Initial commit: Discord-Claude Gateway with event-driven agent runtime

src/agent-runtime.ts

@@ -1,4 +1,8 @@
 import { execFile } from "node:child_process";
+import { writeFile, unlink } from "node:fs/promises";
+import { join } from "node:path";
+import { tmpdir } from "node:os";
+import { randomUUID } from "node:crypto";
 import type { Event, MessagePayload, HeartbeatPayload, CronPayload, HookPayload } from "./event-queue.js";
 import type { MarkdownConfigLoader } from "./markdown-config-loader.js";
 import type { SystemPromptAssembler } from "./system-prompt-assembler.js";
@@ -145,40 +149,53 @@ export class AgentRuntime {
     }
   }
 
-  private executeClaude(
+  private async executeClaude(
     promptText: string,
     systemPrompt: string,
     sessionId?: string,
+  ): Promise<ClaudeJsonResponse> {
+    // Write system prompt to a temp file to avoid CLI arg length limits
+    const tmpFile = join(tmpdir(), `aetheel-prompt-${randomUUID()}.txt`);
+    await writeFile(tmpFile, systemPrompt, "utf-8");
+
+    try {
+      return await this.runClaude(promptText, tmpFile, sessionId);
+    } finally {
+      unlink(tmpFile).catch(() => {});
+    }
+  }
+
+  private runClaude(
+    promptText: string,
+    systemPromptFile: string,
+    sessionId?: string,
   ): Promise<ClaudeJsonResponse> {
     return new Promise((resolve, reject) => {
       const args: string[] = [
         "-p", promptText,
         "--output-format", "json",
-        "--system-prompt", systemPrompt,
+        "--system-prompt-file", systemPromptFile,
         "--dangerously-skip-permissions",
       ];
 
-      // Resume existing session
       if (sessionId) {
         args.push("--resume", sessionId);
       }
 
-      // Allowed tools
       if (this.config.allowedTools.length > 0) {
         args.push("--allowedTools", ...this.config.allowedTools);
       }
 
-      // Max turns to prevent runaway loops
       args.push("--max-turns", "25");
 
-      console.log(`[DEBUG] Spawning Claude CLI: ${this.config.claudeCliPath} ${args.slice(0, 4).join(" ")} ... (${args.length} args total)`);
+      console.log(`[DEBUG] Spawning Claude CLI: ${this.config.claudeCliPath} -p "${promptText}" --output-format json --system-prompt-file ${systemPromptFile} ... (${args.length} args total)`);
 
       const child = execFile(
         this.config.claudeCliPath,
         args,
         {
           timeout: this.config.queryTimeoutMs,
-          maxBuffer: 10 * 1024 * 1024, // 10MB
+          maxBuffer: 10 * 1024 * 1024,
           encoding: "utf-8",
         },
         (error, stdout, stderr) => {