diff --git a/README.md b/README.md
index f76c555..7e2df4a 100644
--- a/README.md
+++ b/README.md
@@ -26,7 +26,7 @@ Use this when you want the shortest consumer workflow for `opencode github run`.
 | Input | Default | Description |
 | --- | --- | --- |
 | `model` | empty | Exported as `MODEL` before `opencode github run` |
-| `prompt` | empty | Exported as `PROMPT` before `opencode github run` |
+| `prompt` | built-in PR review template | Exported as `PROMPT` before `opencode github run` |
 | `github-token` | empty | Exported as `GITHUB_TOKEN` before `opencode github run` |
 | `zhipu-api-key` | empty | Exported as `ZHIPU_API_KEY` before `opencode github run` |
 | `opencode-go-api-key` | empty | Exported as `OPENCODE_GO_API_KEY` before `opencode github run` |
diff --git a/github-run-opencode/action.yml b/github-run-opencode/action.yml
index eebdf23..36432d7 100644
--- a/github-run-opencode/action.yml
+++ b/github-run-opencode/action.yml
@@ -57,7 +57,33 @@ inputs:
   prompt:
     description: Value exported as PROMPT before running `opencode github run`.
     required: false
-    default: ""
+    default: |
+      Review this pull request (read-only mode, DO NOT modify any code):
+
+      Please check:
+      - Code quality issues
+      - Potential bugs or logic errors
+      - Code style consistency
+      - Security concerns
+      - Performance issues
+      - Suggest improvements
+
+      Please respond in Chinese. DO NOT modify any code, only provide review comments.
+      The first line of your response must be exactly one of:
+      - 可合并
+      - 有条件合并
+      - 不可合并
+
+      Decision rules:
+      - Use "可合并" only when there are no blocking issues.
+      - Use "有条件合并" when merge is acceptable only after specific issues are fixed.
+      - Use "不可合并" when there are blocking risks, correctness issues, or major concerns that should stop the merge.
+
+      Output format:
+      - First line: the decision only
+      - Then a short summary
+      - Then "阻塞项" listing required fixes for merge; if none, write "阻塞项：无"
+      - Then "建议项" listing non-blocking improvements; if none, write "建议项：无"
   use-github-token:
     description: Value exported as USE_GITHUB_TOKEN before running `opencode github run`.
     required: false