feat: add Node.js worker with Claude Code SDK

worker/Dockerfile

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+FROM node:20-slim
+
+RUN apt-get update && apt-get install -y wget && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY package.json ./
+RUN npm install --production
+
+COPY index.js ./
+
+EXPOSE 3001
+
+CMD ["node", "index.js"]

worker/index.js

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+import express from "express";
+import { query } from "@anthropic-ai/claude-code";
+
+const app = express();
+app.use(express.json({ limit: "10mb" }));
+
+const PORT = process.env.WORKER_PORT || 3001;
+const DEFAULT_MODEL = process.env.CLAUDE_MODEL || "claude-sonnet-4-6";
+
+app.get("/health", (_req, res) => {
+  res.json({ status: "ok" });
+});
+
+app.post("/process", async (req, res) => {
+  const { prompt, system_prompt, model, session_id } = req.body;
+
+  if (!prompt) {
+    return res
+      .status(400)
+      .json({ success: false, error: "prompt is required" });
+  }
+
+  try {
+    const options = {
+      model: model || DEFAULT_MODEL,
+      systemPrompt: system_prompt || undefined,
+      allowedTools: [],
+    };
+
+    if (session_id) {
+      options.resume = session_id;
+    }
+
+    const messages = await query({
+      prompt,
+      options,
+    });
+
+    const resultText = messages
+      .filter((m) => m.type === "text")
+      .map((m) => m.text)
+      .join("\n");
+
+    const conversationId = messages.length > 0 ? messages[0].conversationId : null;
+
+    res.json({
+      success: true,
+      result: resultText,
+      session_id: conversationId || session_id,
+    });
+  } catch (error) {
+    console.error("Process error:", error.message);
+    res.json({
+      success: false,
+      error: error.message,
+    });
+  }
+});
+
+app.post("/summarize", async (req, res) => {
+  const { exchanges, mode } = req.body;
+
+  if (!exchanges || exchanges.length === 0) {
+    return res
+      .status(400)
+      .json({ success: false, error: "exchanges is required" });
+  }
+
+  const exchangeText = exchanges
+    .map((e, i) => `Exchange ${i + 1}:\nQ: ${e.prompt}\nA: ${e.result}`)
+    .join("\n\n");
+
+  const summaryPrompt =
+    mode === "complete"
+      ? `Summarize these exchanges into a comprehensive overview. Be concise but thorough:\n\n${exchangeText}`
+      : `Summarize this exchange in 1-2 sentences:\n\n${exchangeText}`;
+
+  try {
+    const messages = await query({
+      prompt: summaryPrompt,
+      options: {
+        model: DEFAULT_MODEL,
+        systemPrompt:
+          "You are a summarizer. Respond with only the summary, no preamble.",
+        allowedTools: [],
+      },
+    });
+
+    const summaryText = messages
+      .filter((m) => m.type === "text")
+      .map((m) => m.text)
+      .join("\n");
+
+    res.json({
+      success: true,
+      summary: summaryText.trim(),
+    });
+  } catch (error) {
+    console.error("Summarize error:", error.message);
+    res.json({
+      success: false,
+      error: error.message,
+    });
+  }
+});
+
+app.listen(PORT, () => {
+  console.log(`Worker listening on port ${PORT}`);
+});

worker/package.json

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+{
+  "name": "opus-agent-worker",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "dependencies": {
+    "express": "^4.21.0",
+    "@anthropic-ai/claude-code": "^1.0.0"
+  }
+}