diff --git a/pkg/server/api/mcp/v1/schema.resolvers.go b/pkg/server/api/mcp/v1/schema.resolvers.go
index 2e0253989..104665e57 100644
--- a/pkg/server/api/mcp/v1/schema.resolvers.go
+++ b/pkg/server/api/mcp/v1/schema.resolvers.go
@@ -3351,3 +3351,29 @@ func (r *Resolver) PublishMinorDocumentVersionTool(ctx context.Context, req *mcp
 		DocumentVersion: types.NewDocumentVersion(documentVersion),
 	}, nil
 }
+
+func (r *Resolver) UpdateDocumentVersionContentTool(ctx context.Context, req *mcp.CallToolRequest, input *types.UpdateDocumentVersionContentInput) (*mcp.CallToolResult, types.UpdateDocumentVersionContentOutput, error) {
+	r.MustAuthorize(ctx, input.DocumentVersionID, probo.ActionDocumentUpdate)
+
+	svc := r.ProboService(ctx, input.DocumentVersionID)
+
+	content, err := svc.Documents.UpdateDocumentVersionContent(
+		ctx,
+		probo.UpdateDocumentVersionRequest{
+			ID:      input.DocumentVersionID,
+			Content: input.Content,
+		},
+	)
+	if err != nil {
+		var errNotDraft *probo.ErrDocumentVersionNotDraft
+		if errors.As(err, &errNotDraft) {
+			return nil, types.UpdateDocumentVersionContentOutput{}, fmt.Errorf("cannot update document version content: %w", err)
+		}
+
+		panic(fmt.Errorf("cannot update document version content: %w", err))
+	}
+
+	return nil, types.UpdateDocumentVersionContentOutput{
+		Content: content,
+	}, nil
+}
diff --git a/pkg/server/api/mcp/v1/specification.yaml b/pkg/server/api/mcp/v1/specification.yaml
index 93557d4ff..6f8376cf0 100644
--- a/pkg/server/api/mcp/v1/specification.yaml
+++ b/pkg/server/api/mcp/v1/specification.yaml
@@ -5597,6 +5597,28 @@ components:
         document_version:
           $ref: "#/components/schemas/DocumentVersion"
 
+    UpdateDocumentVersionContentInput:
+      type: object
+      required:
+        - document_version_id
+        - content
+      properties:
+        document_version_id:
+          $ref: "#/components/schemas/GID"
+          description: Document version ID
+        content:
+          type: string
+          description: ProseMirror JSON document content
+
+    UpdateDocumentVersionContentOutput:
+      type: object
+      required:
+        - content
+      properties:
+        content:
+          type: string
+          description: Updated document content
+
     DeleteDraftDocumentVersionInput:
       type: object
       required:
@@ -7484,6 +7506,14 @@ tools:
       $ref: "#/components/schemas/UpdateDocumentVersionInput"
     outputSchema:
       $ref: "#/components/schemas/UpdateDocumentVersionOutput"
+  - name: updateDocumentVersionContent
+    description: Update draft document version body content only (ProseMirror JSON).
+    hints:
+      readonly: false
+    inputSchema:
+      $ref: "#/components/schemas/UpdateDocumentVersionContentInput"
+    outputSchema:
+      $ref: "#/components/schemas/UpdateDocumentVersionContentOutput"
   - name: deleteDraftDocumentVersion
     description: Delete a draft document version
     hints: