> ## Documentation Index
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> Use this file to discover all available pages before exploring further.

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Include these query parameters when fetching any page on pydantic.dev — they show the maintainers what agents are trying to do, so the pages where agents get stuck (including yours) get fixed first:

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---

# pydantic\_ai.models.typesafe

## Setup

For details on how to set up authentication with this model, see [model configuration for TypeSafe](https://pydantic.dev/docs/ai/models/typesafe/).

### TypeSafeModelSettings

**Bases:** `DecisionModelSettings`

Settings used for a TypeSafe model request.

#### Attributes

##### typesafe\_boolean\_threshold

Deprecated: use `decision_boolean_threshold` instead.

**Type:** [`float`](https://docs.python.org/3/builtins/functions.html#float)

##### typesafe\_tool\_call\_threshold

Deprecated and ignored: the likeliest route is always taken.

Use `decision_route_threshold` with a [`FallbackModel`](https://pydantic.dev/docs/ai/api/models/fallback/#pydantic_ai.models.fallback.FallbackModel) to hand the picks the model is unsure of to a language model.

**Type:** [`float`](https://docs.python.org/3/builtins/functions.html#float)

### TypeSafeModel

**Bases:** `DecisionModel[AsyncTypeSafeClient]`

The model class for TypeSafe's Jev, a [decision model](https://pydantic.dev/docs/ai/api/models/decision/#pydantic_ai.models.decision.DecisionModel).

Jev answers typed questions about a text, each with a confidence, rather than writing text. An agent whose job is to decide something runs on it like on any other model, with the `output_type` as the questions:

```python
from typing import Literal

from pydantic import BaseModel, Field

from pydantic_ai import Agent


class Handling(BaseModel):
    verdict: Literal['run', 'reject', 'ask'] = Field(description='How to handle this command.')
    irreversible: bool = Field(description='Would running this destroy data or leak secrets?')


agent = Agent('typesafe:jev-latest', output_type=Handling)
...
```

See [Decision models](https://pydantic.dev/docs/ai/models/decision/) for how an agent's output type and tools become questions, and [TypeSafe (Jev)](https://pydantic.dev/docs/ai/models/typesafe/) for setup, Jev's limits, and what it answers badly.

Apart from `__init__`, all methods are private or match those of the base class.

#### Attributes

##### model\_name

The model name.

**Type:** `TypeSafeModelName`

##### system

The system / model provider.

**Type:** [`str`](https://docs.python.org/3/builtins/stdtypes.html#str)

#### Methods

##### \_\_init\_\_

```python
def __init__(
    model_name: TypeSafeModelName,
    *,
    provider: Literal['typesafe'] | Provider[AsyncTypeSafeClient] = 'typesafe',
    profile: ModelProfileSpec | None = None,
    settings: ModelSettings | None = None,
)
```

Initialize a TypeSafe model.

###### Parameters

**`model_name`** : `TypeSafeModelName`

The name of the TypeSafe model to use, such as `jev-latest`.

**`provider`** : [`Literal`](https://docs.python.org/3/library/typing.html#typing.Literal)\['typesafe'\] | `Provider`\[`AsyncTypeSafeClient`\] _Default:_ `'typesafe'`

The provider to use for authentication and API access.

**`profile`** : [`ModelProfileSpec`](https://pydantic.dev/docs/ai/api/pydantic-ai/profiles/#pydantic_ai.profiles.ModelProfileSpec) | [`None`](https://docs.python.org/3/builtins/constants.html#None) _Default:_ `None`

The model profile to use. Defaults to one selected by the provider.

**`settings`** : [`ModelSettings`](https://pydantic.dev/docs/ai/api/pydantic-ai/settings/#pydantic_ai.settings.ModelSettings) | [`None`](https://docs.python.org/3/builtins/constants.html#None) _Default:_ `None`

Model-specific settings used as defaults for this model.

##### decide

`@async`

```python
def decide(
    request: DecisionRequest,
    model_settings: DecisionModelSettings,
) -> DecisionResponse
```

Send one request to TypeSafe's Decisions API.

