diff --git a/README.md b/README.md
index b0d7165..1a3df33 100644
--- a/README.md
+++ b/README.md
@@ -309,7 +309,7 @@ Support [tool use](https://docs.anthropic.com/en/docs/build-with-claude/tool-use
 
 When you define a tool as Rust function with documentation comment like this:
 
-```rust,no_run
+```txt
 /// Get the current weather in a given location
 ///
 /// ## Arguments
@@ -321,7 +321,7 @@ fn get_weather(location: String) -> String {
 
 you can use the `clust::clust_macros::clust_tool` attribute macro with `macros` feature flag to generate code:
 
-```rust,no_run
+```txt
 /// Get the current weather in a given location
 ///
 /// ## Arguments
@@ -334,19 +334,19 @@ fn get_weather(location: String) -> String {
 
 and create an instance of `clust::messages::Tool` that named by `ClustTool_{function_name}` from the function:
 
-```rust,no_run
+```txt
 let tool = ClustTool_get_weather {};
 ```
 
 Get the tool definition from `clust::messages::Tool` for API request:
 
-```rust,no_run
+```txt
 let tool_definition = tool.definition();
 ```
 
 and call the tool with tool use got from the API response:
 
-```rust,no_run
+```txt
 let tool_result = tool.call(tool_use);
 ```
 
diff --git a/src/lib.rs b/src/lib.rs
index 83f7177..3f5955a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -290,7 +290,7 @@
 //!
 //! you can use the `clust::clust_macros::clust_tool` attribute macro with `macros` feature flag to generate code:
 //!
-//! ```rust,no_run
+//! ```txt
 //! /// Get the current weather in a given location
 //! ///
 //! /// ## Arguments
@@ -303,19 +303,19 @@
 //!
 //! and create an instance of `clust::messages::Tool` that named by `ClustTool_{function_name}` from the function:
 //!
-//! ```rust,no_run
+//! ```txt
 //! let tool = ClustTool_get_weather {};
 //! ```
 //!
 //! Get the tool definition from `clust::messages::Tool` for API request:
 //!
-//! ```rust,no_run
+//! ```txt
 //! let tool_definition = tool.definition();
 //! ```
 //!
 //! and call the tool with tool use got from the API response:
 //!
-//! ```rust,no_run
+//! ```txt
 //! let tool_result = tool.call(tool_use);
 //! ```
 //!
diff --git a/src/messages/content.rs b/src/messages/content.rs
index 94ce7ef..b273acd 100644
--- a/src/messages/content.rs
+++ b/src/messages/content.rs
@@ -1700,12 +1700,12 @@ mod tests {
 
         assert_eq!(
             Content::from(vec![
+                ContentBlock::from("text"),
                 ContentBlock::from(ToolUse::new(
                     "id",
                     "name",
                     serde_json::Value::Object(serde_json::Map::new())
                 )),
-                ContentBlock::from("text"),
             ])
             .flatten_into_tool_use()
             .unwrap(),