diff --git a/AGENTS.md b/AGENTS.md
index e5fd69c..0d21421 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -23,6 +23,7 @@ This repository owns the published `@elydora/sdk` package, its `elydora` CLI, lo
 - Report installation as healthy only when a complete hook contract references both generated runtime scripts and both scripts exist.
 - Model stable, legacy, and early-access hook generations as explicit contracts. Keep their activation requirements visible in CLI output and README guidance.
 - Keep Grok Build writes inside its native global `$GROK_HOME/hooks/*.json` contract. Treat Claude Code and Cursor compatibility files plus project `.grok/hooks` as read-only integration sources.
+- Write Auggie hooks only to `~/.augment/settings.json`; keep system and workspace settings read-only. Generate `.cmd` wrappers on Windows and `.sh` wrappers on Unix because Auggie dispatches supported script paths, and express hook timeouts in milliseconds.
 
 ## Code Quality
 
diff --git a/README.md b/README.md
index 6f3bcd2..42ac3a6 100644
--- a/README.md
+++ b/README.md
@@ -65,6 +65,7 @@ npx elydora install \
 
 | Agent | Key |
 |-------|-----|
+| Augment Code CLI | `augment` |
 | Claude Code | `claudecode` |
 | OpenAI Codex | `codex` |
 | Kimi Code | `kimi` |
@@ -83,6 +84,8 @@ Kimi installation writes the strict hook contract to each detected runtime: Kimi
 
 Grok Build installation writes native global hooks to `$GROK_HOME/hooks/elydora-audit.json` (default `~/.grok/hooks/elydora-audit.json`). Project hooks still follow Grok's `/hooks-trust` workflow; Elydora leaves project, Claude Code, and Cursor compatibility files unchanged.
 
+Auggie installation writes user-level hooks to `~/.augment/settings.json` and creates the `.cmd` or `.sh` wrappers required by its command runner. System and workspace settings remain unchanged. Sessions started with `--augment-cache-dir` load settings from that alternate directory.
+
 Kiro CLI installation covers both runtime contracts. Kiro CLI v2 uses the generated custom agent through `kiro-cli --agent elydora-audit`. Kiro CLI v3 loads the global standalone hooks when started with `kiro-cli --v3`.
 
 ## API Reference
diff --git a/src/cli.ts b/src/cli.ts
index ddb0a10..0e0db8f 100644
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -6,6 +6,7 @@ import { derivePublicKey } from './crypto.js';
 import { SUPPORTED_AGENTS } from './plugins/registry.js';
 import type { AgentPlugin, InstallConfig } from './plugins/base.js';
 import { generateHookScript, generateGuardScript } from './plugins/hook-template.js';
+import { augmentPlugin } from './plugins/augment.js';
 import { claudecodePlugin } from './plugins/claudecode.js';
 import { cursorPlugin } from './plugins/cursor.js';
 import { geminiPlugin } from './plugins/gemini.js';
@@ -21,6 +22,7 @@ import { grokPlugin } from './plugins/grok.js';
 const ELYDORA_DIR = path.join(os.homedir(), '.elydora');
 
 const PLUGINS: ReadonlyMap<string, AgentPlugin> = new Map([
+  ['augment', augmentPlugin],
   ['claudecode', claudecodePlugin],
   ['cursor', cursorPlugin],
   ['gemini', geminiPlugin],
diff --git a/src/plugins/augment-contract.ts b/src/plugins/augment-contract.ts
new file mode 100644
index 0000000..c8147f0
--- /dev/null
+++ b/src/plugins/augment-contract.ts
@@ -0,0 +1,316 @@
+import os from 'node:os';
+import path from 'node:path';
+
+export const AGENT_KEY = 'augment';
+export const GUARD_SCRIPT = 'guard.js';
+export const AUDIT_SCRIPT = 'hook.js';
+export const HOOK_TIMEOUT_MILLISECONDS = 10_000;
+
+const WRAPPER_EXTENSION = process.platform === 'win32' ? '.cmd' : '.sh';
+export const GUARD_WRAPPER = `augment-guard${WRAPPER_EXTENSION}`;
+export const AUDIT_WRAPPER = `augment-hook${WRAPPER_EXTENSION}`;
+
+const TOOL_EVENTS = new Set(['PreToolUse', 'PostToolUse']);
+const SESSION_EVENTS = new Set([
+  'Stop',
+  'SessionStart',
+  'SessionEnd',
+  'Notification',
+  'PromptSubmit',
+]);
+
+export type JsonObject = Record<string, unknown>;
+
+export interface AugmentHandler extends JsonObject {
+  readonly type: 'command';
+  readonly command: string;
+  readonly args?: string[];
+  readonly timeout?: number;
+}
+
+export interface AugmentGroup extends JsonObject {
+  readonly matcher?: string;
+  readonly hooks: AugmentHandler[];
+}
+
+export type AugmentHooks = Record<string, AugmentGroup[]>;
+
+export interface AugmentDocument {
+  readonly exists: boolean;
+  readonly configPath: string;
+  readonly root: JsonObject;
+  readonly hooks: AugmentHooks;
+}
+
+export interface RuntimeContract {
+  readonly agentId: string;
+  readonly guardPath: string;
+  readonly auditPath: string;
+  readonly guardWrapperPath: string;
+  readonly auditWrapperPath: string;
+}
+
+interface ParsedArgument {
+  readonly value: string;
+  readonly next: number;
+}
+
+export function isObject(value: unknown): value is JsonObject {
+  return typeof value === 'object' && value !== null && !Array.isArray(value);
+}
+
+function hasOwn(value: JsonObject, key: string): boolean {
+  return Object.prototype.hasOwnProperty.call(value, key);
+}
+
+function quotePosix(value: string): string {
+  return `'${value.replaceAll("'", `'"'"'`)}'`;
+}
+
+function quoteWindows(value: string): string {
+  return `"${value.replaceAll('"', '\\"')}"`;
+}
+
+function quoteBatch(value: string): string {
