diff --git a/docs/rule-cases.json b/docs/rule-cases.json
new file mode 100644
index 0000000..500969f
--- /dev/null
+++ b/docs/rule-cases.json
@@ -0,0 +1,54 @@
+{
+  "config": {
+    "enabled": true,
+    "discordOnly": true,
+    "bypassUserIds": ["561921120408698910"],
+    "endSymbols": ["。", "！", "？", ".", "!", "?"]
+  },
+  "cases": [
+    {
+      "name": "non-discord skips gate",
+      "channel": "telegram",
+      "senderId": "u1",
+      "content": "hello",
+      "expect": {
+        "shouldUseNoReply": false,
+        "reason": "non_discord",
+        "injectEndMarker": false
+      }
+    },
+    {
+      "name": "bypass sender injects end marker",
+      "channel": "discord",
+      "senderId": "561921120408698910",
+      "content": "hello",
+      "expect": {
+        "shouldUseNoReply": false,
+        "reason": "bypass_sender",
+        "injectEndMarker": true
+      }
+    },
+    {
+      "name": "ending punctuation injects end marker",
+      "channel": "discord",
+      "senderId": "u2",
+      "content": "你好！",
+      "expect": {
+        "shouldUseNoReply": false,
+        "reason": "end_symbol:！",
+        "injectEndMarker": true
+      }
+    },
+    {
+      "name": "no ending punctuation triggers no-reply override",
+      "channel": "discord",
+      "senderId": "u2",
+      "content": "继续",
+      "expect": {
+        "shouldUseNoReply": true,
+        "reason": "rule_match_no_end_symbol",
+        "injectEndMarker": false
+      }
+    }
+  ]
+}
diff --git a/plugin/package.json b/plugin/package.json
index 9095670..35b00ba 100644
--- a/plugin/package.json
+++ b/plugin/package.json
@@ -5,6 +5,7 @@
   "type": "module",
   "description": "WhisperGate OpenClaw plugin",
   "scripts": {
-    "check": "node ../scripts/check-plugin-files.mjs"
+    "check": "node ../scripts/check-plugin-files.mjs",
+    "check:rules": "node ../scripts/validate-rules.mjs"
   }
 }
diff --git a/scripts/validate-rules.mjs b/scripts/validate-rules.mjs
new file mode 100644
index 0000000..4c74bc6
--- /dev/null
+++ b/scripts/validate-rules.mjs
@@ -0,0 +1,64 @@
+import fs from "node:fs";
+import path from "node:path";
+
+function getLastChar(input) {
+  const t = (input || "").trim();
+  return t.length ? t[t.length - 1] : "";
+}
+
+function evaluateDecision({ config, channel, senderId, content }) {
+  if (config.enabled === false) {
+    return { shouldUseNoReply: false, reason: "disabled" };
+  }
+
+  const ch = (channel || "").toLowerCase();
+  if (config.discordOnly !== false && ch !== "discord") {
+    return { shouldUseNoReply: false, reason: "non_discord" };
+  }
+
+  if (senderId && (config.bypassUserIds || []).includes(senderId)) {
+    return { shouldUseNoReply: false, reason: "bypass_sender" };
+  }
+
+  const last = getLastChar(content || "");
+  if (last && (config.endSymbols || []).includes(last)) {
+    return { shouldUseNoReply: false, reason: `end_symbol:${last}` };
+  }
+
+  return { shouldUseNoReply: true, reason: "rule_match_no_end_symbol" };
+}
+
+function shouldInjectEndMarker(reason) {
+  return reason === "bypass_sender" || String(reason).startsWith("end_symbol:");
+}
+
+const fixturePath = path.join(process.cwd(), "docs", "rule-cases.json");
+const payload = JSON.parse(fs.readFileSync(fixturePath, "utf8"));
+
+let ok = true;
+for (const c of payload.cases || []) {
+  const d = evaluateDecision({
+    config: payload.config,
+    channel: c.channel,
+    senderId: c.senderId,
+    content: c.content,
+  });
+
+  const inject = shouldInjectEndMarker(d.reason);
+  const pass =
+    d.shouldUseNoReply === c.expect.shouldUseNoReply &&
+    d.reason === c.expect.reason &&
+    inject === c.expect.injectEndMarker;
+
+  if (!pass) {
+    ok = false;
+    console.error(`FAIL ${c.name}`);
+    console.error(`  got:    ${JSON.stringify({ ...d, injectEndMarker: inject })}`);
+    console.error(`  expect: ${JSON.stringify(c.expect)}`);
+  } else {
+    console.log(`OK   ${c.name}`);
+  }
+}
+
+if (!ok) process.exit(1);
+console.log("all rule cases passed");