From 267859ddb56bff737d4310e98df040e7bd33f049 Mon Sep 17 00:00:00 2001
From: n24q02m <quangminh2422004@gmail.com>
Date: Thu, 5 Mar 2026 09:22:01 +0700
Subject: [PATCH 1/2] fix(gemini): strip `deprecated` keyword from tool schemas
 sent to Gemini API

Gemini API rejects function declarations containing the JSON Schema
`deprecated` keyword with INVALID_ARGUMENT. Claude Code and other
clients include this field in their tool definitions, causing 400
errors on Antigravity/Gemini routes.

Add `deprecated` to the unsupported keywords list in
removeUnsupportedKeywords() so it is stripped before forwarding.
---
 internal/util/gemini_schema.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/internal/util/gemini_schema.go b/internal/util/gemini_schema.go
index b8d07bf4d9..e0caab8222 100644
--- a/internal/util/gemini_schema.go
+++ b/internal/util/gemini_schema.go
@@ -431,6 +431,7 @@ func removeUnsupportedKeywords(jsonStr string) string {
 		"$schema", "$defs", "definitions", "const", "$ref", "$id", "additionalProperties",
 		"propertyNames", "patternProperties", // Gemini doesn't support these schema keywords
 		"enumTitles", "prefill", // Claude/OpenCode schema metadata fields unsupported by Gemini
+		"deprecated", // JSON Schema keyword not supported by Gemini API
 	)
 
 	deletePaths := make([]string, 0)

From fafa1d155d9d901d768d6d640de5675d82c74346 Mon Sep 17 00:00:00 2001
From: n24q02m <quangminh2422004@gmail.com>
Date: Thu, 5 Mar 2026 09:27:55 +0700
Subject: [PATCH 2/2] test(gemini): add test for deprecated keyword removal

Verify that `deprecated` field is stripped from tool schemas while
preserving properties named "deprecated" as legitimate field names.
---
 internal/util/gemini_schema_test.go | 32 +++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/internal/util/gemini_schema_test.go b/internal/util/gemini_schema_test.go
index bb06e95673..d8f318c3bd 100644
--- a/internal/util/gemini_schema_test.go
+++ b/internal/util/gemini_schema_test.go
@@ -921,6 +921,38 @@ func TestCleanJSONSchemaForGemini_RemovesGeminiUnsupportedMetadataFields(t *test
 	compareJSON(t, expected, result)
 }
 
+func TestCleanJSONSchemaForGemini_RemovesDeprecatedField(t *testing.T) {
+	input := `{
+		"type": "object",
+		"properties": {
+			"old_field": {
+				"type": "string",
+				"deprecated": true
+			},
+			"deprecated": {
+				"type": "string",
+				"description": "property named deprecated should not be removed"
+			}
+		}
+	}`
+
+	expected := `{
+		"type": "object",
+		"properties": {
+			"old_field": {
+				"type": "string"
+			},
+			"deprecated": {
+				"type": "string",
+				"description": "property named deprecated should not be removed"
+			}
+		}
+	}`
+
+	result := CleanJSONSchemaForGemini(input)
+	compareJSON(t, expected, result)
+}
+
 func TestRemoveExtensionFields(t *testing.T) {
 	tests := []struct {
 		name     string