feat: add title field for data types (#410)

* feat(model): add title field to various structs

* fix(test): fix test json schema

* fix(model): allow boxed type  in `ts_union` macro

crates/rmcp/src/model/content.rs

@@ -66,7 +66,7 @@ pub enum RawContent {
     Text(RawTextContent),
     Image(RawImageContent),
     Resource(RawEmbeddedResource),
-    Audio(AudioContent),
+    Audio(RawAudioContent),
     ResourceLink(super::resource::RawResource),
 }
 
@@ -253,6 +253,7 @@ mod tests {
         let resource_link = RawContent::ResourceLink(RawResource {
             uri: "file:///test.txt".to_string(),
             name: "test.txt".to_string(),
+            title: None,
             description: Some("A test file".to_string()),
             mime_type: Some("text/plain".to_string()),
             size: Some(100),

crates/rmcp/src/model/prompt.rs

@@ -14,6 +14,8 @@ use super::{
 pub struct Prompt {
     /// The name of the prompt
     pub name: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub title: Option<String>,
     /// Optional description of what the prompt does
     #[serde(skip_serializing_if = "Option::is_none")]
     pub description: Option<String>,
@@ -35,6 +37,7 @@ impl Prompt {
     {
         Prompt {
             name: name.into(),
+            title: None,
             description: description.map(Into::into),
             arguments,
         }
@@ -47,6 +50,9 @@ impl Prompt {
 pub struct PromptArgument {
     /// The name of the argument
     pub name: String,
+    /// A human-readable title for the argument
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub title: Option<String>,
     /// A description of what the argument is used for
     #[serde(skip_serializing_if = "Option::is_none")]
     pub description: Option<String>,

crates/rmcp/src/model/resource.rs

@@ -11,6 +11,9 @@ pub struct RawResource {
     pub uri: String,
     /// Name of the resource
     pub name: String,
+    /// Human-readable title of the resource
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub title: Option<String>,
     /// Optional description of the resource
     #[serde(skip_serializing_if = "Option::is_none")]
     pub description: Option<String>,
@@ -34,6 +37,8 @@ pub struct RawResourceTemplate {
     pub uri_template: String,
     pub name: String,
     #[serde(skip_serializing_if = "Option::is_none")]
+    pub title: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub description: Option<String>,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub mime_type: Option<String>,
@@ -82,6 +87,7 @@ impl RawResource {
         Self {
             uri: uri.into(),
             name: name.into(),
+            title: None,
             description: None,
             mime_type: None,
             size: None,
@@ -99,6 +105,7 @@ mod tests {
     fn test_resource_serialization() {
         let resource = RawResource {
             uri: "file:///test.txt".to_string(),
+            title: None,
             name: "test".to_string(),
             description: Some("Test resource".to_string()),
             mime_type: Some("text/plain".to_string()),

crates/rmcp/src/model/tool.rs

@@ -15,6 +15,9 @@ use super::JsonObject;
 pub struct Tool {
     /// The name of the tool
     pub name: Cow<'static, str>,
+    /// A human-readable title for the tool
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub title: Option<String>,
     /// A description of what the tool does
     #[serde(skip_serializing_if = "Option::is_none")]
     pub description: Option<Cow<'static, str>>,
@@ -138,6 +141,7 @@ impl Tool {
     {
         Tool {
             name: name.into(),
+            title: None,
             description: Some(description.into()),
             input_schema: input_schema.into(),
             output_schema: None,