Add Devin CLI agent provider

README.md

@@ -66,7 +66,7 @@ countries and as low as $100 a year. <a href="https://app.harnessmd.com/console/
 > [!NOTE]
 > **The world's best agents. The world's worst paper company.**
 > Munder Difflin takes the terminal-agent CLIs you already run (`claude`, `agy`, `codex`, `grok`,
-> `kimi`, `qwen`, `opencode`, `crush`, `pi`, and `copilot`) and turns them
+> `kimi`, `qwen`, `opencode`, `crush`, `pi`, `copilot`, and `devin`) and turns them
 > into a self-coordinating team: each agent gets long-term memory, a mailbox, and a desk on a 2D
 > office floor, and **your clone** (Michael) routes work between them while you watch. He's the
 > boss of the floor; you're still the boss of him.
@@ -116,7 +116,7 @@ wires them into a **hive mind**, and puts **your clone** in charge. Michael is t
 talk to in order to get things done. Under the hood it runs the **fastest memory layer in the
 world** so every agent remembers what it learns and recalls it instantly.
 
-- **Every terminal is an agent.** Each `claude`, `agy`, `codex`, `grok`, `kimi`, `qwen`, `opencode`, `crush`, `pi`, `copilot`, or custom session runs as a real
+- **Every terminal is an agent.** Each `claude`, `agy`, `codex`, `grok`, `kimi`, `qwen`, `opencode`, `crush`, `pi`, `copilot`, `devin`, or custom session runs as a real
   process in a pseudo-terminal (`node-pty`), byte-for-byte authentic, rendered with xterm.js.
 - **Every agent is an avatar.** Sessions appear as characters on a Pixi.js office floor. They walk
   to stations as they work, and envelopes fly desk-to-desk when they message each other.
@@ -398,7 +398,8 @@ Everything below is for contributors and for people who want to run an unrelease
 - At least one supported agent CLI on your `PATH`, one of **[Claude Code](https://claude.com/claude-code)**
   (`claude`, the default), **Antigravity** (`agy`), **OpenAI Codex** (`codex`), **xAI Grok** (`grok`),
   **Kimi Code** (`kimi`), **Gemini CLI** (`gemini`), **Qwen** (`qwen`), **OpenCode** (`opencode`),
-  **Crush** (`crush`), **pi.dev** (`pi`), **GitHub Copilot** (`copilot`), or **Cursor** (`cursor-agent`).
+  **Crush** (`crush`), **pi.dev** (`pi`), **GitHub Copilot** (`copilot`), **Cursor** (`cursor-agent`),
+  or **[Devin CLI](https://docs.devin.ai/cli)** (`devin`).
   Most missing CLIs self-heal: the harness runs the installer in the
   terminal and continues into the new binary.
 - *Optional:* **your own API keys and local LLMs** in **Settings → AI Engines** (Ollama / LM Studio / vLLM).
@@ -416,6 +417,18 @@ npm run dev        # launches the Electron app with hot reload
 On first launch you'll go through the onboarding wizard, then land on the floor. Use **Add agent** to
 spawn your first session. The GOD agent seats itself in Michael's office automatically.
 
+To use Devin, select **Devin CLI** in Add agent and choose a SWE-2 model. The command field is
+editable, so you can add a personal prompt file, for example:
+
+```text
+devin --model swe-2 --permission-mode dangerous --prompt-file /path/to/DEVIN.md
+```
+
+The hive briefing is passed as Devin's initial interactive prompt. If you set `--prompt-file`,
+the app copies its contents and the hive briefing into a private per-agent prompt file because
+Devin rejects a prompt file together with an inline prompt. Your original file is untouched.
+Auto mode supplies `--permission-mode dangerous` when enabled.