+  return `"${value.replaceAll('%', '%%')}"`;
+}
+
+function readWindowsArgument(command: string, start: number): ParsedArgument | undefined {
+  if (command[start] !== '"') return undefined;
+  let value = '';
+  for (let index = start + 1; index < command.length; index += 1) {
+    if (command[index] === '\\' && command[index + 1] === '"') {
+      value += '"';
+      index += 1;
+      continue;
+    }
+    if (command[index] === '"') return { value, next: index + 1 };
+    value += command[index];
+  }
+  return undefined;
+}
+
+const POSIX_APOSTROPHE = `'"'"'`;
+
+function readPosixArgument(command: string, start: number): ParsedArgument | undefined {
+  if (command[start] !== "'") return undefined;
+  let value = '';
+  for (let index = start + 1; index < command.length;) {
+    if (command.startsWith(POSIX_APOSTROPHE, index)) {
+      value += "'";
+      index += POSIX_APOSTROPHE.length;
+      continue;
+    }
+    if (command[index] === "'") return { value, next: index + 1 };
+    value += command[index];
+    index += 1;
+  }
+  return undefined;
+}
+
+function parseWrapperCommand(command: string): string | undefined {
+  const readArgument = process.platform === 'win32' ? readWindowsArgument : readPosixArgument;
+  const parsed = readArgument(command, 0);
+  return parsed?.next === command.length && parsed.value ? parsed.value : undefined;
+}
+
+function samePath(left: string, right: string): boolean {
+  const normalizedLeft = path.resolve(left);
+  const normalizedRight = path.resolve(right);
+  return process.platform === 'win32'
+    ? normalizedLeft.toLowerCase() === normalizedRight.toLowerCase()
+    : normalizedLeft === normalizedRight;
+}
+
+function sameAgentId(left: string, right: string): boolean {
+  return process.platform === 'win32' ? left.toLowerCase() === right.toLowerCase() : left === right;
+}
+
+export function wrapperPaths(agentId: string): {
+  readonly guardPath: string;
+  readonly auditPath: string;
+} {
+  const agentDirectory = path.join(os.homedir(), '.elydora', agentId);
+  return {
+    guardPath: path.join(agentDirectory, GUARD_WRAPPER),
+    auditPath: path.join(agentDirectory, AUDIT_WRAPPER),
+  };
+}
+
+export function buildHandler(wrapperPath: string): AugmentHandler {
+  const quote = process.platform === 'win32' ? quoteWindows : quotePosix;
+  return {
+    type: 'command',
+    command: quote(wrapperPath),
+    timeout: HOOK_TIMEOUT_MILLISECONDS,
+  };
+}
+
+export function buildWrapper(runtimePath: string): string {
+  if (process.platform === 'win32') {
+    return `@echo off\r\n${quoteBatch(process.execPath)} ${quoteBatch(runtimePath)}\r\nexit /b %errorlevel%\r\n`;
+  }
+  return `#!/bin/sh\nexec ${quotePosix(process.execPath)} ${quotePosix(runtimePath)}\n`;
+}
+
+function managedAgentId(handler: AugmentHandler, wrapperName: string): string | undefined {
+  if (handler.type !== 'command'
+    || handler.timeout !== HOOK_TIMEOUT_MILLISECONDS
+    || typeof handler.command !== 'string'
+    || hasOwn(handler, 'args')) return undefined;
+  const wrapperPath = parseWrapperCommand(handler.command);
+  if (!wrapperPath) return undefined;
+  const actualName = path.basename(wrapperPath);
+  const namesMatch = process.platform === 'win32'
+    ? actualName.toLowerCase() === wrapperName.toLowerCase()
+    : actualName === wrapperName;
+  if (!namesMatch) return undefined;
+  const agentDirectory = path.dirname(wrapperPath);
+  if (!samePath(path.dirname(agentDirectory), path.join(os.homedir(), '.elydora'))) return undefined;
+  const agentId = path.basename(agentDirectory);
+  return agentId && agentId !== '.' && agentId !== '..' ? agentId : undefined;
+}
+
+function validateHandler(
+  value: unknown,
+  event: string,
+  groupIndex: number,
+  handlerIndex: number,
+): AugmentHandler {
+  const label = `Auggie settings handler hooks.${event}[${groupIndex}].hooks[${handlerIndex}]`;
+  if (!isObject(value)) throw new Error(`${label} must be an object`);
+  if (value.type !== 'command') throw new Error(`${label} type must be "command"`);
+  if (typeof value.command !== 'string' || value.command.length === 0) {
+    throw new Error(`${label} requires a non-empty command`);
+  }
+  if (value.args !== undefined
+    && (!Array.isArray(value.args) || !value.args.every((argument) => typeof argument === 'string'))) {
+    throw new Error(`${label} args must be an array of strings`);
+  }
+  if (value.timeout !== undefined
+    && (typeof value.timeout !== 'number' || !Number.isFinite(value.timeout) || value.timeout <= 0)) {
+    throw new Error(`${label} timeout must be a positive finite number`);
+  }
+  return value as AugmentHandler;
+}
+
+function validateMetadata(value: unknown, label: string): void {
+  if (!isObject(value)) throw new Error(`${label} metadata must be an object`);
+  for (const key of ['includeConversationData', 'includeMCPMetadata', 'includeUserContext']) {
+    if (value[key] !== undefined && typeof value[key] !== 'boolean') {
+      throw new Error(`${label} metadata.${key} must be a boolean`);
+    }
+  }
+}
+
+function validateGroup(value: unknown, event: string, groupIndex: number): AugmentGroup {
+  const label = `Auggie settings group hooks.${event}[${groupIndex}]`;
+  if (!isObject(value)) throw new Error(`${label} must be an object`);
