chore(deps): update schemars requirement from 0.8 to 0.9

crates/rmcp/Cargo.toml

@@ -28,7 +28,7 @@ paste = { version = "1", optional = true }
 oauth2 = { version = "5.0", optional = true }
 
 # for auto generate schema
-schemars = { version = "0.8", optional = true, features = ["chrono"] }
+schemars = { version = "0.9", optional = true }
 
 # for image encoding
 base64 = { version = "0.22", optional = true }
@@ -134,7 +134,7 @@ schemars = ["dep:schemars"]
 
 [dev-dependencies]
 tokio = { version = "1", features = ["full"] }
-schemars = { version = "0.8" }
+schemars = { version = "0.9", features = ["chrono04"] }
 
 anyhow = "1.0"
 tracing-subscriber = { version = "0.3", features = [

crates/rmcp/src/handler/server/tool.rs

@@ -3,7 +3,7 @@ use std::{
 };
 
 use futures::future::BoxFuture;
-use schemars::JsonSchema;
+use schemars::{JsonSchema, transform::AddNullable};
 use serde::{Deserialize, Serialize, de::DeserializeOwned};
 use tokio_util::sync::CancellationToken;
 
@@ -14,12 +14,11 @@ use crate::{
 };
 /// A shortcut for generating a JSON schema for a type.
 pub fn schema_for_type<T: JsonSchema>() -> JsonObject {
-    let mut settings = schemars::r#gen::SchemaSettings::default();
-    settings.option_nullable = true;
-    settings.option_add_null_type = false;
-    settings.definitions_path = "#/components/schemas/".to_owned();
+    let mut settings = schemars::generate::SchemaSettings::default();
+
+    settings.definitions_path = Cow::Borrowed("#/components/schemas/");
     settings.meta_schema = None;
-    settings.visitors = Vec::default();
+    settings.transforms = vec![Box::new(AddNullable::default())];
     settings.inline_subschemas = false;
     let generator = settings.into_generator();
     let schema = generator.into_root_schema_for::<T>();
@@ -180,11 +179,11 @@ pub struct Parameter<K: ConstString, V>(pub K, pub V);
 pub struct Parameters<P>(pub P);
 
 impl<P: JsonSchema> JsonSchema for Parameters<P> {
-    fn schema_name() -> String {
+    fn schema_name() -> Cow<'static, str> {
         P::schema_name()
     }
 
-    fn json_schema(generator: &mut schemars::r#gen::SchemaGenerator) -> schemars::schema::Schema {
+    fn json_schema(generator: &mut schemars::SchemaGenerator) -> schemars::Schema {
         P::json_schema(generator)
     }
 }

crates/rmcp/src/model.rs

@@ -91,18 +91,19 @@ macro_rules! const_string {
 
         #[cfg(feature = "schemars")]
         impl schemars::JsonSchema for $name {
-            fn schema_name() -> String {
-                stringify!($name).to_string()
+            fn schema_name() -> Cow<'static, str> {
+                Cow::Borrowed(stringify!($name))
             }
 
-            fn json_schema(_: &mut schemars::SchemaGenerator) -> schemars::schema::Schema {
-                // Create a schema for a constant value of type String
-                schemars::schema::Schema::Object(schemars::schema::SchemaObject {
-                    instance_type: Some(schemars::schema::InstanceType::String.into()),
-                    format: Some("const".to_string()),
-                    const_value: Some(serde_json::Value::String($value.into())),
-                    ..Default::default()
-                })
+            fn json_schema(_: &mut schemars::SchemaGenerator) -> schemars::Schema {
+                use serde_json::{Map, json};
+
+                let mut schema_map = Map::new();
+                schema_map.insert("type".to_string(), json!("string"));
+                schema_map.insert("format".to_string(), json!("const"));
+                schema_map.insert("const".to_string(), json!($value));
+
+                schemars::Schema::from(schema_map)
             }
         }
     };
@@ -212,27 +213,23 @@ impl<'de> Deserialize<'de> for NumberOrString {
 
 #[cfg(feature = "schemars")]
 impl schemars::JsonSchema for NumberOrString {
-    fn schema_name() -> String {
-        "NumberOrString".to_string()
+    fn schema_name() -> Cow<'static, str> {
+        Cow::Borrowed("NumberOrString")
     }
 
-    fn json_schema(_: &mut schemars::SchemaGenerator) -> schemars::schema::Schema {
-        schemars::schema::Schema::Object(schemars::schema::SchemaObject {
-            subschemas: Some(Box::new(schemars::schema::SubschemaValidation {
-                one_of: Some(vec![
-                    schemars::schema::Schema::Object(schemars::schema::SchemaObject {
-                        instance_type: Some(schemars::schema::InstanceType::Number.into()),
-                        ..Default::default()
-                    }),
-                    schemars::schema::Schema::Object(schemars::schema::SchemaObject {
-                        instance_type: Some(schemars::schema::InstanceType::String.into()),
-                        ..Default::default()
-                    }),
-                ]),
-                ..Default::default()
-            })),
-            ..Default::default()
-        })
+    fn json_schema(_: &mut schemars::SchemaGenerator) -> schemars::Schema {
+        use serde_json::{Map, json};
+
+        let mut number_schema = Map::new();
+        number_schema.insert("type".to_string(), json!("number"));
+
+        let mut string_schema = Map::new();
+        string_schema.insert("type".to_string(), json!("string"));
+
+        let mut schema_map = Map::new();
+        schema_map.insert("oneOf".to_string(), json!([number_schema, string_schema]));
+
+        schemars::Schema::from(schema_map)
     }
 }
 

crates/rmcp/tests/test_complex_schema.rs

@@ -45,7 +45,11 @@ fn test_complex_schema() {
     let attr = Demo::chat_tool_attr();
     let input_schema = attr.input_schema;
     let enum_number = input_schema
-        .get("definitions")
+        .get("components")
+        .unwrap()
+        .as_object()
+        .unwrap()
+        .get("schemas")
         .unwrap()
         .as_object()
         .unwrap()

examples/servers/Cargo.toml

@@ -33,7 +33,7 @@ tracing-subscriber = { version = "0.3", features = [
 futures = "0.3"
 rand = { version = "0.9", features = ["std"] }
 axum = { version = "0.8", features = ["macros"] }
-schemars = { version = "0.8", optional = true }
+schemars = { version = "0.9", optional = true }
 reqwest = { version = "0.12", features = ["json"] }
 chrono = "0.4"
 uuid = { version = "1.6", features = ["v4", "serde"] }

examples/servers/src/common/counter.rs

@@ -1,4 +1,4 @@
-use std::sync::Arc;
+use std::{borrow::Cow, sync::Arc};
 
 use rmcp::{
     Error as McpError, RoleServer, ServerHandler, const_string, model::*, schemars,

examples/transport/Cargo.toml

@@ -36,7 +36,7 @@ tracing-subscriber = { version = "0.3", features = [
 ] }
 futures = "0.3"
 rand = { version = "0.9" }
-schemars = { version = "0.8", optional = true }
+schemars = { version = "0.9", optional = true }
 hyper = { version = "1", features = ["client", "server", "http1"] }
 hyper-util = { version = "0.1", features = ["tokio"] }
 tokio-tungstenite = "0.26.2"