Fix stream-json tool use details

.gitkeep

@@ -0,0 +1 @@
+# .gitkeep file auto-generated at 2026-07-27T03:36:32.513Z for PR creation at branch issue-281-8d4563b818c2 for issue https://github.com/link-assistant/agent/issues/281

js/.changeset/fix-stream-json-tool-use.md

@@ -0,0 +1,5 @@
+---
+'@link-assistant/agent': patch
+---
+
+Report tool names and inputs correctly in `stream-json` tool-use events.

js/src/json-standard/index.ts

@@ -111,13 +111,12 @@ export function convertOpenCodeToClaude(
     case 'tool_use':
       if (event.part && event.part.state) {
         const state = event.part.state as Record<string, unknown>;
-        const tool = state.tool as Record<string, unknown> | undefined;
         return {
           type: 'tool_use',
           timestamp,
           session_id,
-          name: (tool?.name as string) || 'unknown',
-          input: tool?.parameters || {},
+          name: (event.part.tool as string) || 'unknown',
+          input: state.input || {},
           tool_use_id: event.part.id as string,
         };
       }

js/tests/json-standard-unit.js

@@ -121,11 +121,13 @@ describe('JSON Standard Module - Unit Tests', () => {
         sessionID: 'ses_test123',
         part: {
           id: 'prt_tool123',
+          type: 'tool',
+          callID: 'call_tool123',
+          tool: 'write',
           state: {
-            tool: {
-              name: 'bash',
-              parameters: { command: 'ls' },
-            },
+            status: 'pending',
+            input: { filePath: 'hi.txt', content: 'hi\n' },
+            raw: '',
           },
         },
       };
@@ -134,8 +136,11 @@ describe('JSON Standard Module - Unit Tests', () => {
 
       expect(claudeEvent).not.toBeNull();
       expect(claudeEvent.type).toBe('tool_use');
-      expect(claudeEvent.name).toBe('bash');
-      expect(claudeEvent.input).toEqual({ command: 'ls' });
+      expect(claudeEvent.name).toBe('write');
+      expect(claudeEvent.input).toEqual({
+        filePath: 'hi.txt',
+        content: 'hi\n',
+      });
       expect(claudeEvent.tool_use_id).toBe('prt_tool123');
     });