feat: add /add-guild slash command

plugin/commands/add-guild-command.ts

@@ -0,0 +1,59 @@
+import type { OpenClawPluginApi } from "openclaw/plugin-sdk";
+import { execFileSync } from "node:child_process";
+import path from "node:path";
+import os from "node:os";
+
+export function registerAddGuildCommand(api: OpenClawPluginApi): void {
+  api.registerCommand({
+    name: "add-guild",
+    description: "Add a Discord guild to the discord-guilds skill",
+    acceptsArgs: true,
+    handler: async (cmdCtx) => {
+      const args = (cmdCtx.args || "").trim();
+      if (!args) {
+        return {
+          text: "Usage: /add-guild <guild-id> <description>\nExample: /add-guild 123456789012345678 \"Production server\"",
+          isError: true,
+        };
+      }
+
+      const parts = args.split(/\s+/);
+      if (parts.length < 2) {
+        return {
+          text: "Error: Both guild-id and description are required.\nUsage: /add-guild <guild-id> <description>",
+          isError: true,
+        };
+      }
+
+      const guildId = parts[0];
+      const description = parts.slice(1).join(" ");
+
+      // Validate guild ID
+      if (!/^\d+$/.test(guildId)) {
+        return {
+          text: "Error: guild-id must be a numeric Discord snowflake (e.g., 123456789012345678)",
+          isError: true,
+        };
+      }
+
+      // Resolve the skill script path
+      const openClawDir = (api.config as Record<string, unknown>)?.["dirigentStateDir"] as string || path.join(os.homedir(), ".openclaw");
+      const scriptPath = path.join(openClawDir, "skills", "discord-guilds", "scripts", "add-guild");
+
+      try {
+        const result = execFileSync(process.execPath, [scriptPath, guildId, description], {
+          encoding: "utf8",
+          timeout: 5000,
+        });
+        return { text: result.trim() };
+      } catch (e: any) {
+        const stderr = e?.stderr?.toString?.() || "";
+        const stdout = e?.stdout?.toString?.() || "";
+        return {
+          text: `Failed to add guild: ${stderr || stdout || String(e)}`,
+          isError: true,
+        };
+      }
+    },
+  });
+}