fix: make Cursor hooks transactional

test/cursor-plugin.test.mjs

@@ -1,9 +1,7 @@
 import assert from 'node:assert/strict';
-import { spawn } from 'node:child_process';
 import {
   lstat,
   mkdir,
-  mkdtemp,
   readFile,
   readdir,
   rm,
@@ -11,140 +9,18 @@ import {
   symlink,
   writeFile,
 } from 'node:fs/promises';
-import os from 'node:os';
 import path from 'node:path';
 import test from 'node:test';
-import { pathToFileURL } from 'node:url';
-
-const pluginModuleUrl = pathToFileURL(path.resolve('dist/plugins/cursor.js')).href;
-const registryModuleUrl = pathToFileURL(path.resolve('dist/plugins/registry.js')).href;
-const ioModuleUrl = pathToFileURL(path.resolve('dist/plugins/cursor-io.js')).href;
-
-function runNode(args, env, cwd, input = '') {
-  return new Promise((resolve, reject) => {
-    const child = spawn(process.execPath, args, {
-      cwd,
-      env: { ...process.env, ...env },
-      stdio: ['pipe', 'pipe', 'pipe'],
-    });
-    let stdout = '';
-    let stderr = '';
-    child.stdout.on('data', (chunk) => { stdout += chunk; });
-    child.stderr.on('data', (chunk) => { stderr += chunk; });
-    child.once('error', reject);
-    child.once('close', (code) => resolve({ code, stdout, stderr }));
-    child.stdin.end(input);
-  });
-}
-
-function runHook(handler, input, environment = {}) {
-  const executable = process.platform === 'win32' ? 'powershell.exe' : '/bin/sh';
-  const args = process.platform === 'win32'
-    ? ['-NoProfile', '-NonInteractive', '-Command', handler.command]
-    : ['-c', handler.command];
-  return new Promise((resolve, reject) => {
-    const child = spawn(executable, args, {
-      env: { ...process.env, ...environment },
-      stdio: ['pipe', 'pipe', 'pipe'],
-    });
-    let stdout = '';
-    let stderr = '';
-    child.stdout.on('data', (chunk) => { stdout += chunk; });
-    child.stderr.on('data', (chunk) => { stderr += chunk; });
-    child.once('error', reject);
-    child.once('close', (code) => resolve({ code, stdout, stderr }));
-    child.stdin.end(input);
-  });
-}
-
-async function writeJson(filePath, value) {
-  await mkdir(path.dirname(filePath), { recursive: true });
-  await writeFile(filePath, typeof value === 'string' ? value : `${JSON.stringify(value, null, 2)}\n`);
-}
-
-async function runPlugin(fixture, method, argument) {
-  const source = `
-    import { cursorPlugin } from ${JSON.stringify(pluginModuleUrl)};
-    const argument = JSON.parse(process.env.ELYDORA_TEST_ARGUMENT);
-    const result = await cursorPlugin[process.env.ELYDORA_TEST_METHOD](argument);
-    if (result !== undefined) console.log(JSON.stringify(result));
-  `;
-  return runNode(
-    ['--input-type=module', '--eval', source],
-    {
-      HOME: fixture.homeDir,
-      USERPROFILE: fixture.homeDir,
-      ELYDORA_TEST_ARGUMENT: JSON.stringify(argument),
-      ELYDORA_TEST_METHOD: method,
-    },
-    fixture.projectDir,
-  );
-}
-
-async function createFixture({ existingConfig, createRuntimes = true, hookSource } = {}) {
-  const rootDir = await mkdtemp(path.join(os.tmpdir(), 'elydora-cursor-'));
-  const homeDir = path.join(rootDir, "home with spaces and 'quote");
-  const projectDir = path.join(rootDir, 'project with spaces');
-  const configPath = path.join(homeDir, '.cursor', 'hooks.json');
-  const agentDir = path.join(homeDir, '.elydora', 'agent-1');
-  const guardScriptPath = path.join(agentDir, 'guard.js');
-  const hookScriptPath = path.join(agentDir, 'hook.js');
-  await mkdir(projectDir, { recursive: true });
-  if (createRuntimes) {
-    await mkdir(agentDir, { recursive: true });
-    await writeFile(
-      guardScriptPath,
-      "process.stdin.resume(); process.stdin.once('end', () => { process.stderr.write('Agent is frozen by Elydora.'); process.exit(2); });\n",
-    );
-    await writeFile(hookScriptPath, hookSource ?? 'process.stdin.resume();\n');
-    await writeFile(path.join(agentDir, 'config.json'), JSON.stringify({
-      agent_id: 'agent-1',
-      agent_name: 'cursor',
-    }));
-  }
-  if (existingConfig !== undefined) await writeJson(configPath, existingConfig);
-  return {
-    agentDir,
-    configPath,
-    guardScriptPath,
-    homeDir,
-    hookScriptPath,
-    projectDir,
-    rootDir,
-    async install() {
-      return runPlugin(this, 'install', {
-        agentName: 'cursor',
-        agentId: 'agent-1',
-        guardScriptPath,
-        hookScriptPath,
-      });
-    },
-    async close() {
-      await rm(rootDir, { recursive: true, force: true });
-    },
-  };
-}
-
-function managedHandler(config, event, scriptName) {
-  return config.hooks?.[event]?.find((handler) => handler.command?.includes(scriptName));
-}
-
-function assertNativeHandler(handler) {
-  assert.deepEqual(Object.keys(handler).sort(), ['command', 'failClosed', 'timeout']);
-  assert.equal(handler.failClosed, true);
-  assert.equal(handler.timeout, 10);
-  assert.match(handler.command, /node(?:\.exe)?/i);
-  if (process.platform === 'win32') {
-    assert.match(handler.command, /^& /);
-    assert.match(handler.command, /; exit \$LASTEXITCODE$/);
-  } else {
-    assert.match(handler.command, /^'/);
-  }
-}
-
-function legacyHandler(scriptPath) {
-  return { command: `node "${scriptPath}"` };
-}
+import {
+  assertNativeHandler,
+  createFixture,
+  installConfig,
+  legacyHandler,
+  managedHandler,
+  registryModuleUrl,
+  runPlugin,
+  writeJson,
+} from '../test-support/cursor-test-helpers.mjs';
 