+  if (SESSION_EVENTS.has(event) && hasOwn(value, 'matcher')) {
+    throw new Error(`${label} matcher is only supported for tool events`);
+  }
+  if (value.matcher !== undefined) {
+    if (typeof value.matcher !== 'string') throw new Error(`${label} matcher must be a string`);
+    try {
+      new RegExp(value.matcher);
+    } catch (error) {
+      const message = error instanceof Error ? error.message : String(error);
+      throw new Error(`${label} matcher must be a valid regular expression: ${message}`);
+    }
+  }
+  if (value.metadata !== undefined) validateMetadata(value.metadata, label);
+  if (!Array.isArray(value.hooks)) throw new Error(`${label} must contain a hooks array`);
+  const handlers = value.hooks.map(
+    (handler, handlerIndex) => validateHandler(handler, event, groupIndex, handlerIndex),
+  );
+  return { ...value, hooks: handlers } as AugmentGroup;
+}
+
+export function readHooks(root: JsonObject): AugmentHooks {
+  if (root.hooks === undefined) return {};
+  if (!isObject(root.hooks)) throw new Error('Auggie settings field "hooks" must be an object');
+  const hooks: AugmentHooks = {};
+  for (const [event, value] of Object.entries(root.hooks)) {
+    if (!TOOL_EVENTS.has(event) && !SESSION_EVENTS.has(event)) {
+      throw new Error(`Auggie settings field "hooks.${event}" uses an unsupported event`);
+    }
+    if (!Array.isArray(value)) {
+      throw new Error(`Auggie settings field "hooks.${event}" must be an array`);
+    }
+    hooks[event] = value.map((group, index) => validateGroup(group, event, index));
+  }
+  return hooks;
+}
+
+function removeManaged(
+  groups: AugmentGroup[],
+  wrapperName: string,
+  agentId?: string,
+): { readonly groups: AugmentGroup[]; readonly changed: boolean } {
+  let changed = false;
+  const result: AugmentGroup[] = [];
+  for (const group of groups) {
+    let groupChanged = false;
+    const handlers = group.hooks.filter((handler) => {
+      const managedId = managedAgentId(handler, wrapperName);
+      const remove = managedId !== undefined
+        && (agentId === undefined || sameAgentId(managedId, agentId));
+      if (remove) {
+        changed = true;
+        groupChanged = true;
+      }
+      return !remove;
+    });
+    if (!groupChanged) result.push(group);
+    else if (handlers.length > 0) result.push({ ...group, hooks: handlers });
+  }
+  return { groups: result, changed };
+}
+
+export function removeManagedHooks(hooks: AugmentHooks, agentId?: string): {
+  readonly hooks: AugmentHooks;
+  readonly changed: boolean;
+} {
+  const next = { ...hooks };
+  let changed = false;
+  for (const [event, wrapperName] of [
+    ['PreToolUse', GUARD_WRAPPER],
+    ['PostToolUse', AUDIT_WRAPPER],
+  ] as const) {
+    const result = removeManaged(next[event] ?? [], wrapperName, agentId);
+    if (!result.changed) continue;
+    changed = true;
+    if (result.groups.length > 0) next[event] = result.groups;
+    else delete next[event];
+  }
+  return { hooks: next, changed };
+}
+
+function managedIds(groups: AugmentGroup[], wrapperName: string): Set<string> {
+  const ids = new Set<string>();
+  for (const group of groups) {
+    for (const handler of group.hooks) {
+      const agentId = managedAgentId(handler, wrapperName);
+      if (agentId) ids.add(agentId);
+    }
+  }
+  return ids;
+}
+
+export function runtimeContracts(hooks: AugmentHooks): RuntimeContract[] {
+  const guards = managedIds(hooks.PreToolUse ?? [], GUARD_WRAPPER);
+  const audits = managedIds(hooks.PostToolUse ?? [], AUDIT_WRAPPER);
+  const root = path.join(os.homedir(), '.elydora');
+  return [...guards]
+    .filter((agentId) => [...audits].some((auditId) => sameAgentId(auditId, agentId)))
+    .map((agentId) => {
+      const agentDirectory = path.join(root, agentId);
+      return {
+        agentId,
+        guardPath: path.join(agentDirectory, GUARD_SCRIPT),
+        auditPath: path.join(agentDirectory, AUDIT_SCRIPT),
+        guardWrapperPath: path.join(agentDirectory, GUARD_WRAPPER),
+        auditWrapperPath: path.join(agentDirectory, AUDIT_WRAPPER),
+      };
+    });
+}
diff --git a/src/plugins/augment-io.ts b/src/plugins/augment-io.ts
new file mode 100644
index 0000000..d1af151
--- /dev/null
+++ b/src/plugins/augment-io.ts
@@ -0,0 +1,182 @@
+import { randomUUID } from 'node:crypto';
+import fsp from 'node:fs/promises';
+import type { FileHandle } from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
+import {
+  AGENT_KEY,
+  type AugmentDocument,
+  type JsonObject,
+  type RuntimeContract,
+  isObject,
+  readHooks,
+} from './augment-contract.js';
+
+function errorMessage(error: unknown): string {
+  return error instanceof Error ? error.message : String(error);
+}
+
+function asError(error: unknown): Error {
+  return error instanceof Error ? error : new Error(String(error));
+}
+
+function hasErrorCode(error: unknown, code: string): boolean {
+  return isObject(error) && error.code === code;
+}
+
+export function resolveConfigPath(): string {
+  return path.join(os.homedir(), '.augment', 'settings.json');
+}
+
+async function readJsonObject(filePath: string, label: string): Promise<JsonObject | undefined> {
+  let raw: string;
+  try {
+    raw = await fsp.readFile(filePath, 'utf-8');
+  } catch (error) {
