From 25cb2be61938e1d64377cc0908084356c7210638 Mon Sep 17 00:00:00 2001
From: Aiden Cline <63023139+rekram1-node@users.noreply.github.com>
Date: Tue, 16 Jun 2026 10:27:20 -0400
Subject: [PATCH] fix(mcp): default tool schema properties (#32568)

---
 packages/opencode/src/session/tools.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/opencode/src/session/tools.ts b/packages/opencode/src/session/tools.ts
index b3bb085a3..87582ce07 100644
--- a/packages/opencode/src/session/tools.ts
+++ b/packages/opencode/src/session/tools.ts
@@ -119,7 +119,7 @@ export const resolve = Effect.fn("SessionTools.resolve")(function* (input: {
     if (!execute) continue
 
     const schema = yield* Effect.promise(() => Promise.resolve(asSchema(item.inputSchema).jsonSchema))
-    const transformed = ProviderTransform.schema(input.model, schema)
+    const transformed = ProviderTransform.schema(input.model, { ...schema, properties: schema.properties ?? {} })
     item.inputSchema = jsonSchema(transformed)
     item.execute = (args, opts) =>
       run.promise(