feat: add Claude Code provider support

Implements Claude Code as a new AI provider that uses the Claude Code CLI
without requiring API keys. This enables users to leverage Claude models
through their local Claude Code installation.

Key changes:
- Add complete AI SDK v1 implementation for Claude Code provider
  - Custom SDK with streaming/non-streaming support
  - Session management for conversation continuity
  - JSON extraction for object generation mode
  - Support for advanced settings (maxTurns, allowedTools, etc.)

- Integrate Claude Code into Task Master's provider system
  - Update ai-services-unified.js to handle keyless authentication
  - Add provider to supported-models.json with opus/sonnet models
  - Ensure correct maxTokens values are applied (opus: 32000, sonnet: 64000)

- Fix maxTokens configuration issue
  - Add max_tokens property to getAvailableModels() output
  - Update setModel() to properly handle claude-code models
  - Create update-config-tokens.js utility for init process

- Add comprehensive documentation
  - User guide with configuration examples
  - Advanced settings explanation and future integration options

The implementation maintains full backward compatibility with existing
providers while adding seamless Claude Code support to all Task Master
commands.

docs/examples/claude-code-usage.md

@@ -0,0 +1,162 @@
+# Claude Code Provider Usage Example
+
+The Claude Code provider allows you to use Claude models through the Claude Code CLI without requiring an API key.
+
+## Configuration
+
+To use the Claude Code provider, update your `.taskmaster/config.json`:
+
+```json
+{
+  "models": {
+    "main": {
+      "provider": "claude-code",
+      "modelId": "sonnet",
+      "maxTokens": 64000,
+      "temperature": 0.2
+    },
+    "research": {
+      "provider": "claude-code",
+      "modelId": "opus",
+      "maxTokens": 32000,
+      "temperature": 0.1
+    },
+    "fallback": {
+      "provider": "claude-code",
+      "modelId": "sonnet",
+      "maxTokens": 64000,
+      "temperature": 0.2
+    }
+  }
+}
+```
+
+## Available Models
+
+- `opus` - Claude Opus model (SWE score: 0.725)
+- `sonnet` - Claude Sonnet model (SWE score: 0.727)
+
+## Usage
+
+Once configured, you can use Claude Code with all Task Master commands:
+
+```bash
+# Generate tasks from a PRD
+task-master parse-prd "Build a todo app with React"
+
+# Get a complexity estimate
+task-master estimate
+
+# Analyze project complexity
+task-master analyze
+
+# Work on tasks
+task-master do task-001
+```
+
+## Requirements
+
+1. Claude Code CLI must be installed and authenticated on your system
+2. No API key is required in your environment variables or MCP configuration
+
+## Advanced Settings
+
+The Claude Code SDK supports additional settings that provide fine-grained control over Claude's behavior. While these settings are implemented in the underlying SDK (`src/ai-providers/custom-sdk/claude-code/`), they are not currently exposed through Task Master's standard API due to architectural constraints.
+
+### Supported Settings
+
+```javascript
+const settings = {
+  // Maximum conversation turns Claude can make in a single request
+  maxTurns: 5,
+  
+  // Custom system prompt to override Claude Code's default behavior
+  customSystemPrompt: "You are a helpful assistant focused on code quality",
+  
+  // Permission mode for file system operations
+  permissionMode: 'default', // Options: 'default', 'restricted', 'permissive'
+  
+  // Explicitly allow only certain tools
+  allowedTools: ['Read', 'LS'], // Claude can only read files and list directories
+  
+  // Explicitly disallow certain tools
+  disallowedTools: ['Write', 'Edit'], // Prevent Claude from modifying files
+  
+  // MCP servers for additional tool integrations
+  mcpServers: []
+};
+```
+
+### Current Limitations
+
+Task Master uses a standardized `BaseAIProvider` interface that only passes through common parameters (modelId, messages, maxTokens, temperature) to maintain consistency across all providers. The Claude Code advanced settings are implemented in the SDK but not accessible through Task Master's high-level commands.
+
+### Future Integration Options
+
+For developers who need to use these advanced settings, there are three potential approaches:
+
+#### Option 1: Extend BaseAIProvider
+Modify the core Task Master architecture to support provider-specific settings:
+
+```javascript
+// In BaseAIProvider
+const result = await generateText({
+  model: client(params.modelId),
+  messages: params.messages,
+  maxTokens: params.maxTokens,
+  temperature: params.temperature,
+  ...params.providerSettings // New: pass through provider-specific settings
+});
+```
+
+#### Option 2: Override Methods in ClaudeCodeProvider
+Create custom implementations that extract and use Claude-specific settings:
+
+```javascript
+// In ClaudeCodeProvider
+async generateText(params) {
+  const { maxTurns, allowedTools, disallowedTools, ...baseParams } = params;
+  
+  const client = this.getClient({
+    ...baseParams,
+    settings: { maxTurns, allowedTools, disallowedTools }
+  });
+  
+  // Continue with generation...
+}
+```
+
+#### Option 3: Direct SDK Usage
+For immediate access to advanced features, developers can use the Claude Code SDK directly:
+
+```javascript
+import { createClaudeCode } from 'task-master-ai/ai-providers/custom-sdk/claude-code';
+
+const claude = createClaudeCode({
+  defaultSettings: {
+    maxTurns: 5,
+    allowedTools: ['Read', 'LS'],
+    disallowedTools: ['Write', 'Edit']
+  }
+});
+
+const model = claude('sonnet');
+const result = await generateText({
+  model,
+  messages: [{ role: 'user', content: 'Analyze this code...' }]
+});
+```
+
+### Why These Settings Matter
+
+- **maxTurns**: Useful for complex refactoring tasks that require multiple iterations
+- **customSystemPrompt**: Allows specializing Claude for specific domains or coding standards
+- **permissionMode**: Critical for security in production environments
+- **allowedTools/disallowedTools**: Enable read-only analysis modes or restrict access to sensitive operations
+- **mcpServers**: Future extensibility for custom tool integrations
+
+## Notes
+
+- The Claude Code provider doesn't track usage costs (shown as 0 in telemetry)
+- Session management is handled automatically for conversation continuity
+- Some AI SDK parameters (temperature, maxTokens) are not supported by Claude Code CLI and will be ignored

scripts/init.js

@@ -28,6 +28,7 @@ import {
 	convertAllRulesToProfileRules,
 	getRulesProfile
 } from '../src/utils/rule-transformer.js';
+import { updateConfigMaxTokens } from './modules/update-config-tokens.js';
 
 import { execSync } from 'child_process';
 import {
@@ -507,6 +508,14 @@ function createProjectStructure(
 		}
 	);
 	
