Build your own coding agent

Minimal workshop scaffold in Python and C++.

Setup

Create a .env file from the example:

cp .env.example .env

Fill in:

• OPENAI_BASE_URL
• OPENAI_API_KEY

CLI

The CLI:

• Loads the .env file
• Prints the system prompt
• Runs pwd via bash
• Prints the command output and exit code
• Sends one /chat/completions request
• Prints the JSON response

Python

Run:

uv run agent

Select a different model:

uv run agent --model openai/gpt-oss-120b

C++

Build and run:

cmake -B build
cmake --build build -j
build/agent

Select a different model:

build/agent --model openai/gpt-oss-120b