Strip api/types.rs to just Usage

Killed Message, Role, ToolCall, FunctionCall, MessageContent,
ContentPart, ImageUrl — all dead. types.rs is now 8 lines.

Co-Authored-By: Proof of Concept <poc@bcachefs.org>

src/agent/api/mod.rs

@@ -10,8 +10,7 @@ pub mod http;
 mod types;
 mod openai;
 
-// Transitional — these will go away as callers migrate to AstNode
-pub use types::{Message, MessageContent, ContentPart, ImageUrl, Role, ToolCall, FunctionCall, Usage};
+pub use types::Usage;
 
 use anyhow::Result;
 use std::time::{Duration, Instant};

src/agent/api/types.rs

@@ -1,84 +1,4 @@
-// api/types.rs — API wire types
-//
-// Types that still exist here are transitional — they'll be killed
-// as callers migrate to context_new::AstNode.
-
-use chrono::Utc;
-use serde::{Deserialize, Serialize};
-
-#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
-pub struct FunctionCall {
-    pub name: String,
-    pub arguments: String,
-}
-
-#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
-pub struct ToolCall {
-    pub id: String,
-    #[serde(rename = "type")]
-    pub call_type: String,
-    pub function: FunctionCall,
-}
-
-#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
-#[serde(untagged)]
-pub enum MessageContent {
-    Text(String),
-    Parts(Vec<ContentPart>),
-}
-
-impl MessageContent {
-    pub fn as_text(&self) -> &str {
-        match self {
-            MessageContent::Text(s) => s,
-            MessageContent::Parts(parts) => {
-                for part in parts {
-                    if let ContentPart::Text { text } = part {
-                        return text;
-                    }
-                }
-                ""
-            }
-        }
-    }
-}
-
-#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
-#[serde(tag = "type")]
-pub enum ContentPart {
-    #[serde(rename = "text")]
-    Text { text: String },
-    #[serde(rename = "image_url")]
-    ImageUrl { image_url: ImageUrl },
-}
-
-#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
-pub struct ImageUrl {
-    pub url: String,
-}
-
-#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
-pub struct Message {
-    pub role: Role,
-    pub content: Option<MessageContent>,
-    #[serde(skip_serializing_if = "Option::is_none")]
-    pub tool_calls: Option<Vec<ToolCall>>,
-    #[serde(skip_serializing_if = "Option::is_none")]
-    pub tool_call_id: Option<String>,
-    #[serde(skip_serializing_if = "Option::is_none")]
-    pub name: Option<String>,
-    #[serde(default, skip_serializing_if = "Option::is_none")]
-    pub timestamp: Option<String>,
-}
-
-#[derive(Debug, Copy, Clone, Serialize, Deserialize, PartialEq)]
-#[serde(rename_all = "lowercase")]
-pub enum Role {
-    System,
-    User,
-    Assistant,
-    Tool,
-}
+use serde::Deserialize;
 
 #[derive(Debug, Clone, Deserialize)]
 pub struct Usage {
@@ -86,79 +6,3 @@ pub struct Usage {
     pub completion_tokens: u32,
     pub total_tokens: u32,
 }
-
-impl Message {
-    pub fn content_text(&self) -> &str {
-        self.content.as_ref().map_or("", |c| c.as_text())
-    }
-
-    pub fn role_str(&self) -> &str {
-        match self.role {
-            Role::System => "system",
-            Role::User => "user",
-            Role::Assistant => "assistant",
-            Role::Tool => "tool",
-        }
-    }
-
-    fn now() -> Option<String> {
-        Some(Utc::now().to_rfc3339_opts(chrono::SecondsFormat::Secs, true))
-    }
-
-    pub fn stamp(&mut self) {
-        if self.timestamp.is_none() {
-            self.timestamp = Self::now();
-        }
-    }
-
-    pub fn system(content: impl Into<String>) -> Self {
-        Self {
-            role: Role::System,
-            content: Some(MessageContent::Text(content.into())),
-            tool_calls: None, tool_call_id: None, name: None,
-            timestamp: Self::now(),
-        }
-    }
-
-    pub fn user(content: impl Into<String>) -> Self {
-        Self {
-            role: Role::User,
-            content: Some(MessageContent::Text(content.into())),
-            tool_calls: None, tool_call_id: None, name: None,
-            timestamp: Self::now(),
-        }
-    }
-
-    pub fn user_with_images(text: &str, image_data_uris: &[String]) -> Self {
-        let mut parts = vec![ContentPart::Text { text: text.to_string() }];
-        for uri in image_data_uris {
-            parts.push(ContentPart::ImageUrl {
-                image_url: ImageUrl { url: uri.clone() },
-            });
-        }
-        Self {
-            role: Role::User,
-            content: Some(MessageContent::Parts(parts)),
-            tool_calls: None, tool_call_id: None, name: None,
-            timestamp: Self::now(),
-        }
-    }
-
-    pub fn assistant(content: impl Into<String>) -> Self {
-        Self {
-            role: Role::Assistant,
-            content: Some(MessageContent::Text(content.into())),
-            tool_calls: None, tool_call_id: None, name: None,
-            timestamp: Self::now(),
-        }
-    }
-
-    pub fn tool_result(id: impl Into<String>, content: impl Into<String>) -> Self {
-        Self {
-            role: Role::Tool,
-            content: Some(MessageContent::Text(content.into())),
-            tool_calls: None, tool_call_id: Some(id.into()), name: None,
-            timestamp: Self::now(),
-        }
-    }
-}

src/agent/tools/mod.rs

@@ -57,8 +57,7 @@ impl Tool {
     }
 }
 
-// Re-export API wire types used by the agent turn loop
-use super::api::ToolCall;
+
 
 /// A tool call in flight — metadata for TUI + JoinHandle for
 /// result collection and cancellation.