diff --git a/src/server/protocol.ts b/src/server/protocol.ts
index 1ce0c66019f6d..297e0705fa3f9 100644
--- a/src/server/protocol.ts
+++ b/src/server/protocol.ts
@@ -843,7 +843,6 @@ namespace ts.server.protocol {
     /**
      * A request to get encoded semantic classifications for a span in the file
      */
-    /** @internal */
     export interface EncodedSemanticClassificationsRequest extends FileRequest {
         arguments: EncodedSemanticClassificationsRequestArgs;
     }
@@ -851,7 +850,6 @@ namespace ts.server.protocol {
     /**
      * Arguments for EncodedSemanticClassificationsRequest request.
      */
-    /** @internal */
     export interface EncodedSemanticClassificationsRequestArgs extends FileRequestArgs {
         /**
          * Start position of the span.
@@ -868,6 +866,18 @@ namespace ts.server.protocol {
         format?: "original" | "2020"
     }
 
+    /** The response for a EncodedSemanticClassificationsRequest */
+    export interface EncodedSemanticClassificationsResponse extends Response {
+        body?: EncodedSemanticClassificationsResponseBody
+    }
+
+    /**
+     * Implementation response message. Gives series of text spans depending on the format ar.
+     */
+    export interface EncodedSemanticClassificationsResponseBody {
+        endOfLineState: EndOfLineState;
+        spans: number[];
+    }
     /**
      * Arguments in document highlight request; include: filesToSearch, file,
      * line, offset.
@@ -3390,4 +3400,32 @@ namespace ts.server.protocol {
         ES2020 = "ES2020",
         ESNext = "ESNext"
     }
+
+    export const enum ClassificationType {
+        comment = 1,
+        identifier = 2,
+        keyword = 3,
+        numericLiteral = 4,
+        operator = 5,
+        stringLiteral = 6,
+        regularExpressionLiteral = 7,
+        whiteSpace = 8,
+        text = 9,
+        punctuation = 10,
+        className = 11,
+        enumName = 12,
+        interfaceName = 13,
+        moduleName = 14,
+        typeParameterName = 15,
+        typeAliasName = 16,
+        parameterName = 17,
+        docCommentTagName = 18,
+        jsxOpenTagName = 19,
+        jsxCloseTagName = 20,
+        jsxSelfClosingTagName = 21,
+        jsxAttribute = 22,
+        jsxText = 23,
+        jsxAttributeStringLiteralValue = 24,
+        bigintLiteral = 25,
+    }
 }
diff --git a/tests/baselines/reference/api/tsserverlibrary.d.ts b/tests/baselines/reference/api/tsserverlibrary.d.ts
index d2e7603a3c959..32e43fc0c4c77 100644
--- a/tests/baselines/reference/api/tsserverlibrary.d.ts
+++ b/tests/baselines/reference/api/tsserverlibrary.d.ts
@@ -7138,6 +7138,41 @@ declare namespace ts.server.protocol {
          */
         body?: string[];
     }
+    /**
+     * A request to get encoded semantic classifications for a span in the file
+     */
+    interface EncodedSemanticClassificationsRequest extends FileRequest {
+        arguments: EncodedSemanticClassificationsRequestArgs;
+    }
+    /**
+     * Arguments for EncodedSemanticClassificationsRequest request.
+     */
+    interface EncodedSemanticClassificationsRequestArgs extends FileRequestArgs {
+        /**
+         * Start position of the span.
+         */
+        start: number;
+        /**
+         * Length of the span.
+         */
+        length: number;
+        /**
+         * Optional parameter for the semantic highlighting response, if absent it
+         * defaults to "original".
+         */
+        format?: "original" | "2020";
+    }
+    /** The response for a EncodedSemanticClassificationsRequest */
+    interface EncodedSemanticClassificationsResponse extends Response {
+        body?: EncodedSemanticClassificationsResponseBody;
+    }
+    /**
+     * Implementation response message. Gives series of text spans depending on the format ar.
+     */
+    interface EncodedSemanticClassificationsResponseBody {
+        endOfLineState: EndOfLineState;
+        spans: number[];
+    }
     /**
      * Arguments in document highlight request; include: filesToSearch, file,
      * line, offset.
@@ -9161,6 +9196,33 @@ declare namespace ts.server.protocol {
         ES2020 = "ES2020",
         ESNext = "ESNext"
     }
+    enum ClassificationType {
+        comment = 1,
+        identifier = 2,
+        keyword = 3,
+        numericLiteral = 4,
+        operator = 5,
+        stringLiteral = 6,
+        regularExpressionLiteral = 7,
+        whiteSpace = 8,
+        text = 9,
+        punctuation = 10,
+        className = 11,
+        enumName = 12,
+        interfaceName = 13,
+        moduleName = 14,
+        typeParameterName = 15,
+        typeAliasName = 16,
+        parameterName = 17,
+        docCommentTagName = 18,
+        jsxOpenTagName = 19,
+        jsxCloseTagName = 20,
+        jsxSelfClosingTagName = 21,
+        jsxAttribute = 22,
+        jsxText = 23,
+        jsxAttributeStringLiteralValue = 24,
+        bigintLiteral = 25
+    }
 }
 declare namespace ts.server {
     interface ScriptInfoVersion {