src/agent/identity.ts

@@ -4,6 +4,8 @@ import * as YAML from "yaml";
 import { ZodError } from "zod";
 import { AgentYamlSchema } from "./schema";
 import type { AgentYaml as AgentIdentity } from "./schema";
+import { DEFAULT_MODEL } from "../config/models";
+import type { AllowedModel } from "../config/models";
 
 export type { AgentYaml as AgentIdentity } from "./schema";
 
@@ -44,7 +46,8 @@ export function createAgentYaml(
   workspacePath: string,
   name: string,
   role: string,
-  channelId: string
+  channelId: string,
+  model: AllowedModel = DEFAULT_MODEL
 ): void {
   const identity: AgentIdentity = {
     name,
@@ -54,6 +57,7 @@ export function createAgentYaml(
       .join(" "),
     role,
     channel_id: channelId,
+    model,
   };
 
   const yamlContent = YAML.stringify(identity);
@@ -169,13 +173,14 @@ export function setupAgentWorkspace(
   workspacePath: string,
   name: string,
   role: string,
-  channelId: string
+  channelId: string,
+  model: AllowedModel = DEFAULT_MODEL
 ): void {
   // Ensure workspace directory exists
   fs.mkdirSync(workspacePath, { recursive: true });
 
   // Create all required files
-  createAgentYaml(workspacePath, name, role, channelId);
+  createAgentYaml(workspacePath, name, role, channelId, model);
   createClaudeMd(workspacePath, name, role);
   createClaudeConfig(workspacePath);
 }

src/agent/runner.ts

@@ -7,6 +7,7 @@ import { resolveClaude } from "../runtime/resolve-claude";
 import { sanitizedEnv } from "../runtime/env";
 import { Semaphore } from "../runtime/concurrency";
 import type { RunResult } from "./types";
+import { DEFAULT_MODEL } from "../config/models";
 
 // ---------------------------------------------------------------------------
 // Module-level semaphore — lazy-initialised on first runAgent() call so the
@@ -206,11 +207,14 @@ export async function runAgent(options: RunAgentOptions): Promise<RunResult> {
     // ~/.disclaw/workspaces/ (outside the DisClaw repo), so walk-up will never
     // reach the DisClaw project CLAUDE.md. The workspace CLAUDE.md is picked up
     // automatically because cwd is set to workspacePath.
+    const model = identity.model ?? DEFAULT_MODEL;
     const args = [
       "-p",
       prompt,
       "--output-format",
       "json",
+      "--model",
+      model,
     ];
 
     const child = spawn(claudeCommand, args, {

src/agent/schema.ts

@@ -1,10 +1,14 @@
 import { z } from "zod";
+import { ALLOWED_MODELS, DEFAULT_MODEL } from "../config/models";
 
 export const AgentYamlSchema = z.object({
   name: z.string().min(1),
   display_name: z.string().optional(),
   role: z.string().optional(),
   channel_id: z.string().min(1),
+  model: z
+    .enum(ALLOWED_MODELS.map((m) => m.id) as [string, ...string[]])
+    .default(DEFAULT_MODEL),
 });
 
 export type AgentYaml = z.infer<typeof AgentYamlSchema>;

src/commands/new-agent.ts

@@ -3,11 +3,17 @@ import {
   ChannelType,
   SlashCommandBuilder,
   Guild,
+  ActionRowBuilder,
+  StringSelectMenuBuilder,
+  StringSelectMenuInteraction,
+  ComponentType,
 } from "discord.js";
 import * as path from "path";
 import { DisclawDatabase } from "../db/database";
 import { DisclawConfig } from "../config/loader";
 import { setupAgentWorkspace } from "../agent/identity";
+import { ALLOWED_MODELS, DEFAULT_MODEL } from "../config/models";
+import type { AllowedModel } from "../config/models";
 
 // Allowed characters for agent names: lowercase letters, numbers, hyphens
 const NAME_PATTERN = /^[a-z0-9][a-z0-9-]{0,30}[a-z0-9]$/;
@@ -82,7 +88,50 @@ export async function handleNewAgent(
     return;
   }
 
