

# You get this:
mycli users create --name John --address.city NYC --address.state NY

Install

# Recommended: pipx (installs in isolated environment)
pipx install openapi-cli-gen

# Or with uv
uv tool install openapi-cli-gen

# Or in a virtual environment
pip install openapi-cli-gen

Try It Now

Point at any public API — no setup, no files needed:

# Get a random cat fact
openapi-cli-gen run --spec https://catfact.ninja/docs Facts get-random --base-url https://catfact.ninja

# Browse cat breeds as a table
openapi-cli-gen run --spec https://catfact.ninja/docs Breeds get --limit 5 --output-format table --base-url https://catfact.ninja

┏━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┓
┃ breed          ┃ country       ┃ origin         ┃ coat       ┃ pattern       ┃
┡━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━━━━━┩
│ Abyssinian     │ Ethiopia      │ Natural/Stand… │ Short      │ Ticked        │
│ Aegean         │ Greece        │ Natural/Stand… │ Semi-long  │ Bi- or tri-…  │
│ American Curl  │ United States │ Mutation       │ Short/Long │ All           │
└────────────────┴───────────────┴────────────────┴────────────┴───────────────┘

# Inspect any spec to see what commands you'd get
openapi-cli-gen inspect --spec https://petstore3.swagger.io/api/v3/openapi.json

Generate Your Own CLI

openapi-cli-gen generate --spec https://api.example.com/openapi.json --name mycli
cd mycli && pip install -e .
mycli users list
mycli users create --name John --email [e-mail] --address.city NYC

Ship it to your users: pip install mycli.

Nested Model Flattening

The core feature. Works at any depth:

--address.city NYC                                  # depth 1
--ceo.name Bob --ceo.email [e-mail]             # depth 2
--retry.backoff.strategy exponential                 # depth 3
--tags admin --tags reviewer                         # arrays
--environment JAVA_HOME=/usr/lib/jvm                 # dicts
--role admin                                         # enums (validated)
--address '{"street": "123 Main", "city": "NYC"}'   # JSON fallback

As a Library

from openapi_cli_gen import build_cli

app = build_cli(spec="openapi.yaml", name="mycli")
app()

Or plug API commands into your existing CLI:

from openapi_cli_gen import build_command_group

registry = build_command_group(spec="openapi.yaml", name="mycli")

Auth

Auto-configures from your spec's securitySchemes:

export MYCLI_TOKEN=sk-xxx    # env var
mycli users list --token sk-xxx  # or flag (overrides env)

Tested Against Real APIs

Live CRUD validated against Apache Airflow 3.2.0 (111 endpoints) — create, update, delete connections, trigger DAG runs, manage pools and variables. All pass.

Also parsed: Petstore (19 endpoints), ReqRes (40), Redocly Museum (8), Open-Meteo (1). 182 endpoints across 6 APIs, all specs parse successfully.

Compared to Alternatives

Feature	openapi-cli-gen	specli	restish	Stainless
Nested model flattening	All depths	Scalars only	No	2 levels
Generates distributable code	Yes	No	No	Yes
Runtime mode (no codegen)	Yes	Yes	Yes	No
Pluggable into existing CLI	Yes	No	No	No
Open source	Yes	Yes	Yes	No

Status

Early release (v0.0.1). Core features work. Issues and feedback welcome.

License

MIT