+
 ### Other scripts
 
 ```bash

docs/model-catalog.json

@@ -120,6 +120,22 @@
       { "id": "claude-opus-4-8-high", "label": "Opus 4.8 1M", "minAppVersion": null, "maxAppVersion": null },
       { "id": "claude-sonnet-5-thinking-high", "label": "Sonnet 5 1M Thinking", "minAppVersion": null, "maxAppVersion": null }
     ],
+    "devin": [
+      { "label": "CLI default", "minAppVersion": null, "maxAppVersion": null },
+      { "id": "adaptive", "label": "Adaptive", "minAppVersion": null, "maxAppVersion": null },
+      { "id": "swe-2", "label": "SWE-2", "minAppVersion": null, "maxAppVersion": null },
+      { "id": "swe-2-high", "label": "SWE-2 High", "minAppVersion": null, "maxAppVersion": null },
+      { "id": "swe-2-medium", "label": "SWE-2 Medium", "minAppVersion": null, "maxAppVersion": null },
+      { "id": "swe-2-max", "label": "SWE-2 Max", "minAppVersion": null, "maxAppVersion": null },
+      { "id": "claude-opus-5-5-medium", "label": "Opus 5.5 Medium", "minAppVersion": null, "maxAppVersion": null },
+      { "id": "claude-fable-5-1-medium", "label": "Fable 5.1 Medium", "minAppVersion": null, "maxAppVersion": null },
+      { "id": "gpt-6-sol-medium", "label": "GPT-6 Sol Medium", "minAppVersion": null, "maxAppVersion": null },
+      { "id": "gpt-6-astra-medium", "label": "GPT-6 Astra Medium", "minAppVersion": null, "maxAppVersion": null },
+      { "id": "fusion-claude-opus-5-5-high-sidekick-swe-2-medium", "label": "Fusion · Opus 5.5 High + SWE-2 Medium", "minAppVersion": null, "maxAppVersion": null },
+      { "id": "fusion-claude-fable-5-1-high-sidekick-swe-2-medium", "label": "Fusion · Fable 5.1 High + SWE-2 Medium", "minAppVersion": null, "maxAppVersion": null },
+      { "id": "fusion-gpt-6-sol-high-sidekick-swe-2-medium", "label": "Fusion · GPT-6 Sol High + SWE-2 Medium", "minAppVersion": null, "maxAppVersion": null },
+      { "id": "fusion-gpt-6-astra-high-sidekick-swe-2-medium", "label": "Fusion · GPT-6 Astra High + SWE-2 Medium", "minAppVersion": null, "maxAppVersion": null }
+    ],
     "custom": []
   }
 }

src/main/devinPrompt.ts

@@ -0,0 +1,41 @@
+import { mkdirSync, readFileSync, writeFileSync } from 'node:fs';
+import { isAbsolute, join, resolve } from 'node:path';
+import { homedir } from 'node:os';
+
+/** Devin rejects --prompt-file together with a positional initial prompt. When
+ * the user supplied a prompt file, keep its contents and the hive briefing in
+ * one private file, then pass only --prompt-file to Devin. The user's file is
+ * never modified. Without a prompt file, leave `-- <hive prompt>` intact. */
+export function prepareDevinPromptFile(args: string[], cwd: string, agentDir: string): string[] {
+  const separator = args.lastIndexOf('--');
+  if (separator < 0 || separator !== args.length - 2) return args;
+
+  let fileArg = -1;
+  let sourcePath = '';
+  let equalsForm = false;
+  for (let i = 0; i < separator; i++) {
+    if (args[i] === '--prompt-file' && i + 1 < separator) {
+      fileArg = i + 1;
+      sourcePath = args[i + 1];
+      equalsForm = false;
+      i++;
+    } else if (args[i].startsWith('--prompt-file=')) {
+      fileArg = i;
+      sourcePath = args[i].slice('--prompt-file='.length);
+      equalsForm = true;
+    }
+  }
+  if (fileArg < 0) return args;
+
+  const expanded = sourcePath === '~' ? homedir() : sourcePath.startsWith('~/') ? join(homedir(), sourcePath.slice(2)) : sourcePath;
+  const source = isAbsolute(expanded) ? expanded : resolve(cwd, expanded);
+  const personalPrompt = readFileSync(source, 'utf8');
+  const privateDir = join(agentDir, '.devin');
+  mkdirSync(privateDir, { recursive: true, mode: 0o700 });
+  const combinedPath = join(privateDir, 'initial-prompt.md');
