> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.nvidia.com/nemo/relay/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.nvidia.com/nemo/relay/_mcp/server.

# Enum Message

> A single message in a conversation, tagged by role.

Generated from `cargo doc --no-deps -p nemo-relay -p nemo-relay-adaptive -p nemo-relay-pii-redaction -p nemo-relay-ffi -p nemo-relay-types -p nemo-relay-plugin -p nemo-relay-worker-proto -p nemo-relay-worker`.

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A single message in a conversation, tagged by role.

## Variants

### `System`

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A system instruction message.

#### Fields

### `content: MessageContent`

The message content.

### `name: Option<String>`

Optional sender name.

### `User`

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A user message.

#### Fields

### `content: MessageContent`

The message content.

### `name: Option<String>`

Optional sender name.

### `Developer`

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A developer instruction message used by OpenAI APIs.

#### Fields

### `content: MessageContent`

The message content.

### `name: Option<String>`

Optional sender name.

### `Assistant`

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An assistant response, optionally containing tool calls.

#### Fields

### `content: Option<MessageContent>`

The message content (optional - may be absent when tool calls are present).

### `tool_calls: Option<Vec<ToolCall>>`

Tool calls requested by the assistant.

### `name: Option<String>`

Optional sender name.

### `Tool`

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A tool result message.

#### Fields

### `content: MessageContent`

The tool execution result.

### `tool_call_id: String`

The ID of the tool call this result corresponds to.

### `Function`

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A legacy OpenAI function-result message.

#### Fields

### `content: Option<String>`

The function result. OpenAI permits an explicit null value.

### `name: String`

Function name.

### `ToolCallItem`

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A portable top-level tool-call item, primarily used by OpenAI Responses.

#### Fields

### `id: Option<String>`

Optional provider item ID.

### `call_id: String`

Provider call ID used to correlate the result.

### `name: String`

Tool/function name.

### `arguments: Value`

Parsed tool arguments.

### `extra: Map<String, Value>`

Provider fields without portable semantics.

### `ToolResultItem`

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A portable top-level tool-result item, primarily used by OpenAI Responses.

#### Fields

### `id: Option<String>`

Optional provider item ID.

### `call_id: String`

Provider call ID used to correlate the result.

### `output: Value`

Provider result payload.

### `extra: Map<String, Value>`

Provider fields without portable semantics.

### `ProviderNative`

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Lossless provider-native request item.

#### Fields

### `provider: String`

Provider surface that owns the value.

### `kind: String`

Native discriminator or a descriptive fallback.

### `value: Value`

Exact provider JSON value.

## Trait Implementations

### `impl Clone for Message`

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#### `clone`

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#### `clone_from`

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### `impl Debug for Message`

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#### `fmt`

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### `impl<'de> Deserialize<'de> for Message`

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#### `deserialize`

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### `impl PartialEq for Message`

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#### `eq`

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#### `ne`

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### `impl Serialize for Message`

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#### `serialize`

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### `impl StructuralPartialEq for Message`

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