+	// Update config.json with correct maxTokens values from supported-models.json
+	const configPath = path.join(targetDir, TASKMASTER_CONFIG_FILE);
+	if (updateConfigMaxTokens(configPath)) {
+		log('info', 'Updated config with correct maxTokens values');
+	} else {
+		log('warn', 'Could not update maxTokens in config');
+	}
+
 	// Copy .gitignore
 	copyTemplateFile('gitignore', path.join(targetDir, GITIGNORE_FILE));
 

scripts/modules/ai-services-unified.js

@@ -44,7 +44,8 @@ import {
 	OllamaAIProvider,
 	BedrockAIProvider,
 	AzureProvider,
-	VertexAIProvider
+	VertexAIProvider,
+	ClaudeCodeProvider
 } from '../../src/ai-providers/index.js';
 
 // Create provider instances
@@ -58,7 +59,8 @@ const PROVIDERS = {
 	ollama: new OllamaAIProvider(),
 	bedrock: new BedrockAIProvider(),
 	azure: new AzureProvider(),
-	vertex: new VertexAIProvider()
+	vertex: new VertexAIProvider(),
+	'claude-code': new ClaudeCodeProvider()
 };
 
 // Helper function to get cost for a specific model
@@ -225,6 +227,11 @@ function _extractErrorMessage(error) {
  * @throws {Error} If a required API key is missing.
  */
 function _resolveApiKey(providerName, session, projectRoot = null) {
+	// Claude Code doesn't require an API key
+	if (providerName === 'claude-code') {
+		return 'claude-code-no-key-required';
+	}
+
 	const keyMap = {
 		openai: 'OPENAI_API_KEY',
 		anthropic: 'ANTHROPIC_API_KEY',
@@ -236,7 +243,8 @@ function _resolveApiKey(providerName, session, projectRoot = null) {
 		xai: 'XAI_API_KEY',
 		ollama: 'OLLAMA_API_KEY',
 		bedrock: 'AWS_ACCESS_KEY_ID',
-		vertex: 'GOOGLE_API_KEY'
+		vertex: 'GOOGLE_API_KEY',
+		'claude-code': 'CLAUDE_CODE_API_KEY' // Not actually used, but included for consistency
 	};
 
 	const envVarName = keyMap[providerName];

scripts/modules/config-manager.js

@@ -507,6 +507,11 @@ function isApiKeySet(providerName, session = null, projectRoot = null) {
 		return true; // Indicate key status is effectively "OK"
 	}
 
+	// Claude Code doesn't require an API key
+	if (providerName?.toLowerCase() === 'claude-code') {
+		return true; // No API key needed
+	}
+
 	const keyMap = {
 		openai: 'OPENAI_API_KEY',
 		anthropic: 'ANTHROPIC_API_KEY',
@@ -517,6 +522,7 @@ function isApiKeySet(providerName, session = null, projectRoot = null) {
 		openrouter: 'OPENROUTER_API_KEY',
 		xai: 'XAI_API_KEY',
 		vertex: 'GOOGLE_API_KEY', // Vertex uses the same key as Google
+		'claude-code': 'CLAUDE_CODE_API_KEY', // Not actually used, but included for consistency
 		bedrock: 'AWS_ACCESS_KEY_ID' // Bedrock uses AWS credentials
 		// Add other providers as needed
 	};
@@ -601,6 +607,8 @@ function getMcpApiKeyStatus(providerName, projectRoot = null) {
 				break;
 			case 'ollama':
 				return true; // No key needed
+			case 'claude-code':
+				return true; // No key needed
 			case 'mistral':
 				apiKeyToCheck = mcpEnv.MISTRAL_API_KEY;
 				placeholderValue = 'YOUR_MISTRAL_API_KEY_HERE';
@@ -664,7 +672,8 @@ function getAvailableModels() {
 					provider: provider,
 					swe_score: sweScore,
 					cost_per_1m_tokens: cost,
-					allowed_roles: allowedRoles
+					allowed_roles: allowedRoles,
+					max_tokens: modelObj.max_tokens
 				});
 			});
 		} else {

scripts/modules/supported-models.json

@@ -610,5 +610,21 @@
 			"allowed_roles": ["main", "fallback"],
 			"max_tokens": 32768
 		}
+	],
+	"claude-code": [
+		{
+			"id": "opus",
+			"swe_score": 0.725,
+			"cost_per_1m_tokens": { "input": 0, "output": 0 },
+			"allowed_roles": ["main", "fallback", "research"],
+			"max_tokens": 32000
+		},
+		{
+			"id": "sonnet",
+			"swe_score": 0.727,
+			"cost_per_1m_tokens": { "input": 0, "output": 0 },
+			"allowed_roles": ["main", "fallback", "research"],
+			"max_tokens": 64000
+		}
 	]
 }

scripts/modules/task-manager/models.js

@@ -425,7 +425,7 @@ async function setModel(role, modelId, options = {}) {
 		let warningMessage = null;
 
 		// Find the model data in internal list initially to see if it exists at all
-		const modelData = availableModels.find((m) => m.id === modelId);
+		let modelData = availableModels.find((m) => m.id === modelId);
 
