# `Jido.AI.Plugins.ModelRouting`
[🔗](https://github.com/agentjido/jido_ai/blob/v2.4.0/lib/jido_ai/plugins/model_routing.ex#L1)

Cross-cutting model routing plugin.

Applies default model aliases by signal intent while respecting explicit
request-level model overrides.

## Route Precedence

Route selection follows deterministic precedence:

1. Exact signal type route (for example, `"chat.message"`)
2. Wildcard pattern route (for example, `"reasoning.*.run"`)

If the inbound payload already includes `:model` (or `"model"`), the plugin
bypasses routing and preserves the explicit model choice.

## Wildcard Contracts

Wildcard routes use `*` as a single dot-delimited segment matcher.

- `"reasoning.*.run"` matches `"reasoning.cot.run"` and `"reasoning.tot.run"`
- `"reasoning.*.run"` does not match `"reasoning.cot.worker.run"`

## Usage

`Jido.AI.Agent` includes this plugin in its default runtime stack. To apply
production-specific routing, provide an explicit plugin config:

```elixir
use Jido.AI.Agent,
  name: "assistant",
  plugins: [
    {Jido.AI.Plugins.ModelRouting,
     %{
       routes: %{
         "chat.message" => :capable,
         "chat.simple" => :fast,
         "chat.generate_object" => :thinking,
         "reasoning.*.run" => :reasoning
       }
     }}
  ]
```

# `__plugin_metadata__`

```elixir
@spec __plugin_metadata__() :: map()
```

Returns metadata for Jido.Discovery integration.

This function is used by `Jido.Discovery` to index plugins
for fast lookup and filtering.

# `actions`

```elixir
@spec actions() :: [module()]
```

Returns the list of action modules provided by this plugin.

# `capabilities`

```elixir
@spec capabilities() :: [atom()]
```

Returns the capabilities provided by this plugin.

# `category`

```elixir
@spec category() :: String.t() | nil
```

Returns the plugin's category.

# `config_schema`

```elixir
@spec config_schema() :: Zoi.schema() | nil
```

Returns the Zoi schema for per-agent configuration.

# `description`

```elixir
@spec description() :: String.t() | nil
```

Returns the plugin's description.

# `manifest`

```elixir
@spec manifest() :: Jido.Plugin.Manifest.t()
```

Returns the plugin manifest with all metadata.

The manifest provides compile-time metadata for discovery
and introspection, including capabilities, requirements,
signal routes, and schedules.

# `name`

```elixir
@spec name() :: String.t()
```

Returns the plugin's name.

# `otp_app`

```elixir
@spec otp_app() :: atom() | nil
```

Returns the OTP application for config resolution.

# `plugin_spec`

```elixir
@spec plugin_spec(map()) :: Jido.Plugin.Spec.t()
```

Returns the plugin specification with optional per-agent configuration.

## Examples

    spec = MyModule.plugin_spec(%{})
    spec = MyModule.plugin_spec(%{custom_option: true})

# `requires`

```elixir
@spec requires() :: [tuple()]
```

Returns the requirements for this plugin.

# `schedules`

```elixir
@spec schedules() :: [tuple()]
```

Returns the schedules for this plugin.

# `schema`

```elixir
@spec schema() :: Zoi.schema() | nil
```

Returns the Zoi schema for plugin state.

# `signal_patterns`

```elixir
@spec signal_patterns() :: [String.t()]
```

Returns the signal patterns this plugin handles.

# `signal_routes`

```elixir
@spec signal_routes() :: [tuple()]
```

Returns the signal routes for this plugin.

# `singleton?`

```elixir
@spec singleton?() :: boolean()
```

Returns whether this plugin is a singleton.

# `state_key`

```elixir
@spec state_key() :: atom()
```

Returns the key used to store plugin state in the agent.

# `subscriptions`

```elixir
@spec subscriptions() :: [Jido.Plugin.sensor_subscription()]
```

Returns the sensor subscriptions for this plugin.

# `tags`

```elixir
@spec tags() :: [String.t()]
```

Returns the plugin's tags.

# `vsn`

```elixir
@spec vsn() :: String.t() | nil
```

Returns the plugin's version.

---

*Consult [api-reference.md](api-reference.md) for complete listing*