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# setParam

> Set a single AI parameter by key.

[ref-agentbase]: /docs/server-sdks/reference/typescript/agents/agent-base

Set a single AI parameter by key.

## **Parameters**

**`key`** `string` — required

Parameter name (e.g., `"temperature"`, `"end_of_speech_timeout"`).

---

**`value`** `unknown` — required

Parameter value. Type depends on the parameter being set.

---

## **Returns**

[`AgentBase`][ref-agentbase] -- Returns `this` for method chaining.

## **Example**

```typescript {5}
import { AgentBase } from '@signalwire/sdk';

const agent = new AgentBase({ name: 'support', route: '/support' });
agent.setPromptText('You are a helpful assistant.');
agent.setParam('temperature', 0.5);
await agent.serve();
```

> Set a single AI parameter by key.