 		// --- Revised Logic: Prioritize providerHint --- //
 
@@ -495,6 +495,24 @@ async function setModel(role, modelId, options = {}) {
 					determinedProvider = CUSTOM_PROVIDERS.BEDROCK;
 					warningMessage = `Warning: Custom Bedrock model '${modelId}' set. Please ensure the model ID is valid and accessible in your AWS account.`;
 					report('warn', warningMessage);
+				} else if (providerHint === CUSTOM_PROVIDERS.CLAUDE_CODE) {
+					// Claude Code provider - check if model exists in our list
+					determinedProvider = CUSTOM_PROVIDERS.CLAUDE_CODE;
+					// Re-find modelData specifically for claude-code provider
+					const claudeCodeModels = availableModels.filter(
+						(m) => m.provider === 'claude-code'
+					);
+					const claudeCodeModelData = claudeCodeModels.find(
+						(m) => m.id === modelId
+					);
+					if (claudeCodeModelData) {
+						// Update modelData to the found claude-code model
+						modelData = claudeCodeModelData;
+						report('info', `Setting Claude Code model '${modelId}'.`);
+					} else {
+						warningMessage = `Warning: Claude Code model '${modelId}' not found in supported models. Setting without validation.`;
+						report('warn', warningMessage);
+					}
 				} else if (providerHint === CUSTOM_PROVIDERS.AZURE) {
 					// Set provider without model validation since Azure models are managed by Azure
 					determinedProvider = CUSTOM_PROVIDERS.AZURE;
@@ -547,11 +565,16 @@ async function setModel(role, modelId, options = {}) {
 
 		// Update configuration
 		currentConfig.models[role] = {
-			...currentConfig.models[role], // Keep existing params like maxTokens
+			...currentConfig.models[role], // Keep existing params like temperature
 			provider: determinedProvider,
 			modelId: modelId
 		};
 
+		// If model data is available, update maxTokens from supported-models.json
+		if (modelData && modelData.max_tokens) {
+			currentConfig.models[role].maxTokens = modelData.max_tokens;
+		}
+
 		// Write updated configuration
 		const writeResult = writeConfig(currentConfig, projectRoot);
 		if (!writeResult) {

scripts/modules/update-config-tokens.js

@@ -0,0 +1,53 @@
+/**
+ * update-config-tokens.js
+ * Updates config.json with correct maxTokens values from supported-models.json
+ */
+
+import fs from 'fs';
+import path from 'path';
+import { fileURLToPath } from 'url';
+import { dirname } from 'path';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+
+/**
+ * Updates the config file with correct maxTokens values from supported-models.json
+ * @param {string} configPath - Path to the config.json file to update
+ * @returns {boolean} True if successful, false otherwise
+ */
+export function updateConfigMaxTokens(configPath) {
+	try {
+		// Load supported models
+		const supportedModelsPath = path.join(__dirname, 'supported-models.json');
+		const supportedModels = JSON.parse(fs.readFileSync(supportedModelsPath, 'utf-8'));
+		
+		// Load config
+		const config = JSON.parse(fs.readFileSync(configPath, 'utf-8'));
+		
+		// Update each role's maxTokens if the model exists in supported-models.json
+		const roles = ['main', 'research', 'fallback'];
+		
+		for (const role of roles) {
+			if (config.models && config.models[role]) {
+				const provider = config.models[role].provider;
+				const modelId = config.models[role].modelId;
+				
+				// Find the model in supported models
+				if (supportedModels[provider]) {
+					const modelData = supportedModels[provider].find(m => m.id === modelId);
+					if (modelData && modelData.max_tokens) {
+						config.models[role].maxTokens = modelData.max_tokens;
+					}
+				}
+			}
+		}
+		
+		// Write back the updated config
+		fs.writeFileSync(configPath, JSON.stringify(config, null, 2));
+		return true;
+	} catch (error) {
+		console.error('Error updating config maxTokens:', error.message);
+		return false;
+	}
+}

src/ai-providers/claude-code.js

@@ -0,0 +1,47 @@
+/**
+ * src/ai-providers/claude-code.js
+ *
+ * Implementation for interacting with Claude models via Claude Code CLI
+ * using a custom AI SDK implementation.
+ */
+
+import { createClaudeCode } from './custom-sdk/claude-code/index.js';
+import { BaseAIProvider } from './base-provider.js';
+
+export class ClaudeCodeProvider extends BaseAIProvider {
+	constructor() {
+		super();
+		this.name = 'Claude Code';
+	}
+
+	/**
+	 * Override validateAuth to skip API key validation for Claude Code
+	 * @param {object} params - Parameters to validate
+	 */
+	validateAuth(params) {
+		// Claude Code doesn't require an API key
+		// No validation needed
+	}
+
+	/**
+	 * Creates and returns a Claude Code client instance.
+	 * @param {object} params - Parameters for client initialization
+	 * @param {string} [params.baseURL] - Optional custom API endpoint (not used by Claude Code)
+	 * @returns {Function} Claude Code client function
+	 * @throws {Error} If initialization fails
+	 */
+	getClient(params) {
+		try {
+			// Claude Code doesn't use API keys or base URLs
+			// Just return the provider factory
+			return createClaudeCode({
+				defaultSettings: {
+					// Add any default settings if needed
+					// These can be overridden per request
+				}
+			});
+		} catch (error) {
+			this.handleError('client initialization', error);
+		}
+	}
+}

