From 45afd88934805962a1067cf943918932f757b9df Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fran=C3=A7ois=20Beaufort?= <beaufort.francois@gmail.com>
Date: Thu, 20 Aug 2026 11:39:13 +0200
Subject: [PATCH 1/3] Change `executeTool()` inputObject type from `object` to
 `any`

---
 index.bs | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/index.bs b/index.bs
index 69bed7e..e40eb40 100644
--- a/index.bs
+++ b/index.bs
@@ -604,7 +604,7 @@ The {{ModelContext}} interface provides methods for web applications to register
 interface ModelContext : EventTarget {
   Promise<undefined> registerTool(ModelContextTool tool, optional ModelContextRegisterToolOptions options = {});
   Promise<sequence<RegisteredTool>> getTools(optional ModelContextGetToolOptions options = {});
-  Promise<DOMString> executeTool(RegisteredTool tool, optional object inputObject = {}, optional ModelContextExecuteToolOptions options = {});
+  Promise<DOMString> executeTool(RegisteredTool tool, optional any inputObject, optional ModelContextExecuteToolOptions options = {});
 
   attribute EventHandler ontoolchange;
 };
@@ -919,8 +919,16 @@ The <dfn method for=ModelContext>executeTool(<var>tool</var>, <var>inputObject</
 
 1. [=Assert=]: |expectedTargetOrigin| is not an [=opaque origin=].
 
-1. Let |inputArguments| be the result of [=serializing a JavaScript value to a JSON string=] given
-   |inputObject|. If this threw an exception, then return [=a promise rejected with=] that exception.
+1. Let |inputArguments| be "<code>{}</code>".
+
+1. If |inputObject| is not {{undefined}}, then:
+
+   1. If |inputObject| [=Object type|is not an Object=], then return [=a promise rejected with=] a
+      {{TypeError}}.
+
+   1. Set |inputArguments| to the result of [=serializing a JavaScript value to a JSON string=]
+      given |inputObject|. If this threw an exception, then return [=a promise rejected with=] that
+      exception.
 
 1. Let |promise| be [=a new promise=] created in [=this=]'s [=relevant realm=].
 

From abc7c99779da9254d15b5640a7d7b7d65740e4ba Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fran=C3=A7ois=20Beaufort?= <beaufort.francois@gmail.com>
Date: Mon, 7 Sep 2026 11:22:06 +0200
Subject: [PATCH 2/3] Use TC39 object check

---
 index.bs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/index.bs b/index.bs
index e40eb40..27aa735 100644
--- a/index.bs
+++ b/index.bs
@@ -108,6 +108,7 @@ spec: ECMASCRIPT; urlPrefix: https://tc39.es/ecma262/
   type: dfn
     text: surrounding agent; url: surrounding-agent
     text: agent cluster; url: sec-agent-clusters
+    text: is not an object; url: sec-object-type
 </pre>
 
 <h2 id="intro">Introduction</h2>
@@ -923,7 +924,7 @@ The <dfn method for=ModelContext>executeTool(<var>tool</var>, <var>inputObject</
 
 1. If |inputObject| is not {{undefined}}, then:
 
-   1. If |inputObject| [=Object type|is not an Object=], then return [=a promise rejected with=] a
+   1. If |inputObject| [=is not an Object=], then return [=a promise rejected with=] a
       {{TypeError}}.
 
    1. Set |inputArguments| to the result of [=serializing a JavaScript value to a JSON string=]

From b755b644828a7a21c59551a321bacf9ca7fb9a4d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fran=C3=A7ois=20Beaufort?= <beaufort.francois@gmail.com>
Date: Thu, 10 Sep 2026 18:19:16 +0200
Subject: [PATCH 3/3] refactor: simplify input object serialization by removing
 unnecessary undefined check

---
 index.bs | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/index.bs b/index.bs
index 564397e..462bf60 100644
--- a/index.bs
+++ b/index.bs
@@ -928,16 +928,10 @@ The <dfn method for=ModelContext>executeTool(<var>tool</var>, <var>inputObject</
 
 1. [=Assert=]: |expectedTargetOrigin| is not an [=opaque origin=].
 
-1. Let |inputArguments| be "<code>{}</code>".
+1. If |inputObject| [=is not an Object=], then return [=a promise rejected with=] a {{TypeError}}.
 
-1. If |inputObject| is not {{undefined}}, then:
-
-   1. If |inputObject| [=is not an Object=], then return [=a promise rejected with=] a
-      {{TypeError}}.
-
-   1. Set |inputArguments| to the result of [=serializing a JavaScript value to a JSON string=]
-      given |inputObject|. If this threw an exception, then return [=a promise rejected with=] that
-      exception.
+1. Let |inputArguments| be the result of [=serializing a JavaScript value to a JSON string=] given
+   |inputObject|. If this threw an exception, then return [=a promise rejected with=] that exception.
 
 1. Let |promise| be [=a new promise=] created in [=this=]'s [=relevant realm=].