Add Devin CLI as a selectable agent backend in plan2code-loop

Upstream replaced GitHub Copilot CLI with Devin; Plan2Code keeps both, so
Claude Code, Copilot CLI and Devin are all selectable and existing Copilot
selections keep working.

AI Assisted

plan2code-loop/README.md

@@ -109,6 +109,7 @@ The scratchpad is managed by the LLM itself - after each task, the AI appends no
 |-------|--------|
 | Claude Code | Supported |
 | GitHub Copilot CLI | Supported |
+| Devin CLI | Supported |
 
 The loop uses your configured default model for each agent.
 
@@ -119,7 +120,7 @@ $ plan2code-loop
 
     ╭──────────────────────────────────────╮
     │                                      │
-    │   🔮  Plany's Loop               │
+    │   🔮  Planny's Loop                  │
     │       Autonomous Implementation      │
     │                                      │
     ╰──────────────────────────────────────╯
@@ -196,7 +197,8 @@ src/
 ├── cli.ts                    # Interactive prompts
 ├── agents/                   # Agent implementations
 │   ├── claude-code.ts
-│   └── copilot-cli.ts
+│   ├── copilot-cli.ts
+│   └── devin-cli.ts
 ├── prompt/                   # Prompt building
 │   ├── templates.ts
 │   └── builder.ts

plan2code-loop/package.json

@@ -1,46 +1,47 @@
-{
-  "name": "plan2code-loop",
-  "version": "1.6.2",
-  "description": "Plan2Code Loop - Autonomous spec-driven implementation CLI",
-  "type": "module",
-  "main": "dist/index.js",
-  "bin": {
-    "plan2code-loop": "./dist/bin/plan2code-loop.js"
-  },
-  "files": [
-    "dist"
-  ],
-  "engines": {
-    "node": ">=18.0.0"
-  },
-  "keywords": [
-    "cli",
-    "ai",
-    "agent",
-    "automation",
-    "claude",
-    "copilot",
-    "spec-driven"
-  ],
-  "license": "MIT",
-  "scripts": {
-    "build": "tsup",
-    "dev": "tsup --watch",
-    "start": "node dist/bin/plan2code-loop.js",
-    "prepublishOnly": "npm run build"
-  },
-  "dependencies": {
-    "@inquirer/prompts": "^8.1.0",
-    "chalk": "^5.6.2",
-    "execa": "^9.6.1",
-    "fs-extra": "^11.3.3",
-    "ora": "^9.0.0"
-  },
-  "devDependencies": {
-    "@types/fs-extra": "^11.0.4",
-    "@types/node": "^25.0.3",
-    "tsup": "^8.5.1",
-    "typescript": "^5.9.3"
-  }
-}
-
+{
+  "name": "plan2code-loop",
+  "version": "1.6.2",
+  "description": "Plan2Code Loop - Autonomous spec-driven implementation CLI",
+  "type": "module",
+  "main": "dist/index.js",
+  "bin": {
+    "plan2code-loop": "./dist/bin/plan2code-loop.js"
+  },
+  "files": [
+    "dist"
+  ],
+  "engines": {
+    "node": ">=18.0.0"
+  },
+  "keywords": [
+    "cli",
+    "ai",
+    "agent",
+    "automation",
+    "claude",
+    "copilot",
+    "devin",
+    "spec-driven"
+  ],
+  "license": "MIT",
+  "scripts": {
+    "build": "tsup",
+    "dev": "tsup --watch",
+    "start": "node dist/bin/plan2code-loop.js",
+    "prepublishOnly": "npm run build"
+  },
+  "dependencies": {
+    "@inquirer/prompts": "^8.1.0",
+    "chalk": "^5.6.2",
+    "execa": "^9.6.1",
+    "fs-extra": "^11.3.3",
+    "ora": "^9.0.0"
+  },
+  "devDependencies": {
+    "@types/fs-extra": "^11.0.4",
+    "@types/node": "^25.0.3",
+    "tsup": "^8.5.1",
+    "typescript": "^5.9.3"
+  }
+}
+