+  writeFileSync(combinedPath, `${personalPrompt.trimEnd()}\n\n${args[separator + 1]}\n`, { mode: 0o600 });
+
+  const result = args.slice(0, separator);
+  result[fileArg] = equalsForm ? `--prompt-file=${combinedPath}` : combinedPath;
+  return result;
+}

src/main/hive.ts

@@ -236,7 +236,7 @@ function shortRand(): string {
 const PROXY_BIND_ATTEMPTS = 3;
 const PROXY_BIND_BACKOFF_MS = [250, 750];
 
-const MINE_IGNORE_LINES = ['settings.json', 'cursor.json', 'inbox/', 'outbox/', '.codex/'];
+const MINE_IGNORE_LINES = ['settings.json', 'cursor.json', 'inbox/', 'outbox/', '.codex/', '.devin/'];
 
 /** Idempotently ensure `<agentDir>/.gitignore` excludes the non-memory files.
  *  Append-only: writes only the missing lines, leaving any existing entries. */

src/main/index.ts

@@ -80,6 +80,7 @@ import {
   type AgentProvider
 } from '../shared/agentProvider';
 import { buildMissingCliScript, chooseInstallRung } from './cliInstall';
+import { prepareDevinPromptFile } from './devinPrompt';
 import { detectNodeVersion, nodeIsUsable, resolveNodeInstaller } from './nodeInstall';
 import { toolCatalog, type ToolStatus } from '../shared/toolCatalog';
 import { listLocalSkills, loadCatalog, installSkill, uninstallSkill, type LocalSkill } from './skills';
@@ -2775,6 +2776,11 @@ async function spawnAgentCore(opts: AgentSpawnOptions, owner: Electron.WebConten
   // seedDelivery:'type-into-tui') rather than passed on argv. Surfaced in the spawn
   // result so the renderer types it through the per-pty write-chain. (ondev-b)
   let seedPrompt: string | undefined;
+  // Devin uses `-- <initial prompt>`; all CLI options must precede that
+  // separator. Main-only hires also need the same auto-mode posture as GUI hires.
+  if (provider === 'devin') {
+    opts.args = argsWithAutoModeFlag(opts.args ?? [], readConfig().autoMode, provider);
+  }
   if (opts.hive && hive.enabled()) {
     try {
       const inj = await hive.ensureAgent(
@@ -2796,7 +2802,10 @@ async function spawnAgentCore(opts: AgentSpawnOptions, owner: Electron.WebConten
           extraWritableDirs: [memory.env().MEMPALACE_PALACE_PATH].filter((p): p is string => !!p)
         }
       );
-      opts.args = [...(opts.args ?? []), ...inj.args];
+      const injectedArgs = [...(opts.args ?? []), ...inj.args];
+      opts.args = provider === 'devin'
+        ? prepareDevinPromptFile(injectedArgs, opts.cwd, inj.env.AGENT_DIR)
+        : injectedArgs;
       seedPrompt = inj.seedPrompt;
       // A degraded spawn (proxy bridge never bound) is told to the user the same
       // way breaker escalations are: a native toast, gated on the notifications
@@ -2905,7 +2914,13 @@ async function spawnAgentCore(opts: AgentSpawnOptions, owner: Electron.WebConten
     const sid = typedSid || (opts.resume === true ? hive.lastSession(opts.hive.id) : undefined);
     if (sid && rf) {
       const args = opts.args ?? [];
-      if (!args.includes(rf)) { args.push(rf, sid); opts.args = args; didResume = true; }
+      if (!args.includes(rf)) {
+        const promptSeparator = preset.initialPromptFlag === '--' ? args.indexOf('--') : -1;
+        if (promptSeparator >= 0) args.splice(promptSeparator, 0, rf, sid);
+        else args.push(rf, sid);
+        opts.args = args;
+        didResume = true;
+      }
     } else if (sid && rsub) {
       // Subcommand form (Codex): `codex resume [OPTIONS] [SESSION_ID]` — the
       // subcommand MUST be argv[0], the id trails the flags. Codex indexes

src/main/memory.ts

@@ -30,7 +30,7 @@ import { quarantineDirsToReap, quarantineStampMs, nextMineDelayMs } from './pala
  *  that are not currently running. See hive.ts for why `.codex/` matters beyond
