Move API code from user/ to agent/

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

src/agent/tools/mod.rs

@@ -5,13 +5,13 @@
 // working_stack) and delegates everything else to thought::dispatch.
 
 // Core tools
-pub mod bash;
-pub mod edit;
-pub mod glob;
-pub mod grep;
-pub mod memory;
-pub mod read;
-pub mod write;
+mod bash;
+mod edit;
+mod glob;
+mod grep;
+mod memory;
+mod read;
+mod write;
 
 // Agent-specific tools
 mod control;
@@ -53,6 +53,19 @@ pub struct ToolDef {
     pub function: FunctionDef,
 }
 
+impl ToolDef {
+    pub fn new(name: &str, description: &str, parameters: serde_json::Value) -> Self {
+        Self {
+            tool_type: "function".to_string(),
+            function: FunctionDef {
+                name: name.to_string(),
+                description: description.to_string(),
+                parameters,
+            },
+        }
+    }
+}
+
 /// A tool call requested by the model.
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct ToolCall {