plan2code-loop/src/agents/devin-cli.ts

@@ -0,0 +1,81 @@
+import type { Agent, AgentConfig, AgentExecutionOptions, AgentExecutionResult } from './types.js';
+import { executeCommand } from '../utils/process.js';
+import { writeFileSync, unlinkSync } from 'fs';
+import { join } from 'path';
+import { tmpdir } from 'os';
+
+const devinCliConfig: AgentConfig = {
+  name: 'devin-cli',
+  displayName: 'Devin CLI',
+  command: 'devin',
+  models: [
+    { value: 'default', label: 'Default (use Devin config)' },
+  ],
+  defaultModel: 'default',
+  flags: {
+    prompt: '--print',
+    promptFile: '--prompt-file',
+    model: '--model',
+    skipPermissions: '--permission-mode',
+  },
+};
+
+class DevinCliAgent implements Agent {
+  readonly config = devinCliConfig;
+
+  async execute(options: AgentExecutionOptions): Promise<AgentExecutionResult> {
+    // Devin CLI takes the prompt via --prompt-file rather than stdin
+    const tempFile = join(tmpdir(), `plan2code-prompt-${Date.now()}.txt`);
+    writeFileSync(tempFile, options.prompt, 'utf-8');
+
+    try {
+      const args: string[] = [
+        this.config.flags.prompt,                 // --print for non-interactive mode
+        this.config.flags.promptFile!, tempFile,   // --prompt-file <path>
+        this.config.flags.skipPermissions, 'dangerous', // --permission-mode dangerous (auto-approve all tools)
+      ];
+
+      // Only add --model if not using default
+      if (options.model && options.model !== 'default') {
+        args.push(this.config.flags.model, options.model);
+      }
+
+      const result = await executeCommand({
+        command: this.config.command,
+        args,
+        cwd: options.cwd,
+        timeout: options.timeout,
+        signal: options.signal,
+      });
+
+      return {
+        stdout: result.stdout,
+        stderr: result.stderr,
+        exitCode: result.exitCode,
+        timedOut: result.timedOut,
+        cancelled: result.cancelled,
+        duration: result.duration,
+      };
+    } finally {
+      // Clean up temp file
+      try {
+        unlinkSync(tempFile);
+      } catch {
+        // Ignore cleanup errors
+      }
+    }
+  }
+
+  async isAvailable(): Promise<boolean> {
+    // Run devin --version to verify it's actually installed and working
+    const result = await executeCommand({
+      command: this.config.command,
+      args: ['--version'],
+      cwd: process.cwd(),
+      timeout: 5000,
+    });
+    return result.exitCode === 0;
+  }
+}
+
+export const devinCliAgent = new DevinCliAgent();

plan2code-loop/src/agents/index.ts

@@ -1,19 +1,22 @@
-export type {
-  Agent,
-  AgentConfig,
-  AgentExecutionOptions,
-  AgentExecutionResult,
-  ModelOption,
-} from './types.js';
-
-export { agentRegistry } from './registry.js';
-export { claudeCodeAgent } from './claude-code.js';
-export { copilotCliAgent } from './copilot-cli.js';
-
-// Register all agents
-import { agentRegistry } from './registry.js';
-import { claudeCodeAgent } from './claude-code.js';
-import { copilotCliAgent } from './copilot-cli.js';
-
-agentRegistry.register(claudeCodeAgent);
-agentRegistry.register(copilotCliAgent);
+export type {
+  Agent,
+  AgentConfig,
+  AgentExecutionOptions,
+  AgentExecutionResult,
+  ModelOption,
+} from './types.js';
+
+export { agentRegistry } from './registry.js';
+export { claudeCodeAgent } from './claude-code.js';
+export { copilotCliAgent } from './copilot-cli.js';
+export { devinCliAgent } from './devin-cli.js';
+
+// Register all agents
+import { agentRegistry } from './registry.js';
+import { claudeCodeAgent } from './claude-code.js';
+import { copilotCliAgent } from './copilot-cli.js';
+import { devinCliAgent } from './devin-cli.js';
+
+agentRegistry.register(claudeCodeAgent);
+agentRegistry.register(copilotCliAgent);
+agentRegistry.register(devinCliAgent);

