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Tutorial 01 — Your First Evaluation

By the end you'll have installed coder-eval, pointed it at an API key, run a built-in task, and read the result. ~5 minutes.

Prerequisites

  • Python 3.13+
  • uv — brew install uv (macOS) or pip install uv
  • Claude CLI — brew install claude (install guide)
  • An Anthropic API key

1. Install

git clone https://github.com/UiPath/coder_eval.git
cd coder_eval
uv sync --extra dev

uv sync creates a .venv/. Activate it to run coder-eval directly and drop the uv run prefix used throughout this tutorial:

source .venv/bin/activate
# now `coder-eval ...` works on its own; e.g. `coder-eval run tasks/hello_date.yaml`

The uv run coder-eval ... form below works with or without activating — uv run resolves the same .venv — so use whichever you prefer.

2. Configure your API key

cp .env.example .env
# Edit .env and set ANTHROPIC_API_KEY=sk-ant-...

Heads up: usage telemetry is on by default. To turn it off, add TELEMETRY_ENABLED=false to your .env. See the User Guide.

3. Validate before running

uv run coder-eval plan tasks/hello_date.yaml

plan checks the task's syntax, required tools, and API keys without spending any tokens — a good habit before every run.

4. Run your first task

uv run coder-eval run tasks/hello_date.yaml

This spins up an isolated sandbox, sends the task prompt to the agent, records every tool call, and scores the result against the task's success criteria.

Add --stream full to watch the agent work in real time:

uv run coder-eval run tasks/hello_date.yaml --stream full

5. Read the result

uv run coder-eval report runs/latest

runs/latest is a symlink to the newest runs/<ts>/. The per-task result lives at runs/latest/<variant>/<task>/<NN>/task.json (with task.log and artifacts/ beside it); the run-level run.json/run.md sit at the run root. See the Output Structure reference for the full layout.

Next steps