Refactor to Pure Native JSON-RPC (Ditch SDKs)

server/src/mcp.rs

@@ -0,0 +1,32 @@
+use schemars::JsonSchema;
+use serde_json::json;
+
+pub fn success(id: serde_json::Value, result: serde_json::Value) -> serde_json::Value {
+    json!({
+        "jsonrpc": "2.0",
+        "id": id,
+        "result": result
+    })
+}
+
+pub fn error(id: serde_json::Value, code: i32, message: &str) -> serde_json::Value {
+    json!({
+        "jsonrpc": "2.0",
+        "id": id,
+        "error": {
+            "code": code,
+            "message": message
+        }
+    })
+}
+
+pub fn tool_def<T: JsonSchema>(name: &str, description: &str) -> serde_json::Value {
+    let schema = schemars::schema_for!(T);
+    let schema_val = serde_json::to_value(&schema).unwrap();
+    // MCP expects standard JSON schema. Schemars returns draft-07.
+    json!({
+        "name": name,
+        "description": description,
+        "inputSchema": schema_val
+    })
+}