> ## Documentation Index
> Fetch the complete documentation index at: https://docs.verial.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Overview

> Resources available in the Verial API.

| Resource                                                  | Description                                                               |
| --------------------------------------------------------- | ------------------------------------------------------------------------- |
| [Environments](/api-reference/resources/environments)     | Simulated health systems composed of linked simulators                    |
| [Simulators](/api-reference/resources/simulators)         | Reusable simulator definitions (FHIR, HL7, Voice, Fax, Portal, X12, SFTP) |
| [Datasets](/api-reference/resources/datasets)             | Synthetic patient data (FHIR bundles, files, portal state)                |
| [Benchmarks](/api-reference/resources/benchmarks)         | Groups of tasks with criteria that the verification engine runs           |
| [Tasks](/api-reference/resources/tasks)                   | Individual test cases within benchmarks                                   |
| [Criteria](/api-reference/resources/criteria)             | Typed assertions on tasks, scored by the verification engine              |
| [Criterion Runs](/api-reference/resources/criterion-runs) | Per-criterion results within a task run                                   |
| [Playgrounds](/api-reference/resources/playgrounds)       | Running environment instances with live sandboxes                         |
| [Sandboxes](/api-reference/resources/sandboxes)           | Running simulator instances with credentials                              |
| [Benchmark Runs](/api-reference/resources/runs)           | Benchmark executions with scores and verdicts                             |
| [Task Runs](/api-reference/resources/task-runs)           | Task-level results within a benchmark run                                 |

For how these resources relate to each other, see [Core Concepts](/guides/index).