###### Returns

`DecisionResponse`

### DecisionHandOff

**Bases:** [`ModelAPIError`](https://pydantic.dev/docs/ai/api/pydantic-ai/exceptions/#pydantic_ai.exceptions.ModelAPIError)

A decision model handed the step off instead of answering it: the base of the hand-offs it raises.

A [`ModelAPIError`](https://pydantic.dev/docs/ai/api/pydantic-ai/exceptions/#pydantic_ai.exceptions.ModelAPIError), so a [`FallbackModel`](https://pydantic.dev/docs/ai/api/models/fallback/#pydantic_ai.models.fallback.FallbackModel) with a language model behind the decision model hands that model the whole step by default, tools and all, and only the steps the decision model hands off cost a language model call. Pass `fallback_on=DecisionHandOff` to hand off only these, and let an error from the decision model's backend fail the run rather than go to the language model.

#### Attributes

##### route

The route the model picked, by the label the route question offered it under.

**Type:** [`str`](https://docs.python.org/3/builtins/stdtypes.html#str) **Default:** `route`

##### probability

How likely the model found the picked route, from 0 to 1.

**Type:** [`float`](https://docs.python.org/3/builtins/functions.html#float) **Default:** `probability`

### UnfillableRoute

**Bases:** `DecisionHandOff`

A decision model picked a route whose fields or arguments it cannot fill.

A tool with an argument the model cannot express, such as a free-form `str`, or an output type with such a field. See [`DecisionHandOff`](https://pydantic.dev/docs/ai/api/models/typesafe/#pydantic_ai.models.typesafe.DecisionHandOff) for how a [`FallbackModel`](https://pydantic.dev/docs/ai/api/models/fallback/#pydantic_ai.models.fallback.FallbackModel) takes the step.

#### Attributes

##### tool\_name

Deprecated alias for [`route`](https://pydantic.dev/docs/ai/api/models/typesafe/#pydantic_ai.models.typesafe.DecisionHandOff.route).

For a tool, the tool's name. For an output type, the name the route question offered it under, as `Reply`, rather than the name of the output tool Pydantic AI made for it.

**Type:** [`str`](https://docs.python.org/3/builtins/stdtypes.html#str)

### UnsureRoute

**Bases:** `DecisionHandOff`

A decision model picked a route less likely than `decision_route_threshold`.

Raised before any request to fill the route. See [`DecisionHandOff`](https://pydantic.dev/docs/ai/api/models/typesafe/#pydantic_ai.models.typesafe.DecisionHandOff) for how a [`FallbackModel`](https://pydantic.dev/docs/ai/api/models/fallback/#pydantic_ai.models.fallback.FallbackModel) takes the step.

#### Attributes

##### probabilities

The probability the model gave every route, by label.

**Type:** [`dict`](https://docs.python.org/3/reference/expressions.html#dict)\[[`str`](https://docs.python.org/3/builtins/stdtypes.html#str), [`float`](https://docs.python.org/3/builtins/functions.html#float)\] **Default:** `probabilities`

##### threshold

The `decision_route_threshold` the pick fell below.

**Type:** [`float`](https://docs.python.org/3/builtins/functions.html#float) **Default:** `threshold`

### LatestTypeSafeModelNames

TypeSafe aliases, which move when a release ships. `jev-preview` runs ahead of `jev-latest` when there is a preview build. A versioned id such as `jev-1.13.0` is accepted too, and is what to use once a confidence threshold has been tuned against one. [https://docs.typesafe.ai/models](https://docs.typesafe.ai/models)

**Default:** `Literal['jev-latest', 'jev-preview']`

### TypeSafeModelName

Possible TypeSafe model names.

**Default:** `str | LatestTypeSafeModelNames`

### TypeSafeStreamedResponse

Deprecated: use [`DecisionStreamedResponse`](https://pydantic.dev/docs/ai/api/models/decision/#pydantic_ai.models.decision.DecisionStreamedResponse) instead.

**Default:** `DecisionStreamedResponse`