 test('Cursor is registered with the native user hook file', async () => {
   const { SUPPORTED_AGENTS } = await import(registryModuleUrl);
@@ -155,11 +31,10 @@ test('Cursor is registered with the native user hook file', async () => {
   });
 });
 
-test('Cursor install preserves user hooks, migrates legacy entries, and is idempotent', async () => {
+test('Cursor install preserves hooks, migrates legacy entries, and is idempotent', async () => {
   const fixture = await createFixture();
   try {
     await writeJson(fixture.configPath, {
-      version: 1,
       description: 'user-owned',
       hooks: {
         sessionStart: [{ command: 'user-session' }],
@@ -168,9 +43,11 @@ test('Cursor install preserves user hooks, migrates legacy entries, and is idemp
           legacyHandler(fixture.guardScriptPath),
         ],
         postToolUse: [legacyHandler(fixture.hookScriptPath)],
+        postToolUseFailure: [legacyHandler(fixture.hookScriptPath)],
       },
     });
-    assert.equal((await fixture.install()).code, 0);
+    const first = await fixture.install();
+    assert.equal(first.code, 0, first.stderr);
     const second = await fixture.install();
     assert.equal(second.code, 0, second.stderr);
 
@@ -181,63 +58,16 @@ test('Cursor install preserves user hooks, migrates legacy entries, and is idemp
     assert.deepEqual(config.hooks.preToolUse[0], { command: 'user-pre' });
     assert.equal(config.hooks.preToolUse.length, 2);
     assert.equal(config.hooks.postToolUse.length, 1);
+    assert.equal(config.hooks.postToolUseFailure.length, 1);
     assertNativeHandler(managedHandler(config, 'preToolUse', 'guard.js'));
     assertNativeHandler(managedHandler(config, 'postToolUse', 'hook.js'));
+    assertNativeHandler(managedHandler(config, 'postToolUseFailure', 'hook.js'));
   } finally {
     await fixture.close();
   }
 });
 
-test('Cursor hooks block freezes and forward official input byte-for-byte', async () => {
-  const capturePath = path.join(os.tmpdir(), `elydora-cursor-event-${process.pid}-${Date.now()}.json`);
-  const fixture = await createFixture({
-    hookSource: `
-      const fs = require('node:fs');
-      const chunks = [];
-      process.stdin.on('data', (chunk) => chunks.push(chunk));
-      process.stdin.on('end', () => fs.writeFileSync(process.env.ELYDORA_CAPTURE, Buffer.concat(chunks)));
-    `,
-  });
-  try {
-    const install = await fixture.install();
-    assert.equal(install.code, 0, install.stderr);
-    const config = JSON.parse(await readFile(fixture.configPath, 'utf-8'));
-    const guard = managedHandler(config, 'preToolUse', 'guard.js');
-    const audit = managedHandler(config, 'postToolUse', 'hook.js');
-    const prePayload = `${JSON.stringify({
-      conversation_id: 'conversation-1',
-      generation_id: 'generation-1',
-      hook_event_name: 'preToolUse',
-      tool_name: 'Shell',
-      tool_input: { command: 'Get-ChildItem', working_directory: fixture.projectDir },
-      tool_use_id: 'call-1',
-      cwd: fixture.projectDir,
-    })}\n`;
-    const guardResult = await runHook(guard, prePayload);
-    assert.equal(guardResult.code, 2, guardResult.stderr);
-    assert.match(guardResult.stderr, /Agent is frozen by Elydora/);
-
-    const postPayload = `${JSON.stringify({
-      conversation_id: 'conversation-1',
-      generation_id: 'generation-1',
-      hook_event_name: 'postToolUse',
-      tool_name: 'Shell',
-      tool_input: { command: 'Get-ChildItem' },
-      tool_output: '{"exitCode":0,"stdout":"ok"}',
-      tool_use_id: 'call-1',
-      cwd: fixture.projectDir,
-      duration: 42,
-    })}\n`;
-    const auditResult = await runHook(audit, postPayload, { ELYDORA_CAPTURE: capturePath });
-    assert.equal(auditResult.code, 0, auditResult.stderr);
-    assert.equal(await readFile(capturePath, 'utf-8'), postPayload);
-  } finally {
-    await fixture.close();
-    await rm(capturePath, { force: true });
-  }
-});
-
-test('Cursor status requires an exact pair, matching identity, and physical runtimes', async () => {
+test('Cursor status requires three handlers, matching identity, and every runtime secret', async () => {
   const fixture = await createFixture();
   try {
     assert.equal((await fixture.install()).code, 0);
@@ -245,25 +75,27 @@ test('Cursor status requires an exact pair, matching identity, and physical runt
     assert.equal(status.code, 0, status.stderr);
     assert.equal(JSON.parse(status.stdout).installed, true);
 