  *  mempalace: it is also what stopped the hive's git repo from versioning every
  *  Codex transcript and sqlite log into a 7.5GB history. */
-const MINE_IGNORE_LINES = ['settings.json', 'cursor.json', 'inbox/', 'outbox/', '.codex/'];
+const MINE_IGNORE_LINES = ['settings.json', 'cursor.json', 'inbox/', 'outbox/', '.codex/', '.devin/'];
 
 /** Idempotently ensure `<agentDir>/.gitignore` excludes the non-memory files.
  *  Writes only the missing lines (append-only) so it's safe to call every cycle. */

src/main/realtimeActions.ts

@@ -164,7 +164,7 @@ const PENDING_TTL_MS = 120_000;
 const PROVIDER_COMMAND: Record<string, string> = {
   claude: 'claude', codex: 'codex', antigravity: 'antigravity', gemini: 'gemini',
   opencode: 'opencode', crush: 'crush', pi: 'pi', qwen: 'qwen', copilot: 'copilot',
-  cursor: 'cursor-agent'
+  cursor: 'cursor-agent', devin: 'devin'
 };
 
 /** Bare affirmations that must NEVER authorize a destructive op on their own —

src/renderer/src/components/AddAgentModal.tsx

@@ -1020,6 +1020,8 @@ export function AddAgentModal({ onClose, config, onConfigChange }: AddAgentModal
                             ? 'agy'
                             : provider === 'codex'
                               ? 'codex'
+                              : provider === 'devin'
+                                ? 'devin'
                               : provider === 'custom'
                                 ? 'your-agent-cli'
                                 : 'claude'

src/renderer/src/components/OnboardingWizard.tsx

@@ -84,7 +84,8 @@ const PROVIDER_BLURB_KEYS: Partial<Record<AgentProvider, string>> = {
   codex: 'onboarding.providerBlurb.codex',
   antigravity: 'onboarding.providerBlurb.antigravity',
   qwen: 'onboarding.providerBlurb.qwen',
-  cursor: 'onboarding.providerBlurb.cursor'
+  cursor: 'onboarding.providerBlurb.cursor',
+  devin: 'onboarding.providerBlurb.devin'
 };
 
 export function OnboardingWizard({ onComplete }: OnboardingWizardProps) {

src/renderer/src/i18n/locales/en.json

@@ -642,7 +642,8 @@
       "antigravity": "Antigravity — Google Gemini",
       "qwen": "Qwen — runs a local Qwen model on your machine",
       "gemini": "Gemini CLI - Google Gemini",
-      "cursor": "Cursor Agent CLI — uses your Cursor credits (Luna, Composer, …)"
+      "cursor": "Cursor Agent CLI — uses your Cursor credits (Luna, Composer, …)",
+      "devin": "Devin CLI — local agent with SWE-2 models"
     },
     "home": {
       "descPlain": "Create a new, empty folder for the app to call home. Everything the app remembers — its own settings and your agents' memory — is stored here. Something like ~/HarnessAgents works well. We'll create it for you if it doesn't exist.",

src/renderer/src/realtime/actions.ts

@@ -187,7 +187,7 @@ export function realtimeActionTools(): ReturnType<typeof tool>[] {
       parameters: {
         type: 'object',
         properties: {
-          provider: { type: 'string', description: 'Engine: claude (default), codex, gemini, opencode, crush, pi, qwen, copilot, cursor.' },
+          provider: { type: 'string', description: 'Engine: claude (default), codex, gemini, opencode, crush, pi, qwen, copilot, cursor, devin.' },
           role: { type: 'string', description: 'Optional. The role/job for the new agent.' },
           name: { type: 'string', description: 'Optional. A name for the agent.' },
           cwd: { type: 'string', description: 'Optional. Working directory; defaults to the hive root.' }

src/renderer/src/store/config.ts

@@ -230,6 +230,8 @@ export type { CatalogModel, ModelCatalog } from '@shared/modelCatalogPayload';
  *  - cursor: ids match `cursor-agent models` / `--model` (Cursor account catalog).
