← Use cases · Coding
AI agents for trying a coding agent without paying first
Short answer: Gemini CLI has a free tier with a Google account and is open source. goose and OpenCode are open source too, but you pay your model provider.
Tools for this job
| # | Tool | Why for this job | AgentPick Score | Link |
|---|---|---|---|---|
| #1 |  OpenCode | Open source, bring your own model | 99/100 | Official source ↗ |
| #2 |  Gemini CLI | Open source, free tier with a Google account | 95/100 | Official source ↗ |
| #3 |  goose | Open-source local agent (CLI and desktop), model-agnostic | 92/100 | Official source ↗ |
Ordered by AgentPick Score. Links may become affiliate links; they never change order. Disclosure.
How to do it
- Install in a throwaway repo first.
- Give it one small, testable task.
- Check what it changed with git diff.
- Only then point it at real code.
Starter prompt
In this repo, add a unit test for [function] covering [edge case]. Don't change production code. Show me the diff.
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