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//! Content parts shared between user-facing and provider-facing messages.
use serde::{Deserialize, Serialize};
use serde_json::Value;
use ts_rs::TS;
/// A part of a multi-part message.
///
/// Shared between `ModelMessage` (user-facing) and `LanguageModelPrompt` (provider-facing).
#[derive(Debug, Clone, Serialize, Deserialize, TS)]
#[serde(tag = "type", rename_all = "snake_case")]
#[ts(export)]
pub enum ContentPart {
/// A text segment.
Text {
text: String,
/// Provider-specific options for this part (e.g. `openai.promptCacheBreakpoint`).
#[serde(default, skip_serializing_if = "Option::is_none")]
provider_options: Option<Value>,
},
/// An image (raw bytes + MIME type).
Image {
image: Vec<u8>,
media_type: String,
#[serde(default, skip_serializing_if = "Option::is_none")]
provider_options: Option<Value>,
},
/// A file (raw bytes + MIME type).
File {
data: Vec<u8>,
media_type: String,
#[serde(default, skip_serializing_if = "Option::is_none")]
filename: Option<String>,
#[serde(default, skip_serializing_if = "Option::is_none")]
provider_options: Option<Value>,
},
/// A file whose inline data is an already-base64-encoded string.
///
/// Mirrors the Vercel AI SDK `file` part with `data: { type: 'data', data:
/// '<base64>' }`: the `data` field holds the raw base64 string verbatim
/// (it is NOT decoded into bytes), so it round-trips through providers that
/// emit a `base64` source unchanged.
FileBase64 {
data: String,
media_type: String,
#[serde(default, skip_serializing_if = "Option::is_none")]
filename: Option<String>,
#[serde(default, skip_serializing_if = "Option::is_none")]
provider_options: Option<Value>,
},
/// A file referenced by URL.
///
/// Mirrors the Vercel AI SDK `file` part with `data: { type: 'url', url }`.
FileUrl {
url: String,
media_type: String,
#[serde(default, skip_serializing_if = "Option::is_none")]
provider_options: Option<Value>,
},
/// A file referenced by a provider-specific reference (e.g. an OpenAI file ID).
///
/// Mirrors the Vercel AI SDK `file` part with `data: { type: 'reference',
/// reference: { openai: 'file-xxx' } }`. The `reference` field is a JSON
/// object keyed by provider name.
FileReference {
media_type: String,
reference: Value,
#[serde(default, skip_serializing_if = "Option::is_none")]
filename: Option<String>,
#[serde(default, skip_serializing_if = "Option::is_none")]
provider_options: Option<Value>,
},
/// A reasoning / thinking segment produced by the model.
///
/// Mirrors the Vercel AI SDK `reasoning` part. `signature` is the Anthropic
/// thinking-block signature (from `providerOptions.anthropic.signature`);
/// when absent the part is treated as having unsupported metadata (unless
/// `providerOptions.anthropic.redactedData` is present, in which case a
/// `redacted_thinking` block is emitted).
Reasoning {
text: String,
signature: Option<String>,
/// Provider-specific options for this part (e.g.
/// `anthropic.signature`, `anthropic.redactedData`,
/// `anthropic.cacheControl`).
#[serde(default, skip_serializing_if = "Option::is_none")]
provider_options: Option<Value>,
},
/// A tool call requested by the model.
ToolCall {
tool_call_id: String,
tool_name: String,
/// Arguments as a JSON value (usually an object).
input: Value,
/// Provider-specific options for this part (e.g.
/// `anthropic.cacheControl`).
#[serde(default, skip_serializing_if = "Option::is_none")]
provider_options: Option<Value>,
},
/// The result of executing a tool call.
ToolResult {
tool_call_id: String,
/// The tool's output (usually a JSON value or plain text).
result: Value,
/// The name of the tool that produced this result (optional on the
/// user-input side; providers that need it can look it up from the
/// preceding tool call).
#[serde(default, skip_serializing_if = "Option::is_none")]
tool_name: Option<String>,
/// Whether the result is an error or error message.
#[serde(default, skip_serializing_if = "Option::is_none")]
is_error: Option<bool>,
/// Whether the result is preliminary (replaces prior, e.g. image previews).
#[serde(default, skip_serializing_if = "Option::is_none")]
preliminary: Option<bool>,
/// Whether the tool is dynamic (defined at runtime, e.g. MCP tools).
#[serde(default, skip_serializing_if = "Option::is_none")]
dynamic: Option<bool>,
/// Provider-specific options for this part (e.g.
/// `anthropic.cacheControl`).
#[serde(default, skip_serializing_if = "Option::is_none")]
provider_options: Option<Value>,
},
}
impl ContentPart {
/// Convenience constructor for a text part (no provider options).
pub fn text(text: impl Into<String>) -> Self {
ContentPart::Text {
text: text.into(),
provider_options: None,
}
}
/// Convenience constructor for a tool-call part (no provider options).
pub fn tool_call(
tool_call_id: impl Into<String>,
tool_name: impl Into<String>,
input: Value,
) -> Self {
ContentPart::ToolCall {
tool_call_id: tool_call_id.into(),
tool_name: tool_name.into(),
input,
provider_options: None,
}
}
/// Convenience constructor for a tool-result part (no provider options).
pub fn tool_result(tool_call_id: impl Into<String>, result: Value) -> Self {
ContentPart::ToolResult {
tool_call_id: tool_call_id.into(),
result,
tool_name: None,
is_error: None,
preliminary: None,
dynamic: None,
provider_options: None,
}
}
/// Convenience constructor for a reasoning/thinking part (no provider
/// options, no signature).
pub fn reasoning(text: impl Into<String>) -> Self {
ContentPart::Reasoning {
text: text.into(),
signature: None,
provider_options: None,
}
}
/// Convenience constructor for an image part (no provider options).
pub fn image(image: Vec<u8>, media_type: impl Into<String>) -> Self {
ContentPart::Image {
image,
media_type: media_type.into(),
provider_options: None,
}
}
/// Convenience constructor for a file part (no provider options, no filename).
pub fn file(data: Vec<u8>, media_type: impl Into<String>) -> Self {
ContentPart::File {
data,
media_type: media_type.into(),
filename: None,
provider_options: None,
}
}
/// Convenience constructor for a base64-encoded file part (no provider
/// options, no filename).
pub fn file_base64(data: impl Into<String>, media_type: impl Into<String>) -> Self {
ContentPart::FileBase64 {
data: data.into(),
media_type: media_type.into(),
filename: None,
provider_options: None,
}
}
/// Convenience constructor for a URL-referenced file part (no provider options).
pub fn file_url(url: impl Into<String>, media_type: impl Into<String>) -> Self {
ContentPart::FileUrl {
url: url.into(),
media_type: media_type.into(),
provider_options: None,
}
}
/// Convenience constructor for a provider-referenced file part (no provider
/// options, no filename).
pub fn file_reference(media_type: impl Into<String>, reference: Value) -> Self {
ContentPart::FileReference {
media_type: media_type.into(),
reference,
filename: None,
provider_options: None,
}
}
}