+    if (hasErrorCode(error, 'ENOENT')) return undefined;
+    throw new Error(`Read ${label} at ${filePath}: ${errorMessage(error)}`, {
+      cause: asError(error),
+    });
+  }
+  let value: unknown;
+  try {
+    value = JSON.parse(raw);
+  } catch (error) {
+    throw new Error(`Failed to parse ${label} at ${filePath}: ${errorMessage(error)}`, {
+      cause: asError(error),
+    });
+  }
+  if (!isObject(value)) throw new Error(`${label} at ${filePath} must contain a JSON object`);
+  return value;
+}
+
+export async function readConfig(): Promise<AugmentDocument> {
+  const configPath = resolveConfigPath();
+  const root = await readJsonObject(configPath, 'Auggie settings');
+  if (!root) return { exists: false, configPath, root: {}, hooks: {} };
+  return { exists: true, configPath, root, hooks: readHooks(root) };
+}
+
+async function failWrite(
+  handle: FileHandle | undefined,
+  tempPath: string,
+  label: string,
+  cause: unknown,
+): Promise<never> {
+  const errors = [asError(cause)];
+  if (handle) {
+    try {
+      await handle.close();
+    } catch (error) {
+      errors.push(asError(error));
+    }
+  }
+  try {
+    await fsp.unlink(tempPath);
+  } catch (error) {
+    if (!hasErrorCode(error, 'ENOENT')) errors.push(asError(error));
+  }
+  const message = `Write ${label}: ${errorMessage(cause)}`;
+  if (errors.length > 1) throw new AggregateError(errors, message);
+  throw new Error(message, { cause: errors[0] });
+}
+
+async function writeAtomic(
+  filePath: string,
+  contents: string,
+  mode: number,
+  label: string,
+): Promise<void> {
+  const directory = path.dirname(filePath);
+  await fsp.mkdir(directory, { recursive: true, mode: 0o700 });
+  const tempPath = path.join(directory, `.${path.basename(filePath)}.${randomUUID()}.tmp`);
+  let handle: FileHandle | undefined;
+  try {
+    handle = await fsp.open(tempPath, 'wx', mode);
+    await handle.writeFile(contents, 'utf-8');
+    await handle.sync();
+    await handle.close();
+    handle = undefined;
+    await fsp.rename(tempPath, filePath);
+  } catch (error) {
+    await failWrite(handle, tempPath, `${label} at ${filePath}`, error);
+  }
+}
+
+export async function writeConfig(configPath: string, root: JsonObject): Promise<void> {
+  await writeAtomic(
+    configPath,
+    JSON.stringify(root, null, 2) + '\n',
+    0o600,
+    'Auggie settings',
+  );
+}
+
+export async function writeWrapper(wrapperPath: string, contents: string): Promise<void> {
+  await writeAtomic(wrapperPath, contents, 0o700, 'Auggie hook wrapper');
+}
+
+export async function removeConfig(configPath: string): Promise<void> {
+  try {
+    await fsp.unlink(configPath);
+  } catch (error) {
+    if (hasErrorCode(error, 'ENOENT')) return;
+    throw new Error(`Remove Auggie settings at ${configPath}: ${errorMessage(error)}`, {
+      cause: asError(error),
+    });
+  }
+}
+
+export async function regularFileExists(filePath: string, label: string): Promise<boolean> {
+  try {
+    return (await fsp.stat(filePath)).isFile();
+  } catch (error) {
+    if (hasErrorCode(error, 'ENOENT') || hasErrorCode(error, 'ENOTDIR')) return false;
+    throw new Error(`Read ${label} at ${filePath}: ${errorMessage(error)}`, {
+      cause: asError(error),
+    });
+  }
+}
+
+export async function requireRuntime(filePath: string, label: string): Promise<void> {
+  if (!filePath) throw new Error(`${label} path is required`);
+  if (!await regularFileExists(filePath, label)) throw new Error(`${label} is missing: ${filePath}`);
+}
+
+function sameAgentId(left: string, right: string): boolean {
+  return process.platform === 'win32' ? left.toLowerCase() === right.toLowerCase() : left === right;
+}
+
+export async function runtimeFilesExist(contracts: RuntimeContract[]): Promise<boolean> {
+  const root = path.join(os.homedir(), '.elydora');
+  let entries: Array<{ isDirectory(): boolean; name: string }>;
+  try {
+    entries = await fsp.readdir(root, { withFileTypes: true });
+  } catch (error) {
+    if (hasErrorCode(error, 'ENOENT')) return false;
+    throw new Error(`Read Elydora runtime directory at ${root}: ${errorMessage(error)}`, {
+      cause: asError(error),
+    });
+  }
+  for (const contract of contracts) {
+    const directory = entries.find(
+      (item) => item.isDirectory() && sameAgentId(item.name, contract.agentId),
+    );
+    if (!directory) continue;
+    const agentDirectory = path.join(root, directory.name);
+    const runtimeConfigPath = path.join(agentDirectory, 'config.json');
+    const runtimeConfig = await readJsonObject(runtimeConfigPath, 'Elydora runtime config');
+    if (!runtimeConfig || runtimeConfig.agent_name !== AGENT_KEY) continue;
+    const files = [
+      [contract.guardPath, 'Elydora guard runtime'],
+      [contract.auditPath, 'Elydora audit runtime'],
+      [contract.guardWrapperPath, 'Auggie guard wrapper'],
+      [contract.auditWrapperPath, 'Auggie audit wrapper'],
+    ] as const;
+    const existence = await Promise.all(
+      files.map(([filePath, label]) => regularFileExists(filePath, label)),
+    );
+    if (existence.every(Boolean)) return true;
+  }
+  return false;
+}
diff --git a/src/plugins/augment.ts b/src/plugins/augment.ts
new file mode 100644
index 0000000..7b44174
--- /dev/null
+++ b/src/plugins/augment.ts
@@ -0,0 +1,75 @@