-    const config = JSON.parse(await readFile(fixture.configPath, 'utf-8'));
-    config.hooks.preToolUse[0].failClosed = false;
-    await writeJson(fixture.configPath, config);
+    const hooks = JSON.parse(await readFile(fixture.configPath, 'utf-8'));
+    delete hooks.hooks.postToolUseFailure;
+    await writeJson(fixture.configPath, hooks);
     status = await runPlugin(fixture, 'status', null);
     assert.equal(JSON.parse(status.stdout).hookConfigured, false);
 
     assert.equal((await fixture.install()).code, 0);
-    const auditSource = await readFile(fixture.hookScriptPath);
-    await rm(fixture.hookScriptPath);
-    status = await runPlugin(fixture, 'status', null);
-    assert.equal(JSON.parse(status.stdout).installed, false);
-    await writeFile(fixture.hookScriptPath, auditSource);
-
-    const runtimeConfigPath = path.join(fixture.agentDir, 'config.json');
-    await writeJson(runtimeConfigPath, { agent_id: 'another-agent', agent_name: 'cursor' });
+    const keyPath = path.join(fixture.agentDir, 'private.key');
+    await rm(keyPath);
     status = await runPlugin(fixture, 'status', null);
     assert.equal(JSON.parse(status.stdout).installed, false);
 
-    await writeFile(runtimeConfigPath, '{ malformed');
+    await writeFile(keyPath, 'restored', { mode: 0o600 });
+    await writeJson(path.join(fixture.agentDir, 'config.json'), {
+      agent_id: 'another-agent',
+      agent_name: 'cursor',
+    });
+    status = await runPlugin(fixture, 'status', null);
+    assert.equal(JSON.parse(status.stdout).installed, false);
+
+    await writeFile(path.join(fixture.agentDir, 'config.json'), '{ malformed');
     status = await runPlugin(fixture, 'status', null);
     assert.equal(status.code, 1);
     assert.match(status.stderr, /parse Elydora runtime config/i);
@@ -279,14 +111,16 @@ test('Cursor uninstall removes exact ownership and preserves user entries', asyn
   try {
     assert.equal((await fixture.install()).code, 0);
     const config = JSON.parse(await readFile(fixture.configPath, 'utf-8'));
-    const otherGuard = structuredClone(managedHandler(config, 'preToolUse', 'guard.js'));
-    const otherAudit = structuredClone(managedHandler(config, 'postToolUse', 'hook.js'));
-    otherGuard.command = otherGuard.command.replaceAll('agent-1', 'agent-10');
-    otherAudit.command = otherAudit.command.replaceAll('agent-1', 'agent-10');
-    config.hooks.preToolUse.push(otherGuard, {
-      command: 'echo elydora agent-1 guard.js', timeout: 10, failClosed: true,
-    });
-    config.hooks.postToolUse.push(otherAudit);
+    for (const [event, script] of [
+      ['preToolUse', 'guard.js'],
+      ['postToolUse', 'hook.js'],
+      ['postToolUseFailure', 'hook.js'],
+    ]) {
+      const other = structuredClone(managedHandler(config, event, script));
+      other.command = other.command.replaceAll('agent-1', 'agent-10');
+      config.hooks[event].push(other);
+    }
+    config.hooks.preToolUse.push({ command: 'user-pre' });
     await writeJson(fixture.configPath, config);
 
     const result = await runPlugin(fixture, 'uninstall', 'agent-1');
@@ -295,17 +129,19 @@ test('Cursor uninstall removes exact ownership and preserves user entries', asyn
     assert.deepEqual(remaining.hooks.sessionStart, [{ command: 'keep' }]);
     assert.equal(remaining.hooks.preToolUse.length, 2);
     assert.equal(remaining.hooks.postToolUse.length, 1);
+    assert.equal(remaining.hooks.postToolUseFailure.length, 1);
     assert.match(remaining.hooks.preToolUse[0].command, /agent-10/);
   } finally {
     await fixture.close();
   }
 });
 
-test('Cursor rejects malformed, duplicate, and invalid configs before writes', async () => {
+test('Cursor rejects malformed, duplicate, versionless user, and invalid configs before writes', async () => {
   const invalidConfigs = [
     '{ malformed',
     '[]\n',
     '{"hooks":{}}\n',
+    '{"hooks":{"preToolUse":[{"command":"user"}]}}\n',
     '{"version":2,"hooks":{}}\n',
     '{"version":1,"hooks":null}\n',
     '{"version":1,"hooks":{"preToolUse":null}}\n',
@@ -320,54 +156,20 @@ test('Cursor rejects malformed, duplicate, and invalid configs before writes', a
       const result = await fixture.install();
       assert.equal(result.code, 1, `accepted ${existingConfig}`);
       assert.equal(await readFile(fixture.configPath, 'utf-8'), before);
+      await assert.rejects(lstat(path.join(fixture.homeDir, '.elydora')), { code: 'ENOENT' });
     } finally {
       await fixture.close();
     }
   }
 });
 
