---
title: "Client SDKs"
description: "Language-specific clients generated from the Arc OpenAPI spec"
---

The Arc API is defined by an OpenAPI 3.1 specification (`docs/api-reference/arc-api.yaml` in the repository) that serves as the single source of truth for all endpoints, request/response schemas, and parameter definitions. The spec is also available at runtime from the server at `GET /openapi.json`. Both client SDKs below are generated directly from this spec.

## TypeScript (Axios)

The `@qltysh/arc-api-client` package is a fully typed HTTP client generated with the [OpenAPI Generator](https://openapi-generator.tech/) using the `typescript-axios` template. It produces typed API classes (one per tag) and model interfaces for every schema.

### Regenerating

From the repository root:

```bash
cd packages/arc-api-client
bun run generate
```

This runs `openapi-generator-cli` against `docs/api-reference/arc-api.yaml` and writes the generated source into `packages/arc-api-client/src/`.

### Usage

```typescript
import { RunsApi, Configuration } from "@qltysh/arc-api-client";

const config = new Configuration({ basePath: "http://localhost:3000" });
const runs = new RunsApi(config);

const { data } = await runs.listRuns();
console.log(data);
```

The generated client includes a typed API class for each endpoint group: `RunsApi`, `WorkflowsApi`, `SessionsApi`, `VerificationsApi`, `InsightsApi`, and others.

## Rust (Types Only)

The `arc-types` crate generates Rust structs and enums from the OpenAPI component schemas at compile time using [typify](https://github.com/oxidecomputer/typify). This provides type-safe representations of all API models but does not include an HTTP client.

### How It Works

A `build.rs` script reads `docs/api-reference/arc-api.yaml`, extracts `components/schemas`, and feeds them to typify. The generated code is written to `OUT_DIR` and included via:

```rust
// crates/arc-types/src/lib.rs
include!(concat!(env!("OUT_DIR"), "/openapi_types.rs"));
```

### Regenerating

The types are regenerated automatically on every `cargo build` when the OpenAPI spec changes:

```bash
cargo build -p arc-types
```

### Usage

```rust
use arc_types::RunListItem;
```

All generated types derive `serde::Deserialize` and `serde::Serialize`, so they work directly with any Rust HTTP client for request and response parsing.