diff --git a/scripts/agent/run-selected-prompt.mjs b/scripts/agent/run-selected-prompt.mjs
new file mode 100644
index 0000000..4b94263
--- /dev/null
+++ b/scripts/agent/run-selected-prompt.mjs
@@ -0,0 +1,74 @@
+#!/usr/bin/env node
+import fs from 'node:fs/promises';
+import path from 'node:path';
+import { spawn } from 'node:child_process';
+
+const REQUIRED_ENV = ['SCHEDULER_PROMPT_PATH', 'SCHEDULER_AGENT', 'SCHEDULER_CADENCE'];
+
+function fail(message, code = 1) {
+  console.error(`[scheduler] ${message}`);
+  process.exit(code);
+}
+
+function resolveRunner(promptMarkdown) {
+  const customRunner = process.env.SCHEDULER_AGENT_RUNNER_COMMAND?.trim();
+  if (customRunner) {
+    return { command: 'bash', args: ['-lc', customRunner] };
+  }
+
+  const platform = (process.env.AGENT_PLATFORM || 'codex').trim().toLowerCase();
+  if (platform === 'codex') {
+    return { command: 'codex', args: ['exec', promptMarkdown] };
+  }
+
+  if (platform === 'claude') {
+    return { command: 'claude', args: ['-p', promptMarkdown] };
+  }
+
+  fail(`Unsupported AGENT_PLATFORM="${platform}". Set SCHEDULER_AGENT_RUNNER_COMMAND to override.`);
+}
+
+async function main() {
+  for (const key of REQUIRED_ENV) {
+    if (!process.env[key] || !String(process.env[key]).trim()) {
+      fail(`Missing required environment variable ${key}.`);
+    }
+  }
+
+  const promptPath = path.resolve(process.cwd(), process.env.SCHEDULER_PROMPT_PATH);
+  let promptMarkdown;
+
+  try {
+    promptMarkdown = await fs.readFile(promptPath, 'utf8');
+  } catch {
+    fail(`Unable to read scheduler prompt at ${promptPath}.`);
+  }
+
+  if (!promptMarkdown.trim()) {
+    fail(`Scheduler prompt at ${promptPath} is empty.`);
+  }
+
+  const runner = resolveRunner(promptMarkdown);
+  const child = spawn(runner.command, runner.args, {
+    cwd: process.cwd(),
+    env: {
+      ...process.env,
+      SCHEDULER_PROMPT_PATH: promptPath,
+      SCHEDULER_PROMPT_MARKDOWN: promptMarkdown,
+    },
+    stdio: 'inherit',
+  });
+
+  child.on('error', (error) => {
+    if (error.code === 'ENOENT') {
+      fail(`Runner command not found: ${runner.command}`, 127);
+    }
+    fail(`Runner execution failed: ${error.message}`);
+  });
+
+  child.on('close', (code) => {
+    process.exit(code ?? 1);
+  });
+}
+
+main();
diff --git a/test/run-selected-prompt.test.mjs b/test/run-selected-prompt.test.mjs
new file mode 100644
index 0000000..c772916
--- /dev/null
+++ b/test/run-selected-prompt.test.mjs
@@ -0,0 +1,71 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import fs from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
+import { spawn } from 'node:child_process';
+
+const SCRIPT_PATH = path.resolve('scripts/agent/run-selected-prompt.mjs');
+
+function runScript({ cwd, env }) {
+  return new Promise((resolve) => {
+    const child = spawn(process.execPath, [SCRIPT_PATH], {
+      cwd,
+      env,
+      stdio: ['ignore', 'pipe', 'pipe'],
+    });
+
+    let stdout = '';
+    let stderr = '';
+
+    child.stdout.on('data', (chunk) => {
+      stdout += chunk.toString();
+    });
+
+    child.stderr.on('data', (chunk) => {
+      stderr += chunk.toString();
+    });
+
+    child.on('close', (code) => {
+      resolve({ code: code ?? 1, stdout, stderr });
+    });
+  });
+}
+
+test('runs selected scheduler prompt through configured runner command', async () => {
+  const root = await fs.mkdtemp(path.join(os.tmpdir(), 'run-selected-prompt-'));
+  const promptPath = path.join(root, 'prompt.md');
+  await fs.writeFile(promptPath, '# hello from prompt\n', 'utf8');
+
+  const result = await runScript({
+    cwd: root,
+    env: {
+      ...process.env,
+      SCHEDULER_PROMPT_PATH: promptPath,
+      SCHEDULER_AGENT: 'agent-a',
+      SCHEDULER_CADENCE: 'daily',
+      SCHEDULER_AGENT_RUNNER_COMMAND: 'node -e "if(!process.env.SCHEDULER_PROMPT_MARKDOWN.includes(\'hello from prompt\')) process.exit(6)"',
+    },
+  });
+
+  assert.equal(result.code, 0, `stdout: ${result.stdout}\nstderr: ${result.stderr}`);
+});
+
+test('propagates non-zero runner exit code', async () => {
+  const root = await fs.mkdtemp(path.join(os.tmpdir(), 'run-selected-prompt-fail-'));
+  const promptPath = path.join(root, 'prompt.md');
+  await fs.writeFile(promptPath, '# will fail\n', 'utf8');
+
+  const result = await runScript({
+    cwd: root,
+    env: {
+      ...process.env,
+      SCHEDULER_PROMPT_PATH: promptPath,
+      SCHEDULER_AGENT: 'agent-b',
+      SCHEDULER_CADENCE: 'weekly',
+      SCHEDULER_AGENT_RUNNER_COMMAND: 'node -e "process.exit(7)"',
+    },
+  });
+
+  assert.equal(result.code, 7, `stdout: ${result.stdout}\nstderr: ${result.stderr}`);
+});
diff --git a/torch-config.json b/torch-config.json
index 9827335..c491b72 100644
--- a/torch-config.json
+++ b/torch-config.json
@@ -19,8 +19,8 @@
       "weekly": "bug-reproducer-agent"
     },
     "handoffCommandByCadence": {
-      "daily": "test -n \"$SCHEDULER_AGENT\" && test -n \"$SCHEDULER_CADENCE\" && test -n \"$SCHEDULER_PROMPT_PATH\" && test -f \"$SCHEDULER_PROMPT_PATH\" && echo \"HANDOFF_OK cadence=$SCHEDULER_CADENCE agent=$SCHEDULER_AGENT prompt=$SCHEDULER_PROMPT_PATH\"",
-      "weekly": "test -n \"$SCHEDULER_AGENT\" && test -n \"$SCHEDULER_CADENCE\" && test -n \"$SCHEDULER_PROMPT_PATH\" && test -f \"$SCHEDULER_PROMPT_PATH\" && echo \"HANDOFF_OK cadence=$SCHEDULER_CADENCE agent=$SCHEDULER_AGENT prompt=$SCHEDULER_PROMPT_PATH\""
+      "daily": "node scripts/agent/run-selected-prompt.mjs",
+      "weekly": "node scripts/agent/run-selected-prompt.mjs"
     },
     "memoryPolicyByCadence": {
       "daily": {