-test('Cursor rejects missing and symbolic-link files before config writes', async (t) => {
-  const missing = await createFixture({ createRuntimes: false });
-  try {
-    const result = await missing.install();
-    assert.equal(result.code, 1);
-    assert.match(result.stderr, /runtime is missing/i);
-    await assert.rejects(readFile(missing.configPath), { code: 'ENOENT' });
-  } finally {
-    await missing.close();
-  }
-
-  const linkedRuntime = await createFixture();
-  try {
-    const target = path.join(linkedRuntime.homeDir, 'guard-target.js');
-    await writeFile(target, 'process.exit(2);\n');
-    await rm(linkedRuntime.guardScriptPath);
-    try {
-      await symlink(target, linkedRuntime.guardScriptPath);
-    } catch (error) {
-      if (error?.code === 'EPERM') t.skip(`symbolic links unavailable: ${error.message}`);
-      throw error;
-    }
-    const result = await linkedRuntime.install();
-    assert.equal(result.code, 1);
-    assert.match(result.stderr, /physical file/i);
-    await assert.rejects(readFile(linkedRuntime.configPath), { code: 'ENOENT' });
-  } finally {
-    await linkedRuntime.close();
-  }
-});
-
-test('Cursor confines both runtimes to the managed agent directory', async () => {
+test('Cursor confines runtime scripts to the managed agent directory', async () => {
   for (const field of ['guardScriptPath', 'hookScriptPath']) {
     const fixture = await createFixture();
     try {
-      const result = await runPlugin(fixture, 'install', {
-        agentName: 'cursor',
-        agentId: 'agent-1',
-        guardScriptPath: fixture.guardScriptPath,
-        hookScriptPath: fixture.hookScriptPath,
+      const result = await runPlugin(fixture, 'install', installConfig(fixture, {
         [field]: path.join(fixture.homeDir, `unmanaged-${field}.js`),
-      });
+      }));
       assert.equal(result.code, 1);
       assert.match(result.stderr, /managed agent directory/i);
       await assert.rejects(readFile(fixture.configPath), { code: 'ENOENT' });
@@ -377,17 +179,21 @@ test('Cursor confines both runtimes to the managed agent directory', async () =>
   }
 });
 
-test('Cursor rejects symbolic-link config and preserves its target', async (t) => {
+test('Cursor rejects a symbolic-link config and preserves its target', async (t) => {
   const fixture = await createFixture();
   try {
     const target = path.join(fixture.homeDir, 'cursor-hooks-target.json');
     const original = '{"version":1,"hooks":{}}\n';
+    await mkdir(fixture.homeDir, { recursive: true });
     await writeFile(target, original);
     await mkdir(path.dirname(fixture.configPath), { recursive: true });
     try {
       await symlink(target, fixture.configPath);
     } catch (error) {
-      if (error?.code === 'EPERM') t.skip(`symbolic links unavailable: ${error.message}`);
+      if (error?.code === 'EPERM') {
+        t.skip(`symbolic links unavailable: ${error.message}`);
+        return;
+      }
       throw error;
     }
     const result = await fixture.install();
@@ -401,12 +207,13 @@ test('Cursor rejects symbolic-link config and preserves its target', async (t) =
 });
 
 test('Cursor status rejects symbolic-link runtime files', async (t) => {
-  for (const name of ['config', 'guard', 'audit']) {
+  for (const name of ['config', 'key', 'guard', 'audit']) {
     const fixture = await createFixture();
     try {
       assert.equal((await fixture.install()).code, 0);
       const filePath = {
         config: path.join(fixture.agentDir, 'config.json'),
+        key: path.join(fixture.agentDir, 'private.key'),
         guard: fixture.guardScriptPath,
         audit: fixture.hookScriptPath,
       }[name];
@@ -417,7 +224,10 @@ test('Cursor status rejects symbolic-link runtime files', async (t) => {
       try {
         await symlink(target, filePath);
       } catch (error) {
-        if (error?.code === 'EPERM') t.skip(`symbolic links unavailable: ${error.message}`);
+        if (error?.code === 'EPERM') {
+          t.skip(`symbolic links unavailable: ${error.message}`);
+          return;
+        }
         throw error;
       }
       const status = await runPlugin(fixture, 'status', null);
@@ -429,7 +239,7 @@ test('Cursor status rejects symbolic-link runtime files', async (t) => {
   }
 });
 
-test('Cursor removes an entirely managed config and leaves absent config absent', async () => {
+test('Cursor removes an entirely managed config and leaves an absent config absent', async () => {
   const fixture = await createFixture();
   try {
     assert.equal((await fixture.install()).code, 0);
@@ -443,48 +253,29 @@ test('Cursor removes an entirely managed config and leaves absent config absent'
   }
 });
 
