From f87016a5fee795c5ea97436e3a707d3ad42b592b Mon Sep 17 00:00:00 2001
From: Peter Steinberger <steipete@gmail.com>
Date: Wed, 14 Jan 2026 23:27:47 +0000
Subject: [PATCH] fix: handle unsigned tool calls for gemini 3

---
 patches/@mariozechner__pi-ai@0.45.7.patch | 52 +++++++++++++++++++++++
 pnpm-lock.yaml                            | 10 ++---
 2 files changed, 57 insertions(+), 5 deletions(-)

diff --git a/patches/@mariozechner__pi-ai@0.45.7.patch b/patches/@mariozechner__pi-ai@0.45.7.patch
index 82f4d5819..e21f645a8 100644
--- a/patches/@mariozechner__pi-ai@0.45.7.patch
+++ b/patches/@mariozechner__pi-ai@0.45.7.patch
@@ -79,3 +79,55 @@ index 5f9a17e..48631a7 100644
 -//# sourceMappingURL=openai-responses.js.map
 \ No newline at end of file
 +//# sourceMappingURL=openai-responses.js.map
+diff --git a/dist/providers/google-shared.js b/dist/providers/google-shared.js
+index 47dc045..706157a 100644
+--- a/dist/providers/google-shared.js
++++ b/dist/providers/google-shared.js
+@@ -130,18 +130,30 @@
+                     }
+                 }
+                 else if (block.type === "toolCall") {
+-                    const part = {
+-                        functionCall: {
+-                            name: block.name,
+-                            args: block.arguments,
+-                            ...(requiresToolCallId(model.id) ? { id: block.id } : {}),
+-                        },
+-                    };
+                     const thoughtSignature = resolveThoughtSignature(isSameProviderAndModel, block.thoughtSignature);
+-                    if (thoughtSignature) {
+-                        part.thoughtSignature = thoughtSignature;
++                    // Gemini 3 requires thoughtSignature on all function calls when thinking mode is enabled.
++                    // When switching from a provider that doesn't support signatures (e.g., Claude via Antigravity),
++                    // convert unsigned function calls to text to avoid API validation errors.
++                    const isGemini3 = model.id.toLowerCase().includes("gemini-3");
++                    if (isGemini3 && !thoughtSignature) {
++                        const argsStr = JSON.stringify(block.arguments, null, 2);
++                        parts.push({
++                            text: `[Tool Call: ${block.name}]\nArguments: ${argsStr}`,
++                        });
++                    }
++                    else {
++                        const part = {
++                            functionCall: {
++                                name: block.name,
++                                args: block.arguments,
++                                ...(requiresToolCallId(model.id) ? { id: block.id } : {}),
++                            },
++                        };
++                        if (thoughtSignature) {
++                            part.thoughtSignature = thoughtSignature;
++                        }
++                        parts.push(part);
+                     }
+-                    parts.push(part);
+                 }
+             }
+             if (parts.length === 0)
+@@ -280,4 +292,4 @@
+             return "error";
+     }
+ }
+-//# sourceMappingURL=google-shared.js.map
+\ No newline at end of file
++//# sourceMappingURL=google-shared.js.map
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 7266472d5..edd6fa07b 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -9,7 +9,7 @@ overrides:
 
 patchedDependencies:
   '@mariozechner/pi-ai@0.45.7':
-    hash: 899187c39b551e0b611a32006f5f06bc329d3478fe4bac9bac044b2df079e2cd
+    hash: e8b10ed06e0bcda571016bc4979ef2c5bf8a99ccade0201a3f74bc1914754fe9
     path: patches/@mariozechner__pi-ai@0.45.7.patch
 
 importers:
@@ -36,7 +36,7 @@ importers:
         version: 0.45.3(ws@8.19.0)(zod@4.3.5)
       '@mariozechner/pi-ai':
         specifier: 0.45.7
-        version: 0.45.7(patch_hash=899187c39b551e0b611a32006f5f06bc329d3478fe4bac9bac044b2df079e2cd)(ws@8.19.0)(zod@4.3.5)
+        version: 0.45.7(patch_hash=e8b10ed06e0bcda571016bc4979ef2c5bf8a99ccade0201a3f74bc1914754fe9)(ws@8.19.0)(zod@4.3.5)
       '@mariozechner/pi-coding-agent':
         specifier: ^0.45.3
         version: 0.45.3(ws@8.19.0)(zod@4.3.5)
@@ -5067,7 +5067,7 @@ snapshots:
 
   '@mariozechner/pi-agent-core@0.45.3(ws@8.19.0)(zod@4.3.5)':
     dependencies:
-      '@mariozechner/pi-ai': 0.45.7(patch_hash=899187c39b551e0b611a32006f5f06bc329d3478fe4bac9bac044b2df079e2cd)(ws@8.19.0)(zod@4.3.5)
+      '@mariozechner/pi-ai': 0.45.7(patch_hash=e8b10ed06e0bcda571016bc4979ef2c5bf8a99ccade0201a3f74bc1914754fe9)(ws@8.19.0)(zod@4.3.5)
       '@mariozechner/pi-tui': 0.45.3
     transitivePeerDependencies:
       - '@modelcontextprotocol/sdk'
@@ -5078,7 +5078,7 @@ snapshots:
       - ws
       - zod
 
-  '@mariozechner/pi-ai@0.45.7(patch_hash=899187c39b551e0b611a32006f5f06bc329d3478fe4bac9bac044b2df079e2cd)(ws@8.19.0)(zod@4.3.5)':
+  '@mariozechner/pi-ai@0.45.7(patch_hash=e8b10ed06e0bcda571016bc4979ef2c5bf8a99ccade0201a3f74bc1914754fe9)(ws@8.19.0)(zod@4.3.5)':
     dependencies:
       '@anthropic-ai/sdk': 0.71.2(zod@4.3.5)
       '@aws-sdk/client-bedrock-runtime': 3.967.0
@@ -5105,7 +5105,7 @@ snapshots:
       '@mariozechner/clipboard': 0.3.0
       '@mariozechner/jiti': 2.6.2
       '@mariozechner/pi-agent-core': 0.45.3(ws@8.19.0)(zod@4.3.5)
-      '@mariozechner/pi-ai': 0.45.7(patch_hash=899187c39b551e0b611a32006f5f06bc329d3478fe4bac9bac044b2df079e2cd)(ws@8.19.0)(zod@4.3.5)
+      '@mariozechner/pi-ai': 0.45.7(patch_hash=e8b10ed06e0bcda571016bc4979ef2c5bf8a99ccade0201a3f74bc1914754fe9)(ws@8.19.0)(zod@4.3.5)
       '@mariozechner/pi-tui': 0.45.3
       chalk: 5.6.2
       cli-highlight: 2.1.11