-  await interaction.deferReply();
+  // Model selection via ephemeral select menu (before deferring the final reply)
+  const modelSelect = new StringSelectMenuBuilder()
+    .setCustomId("model-select")
+    .setPlaceholder("Modell auswählen …")
+    .addOptions(
+      ALLOWED_MODELS.map((m) => ({
+        label: m.label,
+        value: m.id,
+        default: m.id === DEFAULT_MODEL,
+      }))
+    );
+
+  const row = new ActionRowBuilder<StringSelectMenuBuilder>().addComponents(
+    modelSelect
+  );
+
+  await interaction.reply({
+    content: `Welches Modell soll **${name}** verwenden?`,
+    components: [row],
+    ephemeral: true,
+  });
+
+  let selectedModel: AllowedModel = DEFAULT_MODEL;
+
+  try {
+    const selectInteraction = await interaction.channel!.awaitMessageComponent<ComponentType.StringSelect>({
+      componentType: ComponentType.StringSelect,
+      filter: (i: StringSelectMenuInteraction) =>
+        i.customId === "model-select" && i.user.id === interaction.user.id,
+      time: 60_000,
+    });
+
+    selectedModel = selectInteraction.values[0] as AllowedModel;
+    await selectInteraction.update({
+      content: `Modell **${selectedModel}** ausgewählt. Erstelle Agenten …`,
+      components: [],
+    });
+  } catch {
+    // Timeout or no selection — use default, update the reply
+    await interaction.editReply({
+      content: `Keine Auswahl — verwende Standardmodell **${DEFAULT_MODEL}**. Erstelle Agenten …`,
+      components: [],
+    });
+  }
 
   try {
     // 1. Create Discord channel
@@ -95,17 +144,20 @@ export async function handleNewAgent(
 
     // 2. Create workspace with full Claude Code environment
     const workspacePath = path.resolve(config.workspaces_root, name);
-    setupAgentWorkspace(workspacePath, name, role, channel.id);
+    setupAgentWorkspace(workspacePath, name, role, channel.id, selectedModel);
 
     // 3. Save to database
     db.createWorkspace(channel.id, guild.id, name, workspacePath);
 
     // 4. Reply with confirmation
-    await interaction.editReply(
+    await interaction.editReply({
+      content:
         `Agent **${name}** erstellt in <#${channel.id}>.\n` +
         `Rolle: ${role}\n` +
-        `Workspace: \`${workspacePath}\``
-    );
+        `Modell: ${selectedModel}\n` +
+        `Workspace: \`${workspacePath}\``,
+      components: [],
+    });
 
     // 5. Send welcome message in the new channel
     await channel.send(
@@ -115,6 +167,9 @@ export async function handleNewAgent(
   } catch (error) {
     const msg =
       error instanceof Error ? error.message : "Unbekannter Fehler";
-    await interaction.editReply(`Fehler beim Erstellen des Agenten: ${msg}`);
+    await interaction.editReply({
+      content: `Fehler beim Erstellen des Agenten: ${msg}`,
+      components: [],
+    });
   }
 }

src/config/models.ts

@@ -0,0 +1,8 @@
+export const ALLOWED_MODELS = [
+  { id: "claude-opus-4-6",           label: "Claude Opus 4.6 (leistungsstark, langsamer)" },
+  { id: "claude-sonnet-4-6",         label: "Claude Sonnet 4.6 (Standard, empfohlen)" },
+  { id: "claude-haiku-4-5-20251001", label: "Claude Haiku 4.5 (schnell, günstig)" },
+] as const;
+
+export type AllowedModel = typeof ALLOWED_MODELS[number]["id"];
+export const DEFAULT_MODEL: AllowedModel = "claude-sonnet-4-6";