-test('Cursor atomic writes are private and leave no staging files', async () => {
+test('Cursor installation writes private files and leaves no transaction files', async () => {
   const fixture = await createFixture();
   try {
-    assert.equal((await fixture.install()).code, 0);
-    const files = await readdir(path.dirname(fixture.configPath));
-    assert.equal(files.some((name) => name.endsWith('.tmp') || name.endsWith('.rollback')), false);
+    const result = await fixture.install();
+    assert.equal(result.code, 0, result.stderr);
+    const names = [
+      ...await readdir(fixture.agentDir),
+      ...await readdir(path.dirname(fixture.configPath)),
+    ];
+    assert.equal(names.some((name) => /\.(tmp|rollback)$/.test(name)), false);
     if (process.platform !== 'win32') {
-      assert.equal((await stat(fixture.configPath)).mode & 0o777, 0o600);
+      for (const filePath of [
+        fixture.configPath,
+        path.join(fixture.agentDir, 'config.json'),
+        path.join(fixture.agentDir, 'private.key'),
+      ]) {
+        assert.equal((await stat(filePath)).mode & 0o777, 0o600);
+      }
+      for (const filePath of [fixture.guardScriptPath, fixture.hookScriptPath]) {
+        assert.equal((await stat(filePath)).mode & 0o777, 0o700);
+      }
     }
   } finally {
     await fixture.close();
   }
 });
-
-test('Cursor atomic write detects a concurrent source change', async () => {
-  const fixture = await createFixture({
-    existingConfig: { version: 1, hooks: { sessionStart: [{ command: 'original' }] } },
-  });
-  const concurrent = '{"version":1,"hooks":{"sessionStart":[{"command":"concurrent"}]}}\n';
-  try {
-    const source = `
-      import { writeFile } from 'node:fs/promises';
-      import { readDocument, writeDocument } from ${JSON.stringify(ioModuleUrl)};
-      const document = await readDocument();
-      await writeFile(document.filePath, process.env.ELYDORA_CONCURRENT, 'utf-8');
-      await writeDocument({
-        document,
-        changed: true,
-        next: '{"version":1,"hooks":{}}\\n',
-      });
-    `;
-    const result = await runNode(
-      ['--input-type=module', '--eval', source],
-      { HOME: fixture.homeDir, USERPROFILE: fixture.homeDir, ELYDORA_CONCURRENT: concurrent },
-      fixture.projectDir,
-    );
-    assert.equal(result.code, 1);
-    assert.match(result.stderr, /changed during update/i);
-    assert.equal(await readFile(fixture.configPath, 'utf-8'), concurrent);
-    const files = await readdir(path.dirname(fixture.configPath));
-    assert.equal(files.some((name) => name.endsWith('.tmp')), false);
-  } finally {
-    await fixture.close();
-  }
-});

