diff --git a/.gitea/workflows/server-deploy.yml b/.gitea/workflows/server-deploy.yml
index a154741..bcba95d 100644
--- a/.gitea/workflows/server-deploy.yml
+++ b/.gitea/workflows/server-deploy.yml
@@ -103,6 +103,14 @@ jobs:
           fi
           chmod 600 ~/.ssh/id_rsa
 
+          # 自检（不输出私钥内容，仅输出元信息，方便定位是否写入了错误文件/被截断）
+          echo "id_rsa 字节数：$(wc -c < ~/.ssh/id_rsa | tr -d ' ')"
+          echo "id_rsa 首行：$(head -n 1 ~/.ssh/id_rsa | tr -d '\r')"
+          echo "id_rsa 末行：$(tail -n 1 ~/.ssh/id_rsa | tr -d '\r')"
+          if command -v sha256sum >/dev/null 2>&1; then
+            echo "id_rsa sha256(前12位)：$(sha256sum ~/.ssh/id_rsa | awk '{print substr($1,1,12)}')"
+          fi
+
           # 快速校验私钥是否可解析（不会输出私钥内容）
           if ! ssh-keygen -y -f ~/.ssh/id_rsa >/dev/null 2>~/.ssh/ssh_key_check.err; then
             echo "SSH 私钥无法解析。下面是 ssh-keygen 的报错（不包含私钥内容）："