plan2code-loop/src/agents/types.ts

@@ -1,42 +1,43 @@
-export interface ModelOption {
-  value: string;
-  label: string;
-}
-
-export interface AgentConfig {
-  name: string;
-  displayName: string;
-  command: string;
-  models: ModelOption[];
-  defaultModel: string;
-  flags: {
-    prompt: string;
-    model: string;
-    skipPermissions: string;
-    silent?: string;
-  };
-}
-
-export interface AgentExecutionOptions {
-  prompt: string;
-  model: string;
-  timeout: number;       // milliseconds
-  verbose: boolean;
-  cwd: string;
-  signal?: AbortSignal;  // For cancellation
-}
-
-export interface AgentExecutionResult {
-  stdout: string;
-  stderr: string;
-  exitCode: number;
-  timedOut: boolean;
-  cancelled: boolean;
-  duration: number;      // milliseconds
-}
-
-export interface Agent {
-  config: AgentConfig;
-  execute(options: AgentExecutionOptions): Promise<AgentExecutionResult>;
-  isAvailable(): Promise<boolean>;
-}
+export interface ModelOption {
+  value: string;
+  label: string;
+}
+
+export interface AgentConfig {
+  name: string;
+  displayName: string;
+  command: string;
+  models: ModelOption[];
+  defaultModel: string;
+  flags: {
+    prompt: string;
+    model: string;
+    skipPermissions: string;
+    silent?: string;
+    promptFile?: string;
+  };
+}
+
+export interface AgentExecutionOptions {
+  prompt: string;
+  model: string;
+  timeout: number;       // milliseconds
+  verbose: boolean;
+  cwd: string;
+  signal?: AbortSignal;  // For cancellation
+}
+
+export interface AgentExecutionResult {
+  stdout: string;
+  stderr: string;
+  exitCode: number;
+  timedOut: boolean;
+  cancelled: boolean;
+  duration: number;      // milliseconds
+}
+
+export interface Agent {
+  config: AgentConfig;
+  execute(options: AgentExecutionOptions): Promise<AgentExecutionResult>;
+  isAvailable(): Promise<boolean>;
+}

plan2code-loop/src/state/config.ts

@@ -1,35 +1,35 @@
-export type LoopMode = 'task' | 'phase';
-
-export interface SessionConfig {
-  agent: string;              // "claude-code" | "copilot-cli"
-  model: string;              // Selected model
-  maxIterations: number;      // 5-50
-  timeout: number;            // Base timeout in minutes per iteration attempt
-  maxRetries: number;         // Max retry attempts per iteration (timeout increments by 30s each retry)
-  verbose: boolean;
-  specPath: string;           // Path to the spec directory
-  startedAt: string;          // ISO timestamp
-  currentIteration: number;
-  jiraTicketId?: string;      // JIRA ticket ID for commit messages
-  loopMode: LoopMode;         // "task" = one task per loop, "phase" = one phase per loop
-}
-
-export interface IterationLogEntry {
-  iteration: number;
-  timestamp: string;          // ISO timestamp
-  duration: number;           // milliseconds
-  exitCode: number;
-  status: 'running' | 'completed' | 'error' | 'timeout' | 'interrupted' | 'blocked';
-  completionMarker?: string;
-}
-
-export type SessionState = 'new' | 'continue' | 'changed';
-
-export const DEFAULT_CONFIG: Partial<SessionConfig> = {
-  maxIterations: 100,
-  timeout: 3,
-  maxRetries: 5,
-  verbose: false,
-  currentIteration: 0,
-  loopMode: 'task',
-};
+export type LoopMode = 'task' | 'phase';
+
+export interface SessionConfig {
+  agent: string;              // "claude-code" | "copilot-cli" | "devin-cli"
+  model: string;              // Selected model
+  maxIterations: number;      // 5-50
+  timeout: number;            // Base timeout in minutes per iteration attempt
+  maxRetries: number;         // Max retry attempts per iteration (timeout increments by 30s each retry)
+  verbose: boolean;
+  specPath: string;           // Path to the spec directory
+  startedAt: string;          // ISO timestamp
+  currentIteration: number;
+  jiraTicketId?: string;      // JIRA ticket ID for commit messages
+  loopMode: LoopMode;         // "task" = one task per loop, "phase" = one phase per loop
+}
+
+export interface IterationLogEntry {
+  iteration: number;
+  timestamp: string;          // ISO timestamp
+  duration: number;           // milliseconds
+  exitCode: number;
+  status: 'running' | 'completed' | 'error' | 'timeout' | 'interrupted' | 'blocked';
+  completionMarker?: string;
+}
+
+export type SessionState = 'new' | 'continue' | 'changed';
+
+export const DEFAULT_CONFIG: Partial<SessionConfig> = {
+  maxIterations: 100,
+  timeout: 3,
+  maxRetries: 5,
+  verbose: false,
+  currentIteration: 0,
+  loopMode: 'task',
+};