diff --git a/packages/server/src/server/agent/providers/opencode/tool-call-detail-parser.ts b/packages/server/src/server/agent/providers/opencode/tool-call-detail-parser.ts
index 39a7deb8c9..8214ebb1d0 100644
--- a/packages/server/src/server/agent/providers/opencode/tool-call-detail-parser.ts
+++ b/packages/server/src/server/agent/providers/opencode/tool-call-detail-parser.ts
@@ -312,6 +312,10 @@ const OpencodeKnownToolDetailSchema = z.union([
     z.unknown(),
     (input) => toEditToolDetail(input, null),
   ),
+  // OpenCode v2 reports apply_patch as `patch`.
+  toolDetailBranchByToolName("patch", OpencodeApplyPatchTextInputSchema, z.unknown(), (input) =>
+    toEditToolDetail(input, null),
+  ),
   toolDetailBranchByToolName(
     "apply_diff",
     OpencodeEditInputSchema,
diff --git a/packages/server/src/server/agent/providers/opencode/tool-call-mapper.test.ts b/packages/server/src/server/agent/providers/opencode/tool-call-mapper.test.ts
index 54f3faa514..1c9ba212e1 100644
--- a/packages/server/src/server/agent/providers/opencode/tool-call-mapper.test.ts
+++ b/packages/server/src/server/agent/providers/opencode/tool-call-mapper.test.ts
@@ -387,6 +387,34 @@ describe("opencode tool-call mapper", () => {
     });
   });
 
+  it("maps OpenCode v2 patch payloads from GPT models into edit detail", () => {
+    const item = expectMapped(
+      mapOpencodeToolCall({
+        toolName: "patch",
+        callId: "opencode-v2-patch-1",
+        status: "completed",
+        input: {
+          patchText:
+            "*** Begin Patch\n*** Update File: patch.txt\n@@\n-north south\n+NORTH south\n*** End Patch",
+        },
+        output: "Success. Updated the following files:\nM patch.txt",
+      }),
+    );
+
+    expect(item.detail).toEqual({
+      type: "edit",
+      filePath: "patch.txt",
+      unifiedDiff: [
+        "diff --git a/patch.txt b/patch.txt",
+        "--- a/patch.txt",
+        "+++ b/patch.txt",
+        "@@",
+        "-north south",
+        "+NORTH south",
+      ].join("\n"),
+    });
+  });
+
   it("maps unknown tools to unknown detail with raw payloads", () => {
     const item = expectMapped(
       mapOpencodeToolCall({