test/cursor-runtime.test.mjs

@@ -0,0 +1,176 @@
+import assert from 'node:assert/strict';
+import { readFile, writeFile } from 'node:fs/promises';
+import path from 'node:path';
+import test from 'node:test';
+import {
+  createFixture,
+  managedHandler,
+  runHook,
+  startApiServer,
+  writeJson,
+} from '../test-support/cursor-test-helpers.mjs';
+
+test('Cursor guard and both audit events use native JSON contracts', async () => {
+  const api = await startApiServer();
+  const fixture = await createFixture({ baseUrl: api.baseUrl });
+  try {
+    const install = await fixture.install();
+    assert.equal(install.code, 0, install.stderr);
+    const config = JSON.parse(await readFile(fixture.configPath, 'utf-8'));
+    const guard = managedHandler(config, 'preToolUse', 'guard.js');
+    const successAudit = managedHandler(config, 'postToolUse', 'hook.js');
+    const failureAudit = managedHandler(config, 'postToolUseFailure', 'hook.js');
+
+    const prePayload = {
+      conversation_id: 'conversation-1',
+      generation_id: 'generation-1',
+      hook_event_name: 'preToolUse',
+      tool_name: 'Shell',
+      tool_input: { command: 'Get-ChildItem', working_directory: fixture.projectDir },
+      tool_use_id: 'call-1',
+      cwd: fixture.projectDir,
+    };
+    const guardResult = await runHook(guard, `${JSON.stringify(prePayload)}\n`, fixture);
+    assert.equal(guardResult.code, 0, guardResult.stderr);
+    assert.deepEqual(JSON.parse(guardResult.stdout), { permission: 'allow' });
+
+    const postPayload = {
+      conversation_id: 'conversation-1',
+      generation_id: 'generation-1',
+      hook_event_name: 'postToolUse',
+      tool_name: 'Shell',
+      tool_input: { command: 'Get-ChildItem' },
+      tool_output: '{"exitCode":0,"stdout":"ok"}',
+      tool_use_id: 'call-1',
+      cwd: fixture.projectDir,
+      duration: 42,
+    };
+    const postResult = await runHook(successAudit, `${JSON.stringify(postPayload)}\n`, fixture);
+    assert.equal(postResult.code, 0, postResult.stderr);
+    assert.deepEqual(JSON.parse(postResult.stdout), {});
+
+    const failurePayload = {
+      conversation_id: 'conversation-1',
+      generation_id: 'generation-1',
+      hook_event_name: 'postToolUseFailure',
+      tool_name: 'Shell',
+      tool_input: { command: 'exit 7' },
+      tool_error: { message: 'Process exited with code 7', exit_code: 7 },
+      tool_use_id: 'call-2',
+      cwd: fixture.projectDir,
+      duration: 12,
+    };
+    const failureResult = await runHook(
+      failureAudit,
+      `${JSON.stringify(failurePayload)}\n`,
+      fixture,
+    );
+    assert.equal(failureResult.code, 0, failureResult.stderr);
+    assert.deepEqual(JSON.parse(failureResult.stdout), {});
+
+    const operations = api.requests
+      .filter((request) => request.method === 'POST')
+      .map((request) => JSON.parse(request.raw));
+    assert.equal(operations.length, 2);
+    assert.deepEqual(operations[0].payload, postPayload);
+    assert.deepEqual(operations[1].payload, failurePayload);
+    assert.equal(operations[0].subject.session_id, 'conversation-1');
+    assert.equal(operations[1].action.tool, 'Shell');
+  } finally {
+    await fixture.close();
+    await api.close();
+  }
+});
+
+test('Cursor guard emits a structured deny for frozen and revoked agents', async () => {
+  const fixture = await createFixture();
+  try {
+    assert.equal((await fixture.install()).code, 0);
+    const config = JSON.parse(await readFile(fixture.configPath, 'utf-8'));
+    const guard = managedHandler(config, 'preToolUse', 'guard.js');
+    for (const status of ['frozen', 'revoked']) {
+      await writeJson(path.join(fixture.agentDir, 'status-cache.json'), {
+        status,
+        cached_at: Date.now(),
+      });
+      const result = await runHook(guard, '{}\n', fixture);
+      assert.equal(result.code, 2, result.stderr);
+      const response = JSON.parse(result.stdout);
+      assert.equal(response.permission, 'deny');
+      assert.match(response.agentMessage, new RegExp(status));
+    }
+  } finally {
+    await fixture.close();
+  }
+});
+
+test('Cursor strict runtimes surface malformed input, config, key, cache, and API errors', async () => {
+  const api = await startApiServer({ operationStatus: 500 });
+  const fixture = await createFixture({ baseUrl: api.baseUrl });
+  try {
+    assert.equal((await fixture.install()).code, 0);
+    const hooks = JSON.parse(await readFile(fixture.configPath, 'utf-8'));
+    const guard = managedHandler(hooks, 'preToolUse', 'guard.js');
+    const audit = managedHandler(hooks, 'postToolUse', 'hook.js');
+    const runtimeConfigPath = path.join(fixture.agentDir, 'config.json');
+    const runtimeConfig = await readFile(runtimeConfigPath, 'utf-8');
+    const privateKeyPath = path.join(fixture.agentDir, 'private.key');
+    const privateKey = await readFile(privateKeyPath, 'utf-8');
+
+    let result = await runHook(audit, '{ malformed', fixture);
+    assert.equal(result.code, 1);
+    assert.equal(result.stdout, '');
+    assert.match(result.stderr, /invalid JSON/i);
+
+    await writeFile(runtimeConfigPath, '{ malformed', { mode: 0o600 });
+    result = await runHook(guard, '{}\n', fixture);
+    assert.equal(result.code, 1);
+    assert.match(result.stderr, /agent config/i);
+    await writeFile(runtimeConfigPath, runtimeConfig, { mode: 0o600 });
+
+    await writeFile(privateKeyPath, 'invalid-key', { mode: 0o600 });
+    result = await runHook(audit, '{}\n', fixture);
+    assert.equal(result.code, 1);
+    assert.match(result.stderr, /private key/i);
+    await writeFile(privateKeyPath, privateKey, { mode: 0o600 });
+
+    await writeFile(path.join(fixture.agentDir, 'status-cache.json'), '{ malformed', {
+      mode: 0o600,
+    });
+    result = await runHook(guard, '{}\n', fixture);
+    assert.equal(result.code, 1);
+    assert.match(result.stderr, /status cache/i);
+
+    await writeFile(path.join(fixture.agentDir, 'status-cache.json'), JSON.stringify({
+      status: 'active',
+      cached_at: 0,
+    }), { mode: 0o600 });
+    result = await runHook(audit, '{}\n', fixture);
+    assert.equal(result.code, 1);
+    assert.match(result.stderr, /HTTP 500/i);
+    assert.match(await readFile(path.join(fixture.agentDir, 'error.log'), 'utf-8'), /HTTP 500/i);
+  } finally {
+    await fixture.close();
+    await api.close();
+  }
+});
+
+test('Cursor guard fails closed on invalid status API data', async () => {
+  const api = await startApiServer({ status: 'paused' });
+  const fixture = await createFixture({ baseUrl: api.baseUrl });
+  try {
+    assert.equal((await fixture.install()).code, 0);
+    const hooks = JSON.parse(await readFile(fixture.configPath, 'utf-8'));
+    const result = await runHook(
+      managedHandler(hooks, 'preToolUse', 'guard.js'),
+      '{}\n',
+      fixture,
+    );
+    assert.equal(result.code, 1);
+    assert.equal(result.stdout, '');
+    assert.match(result.stderr, /invalid agent status/i);
+  } finally {
+    await fixture.close();
+    await api.close();
+  }
+});

