diff --git a/packages/opencode/test/server/session-diff-missing-patch.test.ts b/packages/opencode/test/server/session-diff-missing-patch.test.ts
index e85632dbf2..5f27a4e2fd 100644
--- a/packages/opencode/test/server/session-diff-missing-patch.test.ts
+++ b/packages/opencode/test/server/session-diff-missing-patch.test.ts
@@ -45,7 +45,10 @@ describe("session diff with missing patch (#26574)", () => {
           directory: tmp.path,
           fn: async () => {
             const session = await Effect.runPromise(
-              Effect.provide(Session.Service.use((s) => s.create({ title: "missing-patch" })), Session.defaultLayer),
+              Effect.provide(
+                Session.Service.use((s) => s.create({ title: "missing-patch" })),
+                Session.defaultLayer,
+              ),
             )
 
             // Mimic legacy/imported on-disk shape: a diff entry with no
@@ -61,10 +64,9 @@ describe("session diff with missing patch (#26574)", () => {
             )
 
             const headers = { "x-opencode-directory": tmp.path }
-            const response = await Server.Default().app.request(
-              pathFor(SessionPaths.diff, { sessionID: session.id }),
-              { headers },
-            )
+            const response = await Server.Default().app.request(pathFor(SessionPaths.diff, { sessionID: session.id }), {
+              headers,
+            })
             expect(response.status).toBe(200)
             const body = (await response.json()) as Array<{ file: string; patch?: string; additions: number }>
             expect(body).toHaveLength(1)
diff --git a/packages/sdk/js/src/v2/gen/types.gen.ts b/packages/sdk/js/src/v2/gen/types.gen.ts
index 6a0ba21027..5a79ae2661 100644
--- a/packages/sdk/js/src/v2/gen/types.gen.ts
+++ b/packages/sdk/js/src/v2/gen/types.gen.ts
@@ -1520,7 +1520,7 @@ export type VcsFileStatus = {
 
 export type VcsFileDiff = {
   file: string
-  patch: string
+  patch?: string
   additions: number
   deletions: number
   status?: "added" | "deleted" | "modified"
diff --git a/packages/sdk/openapi.json b/packages/sdk/openapi.json
index 127d48a58c..32c9a0922a 100644
--- a/packages/sdk/openapi.json
+++ b/packages/sdk/openapi.json
@@ -13039,7 +13039,7 @@
             "enum": ["added", "deleted", "modified"]
           }
         },
-        "required": ["file", "patch", "additions", "deletions"],
+        "required": ["file", "additions", "deletions"],
         "additionalProperties": false
       },
       "VcsApplyError": {