> For the complete documentation index, see [llms.txt](https://docs.zenml.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.zenml.io/kitaru/core-concepts.md).

# Core Concepts

- [Overview](https://docs.zenml.io/kitaru/core-concepts/concepts.md): The mental model behind Kitaru's durable execution primitives.
- [Harness, Runtime, Platform](https://docs.zenml.io/kitaru/core-concepts/harness-runtime-platform.md): Where Kitaru fits — and doesn't — in an agent stack.
- [How It Works](https://docs.zenml.io/kitaru/core-concepts/how-it-works.md): What runs where when you execute a Kitaru flow — server, runner, execution targets, and the contract between them.
- [Flows](https://docs.zenml.io/kitaru/core-concepts/flows.md): Define durable execution boundaries for your AI agent workflows.
- [Deployments](https://docs.zenml.io/kitaru/core-concepts/deployments.md): Version and share durable flow entrypoints for remote invocation.
- [Checkpoints](https://docs.zenml.io/kitaru/core-concepts/checkpoints.md): Durable work units with persistence and concurrency support.
- [Wait, Input, and Resume](https://docs.zenml.io/kitaru/core-concepts/wait-and-input.md): Pause flows for human or agent input, then resume from where they left off.
- [Logging and Metadata](https://docs.zenml.io/kitaru/core-concepts/logging.md): Attach structured data to executions and checkpoints.


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