fix: fix tool deserialization error

Author: =

Cargo.toml

@@ -1,4 +1,4 @@
-cargo-features = ["edition2024"]
+
 
 [workspace]
 members = ["crates/rmcp", "crates/rmcp-macros", "examples/*"]

crates/rmcp-macros/Cargo.toml

@@ -1,4 +1,4 @@
-cargo-features = ["edition2024"]
+
 
 [package]
 name = "rmcp-macros"

crates/rmcp-macros/src/tool.rs

@@ -347,7 +347,7 @@ pub(crate) fn tool_fn_item(attr: TokenStream, mut input_fn: ItemFn) -> syn::Resu
             #input_fn_vis fn #tool_attr_fn_ident() -> rmcp::model::Tool {
                 rmcp::model::Tool {
                     name: #name.into(),
-                    description: #description.into(),
+                    description: Some(#description.into()),
                     input_schema: #schema.into(),
                 }
             }

crates/rmcp/Cargo.toml

@@ -1,4 +1,4 @@
-cargo-features = ["edition2024"]
+
 
 [package]
 name = "rmcp"
@@ -95,5 +95,5 @@ path = "tests/test_with_python.rs"
 
 [[test]]
 name = "test_with_js"
-required-features = ["server", "transport-sse-server"]
+required-features = ["server", "client", "transport-sse-server", "transport-child-process"]
 path = "tests/test_with_js.rs"

crates/rmcp/src/model/tool.rs

@@ -14,7 +14,8 @@ pub struct Tool {
     /// The name of the tool
     pub name: Cow<'static, str>,
     /// A description of what the tool does
-    pub description: Cow<'static, str>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub description: Option<Cow<'static, str>>,
     /// A JSON Schema object defining the expected parameters for the tool
     pub input_schema: Arc<JsonObject>,
 }
@@ -29,7 +30,7 @@ impl Tool {
     {
         Tool {
             name: name.into(),
-            description: description.into(),
+            description: Some(description.into()),
             input_schema: input_schema.into(),
         }
     }

crates/rmcp/tests/test_deserialization.rs

@@ -0,0 +1,15 @@
+use rmcp::model::{JsonRpcResponse, ServerJsonRpcMessage, ServerResult};
+#[test]
+fn test_tool_list_result() {
+    let json = std::fs::read("tests/test_deserialization/tool_list_result.json").unwrap();
+    let result: ServerJsonRpcMessage = serde_json::from_slice(&json).unwrap();
+    println!("{result:#?}");
+
+    assert!(matches!(
+        result,
+        ServerJsonRpcMessage::Response(JsonRpcResponse {
+            result: ServerResult::ListToolsResult(_),
+            ..
+        })
+    ));
+}

crates/rmcp/tests/test_deserialization/tool_list_result.json

@@ -0,0 +1,28 @@
+{
+    "result": {
+        "tools": [
+            {
+                "name": "add",
+                "inputSchema": {
+                    "type": "object",
+                    "properties": {
+                        "a": {
+                            "type": "number"
+                        },
+                        "b": {
+                            "type": "number"
+                        }
+                    },
+                    "required": [
+                        "a",
+                        "b"
+                    ],
+                    "additionalProperties": false,
+                    "$schema": "http://json-schema.org/draft-07/schema#"
+                }
+            }
+        ]
+    },
+    "jsonrpc": "2.0",
+    "id": 2
+}

examples/clients/Cargo.toml

@@ -1,4 +1,4 @@
-cargo-features = ["edition2024"]
+
 
 [package]
 name = "mcp-client-examples"

examples/rig-integration/Cargo.toml

@@ -1,5 +1,3 @@
-cargo-features = ["edition2024"]
-
 [package]
 name = "rig-integration"
 edition = { workspace = true }

examples/rig-integration/src/mcp_adaptor.rs

@@ -1,6 +1,6 @@
 use std::collections::HashMap;
 
-use rig::tool::{ToolDyn as RigTool, ToolEmbeddingDyn, ToolSet};
+use rig::tool::{ToolDyn as RigTool, ToolSet};
 use rmcp::{
     RoleClient,
     model::{CallToolRequestParam, CallToolResult, Tool as McpTool},
@@ -24,7 +24,12 @@ impl RigTool for McpToolAdaptor {
     {
         Box::pin(std::future::ready(rig::completion::ToolDefinition {
             name: self.name(),
-            description: self.tool.description.to_string(),
+            description: self
+                .tool
+                .description
+                .as_deref()
+                .unwrap_or_default()
+                .to_string(),
             parameters: self.tool.schema_as_json_value(),
         }))
     }
@@ -51,22 +56,6 @@ impl RigTool for McpToolAdaptor {
     }
 }
 
-impl ToolEmbeddingDyn for McpToolAdaptor {
-    fn embedding_docs(&self) -> Vec<String> {
-        vec![
-            self.tool.description.clone().to_string(),
-            format!("Tool name: {}", self.tool.name),
-            format!("Tool capability: {}", self.tool.description),
-        ]
-    }
-
-    fn context(&self) -> serde_json::Result<serde_json::Value> {
-        Ok(serde_json::json!({
-            "tool_name": self.tool.name,
-        }))
-    }
-}
-
 pub struct McpManager {
     pub clients: HashMap<String, RunningService<RoleClient, ()>>,
 }