test/cursor-transaction.test.mjs

@@ -0,0 +1,262 @@
+import assert from 'node:assert/strict';
+import {
+  lstat,
+  mkdir,
+  readFile,
+  readdir,
+  symlink,
+  writeFile,
+} from 'node:fs/promises';
+import path from 'node:path';
+import test from 'node:test';
+import {
+  VALID_PRIVATE_KEY,
+  createFixture,
+  installationModuleUrl,
+  installConfig,
+  ioModuleUrl,
+  runNode,
+  writeJson,
+} from '../test-support/cursor-test-helpers.mjs';
+
+const managedFileNames = ['guard.js', 'config.json', 'private.key', 'hook.js'];
+
+async function snapshotInstallation(fixture) {
+  const entries = await Promise.all(managedFileNames.map(async (name) => [
+    path.join(fixture.agentDir, name),
+    await readFile(path.join(fixture.agentDir, name), 'utf-8'),
+  ]));
+  entries.push([fixture.configPath, await readFile(fixture.configPath, 'utf-8')]);
+  return new Map(entries);
+}
+
+async function assertSnapshot(snapshot) {
+  for (const [filePath, expected] of snapshot) {
+    assert.equal(await readFile(filePath, 'utf-8'), expected, filePath);
+  }
+}
+
+async function assertNoTransactionFiles(fixture) {
+  const names = [
+    ...await readdir(fixture.agentDir),
+    ...await readdir(path.dirname(fixture.configPath)),
+  ];
+  assert.equal(names.some((name) => /\.(tmp|rollback)$/.test(name)), false);
+}
+
+test('Cursor rolls back all five files when a transaction commit fails', async () => {
+  const fixture = await createFixture();
+  try {
+    assert.equal((await fixture.install()).code, 0);
+    const before = await snapshotInstallation(fixture);
+    const source = `
+      import { rename } from 'node:fs/promises';
+      import { readDocument } from ${JSON.stringify(ioModuleUrl)};
+      import {
+        commitCursorInstallation,
+        prepareCursorInstallation,
+      } from ${JSON.stringify(installationModuleUrl)};
+      const config = JSON.parse(process.env.ELYDORA_INSTALL_CONFIG);
+      const document = await readDocument();
+      const prepared = await prepareCursorInstallation(config, { document, changed: false });
+      let calls = 0;
+      await commitCursorInstallation(prepared, async (from, to) => {
+        calls += 1;
+        if (calls === 3) throw new Error('injected rename failure');
+        await rename(from, to);
+      });
+    `;
+    const result = await runNode(
+      ['--input-type=module', '--eval', source],
+      {
+        HOME: fixture.homeDir,
+        USERPROFILE: fixture.homeDir,
+        ELYDORA_INSTALL_CONFIG: JSON.stringify(installConfig(fixture, {
+          orgId: 'org-updated',
+          token: 'token-updated',
+        })),
+      },
+      fixture.projectDir,
+    );
+    assert.equal(result.code, 1);
+    assert.match(result.stderr, /injected rename failure/i);
+    await assertSnapshot(before);
+    await assertNoTransactionFiles(fixture);
+  } finally {
+    await fixture.close();
+  }
+});
+
+test('Cursor detects concurrent hook config changes before committing runtime updates', async () => {
+  const fixture = await createFixture({
+    existingConfig: { version: 1, hooks: { sessionStart: [{ command: 'original' }] } },
+  });
+  try {
+    assert.equal((await fixture.install()).code, 0);
+    const before = await snapshotInstallation(fixture);
+    const concurrent = '{"version":1,"hooks":{"sessionStart":[{"command":"concurrent"}]}}\n';
+    const source = `
+      import { writeFile } from 'node:fs/promises';
+      import { readDocument } from ${JSON.stringify(ioModuleUrl)};
+      import {
+        commitCursorInstallation,
+        prepareCursorInstallation,
+      } from ${JSON.stringify(installationModuleUrl)};
+      const config = JSON.parse(process.env.ELYDORA_INSTALL_CONFIG);
+      const document = await readDocument();
+      const prepared = await prepareCursorInstallation(config, { document, changed: false });
+      await writeFile(document.filePath, process.env.ELYDORA_CONCURRENT, 'utf-8');
+      await commitCursorInstallation(prepared);
+    `;
+    const result = await runNode(
+      ['--input-type=module', '--eval', source],
+      {
+        HOME: fixture.homeDir,
+        USERPROFILE: fixture.homeDir,
+        ELYDORA_CONCURRENT: concurrent,
+        ELYDORA_INSTALL_CONFIG: JSON.stringify(installConfig(fixture, { orgId: 'org-updated' })),
+      },
+      fixture.projectDir,
+    );
+    assert.equal(result.code, 1);
+    assert.match(result.stderr, /changed during Cursor installation/i);
+    for (const [filePath, expected] of before) {
+      if (filePath !== fixture.configPath) assert.equal(await readFile(filePath, 'utf-8'), expected);
+    }
+    assert.equal(await readFile(fixture.configPath, 'utf-8'), concurrent);
+    await assertNoTransactionFiles(fixture);
+  } finally {
+    await fixture.close();
+  }
+});
+
+test('Cursor rejects a stale hook document before staging an installation', async () => {
+  const fixture = await createFixture();
+  try {
+    assert.equal((await fixture.install()).code, 0);