+import type { AgentPlugin, InstallConfig, PluginStatus } from './base.js';
+import { SUPPORTED_AGENTS } from './registry.js';
+import {
+  AGENT_KEY,
+  buildHandler,
+  buildWrapper,
+  removeManagedHooks,
+  runtimeContracts,
+  wrapperPaths,
+} from './augment-contract.js';
+import {
+  readConfig,
+  removeConfig,
+  requireRuntime,
+  runtimeFilesExist,
+  writeConfig,
+  writeWrapper,
+} from './augment-io.js';
+
+const entry = SUPPORTED_AGENTS.get(AGENT_KEY)!;
+
+export const augmentPlugin: AgentPlugin = {
+  async install(config: InstallConfig): Promise<void> {
+    if (!config.agentId) throw new Error('agentId is required');
+    const document = await readConfig();
+    await requireRuntime(config.guardScriptPath, 'Elydora guard runtime');
+    await requireRuntime(config.hookScriptPath, 'Elydora audit runtime');
+
+    const wrappers = wrapperPaths(config.agentId);
+    await writeWrapper(wrappers.guardPath, buildWrapper(config.guardScriptPath));
+    await writeWrapper(wrappers.auditPath, buildWrapper(config.hookScriptPath));
+
+    const cleaned = removeManagedHooks(document.hooks).hooks;
+    const hooks = {
+      ...cleaned,
+      PreToolUse: [
+        ...(cleaned.PreToolUse ?? []),
+        { matcher: '.*', hooks: [buildHandler(wrappers.guardPath)] },
+      ],
+      PostToolUse: [
+        ...(cleaned.PostToolUse ?? []),
+        { matcher: '.*', hooks: [buildHandler(wrappers.auditPath)] },
+      ],
+    };
+    await writeConfig(document.configPath, { ...document.root, hooks });
+    console.log('  Auggie: user-level PreToolUse and PostToolUse hooks installed.');
+  },
+
+  async uninstall(agentId?: string): Promise<void> {
+    const document = await readConfig();
+    if (!document.exists) return;
+    const result = removeManagedHooks(document.hooks, agentId);
+    if (!result.changed) return;
+    const root = { ...document.root };
+    if (Object.keys(result.hooks).length > 0) root.hooks = result.hooks;
+    else delete root.hooks;
+    if (Object.keys(root).length === 0) await removeConfig(document.configPath);
+    else await writeConfig(document.configPath, root);
+  },
+
+  async status(): Promise<PluginStatus> {
+    const document = await readConfig();
+    const contracts = runtimeContracts(document.hooks);
+    const hookConfigured = contracts.length > 0;
+    const hookScriptExists = hookConfigured ? await runtimeFilesExist(contracts) : false;
+    return {
+      installed: hookConfigured && hookScriptExists,
+      agentName: AGENT_KEY,
+      displayName: entry.name,
+      hookConfigured,
+      hookScriptExists,
+      configPath: document.configPath,
+    };
+  },
+};
diff --git a/src/plugins/registry.ts b/src/plugins/registry.ts
index 893995b..5697f6d 100644
--- a/src/plugins/registry.ts
+++ b/src/plugins/registry.ts
@@ -5,6 +5,7 @@ export interface AgentRegistryEntry {
 }
 
 export const SUPPORTED_AGENTS: ReadonlyMap<string, AgentRegistryEntry> = new Map([
+  ['augment', { name: 'Augment Code CLI', configDir: '~/.augment', configFile: 'settings.json' }],
   ['claudecode', { name: 'Claude Code', configDir: '~/.claude', configFile: 'settings.json' }],
   ['cursor', { name: 'Cursor', configDir: '.cursor', configFile: 'hooks.json' }],
   ['gemini', { name: 'Gemini CLI', configDir: '~/.gemini', configFile: 'settings.json' }],
diff --git a/test/augment-plugin.test.mjs b/test/augment-plugin.test.mjs
new file mode 100644
index 0000000..f07f3f4
--- /dev/null
+++ b/test/augment-plugin.test.mjs
@@ -0,0 +1,453 @@
+import assert from 'node:assert/strict';
+import { spawn } from 'node:child_process';
+import { mkdtemp, mkdir, readFile, readdir, rm, stat, 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/augment.js')).href;
+const registryModuleUrl = pathToFileURL(path.resolve('dist/plugins/registry.js')).href;
+const cliPath = path.resolve('dist/cli.js');
+const wrapperExtension = process.platform === 'win32' ? '.cmd' : '.sh';
+const guardWrapperName = `augment-guard${wrapperExtension}`;
+const auditWrapperName = `augment-hook${wrapperExtension}`;
+
+function runNode(args, env, input = '', cwd) {
+  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 runCommand(command, input = '') {
+  return new Promise((resolve, reject) => {
+    const child = spawn(command, { shell: true, 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 quotePosix(value) {
+  return `'${value.replaceAll("'", `'"'"'`)}'`;
+}
+
+function quoteWindows(value) {
+  return `"${value.replaceAll('"', '\\"')}"`;
+}
+
+function generatedCommand(wrapperPath) {
+  return process.platform === 'win32' ? quoteWindows(wrapperPath) : quotePosix(wrapperPath);
+}
+
+async function runPlugin(fixture, method, argument) {
+  const script = `
+    import { augmentPlugin } from ${JSON.stringify(pluginModuleUrl)};
+    const argument = JSON.parse(process.env.ELYDORA_TEST_ARGUMENT);
+    const result = await augmentPlugin[process.env.ELYDORA_TEST_METHOD](argument);
+    if (result !== undefined) console.log(JSON.stringify(result));
+  `;
+  return runNode(
+    ['--input-type=module', '--eval', script],
+    {
+      HOME: fixture.homeDir,
+      USERPROFILE: fixture.homeDir,
+      ELYDORA_TEST_ARGUMENT: JSON.stringify(argument),
+      ELYDORA_TEST_METHOD: method,
+    },
+    '',
+    fixture.workspaceDir,
+  );
+}
+
