diff --git a/lib/index.js b/lib/index.js
index f3dc872..7567b5d 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -97,19 +97,23 @@ export function apply(ctx) {
     name: 'find_dsh_plugins',
     description: TOOL_DESCRIPTION,
     parameters: {
-      query: {
-        type: 'string',
-        required: true,
-        description: 'User\'s need in natural language (Chinese or English), e.g. "给纯文本模型读图片的能力", "手机上查看会话进度", "Claude Code 风格的终端界面".',
-      },
-      limit: {
-        type: 'number',
-        description: 'Max results to return (default 5, max 10).',
-      },
-      installable_only: {
-        type: 'boolean',
-        description: 'Return only plugins that declare a dsh.bundle manifest and can be installed with dsh plugin add. Default false.',
+      type: 'object',
+      additionalProperties: false,
+      properties: {
+        query: {
+          type: 'string',
+          description: 'User\'s need in natural language (Chinese or English), e.g. "给纯文本模型读图片的能力", "手机上查看会话进度", "Claude Code 风格的终端界面".',
+        },
+        limit: {
+          type: 'number',
+          description: 'Max results to return (default 5, max 10).',
+        },
+        installable_only: {
+          type: 'boolean',
+          description: 'Return only plugins that declare a dsh.bundle manifest and can be installed with dsh plugin add. Default false.',
+        },
       },
+      required: ['query'],
     },
     output: {
       schema: {