  *    Luna is the cheap, high-context default for Michael; the rest are curated
  *    quick-picks and the command field stays editable for any live slug.
+ *  - devin: `devin models list` accepts the SWE-2 family slug or its specific
+ *    variants. The command field also accepts the user's `--prompt-file` flag.
  *  - grok: the models reported by the installed Grok CLI (`grok models`).
  *  - kimi: managed Kimi Code aliases accepted by `kimi --model <alias>`.
  *  - custom: no presets at all; the command field is the whole interface.

src/shared/agentProvider.ts

@@ -34,6 +34,7 @@ export type AgentProvider =
   | 'pi'
   | 'copilot'
   | 'cursor'
+  | 'devin'
   | 'custom';
 
 /** Structured descriptor for how a NON-hiveAware provider gets hive lifecycle
@@ -567,6 +568,29 @@ export const AGENT_PROVIDER_PRESETS: AgentProviderPreset[] = [
     },
     docsUrl: 'https://cursor.com/docs/cli/install'
   },
+  {
+    id: 'devin',
+    label: 'Devin CLI',
+    defaultCommand: 'devin',
+    commandGroups: [],
+    // Devin's interactive CLI accepts the hive briefing after `--` as its
+    // initial prompt. It remains open for subsequent turns and inbox nudges.
+    autoModeFlag: '--permission-mode dangerous',
+    autoFlag: '--permission-mode dangerous',
+    autoStanceTokens: ['--permission-mode', '--sandbox'],
+    supportsModel: true,
+    modelFlag: '--model',
+    hiveAware: false,
+    canReceiveInbox: true,
+    initialPromptFlag: '--',
+    recommendedOrchestratorModel: 'swe-2',
+    resumeFlag: '--resume',
+    nativeInstallCommand: {
+      posix: 'curl -fsSL https://cli.devin.ai/install.sh | bash',
+      win32: 'powershell -c irm https://static.devin.ai/cli/setup.ps1 ^| iex'
+    },
+    docsUrl: 'https://docs.devin.ai/cli'
+  },
   {
     id: 'custom',
     label: 'Custom',
@@ -594,6 +618,7 @@ export function isAgentProvider(value: unknown): value is AgentProvider {
     value === 'pi' ||
     value === 'copilot' ||
     value === 'cursor' ||
+    value === 'devin' ||
     value === 'custom'
   );
 }
@@ -633,8 +658,11 @@ function commandBinary(command: string | undefined): string {
 /** Infer the provider from a command (or honor an explicit override). */
 export function inferAgentProvider(command: string | undefined, explicit?: unknown): AgentProvider {
   const normalized = normalizeAgentProvider(explicit);
-  if (normalized) return normalized;
   const bin = commandBinary(command);
+  // Older installs stored Devin commands as explicit `custom` agents because
+  // Devin had no preset. Recognise those on restore so existing agents inherit
+  // the model, prompt-file and permission handling without being recreated.