tests/unit/runner-model.test.ts

@@ -0,0 +1,165 @@
+import { describe, it, expect, vi, beforeEach, afterEach, beforeAll, afterAll } from "vitest";
+import * as fs from "fs";
+import * as os from "os";
+import * as path from "path";
+
+/**
+ * Unit tests for DIS-153: model selection per agent.
+ *
+ * cross-spawn is mocked so no real process is launched.
+ * Each test inspects the args passed to spawn to verify --model is set correctly.
+ */
+
+// ---------------------------------------------------------------------------
+// Spy on the args cross-spawn receives
+// ---------------------------------------------------------------------------
+let capturedArgs: string[] = [];
+
+vi.mock("cross-spawn", () => {
+  function makeMockChild(args: string[]) {
+    capturedArgs = args;
+
+    const stdoutListeners: Record<string, Array<(...a: unknown[]) => void>> = {};
+
+    const stdoutStream = {
+      setEncoding: () => {},
+      on: (event: string, cb: (...a: unknown[]) => void) => {
+        if (!stdoutListeners[event]) stdoutListeners[event] = [];
+        stdoutListeners[event].push(cb);
+
+        if (event === "data") {
+          Promise.resolve().then(() => {
+            for (const handler of stdoutListeners["data"] ?? []) {
+              handler(JSON.stringify({ result: "ok" }));
+            }
+          });
+        }
+      },
+    };
+
+    const listeners: Record<string, Array<(...a: unknown[]) => void>> = {};
+    const emit = (event: string, ...a: unknown[]) => {
+      for (const cb of listeners[event] ?? []) cb(...a);
+    };
+
+    const child = {
+      stdout: stdoutStream,
+      stderr: { setEncoding: () => {}, on: () => {} },
+      stdin: { end: () => {} },
+      on: (event: string, cb: (...a: unknown[]) => void) => {
+        if (!listeners[event]) listeners[event] = [];
+        listeners[event].push(cb);
+
+        if (event === "close") {
+          Promise.resolve()
+            .then(() => Promise.resolve())
+            .then(() => emit("close", 0));
+        }
+      },
+      kill: () => {},
+    };
+
+    return child;
+  }
+
+  return {
+    default: (_cmd: string, args: string[]) => makeMockChild(args),
+  };
+});
+
+import { runAgent, _resetSemaphore } from "../../src/agent/runner";
+import { _resetResolveClaudeCache } from "../../src/runtime/resolve-claude";
+import { AgentYamlSchema } from "../../src/agent/schema";
+
+// ---------------------------------------------------------------------------
+// Shared workspace fixture
+// ---------------------------------------------------------------------------
+
+describe("runner model selection (DIS-153)", () => {
+  let workspaceDir: string;
+  const originalEnv = { ...process.env };
+
+  beforeAll(() => {
+    workspaceDir = fs.mkdtempSync(path.join(os.tmpdir(), "disclaw-model-test-"));
+    fs.writeFileSync(
+      path.join(workspaceDir, "CLAUDE.md"),
+      "# Model Test Agent\nYou are a test agent.\n",
+      "utf-8"
+    );
+  });
+
+  beforeEach(() => {
+    capturedArgs = [];
+    _resetResolveClaudeCache();
+    _resetSemaphore(4);
+    process.env.CLAUDE_PATH = "/fake/claude";
+  });
+
+  afterEach(() => {
+    process.env = { ...originalEnv };
+    _resetResolveClaudeCache();
+  });
+
+  afterAll(() => {
+    try {
+      fs.rmSync(workspaceDir, { recursive: true, force: true });
+    } catch {
+      // best-effort cleanup
+    }
+  });
+
+  // -------------------------------------------------------------------------
+  // Test 1: --model is passed when model is set in agent.yaml
+  // -------------------------------------------------------------------------
+  it("passes --model claude-sonnet-4-6 when model is set in agent.yaml", async () => {
+    fs.writeFileSync(
+      path.join(workspaceDir, "agent.yaml"),
+      `name: model-agent\ndisplay_name: Model Agent\nrole: Testing\nchannel_id: "111"\nmodel: claude-sonnet-4-6\n`,
+      "utf-8"
+    );
+
+    await runAgent({
+      workspacePath: workspaceDir,
+      channelName: "test",
+      userMessage: "hello",
+      conversationHistory: [],
+    });
+
+    const modelIdx = capturedArgs.indexOf("--model");
+    expect(modelIdx).toBeGreaterThan(-1);
+    expect(capturedArgs[modelIdx + 1]).toBe("claude-sonnet-4-6");
+  });
+
+  // -------------------------------------------------------------------------
+  // Test 2: Default model is used when model field is absent from agent.yaml
+  // -------------------------------------------------------------------------
+  it("passes default model when model field is absent from agent.yaml", async () => {
+    fs.writeFileSync(
+      path.join(workspaceDir, "agent.yaml"),
+      `name: model-agent\ndisplay_name: Model Agent\nrole: Testing\nchannel_id: "222"\n`,
+      "utf-8"
+    );
+
+    await runAgent({
+      workspacePath: workspaceDir,
+      channelName: "test",
+      userMessage: "hello",
+      conversationHistory: [],
+    });
+
+    const modelIdx = capturedArgs.indexOf("--model");
+    expect(modelIdx).toBeGreaterThan(-1);
+    // DEFAULT_MODEL is claude-sonnet-4-6
+    expect(capturedArgs[modelIdx + 1]).toBe("claude-sonnet-4-6");
+  });
+
+  // -------------------------------------------------------------------------
+  // Test 3: Invalid model in agent.yaml → Zod validation throws
+  // -------------------------------------------------------------------------
+  it("throws when agent.yaml contains an invalid model value", () => {
+    const rawYaml = `name: bad-model-agent\ndisplay_name: Bad\nrole: Testing\nchannel_id: "333"\nmodel: gpt-4-turbo\n`;
+    const parsed = { name: "bad-model-agent", display_name: "Bad", role: "Testing", channel_id: "333", model: "gpt-4-turbo" };
+
+    expect(() => AgentYamlSchema.parse(parsed)).toThrow();
+  });
+});