diff --git a/patches/typescript/overlay/src/compiler/tsgoTransport.ts b/patches/typescript/overlay/src/compiler/tsgoTransport.ts
index db86eca..18c8d77 100644
--- a/patches/typescript/overlay/src/compiler/tsgoTransport.ts
+++ b/patches/typescript/overlay/src/compiler/tsgoTransport.ts
@@ -825,6 +825,9 @@ class ArenaClient {
                 }
                 data.tnbCompletionData = { autoImport };
             }
+            // The completionEntryDetails resolver sees only entry.data,
+            // not entry flags; without the flag it checks the main program.
+            if (flags & 64) data.isPackageJsonImport = true;
             d.data = data;
         }
         if (flags & 64) d.isPackageJsonImport = true;
diff --git a/tools/ci-witness-groups.mjs b/tools/ci-witness-groups.mjs
index 31c4be1..0b952cb 100644
--- a/tools/ci-witness-groups.mjs
+++ b/tools/ci-witness-groups.mjs
@@ -48,7 +48,7 @@ import * as fs from 'node:fs';
 import * as path from 'node:path';
 import { fileURLToPath } from 'node:url';
 
-const TOTAL = 91;
+const TOTAL = 92;
 
 // Witnesses intentionally NOT in the matrix — run on demand (reasons above).
 const LOCAL_ONLY = [
@@ -147,6 +147,7 @@ const groups = [
 			'triage-overlay-delta-sync',
 			'triage-completion-details-array',
 			'triage-local-autoimport-details',
+			'triage-packagejson-autoimport-details',
 			'triage-alias-self-loop',
 			'triage-alias-nil',
 			'triage-empty-literal',
diff --git a/tools/triage-packagejson-autoimport-details.mjs b/tools/triage-packagejson-autoimport-details.mjs
new file mode 100644
index 0000000..3a22541
--- /dev/null
+++ b/tools/triage-packagejson-autoimport-details.mjs
@@ -0,0 +1,70 @@
+#!/usr/bin/env node
+/**
+ * Witness: package-json auto-imports keep `isPackageJsonImport` on completion
+ * entry DATA, not just the entry. Details round-trips data alone; without the
+ * flag its resolver checks the main program instead of the provider and fails.
+ */
+import fs from 'node:fs';
+import os from 'node:os';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { tnbHarnessEnv, withTsserver } from './tsserver-harness.mjs';
+
+const repoRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..');
+const tsserverPath = path.join(repoRoot, 'lib', 'tsserver.js');
+const root = fs.mkdtempSync(path.join(os.tmpdir(), 'tnb-packagejson-autoimport-'));
+const pkg = path.join(root, 'node_modules', 'pathe');
+const main = path.join(root, 'main.ts');
+const content = 'join;\n';
+
+fs.mkdirSync(pkg, { recursive: true });
+fs.writeFileSync(main, content);
+fs.writeFileSync(path.join(root, 'package.json'), JSON.stringify({ dependencies: { pathe: '*' } }));
+fs.writeFileSync(path.join(root, 'tsconfig.json'), JSON.stringify({ compilerOptions: { module: 'nodenext', moduleResolution: 'nodenext' }, include: ['*.ts'] }));
+fs.writeFileSync(path.join(pkg, 'package.json'), JSON.stringify({
+	name: 'pathe', types: './index.d.ts',
+}));
+fs.writeFileSync(path.join(pkg, 'index.d.ts'), 'export declare function join(...paths: string[]): string;\n');
+
+const preferences = { includePackageJsonAutoImports: 'on' };
+try {
+	const result = await withTsserver({
+		tsserverPath,
+		args: ['--disableAutomaticTypingAcquisition', '--suppressDiagnosticEvents'],
+		env: tnbHarnessEnv(),
+	}, async ({ send }) => {
+		await send('configure', { preferences });
+		await send('updateOpen', { changedFiles: [], closedFiles: [], openFiles: [{ file: main, fileContent: content, projectRootPath: root }] });
+		const completion = await send('completionInfo', {
+			file: main,
+			line: 1,
+			offset: 5,
+			includeExternalModuleExports: true,
+		});
+		const entry = completion.body?.entries?.find(candidate => candidate.name === 'join');
+		if (!entry?.source) throw new Error('completionInfo did not return a sourced join entry');
+		if (!entry.data?.tnbCompletionData) throw new Error('completionInfo did not preserve native completion resolve data');
+		if (!entry.data.isPackageJsonImport) throw new Error('completion entry data lost isPackageJsonImport');
+
+		const details = await send('completionEntryDetails', {
+			file: main,
+			line: 1,
+			offset: 5,
+			includeExternalModuleExports: true,
+			entryNames: [{ name: entry.name, source: entry.source, data: entry.data }],
+			preferences,
+		});
+		if (!details.success) throw new Error(details.message || 'completionEntryDetails failed');
+		const edit = details.body?.[0]?.codeActions?.flatMap(action => action.changes ?? [])
+			.filter(change => change.fileName === main)
+			.flatMap(change => change.textChanges ?? [])
+			.find(change => change.newText.includes('join') && change.newText.includes('pathe'));
+		if (!edit) throw new Error('completionEntryDetails returned no pathe import edit');
+		return { source: entry.source, edit: edit.newText };
+	});
+	console.log(`ok package-json auto-import completion details: ${JSON.stringify(result)}`);
+}
+finally {
+	fs.rmSync(root, { recursive: true, force: true });
+}
+process.exit(0);