+async function createFixture({ existingSettings, guardSource, hookSource } = {}) {
+  const rootDir = await mkdtemp(path.join(os.tmpdir(), 'elydora-augment-'));
+  const homeDir = path.join(rootDir, "home with spaces and 'quote");
+  const workspaceDir = path.join(homeDir, 'workspace');
+  const agentDir = path.join(homeDir, '.elydora', 'agent-1');
+  const configPath = path.join(homeDir, '.augment', 'settings.json');
+  const guardScriptPath = path.join(agentDir, 'guard.js');
+  const hookScriptPath = path.join(agentDir, 'hook.js');
+  const guardWrapperPath = path.join(agentDir, guardWrapperName);
+  const auditWrapperPath = path.join(agentDir, auditWrapperName);
+  await mkdir(workspaceDir, { recursive: true });
+  await mkdir(agentDir, { recursive: true });
+  await writeFile(
+    guardScriptPath,
+    guardSource ?? "process.stderr.write('Agent is frozen by Elydora.'); process.exit(2);\n",
+  );
+  await writeFile(hookScriptPath, hookSource ?? 'process.exit(0);\n');
+  await writeFile(path.join(agentDir, 'config.json'), JSON.stringify({
+    agent_id: 'agent-1',
+    agent_name: 'augment',
+  }));
+  if (existingSettings !== undefined) {
+    await mkdir(path.dirname(configPath), { recursive: true });
+    await writeFile(configPath, typeof existingSettings === 'string'
+      ? existingSettings
+      : JSON.stringify(existingSettings, null, 2));
+  }
+  const fixture = {
+    agentDir,
+    auditWrapperPath,
+    configPath,
+    guardScriptPath,
+    guardWrapperPath,
+    homeDir,
+    hookScriptPath,
+    workspaceDir,
+    async close() {
+      await rm(rootDir, { recursive: true, force: true });
+    },
+  };
+  fixture.installResult = await runPlugin(fixture, 'install', {
+    agentName: 'augment',
+    agentId: 'agent-1',
+    baseUrl: 'https://api.elydora.com',
+    guardScriptPath,
+    hookScriptPath,
+  });
+  return fixture;
+}
+
+function managedHandler(settings, event, wrapperPath) {
+  const command = generatedCommand(wrapperPath);
+  for (const group of settings.hooks?.[event] ?? []) {
+    const handler = group.hooks.find((candidate) => candidate.command === command);
+    if (handler) return handler;
+  }
+  return undefined;
+}
+
+test('Augment Code CLI is registered in the SDK and CLI', async () => {
+  const { SUPPORTED_AGENTS } = await import(registryModuleUrl);
+  assert.deepEqual(SUPPORTED_AGENTS.get('augment'), {
+    name: 'Augment Code CLI',
+    configDir: '~/.augment',
+    configFile: 'settings.json',
+  });
+  const homeDir = await mkdtemp(path.join(os.tmpdir(), 'elydora-augment-cli-'));
+  const workspaceDir = path.join(homeDir, 'workspace');
+  await mkdir(workspaceDir);
+  try {
+    const result = await runNode(['--no-warnings', cliPath, 'status'], {
+      HOME: homeDir,
+      USERPROFILE: homeDir,
+    }, '', workspaceDir);
+    assert.equal(result.code, 0, result.stderr);
+    assert.match(result.stdout, /Augment Code CLI \(augment\)/);
+  } finally {
+    await rm(homeDir, { recursive: true, force: true });
+  }
+});
+
+test('Auggie install preserves user settings and is idempotent', async () => {
+  const existing = {
+    telemetryEnabled: false,
+    hooks: {
+      SessionStart: [{
+        hooks: [{ type: 'command', command: 'existing-command', args: ['one'], timeout: 5_000 }],
+        metadata: { includeUserContext: true },
+        label: 'keep group metadata',
+      }],
+      PreToolUse: [{
+        matcher: 'launch-process',
+        hooks: [{ type: 'command', command: 'user-command' }],
+      }],
+    },
+  };
+  const fixture = await createFixture({ existingSettings: existing });
+  try {
+    assert.equal(fixture.installResult.code, 0, fixture.installResult.stderr);
+    const second = await runPlugin(fixture, 'install', {
+      agentName: 'augment',
+      agentId: 'agent-1',
+      guardScriptPath: fixture.guardScriptPath,
+      hookScriptPath: fixture.hookScriptPath,
+    });
+    assert.equal(second.code, 0, second.stderr);
+    const settings = JSON.parse(await readFile(fixture.configPath, 'utf-8'));
+    assert.equal(settings.telemetryEnabled, false);
+    assert.deepEqual(settings.hooks.SessionStart, existing.hooks.SessionStart);
+    assert.deepEqual(settings.hooks.PreToolUse[0], existing.hooks.PreToolUse[0]);
+    assert.equal(settings.hooks.PreToolUse.length, 2);
+    assert.equal(settings.hooks.PostToolUse.length, 1);
+    assert.equal(settings.hooks.PreToolUse[1].matcher, '.*');
+    for (const [event, wrapperPath] of [
+      ['PreToolUse', fixture.guardWrapperPath],
+      ['PostToolUse', fixture.auditWrapperPath],
+    ]) {
+      const handler = managedHandler(settings, event, wrapperPath);
+      assert.deepEqual(Object.keys(handler).sort(), ['command', 'timeout', 'type']);
+      assert.equal(handler.type, 'command');
+      assert.equal(handler.timeout, 10_000);
+    }
+    const guardWrapper = await readFile(fixture.guardWrapperPath, 'utf-8');
+    const auditWrapper = await readFile(fixture.auditWrapperPath, 'utf-8');
+    assert.match(guardWrapper, new RegExp(path.basename(fixture.guardScriptPath).replace('.', '\\.')));
+    assert.match(auditWrapper, new RegExp(path.basename(fixture.hookScriptPath).replace('.', '\\.')));
+    if (process.platform !== 'win32') {
+      assert.equal((await stat(fixture.guardWrapperPath)).mode & 0o111, 0o100);