src/ai-providers/custom-sdk/claude-code/errors.js

@@ -0,0 +1,126 @@
+/**
+ * @fileoverview Error handling utilities for Claude Code provider
+ */
+
+import { APICallError, LoadAPIKeyError } from '@ai-sdk/provider';
+
+/**
+ * @typedef {import('./types.js').ClaudeCodeErrorMetadata} ClaudeCodeErrorMetadata
+ */
+
+/**
+ * Create an API call error with Claude Code specific metadata
+ * @param {Object} params - Error parameters
+ * @param {string} params.message - Error message
+ * @param {string} [params.code] - Error code
+ * @param {number} [params.exitCode] - Process exit code
+ * @param {string} [params.stderr] - Standard error output
+ * @param {string} [params.promptExcerpt] - Excerpt of the prompt
+ * @param {boolean} [params.isRetryable=false] - Whether the error is retryable
+ * @returns {APICallError}
+ */
+export function createAPICallError({
+	message,
+	code,
+	exitCode,
+	stderr,
+	promptExcerpt,
+	isRetryable = false
+}) {
+	/** @type {ClaudeCodeErrorMetadata} */
+	const metadata = {
+		code,
+		exitCode,
+		stderr,
+		promptExcerpt
+	};
+
+	return new APICallError({
+		message,
+		isRetryable,
+		url: 'claude-code-cli://command',
+		requestBodyValues: promptExcerpt ? { prompt: promptExcerpt } : undefined,
+		data: metadata
+	});
+}
+
+/**
+ * Create an authentication error
+ * @param {Object} params - Error parameters
+ * @param {string} params.message - Error message
+ * @returns {LoadAPIKeyError}
+ */
+export function createAuthenticationError({ message }) {
+	return new LoadAPIKeyError({
+		message:
+			message ||
+			'Authentication failed. Please ensure Claude Code CLI is properly authenticated.'
+	});
+}
+
+/**
+ * Create a timeout error
+ * @param {Object} params - Error parameters
+ * @param {string} params.message - Error message
+ * @param {string} [params.promptExcerpt] - Excerpt of the prompt
+ * @param {number} params.timeoutMs - Timeout in milliseconds
+ * @returns {APICallError}
+ */
+export function createTimeoutError({ message, promptExcerpt, timeoutMs }) {
+	// Store timeoutMs in metadata for potential use by error handlers
+	/** @type {ClaudeCodeErrorMetadata & { timeoutMs: number }} */
+	const metadata = {
+		code: 'TIMEOUT',
+		promptExcerpt,
+		timeoutMs
+	};
+
+	return new APICallError({
+		message,
+		isRetryable: true,
+		url: 'claude-code-cli://command',
+		requestBodyValues: promptExcerpt ? { prompt: promptExcerpt } : undefined,
+		data: metadata
+	});
+}
+
+/**
+ * Check if an error is an authentication error
+ * @param {unknown} error - Error to check
+ * @returns {boolean}
+ */
+export function isAuthenticationError(error) {
+	if (error instanceof LoadAPIKeyError) return true;
+	if (
+		error instanceof APICallError &&
+		/** @type {ClaudeCodeErrorMetadata} */ (error.data)?.exitCode === 401
+	)
+		return true;
+	return false;
+}
+
+/**
+ * Check if an error is a timeout error
+ * @param {unknown} error - Error to check
+ * @returns {boolean}
+ */
+export function isTimeoutError(error) {
+	if (
+		error instanceof APICallError &&
+		/** @type {ClaudeCodeErrorMetadata} */ (error.data)?.code === 'TIMEOUT'
+	)
+		return true;
+	return false;
+}
+
+/**
+ * Get error metadata from an error
+ * @param {unknown} error - Error to extract metadata from
+ * @returns {ClaudeCodeErrorMetadata|undefined}
+ */
+export function getErrorMetadata(error) {
+	if (error instanceof APICallError && error.data) {
+		return /** @type {ClaudeCodeErrorMetadata} */ (error.data);
+	}
+	return undefined;
+}

src/ai-providers/custom-sdk/claude-code/index.js

@@ -0,0 +1,83 @@
+/**
+ * @fileoverview Claude Code provider factory and exports
+ */
+
+import { NoSuchModelError } from '@ai-sdk/provider';
+import { ClaudeCodeLanguageModel } from './language-model.js';
+
+/**
+ * @typedef {import('./types.js').ClaudeCodeSettings} ClaudeCodeSettings
+ * @typedef {import('./types.js').ClaudeCodeModelId} ClaudeCodeModelId
+ * @typedef {import('./types.js').ClaudeCodeProvider} ClaudeCodeProvider
+ * @typedef {import('./types.js').ClaudeCodeProviderSettings} ClaudeCodeProviderSettings
+ */
+
+/**
+ * Create a Claude Code provider using the official SDK
+ * @param {ClaudeCodeProviderSettings} [options={}] - Provider configuration options
+ * @returns {ClaudeCodeProvider} Claude Code provider instance
+ */
+export function createClaudeCode(options = {}) {
+	/**
+	 * Create a language model instance
+	 * @param {ClaudeCodeModelId} modelId - Model ID
+	 * @param {ClaudeCodeSettings} [settings={}] - Model settings
+	 * @returns {ClaudeCodeLanguageModel}
+	 */
+	const createModel = (modelId, settings = {}) => {
+		return new ClaudeCodeLanguageModel({
+			id: modelId,
+			settings: {
+				...options.defaultSettings,
+				...settings
+			}
+		});
+	};
+
+	/**
+	 * Provider function
+	 * @param {ClaudeCodeModelId} modelId - Model ID
+	 * @param {ClaudeCodeSettings} [settings] - Model settings
+	 * @returns {ClaudeCodeLanguageModel}
+	 */
+	const provider = function (modelId, settings) {
+		if (new.target) {
+			throw new Error(
+				'The Claude Code model function cannot be called with the new keyword.'
+			);
+		}
+
+		return createModel(modelId, settings);
+	};
+
+	provider.languageModel = createModel;
+	provider.chat = createModel; // Alias for languageModel
+
+	// Add textEmbeddingModel method that throws NoSuchModelError
+	provider.textEmbeddingModel = (modelId) => {
+		throw new NoSuchModelError({
+			modelId,
+			modelType: 'textEmbeddingModel'
+		});
+	};
+
+	return /** @type {ClaudeCodeProvider} */ (provider);
+}
+
+/**
+ * Default Claude Code provider instance
+ */
+export const claudeCode = createClaudeCode();
+
+// Provider exports
+export { ClaudeCodeLanguageModel } from './language-model.js';
+
+// Error handling exports
+export {
+	isAuthenticationError,
+	isTimeoutError,
+	getErrorMetadata,
+	createAPICallError,
+	createAuthenticationError,
+	createTimeoutError
+} from './errors.js';

