Topic

Building CLI Tools for LLM APIs

12 posts on building cli tools for llm apis — part of api integration on the n4n AI blog.

Testing an LLM CLI tool: mocking GPT-5 responses in Python

Learn testing llm cli mock gpt-5 python by building a mocked OpenAI-compatible server and pytest harness for a CLI tool end to end.

July 17, 20263 min read

API integrationHow-to

Streaming GPT-5 responses to the terminal in Python

Learn how to stream GPT-5 responses to the terminal in Python with Server-Sent Events, building a minimal CLI that prints tokens as they arrive.

July 17, 20264 min read

API integrationHow-to

Storing API keys safely in a Python LLM CLI tool

A hands-on tutorial to store API keys Python CLI apps securely using environment variables, OS keyring, and encrypted files with verification for LLM tooling.

July 17, 20264 min read

API integrationHow-to

Packaging your Python LLM CLI tool with pipx

Learn how to package python llm cli pipx tools for clean isolated installs, from project layout to publishing on PyPI and verifying the install.

July 17, 20263 min read

API integrationHow-to

From bash script to Python CLI: wrapping GPT-5 calls with Click

Build a robust Python CLI for GPT-5 using Click: project setup, API calls, streaming, retries, and packaging with runnable code and verification steps.

July 17, 20263 min read

API integrationTutorial

Building a Go CLI with Cobra, Viper, and the OpenAI API

Build a Go CLI with Cobra and Viper that calls the OpenAI API. Step-by-step tutorial with runnable code for a practical llm command-line tool.

July 17, 20262 min read

API integrationTutorial

Building a batch summarization CLI with the Claude API in Go

Step-by-step guide to build a batch summarization cli claude api go tool that processes files concurrently with retries and shows expected output.

July 17, 20262 min read

API integrationHow-to

Adding progress bars and spinners to a Go LLM CLI

Step-by-step guide to adding progress bars and spinners to a Go CLI for LLM API calls, covering streaming, spinners, and clean interrupts.

July 17, 20263 min read

API integrationTutorial

Building an LLM CLI tool in Go with Cobra and Claude Opus 4.8

Step-by-step guide to building a Go CLI with Cobra that queries Claude Opus 4.8 via the Anthropic API, including runnable code and expected output.

July 16, 20263 min read

API integrationGuide

Building a multi-model CLI in Python: GPT-5, Claude Opus 4.8, Gemini 3

A practical guide to building a multi-model CLI in Python that routes between GPT-5, Claude Opus 4.8, and Gemini 3 with clean abstractions.

July 16, 20263 min read

API integrationTutorial

Build a GPT-5 command-line client in Python with Click

Step-by-step tutorial to build gpt-5 cli python tool with Click and the OpenAI SDK, including streaming, config, and error handling for engineers.

July 16, 20263 min read

API integrationHow-to

A Go CLI for comparing Gemini 3 and Llama 4 outputs side by side

Build a Go CLI to send one prompt to Gemini 3 and Llama 4 and print responses side by side via an OpenAI-compatible gateway, with full runnable code.

July 16, 20262 min read