+      assert.match(guardWrapper, /^#!\/bin\/sh\nexec /);
+    } else {
+      assert.match(guardWrapper, /^@echo off\r?\n/);
+      assert.match(guardWrapper, /exit \/b %errorlevel%/);
+    }
+    await assert.rejects(
+      readFile(path.join(fixture.workspaceDir, '.augment', 'settings.json')),
+      { code: 'ENOENT' },
+    );
+    await assert.rejects(
+      readFile(path.join(fixture.workspaceDir, '.augment', 'settings.local.json')),
+      { code: 'ENOENT' },
+    );
+  } finally {
+    await fixture.close();
+  }
+});
+
+test('Auggie wrappers block freezes and forward official input byte-for-byte', async () => {
+  const capturePath = path.join(os.tmpdir(), `elydora-augment-event-${process.pid}-${Date.now()}.json`);
+  const hookSource = `
+    const fs = require('node:fs');
+    const chunks = [];
+    process.stdin.on('data', (chunk) => chunks.push(chunk));
+    process.stdin.on('end', () => fs.writeFileSync(${JSON.stringify(capturePath)}, Buffer.concat(chunks)));
+  `;
+  const fixture = await createFixture({ hookSource });
+  try {
+    assert.equal(fixture.installResult.code, 0, fixture.installResult.stderr);
+    const settings = JSON.parse(await readFile(fixture.configPath, 'utf-8'));
+    const guard = managedHandler(settings, 'PreToolUse', fixture.guardWrapperPath);
+    const audit = managedHandler(settings, 'PostToolUse', fixture.auditWrapperPath);
+    const prePayload = JSON.stringify({
+      hook_event_name: 'PreToolUse',
+      conversation_id: 'conversation-1',
+      workspace_roots: [fixture.workspaceDir],
+      tool_name: 'launch-process',
+      tool_input: { command: 'echo test' },
+      is_mcp_tool: false,
+    });
+    const guardResult = await runCommand(guard.command, prePayload);
+    assert.equal(guardResult.code, 2);
+    assert.match(guardResult.stderr, /Agent is frozen by Elydora/);
+    const postPayload = JSON.stringify({
+      hook_event_name: 'PostToolUse',
+      conversation_id: 'conversation-1',
+      workspace_roots: [fixture.workspaceDir],
+      tool_name: 'launch-process',
+      tool_input: { command: 'echo test' },
+      tool_output: 'test',
+      is_mcp_tool: false,
+    });
+    const auditResult = await runCommand(audit.command, postPayload);
+    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('Auggie status requires a complete pair, core runtimes, and wrappers', async () => {
+  const fixture = await createFixture();
+  try {
+    assert.equal(fixture.installResult.code, 0, fixture.installResult.stderr);
+    let status = await runPlugin(fixture, 'status', null);
+    assert.equal(JSON.parse(status.stdout).installed, true);
+    await rm(fixture.guardWrapperPath);
+    status = await runPlugin(fixture, 'status', null);
+    assert.equal(JSON.parse(status.stdout).installed, false);
+    await runPlugin(fixture, 'install', {
+      agentName: 'augment',
+      agentId: 'agent-1',
+      guardScriptPath: fixture.guardScriptPath,
+      hookScriptPath: fixture.hookScriptPath,
+    });
+    await rm(fixture.hookScriptPath);
+    status = await runPlugin(fixture, 'status', null);
+    assert.equal(JSON.parse(status.stdout).installed, false);
+  } finally {
+    await fixture.close();
+  }
+});
+
+test('Auggie uninstall removes exact ownership and preserves user groups', async () => {
+  const fixture = await createFixture({ existingSettings: {
+    owner: 'user',
+    hooks: { Notification: [] },
+  } });
+  try {
+    assert.equal(fixture.installResult.code, 0, fixture.installResult.stderr);
+    const settings = JSON.parse(await readFile(fixture.configPath, 'utf-8'));
+    settings.hooks.PreToolUse.unshift({ hooks: [], label: 'keep empty group' });
+    settings.hooks.PreToolUse[1].hooks.push({ type: 'command', command: 'user-command' });
+    settings.hooks.PreToolUse.push({ hooks: [{
+      type: 'command',
+      command: generatedCommand(`${fixture.guardWrapperPath}.backup`),
+      timeout: 10_000,
+    }] });
+    settings.hooks.PreToolUse.push({ hooks: [{
+      type: 'command',
+      command: generatedCommand(path.join(fixture.agentDir, '..', 'agent-10', guardWrapperName)),
+      timeout: 10_000,
+    }] });
+    await writeFile(fixture.configPath, JSON.stringify(settings, null, 2));
+    const uninstallId = process.platform === 'win32' ? 'AGENT-1' : 'agent-1';
+    const result = await runPlugin(fixture, 'uninstall', uninstallId);
+    assert.equal(result.code, 0, result.stderr);
+    const remaining = JSON.parse(await readFile(fixture.configPath, 'utf-8'));
+    assert.equal(remaining.owner, 'user');
+    assert.deepEqual(remaining.hooks.Notification, []);
+    assert.equal(remaining.hooks.PreToolUse.length, 4);
+    assert.deepEqual(remaining.hooks.PreToolUse[0], { hooks: [], label: 'keep empty group' });
+    assert.equal(remaining.hooks.PreToolUse[1].hooks[0].command, 'user-command');
+    assert.match(JSON.stringify(remaining), /augment-guard.*backup/);
+    assert.match(JSON.stringify(remaining), /agent-10/);
+    assert.equal(remaining.hooks.PostToolUse, undefined);
+  } finally {
+    await fixture.close();
+  }
+});
+
+test('Auggie install replaces stale Elydora handlers and preserves empty groups', async () => {
+  const fixture = await createFixture();
+  try {
+    assert.equal(fixture.installResult.code, 0, fixture.installResult.stderr);