src/ai-providers/custom-sdk/claude-code/json-extractor.js

@@ -0,0 +1,59 @@
+/**
+ * @fileoverview Extract JSON from Claude's response, handling markdown blocks and other formatting
+ */
+
+/**
+ * Extract JSON from Claude's response
+ * @param {string} text - The text to extract JSON from
+ * @returns {string} - The extracted JSON string
+ */
+export function extractJson(text) {
+	// Remove markdown code blocks if present
+	let jsonText = text.trim();
+
+	// Remove ```json blocks
+	jsonText = jsonText.replace(/^```json\s*/gm, '');
+	jsonText = jsonText.replace(/^```\s*/gm, '');
+	jsonText = jsonText.replace(/```\s*$/gm, '');
+
+	// Remove common TypeScript/JavaScript patterns
+	jsonText = jsonText.replace(/^const\s+\w+\s*=\s*/, ''); // Remove "const varName = "
+	jsonText = jsonText.replace(/^let\s+\w+\s*=\s*/, ''); // Remove "let varName = "
+	jsonText = jsonText.replace(/^var\s+\w+\s*=\s*/, ''); // Remove "var varName = "
+	jsonText = jsonText.replace(/;?\s*$/, ''); // Remove trailing semicolons
+
+	// Try to extract JSON object or array
+	const objectMatch = jsonText.match(/{[\s\S]*}/);
+	const arrayMatch = jsonText.match(/\[[\s\S]*\]/);
+
+	if (objectMatch) {
+		jsonText = objectMatch[0];
+	} else if (arrayMatch) {
+		jsonText = arrayMatch[0];
+	}
+
+	// First try to parse as valid JSON
+	try {
+		JSON.parse(jsonText);
+		return jsonText;
+	} catch {
+		// If it's not valid JSON, it might be a JavaScript object literal
+		// Try to convert it to valid JSON
+		try {
+			// This is a simple conversion that handles basic cases
+			// Replace unquoted keys with quoted keys
+			const converted = jsonText
+				.replace(/([{,]\s*)([a-zA-Z_$][a-zA-Z0-9_$]*)\s*:/g, '$1"$2":')
+				// Replace single quotes with double quotes
+				.replace(/'/g, '"');
+
+			// Validate the converted JSON
+			JSON.parse(converted);
+			return converted;
+		} catch {
+			// If all else fails, return the original text
+			// The AI SDK will handle the error appropriately
+			return text;
+		}
+	}
+}

