# encodeModelProvider

URL: https://tailrace.dev/docs/reference/ai-sdk/encode-model-provider

> Encode a LanguageModelV2 as a policy boundary provider string.



Convert an AI SDK model's `provider` and `modelId` into the string used in `{ kind: "model", provider }` boundaries and policy glob keys.

## Import [#import]

```ts
import { encodeModelProvider } from "@tailrace/ai-sdk";
```

## Signature [#signature]

```ts
function encodeModelProvider(model: Pick<LanguageModelV2, "provider" | "modelId">): string;
```

## Returns [#returns]

| Input                                      | Output                    |
| ------------------------------------------ | ------------------------- |
| `provider: "openai"`, `modelId: "gpt-4o"`  | `"openai/gpt-4o"`         |
| `modelId: "openai/gpt-4o"` (gateway-style) | `"openai/gpt-4o"`         |
| `modelId: ""`                              | `provider` or `"unknown"` |

## Use in policy [#use-in-policy]

```ts
definePolicy({
  boundaries: {
    "openai/*": { entities: { email: "tokenize" } },
    "openai/gpt-4o-mini": { entities: { email: "allow" } },
  },
});
```

Exact keys beat globs. Model globs do not match tool or MCP boundary keys.

## Example [#example]

```ts
encodeModelProvider({ provider: "openai", modelId: "gpt-4o" });
// "openai/gpt-4o"
```

## Related [#related]

* [wrapModel](/docs/reference/ai-sdk/wrap-model)