+    const before = await snapshotInstallation(fixture);
+    const concurrent = '{"version":1,"hooks":{"sessionStart":[{"command":"new"}]}}\n';
+    const source = `
+      import { writeFile } from 'node:fs/promises';
+      import { readDocument } from ${JSON.stringify(ioModuleUrl)};
+      import { prepareCursorInstallation } from ${JSON.stringify(installationModuleUrl)};
+      const document = await readDocument();
+      await writeFile(document.filePath, process.env.ELYDORA_CONCURRENT, 'utf-8');
+      await prepareCursorInstallation(
+        JSON.parse(process.env.ELYDORA_INSTALL_CONFIG),
+        { document, changed: false },
+      );
+    `;
+    const result = await runNode(
+      ['--input-type=module', '--eval', source],
+      {
+        HOME: fixture.homeDir,
+        USERPROFILE: fixture.homeDir,
+        ELYDORA_CONCURRENT: concurrent,
+        ELYDORA_INSTALL_CONFIG: JSON.stringify(installConfig(fixture)),
+      },
+      fixture.projectDir,
+    );
+    assert.equal(result.code, 1);
+    assert.match(result.stderr, /changed before installation/i);
+    for (const [filePath, expected] of before) {
+      if (filePath !== fixture.configPath) assert.equal(await readFile(filePath, 'utf-8'), expected);
+    }
+    assert.equal(await readFile(fixture.configPath, 'utf-8'), concurrent);
+    await assertNoTransactionFiles(fixture);
+  } finally {
+    await fixture.close();
+  }
+});
+
+test('Cursor rejects orphaned runtime artifacts before writing hook config', async () => {
+  const fixture = await createFixture();
+  try {
+    await mkdir(fixture.agentDir, { recursive: true });
+    await writeFile(fixture.guardScriptPath, 'orphaned guard\n');
+    const result = await fixture.install();
+    assert.equal(result.code, 1);
+    assert.match(result.stderr, /identity cannot be verified/i);
+    assert.equal(await readFile(fixture.guardScriptPath, 'utf-8'), 'orphaned guard\n');
+    await assert.rejects(readFile(fixture.configPath), { code: 'ENOENT' });
+  } finally {
+    await fixture.close();
+  }
+});
+
+test('Cursor rejects a mismatched runtime identity before changing files', async () => {
+  const fixture = await createFixture();
+  try {
+    await writeJson(path.join(fixture.agentDir, 'config.json'), {
+      agent_name: 'cursor',
+      agent_id: 'another-agent',
+    });
+    const before = await readFile(path.join(fixture.agentDir, 'config.json'), 'utf-8');
+    const result = await fixture.install();
+    assert.equal(result.code, 1);
+    assert.match(result.stderr, /identity does not match/i);
+    assert.equal(await readFile(path.join(fixture.agentDir, 'config.json'), 'utf-8'), before);
+    await assert.rejects(readFile(fixture.configPath), { code: 'ENOENT' });
+  } finally {
+    await fixture.close();
+  }
+});
+
+test('Cursor rejects symbolic-link config and runtime directories before file writes', async (t) => {
+  for (const kind of ['cursor', 'runtime']) {
+    const fixture = await createFixture();
+    try {
+      const target = path.join(fixture.rootDir, `${kind}-target`);
+      await mkdir(target, { recursive: true });
+      const link = kind === 'cursor'
+        ? path.join(fixture.homeDir, '.cursor')
+        : path.join(fixture.homeDir, '.elydora');
+      await mkdir(fixture.homeDir, { recursive: true });
+      try {
+        await symlink(target, link, 'junction');
+      } catch (error) {
+        if (error?.code === 'EPERM') {
+          t.skip(`symbolic links unavailable: ${error.message}`);
+          return;
+        }
+        throw error;
+      }
+      const result = await fixture.install();
+      assert.equal(result.code, 1);
+      assert.match(result.stderr, /physical directory/i);
+      assert.deepEqual(await readdir(target), []);
+      const untouched = kind === 'cursor'
+        ? path.join(fixture.homeDir, '.elydora')
+        : path.join(fixture.homeDir, '.cursor', 'hooks.json');
+      await assert.rejects(lstat(untouched), { code: 'ENOENT' });
+    } finally {
+      await fixture.close();
+    }
+  }
+});
+
+test('Cursor CLI preflight rejects malformed hooks before creating runtime files', async () => {
+  const fixture = await createFixture({ existingConfig: '{ malformed' });
+  try {
+    const privateKeyPath = path.join(fixture.rootDir, 'private.key');
+    await writeFile(privateKeyPath, VALID_PRIVATE_KEY, { mode: 0o600 });
+    const result = await runNode([
+      path.resolve('dist/cli.js'),
+      'install',
+      '--agent', 'cursor',
+      '--org_id', 'org-1',
+      '--agent_id', 'agent-1',
+      '--private_key_file', privateKeyPath,
+      '--kid', 'kid-1',
+      '--base_url', fixture.baseUrl,
+    ], {
+      HOME: fixture.homeDir,
+      USERPROFILE: fixture.homeDir,
+    }, fixture.projectDir);
+    assert.equal(result.code, 1);
+    assert.match(result.stderr, /Cursor user hooks/i);
+    await assert.rejects(lstat(path.join(fixture.homeDir, '.elydora')), { code: 'ENOENT' });
+  } finally {
+    await fixture.close();
+  }
+});