src/ai-providers/custom-sdk/claude-code/language-model.js

@@ -0,0 +1,438 @@
+/**
+ * @fileoverview Claude Code Language Model implementation
+ */
+
+import { NoSuchModelError } from '@ai-sdk/provider';
+import { generateId } from '@ai-sdk/provider-utils';
+import { convertToClaudeCodeMessages } from './message-converter.js';
+import { extractJson } from './json-extractor.js';
+import { createAPICallError, createAuthenticationError } from './errors.js';
+import { query, AbortError } from '@anthropic-ai/claude-code';
+
+/**
+ * @typedef {import('./types.js').ClaudeCodeSettings} ClaudeCodeSettings
+ * @typedef {import('./types.js').ClaudeCodeModelId} ClaudeCodeModelId
+ * @typedef {import('./types.js').ClaudeCodeLanguageModelOptions} ClaudeCodeLanguageModelOptions
+ */
+
+const modelMap = {
+	opus: 'opus',
+	sonnet: 'sonnet'
+};
+
+export class ClaudeCodeLanguageModel {
+	specificationVersion = 'v1';
+	defaultObjectGenerationMode = 'json';
+	supportsImageUrls = false;
+	supportsStructuredOutputs = false;
+
+	/** @type {ClaudeCodeModelId} */
+	modelId;
+
+	/** @type {ClaudeCodeSettings} */
+	settings;
+
+	/** @type {string|undefined} */
+	sessionId;
+
+	/**
+	 * @param {ClaudeCodeLanguageModelOptions} options
+	 */
+	constructor(options) {
+		this.modelId = options.id;
+		this.settings = options.settings ?? {};
+
+		// Validate model ID format
+		if (
+			!this.modelId ||
+			typeof this.modelId !== 'string' ||
+			this.modelId.trim() === ''
+		) {
+			throw new NoSuchModelError({
+				modelId: this.modelId,
+				modelType: 'languageModel'
+			});
+		}
+	}
+
+	get provider() {
+		return 'claude-code';
+	}
+
+	/**
+	 * Get the model name for Claude Code CLI
+	 * @returns {string}
+	 */
+	getModel() {
+		const mapped = modelMap[this.modelId];
+		return mapped ?? this.modelId;
+	}
+
+	/**
+	 * Generate unsupported parameter warnings
+	 * @param {Object} options - Generation options
+	 * @returns {Array} Warnings array
+	 */
+	generateUnsupportedWarnings(options) {
+		const warnings = [];
+		const unsupportedParams = [];
+
+		// Check for unsupported parameters
+		if (options.temperature !== undefined) unsupportedParams.push('temperature');
+		if (options.maxTokens !== undefined) unsupportedParams.push('maxTokens');
+		if (options.topP !== undefined) unsupportedParams.push('topP');
+		if (options.topK !== undefined) unsupportedParams.push('topK');
+		if (options.presencePenalty !== undefined)
+			unsupportedParams.push('presencePenalty');
+		if (options.frequencyPenalty !== undefined)
+			unsupportedParams.push('frequencyPenalty');
+		if (options.stopSequences !== undefined && options.stopSequences.length > 0)
+			unsupportedParams.push('stopSequences');
+		if (options.seed !== undefined) unsupportedParams.push('seed');
+
+		if (unsupportedParams.length > 0) {
+			// Add a warning for each unsupported parameter
+			for (const param of unsupportedParams) {
+				warnings.push({
+					type: 'unsupported-setting',
+					setting: param,
+					details: `Claude Code CLI does not support the ${param} parameter. It will be ignored.`
+				});
+			}
+		}
+
+		return warnings;
+	}
+
+	/**
+	 * Generate text using Claude Code
+	 * @param {Object} options - Generation options
+	 * @returns {Promise<Object>}
+	 */
+	async doGenerate(options) {
+		const { messagesPrompt } = convertToClaudeCodeMessages(
+			options.prompt,
+			options.mode
+		);
+
+		const abortController = new AbortController();
+		if (options.abortSignal) {
+			options.abortSignal.addEventListener('abort', () =>
+				abortController.abort()
+			);
+		}
+
+		const queryOptions = {
+			model: this.getModel(),
+			abortController,
+			resume: this.sessionId,
+			pathToClaudeCodeExecutable: this.settings.pathToClaudeCodeExecutable,
+			customSystemPrompt: this.settings.customSystemPrompt,
+			appendSystemPrompt: this.settings.appendSystemPrompt,
+			maxTurns: this.settings.maxTurns,
+			maxThinkingTokens: this.settings.maxThinkingTokens,
+			cwd: this.settings.cwd,
+			executable: this.settings.executable,
+			executableArgs: this.settings.executableArgs,
+			permissionMode: this.settings.permissionMode,
+			permissionPromptToolName: this.settings.permissionPromptToolName,
+			continue: this.settings.continue,
+			allowedTools: this.settings.allowedTools,
+			disallowedTools: this.settings.disallowedTools,
+			mcpServers: this.settings.mcpServers
+		};
+
+		let text = '';
+		let usage = { promptTokens: 0, completionTokens: 0 };
+		let finishReason = 'stop';
+		let costUsd;
+		let durationMs;
+		let rawUsage;
+		const warnings = this.generateUnsupportedWarnings(options);
+
+		try {
+			const response = query({
+				prompt: messagesPrompt,
+				options: queryOptions
+			});
+
+			for await (const message of response) {
+				if (message.type === 'assistant') {
+					text += message.message.content
+						.map((c) => (c.type === 'text' ? c.text : ''))
+						.join('');
+				} else if (message.type === 'result') {
+					this.sessionId = message.session_id;
+					costUsd = message.total_cost_usd;
+					durationMs = message.duration_ms;
+
+					if ('usage' in message) {
+						rawUsage = message.usage;
+						usage = {
+							promptTokens:
+								(message.usage.cache_creation_input_tokens ?? 0) +
+								(message.usage.cache_read_input_tokens ?? 0) +
+								(message.usage.input_tokens ?? 0),
+							completionTokens: message.usage.output_tokens ?? 0
+						};
+					}
+
+					if (message.subtype === 'error_max_turns') {
+						finishReason = 'length';
+					} else if (message.subtype === 'error_during_execution') {
+						finishReason = 'error';
+					}
+				} else if (message.type === 'system' && message.subtype === 'init') {
+					this.sessionId = message.session_id;
+				}
+			}
+		} catch (error) {
+			if (error instanceof AbortError) {
+				throw options.abortSignal?.aborted
+					? options.abortSignal.reason
+					: error;
+			}
+
+			// Check for authentication errors
+			if (
+				error.message?.includes('not logged in') ||
+				error.message?.includes('authentication') ||
+				error.exitCode === 401
+			) {
+				throw createAuthenticationError({
+					message:
+						error.message ||
+						'Authentication failed. Please ensure Claude Code CLI is properly authenticated.'
+				});
+			}
+
+			// Wrap other errors with API call error
+			throw createAPICallError({
+				message: error.message || 'Claude Code CLI error',
+				code: error.code,
+				exitCode: error.exitCode,
+				stderr: error.stderr,
+				promptExcerpt: messagesPrompt.substring(0, 200),
+				isRetryable: error.code === 'ENOENT' || error.code === 'ECONNREFUSED'
+			});
+		}
+
+		// Extract JSON if in object-json mode
+		if (options.mode?.type === 'object-json' && text) {
+			text = extractJson(text);
+		}
+
+		return {
+			text: text || undefined,
+			usage,
+			finishReason,
+			rawCall: {
+				rawPrompt: messagesPrompt,
+				rawSettings: queryOptions
+			},
+			warnings: warnings.length > 0 ? warnings : undefined,
+			response: {
+				id: generateId(),
+				timestamp: new Date(),
+				modelId: this.modelId
+			},
+			request: {
+				body: messagesPrompt
+			},
+			providerMetadata: {
+				'claude-code': {
+					...(this.sessionId !== undefined && { sessionId: this.sessionId }),
+					...(costUsd !== undefined && { costUsd }),
+					...(durationMs !== undefined && { durationMs }),
+					...(rawUsage !== undefined && { rawUsage })
+				}
+			}
+		};
+	}
+
+	/**
+	 * Stream text using Claude Code
+	 * @param {Object} options - Stream options
+	 * @returns {Promise<Object>}
+	 */
+	async doStream(options) {
+		const { messagesPrompt } = convertToClaudeCodeMessages(
+			options.prompt,
+			options.mode
+		);
+
+		const abortController = new AbortController();
+		if (options.abortSignal) {
+			options.abortSignal.addEventListener('abort', () =>
+				abortController.abort()
+			);
+		}
+
+		const queryOptions = {
+			model: this.getModel(),
+			abortController,
+			resume: this.sessionId,
+			pathToClaudeCodeExecutable: this.settings.pathToClaudeCodeExecutable,
+			customSystemPrompt: this.settings.customSystemPrompt,
+			appendSystemPrompt: this.settings.appendSystemPrompt,
+			maxTurns: this.settings.maxTurns,
+			maxThinkingTokens: this.settings.maxThinkingTokens,
+			cwd: this.settings.cwd,
+			executable: this.settings.executable,
+			executableArgs: this.settings.executableArgs,
+			permissionMode: this.settings.permissionMode,
+			permissionPromptToolName: this.settings.permissionPromptToolName,
+			continue: this.settings.continue,
+			allowedTools: this.settings.allowedTools,
+			disallowedTools: this.settings.disallowedTools,
+			mcpServers: this.settings.mcpServers
+		};
+
+		const warnings = this.generateUnsupportedWarnings(options);
+
+		const stream = new ReadableStream({
+			start: async (controller) => {
+				try {
+					const response = query({
+						prompt: messagesPrompt,
+						options: queryOptions
+					});
+
+					let usage = { promptTokens: 0, completionTokens: 0 };
+					let accumulatedText = '';
+
+					for await (const message of response) {
+						if (message.type === 'assistant') {
+							const text = message.message.content
+								.map((c) => (c.type === 'text' ? c.text : ''))
+								.join('');
+
+							if (text) {
+								accumulatedText += text;
+
+								// In object-json mode, we need to accumulate the full text
+								// and extract JSON at the end, so don't stream individual deltas
+								if (options.mode?.type !== 'object-json') {
+									controller.enqueue({
+										type: 'text-delta',
+										textDelta: text
+									});
+								}
+							}
+						} else if (message.type === 'result') {
+							let rawUsage;
+							if ('usage' in message) {
+								rawUsage = message.usage;
+								usage = {
+									promptTokens:
+										(message.usage.cache_creation_input_tokens ?? 0) +
+										(message.usage.cache_read_input_tokens ?? 0) +
+										(message.usage.input_tokens ?? 0),
+									completionTokens: message.usage.output_tokens ?? 0
+								};
+							}
+
+							let finishReason = 'stop';
+							if (message.subtype === 'error_max_turns') {
+								finishReason = 'length';
+							} else if (message.subtype === 'error_during_execution') {
+								finishReason = 'error';
+							}
+
+							// Store session ID in the model instance
+							this.sessionId = message.session_id;
+
+							// In object-json mode, extract JSON and send the full text at once
+							if (options.mode?.type === 'object-json' && accumulatedText) {
+								const extractedJson = extractJson(accumulatedText);
+								controller.enqueue({
+									type: 'text-delta',
+									textDelta: extractedJson
+								});
+							}
+
+							controller.enqueue({
+								type: 'finish',
+								finishReason,
+								usage,
+								providerMetadata: {
+									'claude-code': {
+										sessionId: message.session_id,
+										...(message.total_cost_usd !== undefined && {
+											costUsd: message.total_cost_usd
+										}),
+										...(message.duration_ms !== undefined && {
+											durationMs: message.duration_ms
+										}),
+										...(rawUsage !== undefined && { rawUsage })
+									}
+								}
+							});
+						} else if (message.type === 'system' && message.subtype === 'init') {
+							// Store session ID for future use
+							this.sessionId = message.session_id;
+
+							// Emit response metadata when session is initialized
+							controller.enqueue({
+								type: 'response-metadata',
+								id: message.session_id,
+								timestamp: new Date(),
+								modelId: this.modelId
+							});
+						}
+					}
+
+					controller.close();
+				} catch (error) {
+					let errorToEmit;
+
+					if (error instanceof AbortError) {
+						errorToEmit = options.abortSignal?.aborted
+							? options.abortSignal.reason
+							: error;
+					} else if (
+						error.message?.includes('not logged in') ||
+						error.message?.includes('authentication') ||
+						error.exitCode === 401
+					) {
+						errorToEmit = createAuthenticationError({
+							message:
+								error.message ||
+								'Authentication failed. Please ensure Claude Code CLI is properly authenticated.'
+						});
+					} else {
+						errorToEmit = createAPICallError({
+							message: error.message || 'Claude Code CLI error',
+							code: error.code,
+							exitCode: error.exitCode,
+							stderr: error.stderr,
+							promptExcerpt: messagesPrompt.substring(0, 200),
+							isRetryable:
+								error.code === 'ENOENT' || error.code === 'ECONNREFUSED'
+						});
+					}
+
+					// Emit error as a stream part
+					controller.enqueue({
+						type: 'error',
+						error: errorToEmit
+					});
+
+					controller.close();
+				}
+			}
+		});
+
+		return {
+			stream,
+			rawCall: {
+				rawPrompt: messagesPrompt,
+				rawSettings: queryOptions
+			},
+			warnings: warnings.length > 0 ? warnings : undefined,
+			request: {
+				body: messagesPrompt
+			}
+		};
+	}
+}

