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

Cross-cutting policy enforcement plugin for inbound AI/runtime signals.

## Enforce Mode Behavior

`mode` controls whether policy violations rewrite request/query signals:

- `mode: :enforce` rewrites violating request/query signals to `ai.request.error`.
- `mode: :monitor` allows request/query signals to continue unchanged.

Rewrite behavior only applies when `block_on_validation_error: true`.

## Rewrite Semantics

For enforceable signal types (`chat.*`, `ai.*.query`, and
`reasoning.*.run`), the plugin validates prompt/query text with
`Jido.AI.Validation.validate_prompt/1`.

Validation failures are rewritten to `ai.request.error` with:

- `reason: :policy_violation`
- `message: "request blocked by policy"`
- `request_id` resolved from request/call correlation data when present

## Normalization And Sanitization Contracts

- `ai.llm.response` and `ai.tool.result` normalize `data.result` into
  `{:ok, result, effects}` or `{:error, reason, effects}` tuples.
- `ai.llm.delta` sanitizes text in `data.delta` by removing control bytes
  and truncating to `max_delta_chars` (default `4_000`). Typed content parts
  pass through unchanged.

# `__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*