> Fetch clean Markdown by appending `.md` to any page URL under https://signalwire.com/docs or requesting it with the HTTP header `Accept: text/markdown`. The root index at https://signalwire.com/docs/llms.txt lists the available documentation indexes.

# validate

> Validate the entire context configuration tree.

Validate the entire context configuration. Called automatically during SWML
rendering, but can be called manually to catch errors early.

Checks performed:

* At least one context exists.
* A single context is named `"default"`.
* Every context has at least one step.
* Each context's `initial_step` (if set) references a real step in that context.
* All context-level `valid_contexts` references point to contexts that exist in the builder.
* All step-level `valid_steps` references point to real step names (or the literal `"next"`) in the same context.
* All step-level `valid_contexts` references point to contexts that exist in the builder.
* All `gather_info` question keys are unique within a single step.
* All `gather_info` `completion_action` targets point to `"next_step"` or a real step in the same context.
* No user-defined SWAIG tool collides with the reserved native tool names (`next_step`, `change_context`, `gather_submit`).

## **Returns**

`void` -- Throws `Error` with a descriptive message if validation fails.

## **Example**

```typescript {8}
import { ContextBuilder } from '@signalwire/sdk';

const builder = new ContextBuilder();
const ctx = builder.addContext('default');
ctx.addStep('greet').setText('Hello!');

try {
  builder.validate();
} catch (e) {
  console.log(`Invalid context config: ${e}`);
}
```

> Validate the entire context configuration tree.