src/ai-providers/custom-sdk/claude-code/message-converter.js

@@ -0,0 +1,139 @@
+/**
+ * @fileoverview Converts AI SDK prompt format to Claude Code message format
+ */
+
+/**
+ * Convert AI SDK prompt to Claude Code messages format
+ * @param {Array} prompt - AI SDK prompt array
+ * @param {Object} [mode] - Generation mode
+ * @param {string} mode.type - Mode type ('regular', 'object-json', 'object-tool')
+ * @returns {{messagesPrompt: string, systemPrompt?: string}}
+ */
+export function convertToClaudeCodeMessages(prompt, mode) {
+	const messages = [];
+	let systemPrompt;
+
+	for (const message of prompt) {
+		switch (message.role) {
+			case 'system':
+				systemPrompt = message.content;
+				break;
+
+			case 'user':
+				if (typeof message.content === 'string') {
+					messages.push(message.content);
+				} else {
+					// Handle multi-part content
+					const textParts = message.content
+						.filter((part) => part.type === 'text')
+						.map((part) => part.text)
+						.join('\n');
+
+					if (textParts) {
+						messages.push(textParts);
+					}
+
+					// Note: Image parts are not supported by Claude Code CLI
+					const imageParts = message.content.filter(
+						(part) => part.type === 'image'
+					);
+					if (imageParts.length > 0) {
+						console.warn(
+							'Claude Code CLI does not support image inputs. Images will be ignored.'
+						);
+					}
+				}
+				break;
+
+			case 'assistant':
+				if (typeof message.content === 'string') {
+					messages.push(`Assistant: ${message.content}`);
+				} else {
+					const textParts = message.content
+						.filter((part) => part.type === 'text')
+						.map((part) => part.text)
+						.join('\n');
+
+					if (textParts) {
+						messages.push(`Assistant: ${textParts}`);
+					}
+
+					// Handle tool calls if present
+					const toolCalls = message.content.filter(
+						(part) => part.type === 'tool-call'
+					);
+					if (toolCalls.length > 0) {
+						// For now, we'll just note that tool calls were made
+						messages.push(`Assistant: [Tool calls made]`);
+					}
+				}
+				break;
+
+			case 'tool':
+				// Tool results could be included in the conversation
+				messages.push(
+					`Tool Result (${message.content[0].toolName}): ${JSON.stringify(
+						message.content[0].result
+					)}`
+				);
+				break;
+		}
+	}
+
+	// For the SDK, we need to provide a single prompt string
+	// Format the conversation history properly
+
+	// Combine system prompt with messages
+	let finalPrompt = '';
+
+	// Add system prompt at the beginning if present
+	if (systemPrompt) {
+		finalPrompt = systemPrompt;
+	}
+
+	if (messages.length === 0) {
+		return { messagesPrompt: finalPrompt, systemPrompt };
+	}
+
+	// Format messages
+	const formattedMessages = [];
+	for (let i = 0; i < messages.length; i++) {
+		const msg = messages[i];
+		// Check if this is a user or assistant message based on content
+		if (msg.startsWith('Assistant:') || msg.startsWith('Tool Result')) {
+			formattedMessages.push(msg);
+		} else {
+			// User messages
+			formattedMessages.push(`Human: ${msg}`);
+		}
+	}
+
+	// Combine system prompt with messages
+	if (finalPrompt) {
+		finalPrompt = finalPrompt + '\n\n' + formattedMessages.join('\n\n');
+	} else {
+		finalPrompt = formattedMessages.join('\n\n');
+	}
+
+	// For JSON mode, add explicit instruction to ensure JSON output
+	if (mode?.type === 'object-json') {
+		// Make the JSON instruction even more explicit
+		finalPrompt = `${finalPrompt}
+
+CRITICAL INSTRUCTION: You MUST respond with ONLY valid JSON. Follow these rules EXACTLY:
+1. Start your response with an opening brace {
+2. End your response with a closing brace }
+3. Do NOT include any text before the opening brace
+4. Do NOT include any text after the closing brace
+5. Do NOT use markdown code blocks or backticks
+6. Do NOT include explanations or commentary
+7. The ENTIRE response must be valid JSON that can be parsed with JSON.parse()
+
+Begin your response with { and end with }`;
+	}
+
+	return {
+		messagesPrompt: finalPrompt,
+		systemPrompt
+	};
+}