+    const settings = JSON.parse(await readFile(fixture.configPath, 'utf-8'));
+    settings.hooks.PreToolUse.unshift({ hooks: [], label: 'keep empty group' });
+    for (const [event, wrapperName] of [
+      ['PreToolUse', guardWrapperName],
+      ['PostToolUse', auditWrapperName],
+    ]) {
+      settings.hooks[event].push({ hooks: [{
+        type: 'command',
+        command: generatedCommand(path.join(fixture.agentDir, '..', 'agent-old', wrapperName)),
+        timeout: 10_000,
+      }] });
+    }
+    await writeFile(fixture.configPath, JSON.stringify(settings, null, 2));
+    const result = await runPlugin(fixture, 'install', {
+      agentName: 'augment',
+      agentId: 'agent-1',
+      guardScriptPath: fixture.guardScriptPath,
+      hookScriptPath: fixture.hookScriptPath,
+    });
+    assert.equal(result.code, 0, result.stderr);
+    const current = JSON.parse(await readFile(fixture.configPath, 'utf-8'));
+    assert.doesNotMatch(JSON.stringify(current), /agent-old/);
+    assert.deepEqual(current.hooks.PreToolUse[0], { hooks: [], label: 'keep empty group' });
+    assert.equal(current.hooks.PreToolUse.length, 2);
+    assert.equal(current.hooks.PostToolUse.length, 1);
+  } finally {
+    await fixture.close();
+  }
+});
+
+test('Auggie uninstall removes settings owned entirely by Elydora', async () => {
+  const fixture = await createFixture();
+  try {
+    assert.equal(fixture.installResult.code, 0, fixture.installResult.stderr);
+    const result = await runPlugin(fixture, 'uninstall', 'agent-1');
+    assert.equal(result.code, 0, result.stderr);
+    await assert.rejects(readFile(fixture.configPath), { code: 'ENOENT' });
+  } finally {
+    await fixture.close();
+  }
+});
+
+test('Auggie rejects malformed settings and invalid hook contracts before writes', async () => {
+  const cases = [
+    '{ malformed',
+    'null',
+    '[]',
+    { hooks: null },
+    { hooks: { UnknownEvent: [] } },
+    { hooks: { PreToolUse: null } },
+    { hooks: { PreToolUse: [null] } },
+    { hooks: { SessionStart: [{ matcher: '.*', hooks: [] }] } },
+    { hooks: { PreToolUse: [{ matcher: '[', hooks: [] }] } },
+    { hooks: { PreToolUse: [{ hooks: null }] } },
+    { hooks: { PreToolUse: [{ hooks: [{ type: 'http', command: 'x' }] }] } },
+    { hooks: { PreToolUse: [{ hooks: [{ type: 'command', command: '', args: [] }] }] } },
+    { hooks: { PreToolUse: [{ hooks: [{ type: 'command', command: 'x', args: [1] }] }] } },
+    { hooks: { PreToolUse: [{ hooks: [{ type: 'command', command: 'x', timeout: 0 }] }] } },
+    { hooks: { PreToolUse: [{ hooks: [], metadata: { includeUserContext: 'yes' } }] } },
+  ];
+  for (const existingSettings of cases) {
+    const fixture = await createFixture({ existingSettings });
+    try {
+      assert.equal(fixture.installResult.code, 1, `${JSON.stringify(existingSettings)}\n${fixture.installResult.stderr}`);
+      const expected = typeof existingSettings === 'string'
+        ? existingSettings
+        : JSON.stringify(existingSettings, null, 2);
+      assert.equal(await readFile(fixture.configPath, 'utf-8'), expected);
+      await assert.rejects(readFile(fixture.guardWrapperPath), { code: 'ENOENT' });
+      await assert.rejects(readFile(fixture.auditWrapperPath), { code: 'ENOENT' });
+    } finally {
+      await fixture.close();
+    }
+  }
+});
+
+test('Auggie install rejects missing runtimes before creating files', async () => {
+  const homeDir = await mkdtemp(path.join(os.tmpdir(), 'elydora-augment-missing-'));
+  const workspaceDir = path.join(homeDir, 'workspace');
+  const agentDir = path.join(homeDir, '.elydora', 'agent-1');
+  const fixture = { homeDir, workspaceDir };
+  await mkdir(workspaceDir);
+  try {
+    const result = await runPlugin(fixture, 'install', {
+      agentName: 'augment',
+      agentId: 'agent-1',
+      guardScriptPath: path.join(agentDir, 'guard.js'),
+      hookScriptPath: path.join(agentDir, 'hook.js'),
+    });
+    assert.equal(result.code, 1);
+    assert.match(result.stderr, /runtime is missing/i);
+    await assert.rejects(readFile(path.join(homeDir, '.augment', 'settings.json')), { code: 'ENOENT' });
+    await assert.rejects(readFile(path.join(agentDir, guardWrapperName)), { code: 'ENOENT' });
+  } finally {
+    await rm(homeDir, { recursive: true, force: true });
+  }
+});
+
+test('Auggie status surfaces malformed referenced runtime metadata', async () => {
+  const fixture = await createFixture();
+  try {
+    assert.equal(fixture.installResult.code, 0, fixture.installResult.stderr);
+    await writeFile(path.join(fixture.agentDir, 'config.json'), '{ malformed');
+    const status = await runPlugin(fixture, 'status', null);
+    assert.equal(status.code, 1);
+    assert.match(status.stderr, /parse Elydora runtime config/i);
+  } finally {
+    await fixture.close();
+  }
+});
+
+test('Auggie atomic writes leave no temporary files', async () => {
+  const fixture = await createFixture();
+  try {
+    assert.equal(fixture.installResult.code, 0, fixture.installResult.stderr);
+    for (const directory of [fixture.agentDir, path.dirname(fixture.configPath)]) {
+      assert.equal((await readdir(directory)).some((name) => name.endsWith('.tmp')), false);
+    }
+  } finally {
+    await fixture.close();
+  }
+});