diff --git a/plugins/mcp-server/src/com/intellij/mcpserver/impl/ReflectionCallableMcpTool.kt b/plugins/mcp-server/src/com/intellij/mcpserver/impl/ReflectionCallableMcpTool.kt
index 8754e64071fb..7cd38959c51b 100644
--- a/plugins/mcp-server/src/com/intellij/mcpserver/impl/ReflectionCallableMcpTool.kt
+++ b/plugins/mcp-server/src/com/intellij/mcpserver/impl/ReflectionCallableMcpTool.kt
@@ -14,6 +14,7 @@ class ReflectionCallableMcpTool(override val descriptor: McpToolDescriptor, priv
     return when {
       result.result == null -> McpToolCallResult.text("[null]")
       result.result is Unit -> McpToolCallResult.text("[success]")
+      result.result is Char -> McpToolCallResult.text("'${result.result}'") // special case for String to avoid extra quotes added by Any?.toString()
       result.result is String -> McpToolCallResult.text(result.result) // special case for String to avoid extra quotes added by Any?.toString()
       result.result.javaClass.isPrimitive -> McpToolCallResult.text(result.result.toString())
       result.result is McpToolCallResult -> result.result
diff --git a/plugins/mcp-server/test/com/intellij/mcpserver/InputSchemaTest.kt b/plugins/mcp-server/test/com/intellij/mcpserver/InputSchemaTest.kt
index bbd7d9deb514..f126cf123aab 100644
--- a/plugins/mcp-server/test/com/intellij/mcpserver/InputSchemaTest.kt
+++ b/plugins/mcp-server/test/com/intellij/mcpserver/InputSchemaTest.kt
@@ -82,8 +82,6 @@ class InputSchemaTest {
     "properties": {
         "intArg": {
             "type": "integer",
-            "minimum": -2147483648,
-            "maximum": 2147483647,
             "description": "int description on parameter"
         }
     },
@@ -137,8 +135,6 @@ class InputSchemaTest {
             "properties": {
                 "a": {
                     "type": "integer",
-                    "minimum": -2147483648,
-                    "maximum": 2147483647,
                     "description": "Field description a"
                 },
                 "b": {
@@ -166,9 +162,7 @@ class InputSchemaTest {
                     ],
                     "properties": {
                         "e": {
-                            "type": "number",
-                            "minimum": 4.9E-324,
-                            "maximum": 1.7976931348623157E308
+                            "type": "number"
                         }
                     },
                     "description": "Field description d"
@@ -180,9 +174,7 @@ class InputSchemaTest {
                     ],
                     "properties": {
                         "e": {
-                            "type": "number",
-                            "minimum": 4.9E-324,
-                            "maximum": 1.7976931348623157E308
+                            "type": "number"
                         }
                     },
                     "description": "Field description dOptional"
@@ -211,8 +203,6 @@ class InputSchemaTest {
             "properties": {
                 "a": {
                     "type": "integer",
-                    "minimum": -2147483648,
-                    "maximum": 2147483647,
                     "description": "Field description a"
                 },
                 "b": {
@@ -240,9 +230,7 @@ class InputSchemaTest {
                     ],
                     "properties": {
                         "e": {
-                            "type": "number",
-                            "minimum": 4.9E-324,
-                            "maximum": 1.7976931348623157E308
+                            "type": "number"
                         }
                     },
                     "description": "Field description d"
@@ -254,9 +242,7 @@ class InputSchemaTest {
                     ],
                     "properties": {
                         "e": {
-                            "type": "number",
-                            "minimum": 4.9E-324,
-                            "maximum": 1.7976931348623157E308
+                            "type": "number"
                         }
                     },
                     "description": "Field description dOptional"
diff --git a/plugins/mcp-server/test/com/intellij/mcpserver/ReturnValueRenderingTest.kt b/plugins/mcp-server/test/com/intellij/mcpserver/ReturnValueRenderingTest.kt
index d2021d7f7309..4cb5eba0e42a 100644
--- a/plugins/mcp-server/test/com/intellij/mcpserver/ReturnValueRenderingTest.kt
+++ b/plugins/mcp-server/test/com/intellij/mcpserver/ReturnValueRenderingTest.kt
@@ -33,8 +33,8 @@ class ReturnValueRenderingTest {
       Arguments.of(::returnShort,"12345"),
       Arguments.of(::returnByte,"123"),
       Arguments.of(::returnBoolean,"true"),
-      Arguments.of(::returnChar,"\"a\""),
-      Arguments.of(::returnString,"\"string\""),
+      Arguments.of(::returnChar,"'a'"),
+      Arguments.of(::returnString,"string"),
       Arguments.of(::returnFloat,"1.23458"),
       Arguments.of(::returnDouble,"1.2345"),
       Arguments.of(::returnVoid,"[success]"),