Fix artifact extraction for create_file MCP tool (v1.10.15)

When Anthropic's `enabled_artifacts_attachments` conversation setting
is false, Claude creates files via the skills-runner `create_file` MCP
tool instead of the legacy `artifacts` tool. The display_content shape
is identical (json_block with language / code / filename), only the
tool_use.name differs. The v1.9.1 strict allowlist was rejecting it,
silently dropping every artifact in those conversations.

Allowlist now accepts both 'artifacts' and 'create_file'. Other skills
tools that happen to share json_block display (view, list_directory,
etc.) stay filtered out by name.

Two regression tests added:
- positive: create_file with markdown json_block extracts correctly
- negative: view tool with similar json_block stays filtered

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

chrome/utils.js

@@ -247,9 +247,17 @@ function extractArtifactsFromMessage(message) {
   // Check if message has content array (new format)
   if (message.content && Array.isArray(message.content)) {
     for (const content of message.content) {
-      // NEW FORMAT: tool_use with display_content
-      // Only the `artifacts` tool produces real artifacts — bash, web_search, repl, etc. are filtered out
-      if (content.type === 'tool_use' && content.name === 'artifacts' && content.display_content) {
+      // NEW FORMAT: tool_use with display_content.
+      // Allowlist real file/artifact producers:
+      //   - `artifacts` — legacy artifacts tool (still used when
+      //     `enabled_artifacts_attachments` is true)
+      //   - `create_file` — skills-runner MCP tool that replaced artifacts
+      //     when `enabled_artifacts_attachments` is false. Same json_block
+      //     display_content shape (language / code / filename).
+      // bash, web_search, repl, view, list_directory, etc. are filtered out.
+      if (content.type === 'tool_use' &&
+          (content.name === 'artifacts' || content.name === 'create_file') &&
+          content.display_content) {
         const displayContent = content.display_content;
 
         // Check for code_block format (newer artifact format)

firefox/utils.js

@@ -247,9 +247,17 @@ function extractArtifactsFromMessage(message) {
   // Check if message has content array (new format)
   if (message.content && Array.isArray(message.content)) {
     for (const content of message.content) {
-      // NEW FORMAT: tool_use with display_content
-      // Only the `artifacts` tool produces real artifacts — bash, web_search, repl, etc. are filtered out
-      if (content.type === 'tool_use' && content.name === 'artifacts' && content.display_content) {
+      // NEW FORMAT: tool_use with display_content.
+      // Allowlist real file/artifact producers:
+      //   - `artifacts` — legacy artifacts tool (still used when
+      //     `enabled_artifacts_attachments` is true)
+      //   - `create_file` — skills-runner MCP tool that replaced artifacts
+      //     when `enabled_artifacts_attachments` is false. Same json_block
+      //     display_content shape (language / code / filename).
+      // bash, web_search, repl, view, list_directory, etc. are filtered out.
+      if (content.type === 'tool_use' &&
+          (content.name === 'artifacts' || content.name === 'create_file') &&
+          content.display_content) {
         const displayContent = content.display_content;
 
         // Check for code_block format (newer artifact format)

tests/utils.test.js

@@ -114,6 +114,59 @@ describe('extractArtifactsFromMessage — tool name filter', () => {
     };
     expect(extractArtifactsFromMessage(message)).toEqual([]);
   });
+
+  // Regression: when `enabled_artifacts_attachments` is false in conversation
+  // settings, Claude uses the skills-runner `create_file` MCP tool instead of
+  // the legacy `artifacts` tool. display_content shape is identical
+  // (json_block with language / code / filename). The extractor must allowlist
+  // both tool names.
+  it('extracts a create_file tool_use (skills-runner replacement for artifacts)', () => {
+    const message = {
+      content: [
+        {
+          type: 'tool_use',
+          name: 'create_file',
+          input: {
+            path: '/mnt/user-data/outputs/hello.md',
+            file_text: '# Hello, world!\n',
+          },
+          display_content: {
+            type: 'json_block',
+            json_block: JSON.stringify({
+              language: 'markdown',
+              code: '# Hello, world!\n',
+              filename: '/mnt/user-data/outputs/hello.md',
+            }),
+          },
+        },
+      ],
+    };
+    const artifacts = extractArtifactsFromMessage(message);
+    expect(artifacts).toHaveLength(1);
+    expect(artifacts[0].title).toBe('hello');
+    expect(artifacts[0].language).toBe('markdown');
+    expect(artifacts[0].content).toBe('# Hello, world!');
+  });
+
+  it('still rejects other skills tools that share json_block display (e.g. view, list_directory)', () => {
+    const message = {
+      content: [
+        {
+          type: 'tool_use',
+          name: 'view',
+          display_content: {
+            type: 'json_block',
+            json_block: JSON.stringify({
+              language: 'text',
+              code: 'directory listing here',
+              filename: '/mnt/skills/public',
+            }),
+          },
+        },
+      ],
+    };
+    expect(extractArtifactsFromMessage(message)).toEqual([]);
+  });
 });
 
 describe('extractArtifactFiles — end-to-end', () => {