+  if (normalized && !(normalized === 'custom' && bin === 'devin')) return normalized;
   if (bin === 'codex') return 'codex';
   if (bin === 'grok') return 'grok';
   if (bin === 'kimi') return 'kimi';
@@ -645,6 +673,7 @@ export function inferAgentProvider(command: string | undefined, explicit?: unkno
   if (bin === 'crush') return 'crush';
   if (bin === 'pi') return 'pi';
   if (bin === 'copilot') return 'copilot';
+  if (bin === 'devin') return 'devin';
   // Cursor ships as `cursor-agent`; `agent` is a shorter alias (generic name — check last).
   if (bin === 'cursor-agent') return 'cursor';
   if (bin === 'agent') return 'cursor';
@@ -699,7 +728,7 @@ export function hasAutoModeStance(args: string[], provider: AgentProvider): bool
   const flag = preset.autoModeFlag ?? '';
   const lead = flag.trim().split(/\s+/)[0];
   const stance = new Set([...(lead ? [lead] : []), ...(preset.autoStanceTokens ?? [])]);
-  return args.some((a) => stance.has(a));
+  return args.some((a) => stance.has(a.split('=', 1)[0]));
 }
 
 /** Returns any env vars the provider needs for non-interactive / first-run suppression. */

src/shared/modelCatalog.json

@@ -108,6 +108,22 @@
       { "id": "claude-opus-4-8-high", "label": "Opus 4.8 1M", "minAppVersion": null, "maxAppVersion": null },
       { "id": "claude-sonnet-5-thinking-high", "label": "Sonnet 5 1M Thinking", "minAppVersion": null, "maxAppVersion": null }
     ],
+    "devin": [
+      { "label": "CLI default", "minAppVersion": null, "maxAppVersion": null },
+      { "id": "adaptive", "label": "Adaptive", "minAppVersion": null, "maxAppVersion": null },
+      { "id": "swe-2", "label": "SWE-2", "minAppVersion": null, "maxAppVersion": null },
+      { "id": "swe-2-high", "label": "SWE-2 High", "minAppVersion": null, "maxAppVersion": null },
+      { "id": "swe-2-medium", "label": "SWE-2 Medium", "minAppVersion": null, "maxAppVersion": null },
+      { "id": "swe-2-max", "label": "SWE-2 Max", "minAppVersion": null, "maxAppVersion": null },
+      { "id": "claude-opus-5-5-medium", "label": "Opus 5.5 Medium", "minAppVersion": null, "maxAppVersion": null },
+      { "id": "claude-fable-5-1-medium", "label": "Fable 5.1 Medium", "minAppVersion": null, "maxAppVersion": null },
+      { "id": "gpt-6-sol-medium", "label": "GPT-6 Sol Medium", "minAppVersion": null, "maxAppVersion": null },
+      { "id": "gpt-6-astra-medium", "label": "GPT-6 Astra Medium", "minAppVersion": null, "maxAppVersion": null },
+      { "id": "fusion-claude-opus-5-5-high-sidekick-swe-2-medium", "label": "Fusion · Opus 5.5 High + SWE-2 Medium", "minAppVersion": null, "maxAppVersion": null },
+      { "id": "fusion-claude-fable-5-1-high-sidekick-swe-2-medium", "label": "Fusion · Fable 5.1 High + SWE-2 Medium", "minAppVersion": null, "maxAppVersion": null },
+      { "id": "fusion-gpt-6-sol-high-sidekick-swe-2-medium", "label": "Fusion · GPT-6 Sol High + SWE-2 Medium", "minAppVersion": null, "maxAppVersion": null },
+      { "id": "fusion-gpt-6-astra-high-sidekick-swe-2-medium", "label": "Fusion · GPT-6 Astra High + SWE-2 Medium", "minAppVersion": null, "maxAppVersion": null }
+    ],
     "custom": []
   }
 }