src/ai-providers/custom-sdk/claude-code/types.js

@@ -0,0 +1,73 @@
+/**
+ * @fileoverview Type definitions for Claude Code AI SDK provider
+ * These JSDoc types mirror the TypeScript interfaces from the original provider
+ */
+
+/**
+ * Claude Code provider settings
+ * @typedef {Object} ClaudeCodeSettings
+ * @property {string} [pathToClaudeCodeExecutable='claude'] - Custom path to Claude Code CLI executable
+ * @property {string} [customSystemPrompt] - Custom system prompt to use
+ * @property {string} [appendSystemPrompt] - Append additional content to the system prompt
+ * @property {number} [maxTurns] - Maximum number of turns for the conversation
+ * @property {number} [maxThinkingTokens] - Maximum thinking tokens for the model
+ * @property {string} [cwd] - Working directory for CLI operations
+ * @property {'bun'|'deno'|'node'} [executable='node'] - JavaScript runtime to use
+ * @property {string[]} [executableArgs] - Additional arguments for the JavaScript runtime
+ * @property {'default'|'acceptEdits'|'bypassPermissions'|'plan'} [permissionMode='default'] - Permission mode for tool usage
+ * @property {string} [permissionPromptToolName] - Custom tool name for permission prompts
+ * @property {boolean} [continue] - Continue the most recent conversation
+ * @property {string} [resume] - Resume a specific session by ID
+ * @property {string[]} [allowedTools] - Tools to explicitly allow during execution (e.g., ['Read', 'LS', 'Bash(git log:*)'])
+ * @property {string[]} [disallowedTools] - Tools to disallow during execution (e.g., ['Write', 'Edit', 'Bash(rm:*)'])
+ * @property {Object.<string, MCPServerConfig>} [mcpServers] - MCP server configuration
+ * @property {boolean} [verbose] - Enable verbose logging for debugging
+ */
+
+/**
+ * MCP Server configuration
+ * @typedef {Object} MCPServerConfig
+ * @property {'stdio'|'sse'} [type='stdio'] - Server type
+ * @property {string} command - Command to execute (for stdio type)
+ * @property {string[]} [args] - Arguments for the command
+ * @property {Object.<string, string>} [env] - Environment variables
+ * @property {string} url - URL for SSE type servers
+ * @property {Object.<string, string>} [headers] - Headers for SSE type servers
+ */
+
+/**
+ * Model ID type - either 'opus', 'sonnet', or any string
+ * @typedef {'opus'|'sonnet'|string} ClaudeCodeModelId
+ */
+
+/**
+ * Language model options
+ * @typedef {Object} ClaudeCodeLanguageModelOptions
+ * @property {ClaudeCodeModelId} id - The model ID
+ * @property {ClaudeCodeSettings} [settings] - Optional settings
+ */
+
+/**
+ * Error metadata for Claude Code errors
+ * @typedef {Object} ClaudeCodeErrorMetadata
+ * @property {string} [code] - Error code
+ * @property {number} [exitCode] - Process exit code
+ * @property {string} [stderr] - Standard error output
+ * @property {string} [promptExcerpt] - Excerpt of the prompt that caused the error
+ */
+
+/**
+ * Claude Code provider interface
+ * @typedef {Object} ClaudeCodeProvider
+ * @property {function(ClaudeCodeModelId, ClaudeCodeSettings=): Object} languageModel - Create a language model
+ * @property {function(ClaudeCodeModelId, ClaudeCodeSettings=): Object} chat - Alias for languageModel
+ * @property {function(string): never} textEmbeddingModel - Throws NoSuchModelError (not supported)
+ */
+
+/**
+ * Claude Code provider settings
+ * @typedef {Object} ClaudeCodeProviderSettings
+ * @property {ClaudeCodeSettings} [defaultSettings] - Default settings to use for all models
+ */
+
+export {}; // This ensures the file is treated as a module

src/ai-providers/index.js

@@ -13,3 +13,4 @@ export { OllamaAIProvider } from './ollama.js';
 export { BedrockAIProvider } from './bedrock.js';
 export { AzureProvider } from './azure.js';
 export { VertexAIProvider } from './google-vertex.js';
+export { ClaudeCodeProvider } from './claude-code.js';

src/constants/providers.js

@@ -19,7 +19,8 @@ export const CUSTOM_PROVIDERS = {
 	VERTEX: 'vertex',
 	BEDROCK: 'bedrock',
 	OPENROUTER: 'openrouter',
-	OLLAMA: 'ollama'
+	OLLAMA: 'ollama',
+	CLAUDE_CODE: 'claude-code'
 };
 
 // Custom providers array (for backward compatibility and iteration)

tests/unit/ai-services-unified.test.js

@@ -180,6 +180,11 @@ jest.unstable_mockModule('../../src/ai-providers/index.js', () => ({
 		generateText: jest.fn(),
 		streamText: jest.fn(),
 		generateObject: jest.fn()
+	})),
+	ClaudeCodeProvider: jest.fn(() => ({
+		generateText: jest.fn(),
+		streamText: jest.fn(),
+		generateObject: jest.fn()
 	}))
 }));