diff --git a/.changeset/mcp-actions-backend-md-result-fix.md b/.changeset/mcp-actions-backend-md-result-fix.md
new file mode 100644
index 0000000000..63b651bf34
--- /dev/null
+++ b/.changeset/mcp-actions-backend-md-result-fix.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-mcp-actions-backend': patch
+---
+
+Fixed an issue where actions returned Markdown-formatted JSON instead of plain JSON and a `structuredContent` field for model context protocol responses.
diff --git a/docs-ui/src/app/components/accordion/page.mdx b/docs-ui/src/app/components/accordion/page.mdx
index 90c573b087..dc9b87b55d 100644
--- a/docs-ui/src/app/components/accordion/page.mdx
+++ b/docs-ui/src/app/components/accordion/page.mdx
@@ -140,7 +140,7 @@ Allows multiple panels to be open simultaneously.
 <Snippet
   align="center"
   py={4}
-  height="auto"
+  height={280}
   preview={<GroupMultipleOpen />}
   code={groupMultipleOpenSnippet}
 />
diff --git a/plugins/mcp-actions-backend/README.md b/plugins/mcp-actions-backend/README.md
index d496cf0f03..b3f6895078 100644
--- a/plugins/mcp-actions-backend/README.md
+++ b/plugins/mcp-actions-backend/README.md
@@ -135,6 +135,10 @@ When errors are thrown from MCP actions, the backend will handle and surface err
 
 See [Backstage Errors](https://backstage.io/docs/reference/errors/) for a full list of supported errors.
 
+### Response Format
+
+Tool execution results are returned in a format compliant with the MCP specification, including both a plain-text representation in the `content` array and the raw JSON result in the `structuredContent` field. This ensures that AI clients can process the data either as text or as structured data for more precise tool use.
+
 When writing MCP tools, use the appropriate error from `@backstage/errors` when applicable:
 
 ```ts
diff --git a/plugins/mcp-actions-backend/src/services/McpService.test.ts b/plugins/mcp-actions-backend/src/services/McpService.test.ts
index d96e9c7285..8aa1bcb22f 100644
--- a/plugins/mcp-actions-backend/src/services/McpService.test.ts
+++ b/plugins/mcp-actions-backend/src/services/McpService.test.ts
@@ -216,13 +216,10 @@ describe('McpService', () => {
     expect(result.content).toEqual([
       {
         type: 'text',
-        text: [
-          '```json',
-          JSON.stringify({ output: 'test' }, null, 2),
-          '```',
-        ].join('\n'),
+        text: JSON.stringify({ output: 'test' }),
       },
     ]);
+    expect((result as any).structuredContent).toEqual({ output: 'test' });
 
     const histogram = mockMetrics.createHistogram.mock.results[0]?.value;
     expect(histogram.record).toHaveBeenCalledTimes(1);
diff --git a/plugins/mcp-actions-backend/src/services/McpService.ts b/plugins/mcp-actions-backend/src/services/McpService.ts
index 9d907f8258..735bce6f55 100644
--- a/plugins/mcp-actions-backend/src/services/McpService.ts
+++ b/plugins/mcp-actions-backend/src/services/McpService.ts
@@ -135,7 +135,6 @@ export class McpService {
     const server = new McpServer(
       {
         name: serverConfig?.name ?? 'backstage',
-        // TODO: this version will most likely change in the future.
         version,
         ...(serverConfig?.description && {
           description: serverConfig.description,
@@ -159,9 +158,6 @@ export class McpService {
         return {
           tools: actions.map(action => ({
             inputSchema: action.schema.input,
-            // todo(blam): this is unfortunately not supported by most clients yet.
-            // When this is provided you need to provide structuredContent instead.
-            // outputSchema: action.schema.output,
             name: this.getToolName(action),
             description: action.description,
             annotations: {
@@ -238,9 +234,6 @@ export class McpService {
                 credentials,
               });
 
-              // Record the structured action output directly rather than the
-              // CallToolResult envelope below, which wraps an already-
-              // stringified markdown-fenced JSON block.
               if (this.captureToolPayloads) {
                 span.setAttribute(
                   'gen_ai.tool.call.result',
@@ -249,19 +242,13 @@ export class McpService {
               }
 
               return {
-                // todo(blam): unfortunately structuredContent is not supported by most clients yet.
-                // so the validation for the output happens in the default actions registry
-                // and we return it as json text instead for now.
                 content: [
                   {
                     type: 'text',
-                    text: [
-                      '```json',
-                      JSON.stringify(output, null, 2),
-                      '```',
-                    ].join('\n'),
+                    text: JSON.stringify(output),
                   },
                 ],
+                structuredContent: output,
               };
             });