parlant

What it does

Built around the observation that prompt-crafting does not survive contact with real users: agents ignore system prompts, hallucinate at the worst moment and handle edge cases differently every time. Parlant enforces behaviour through defined principles and guidelines rather than hoping the model complies, with checks that the conversation stayed inside them. Docs in Japanese among other languages. Enforcement is not a guarantee — keep a human handoff for money, contracts and health. Apache-2.0.

Summary based on the project's own description. The Japanese page has a fuller beginner guide: setup difficulty, what to prepare, and a step-by-step start.

Screenshots & visuals

Before you start

• Setup difficultySome setup needed
• Command lineRequired
• API keyRequired
• Sends data onlineYes

Judged automatically from the project's own metadata. Always confirm on the official page.

parlant FAQ

Is parlant free?

parlant itself is free, but it needs an API key for an external AI service. That service charges separately, though some have a free tier.

Do I need to install anything or write code to use parlant?

It needs the command line. If you are not comfortable typing commands, expect to get stuck during setup.

Does parlant work on a phone?

No. It needs a computer.

Can I use parlant commercially?

The licence is Apache-2.0, which permits commercial use. Conditions such as keeping the copyright notice still apply, so read the licence text before shipping it inside something.

How it compares

The conditions that decide whether you can actually use it, side by side.

"Sends data out" means your input is uploaded to someone's server. Pick "No" when the material cannot leave your organisation.

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