feat: enhance SDK options with thinking level support

- Introduced a new function, buildThinkingOptions, to handle the conversion of ThinkingLevel to maxThinkingTokens for the Claude SDK.
- Updated existing SDK option creation functions to incorporate thinking options, ensuring that maxThinkingTokens are included based on the specified thinking level.
- Enhanced the settings service to support migration of phase models to include thinking levels, improving compatibility with new configurations.
- Added comprehensive tests for thinking level integration and migration logic, ensuring robust functionality across the application.

This update significantly improves the SDK's configurability and performance by allowing for more nuanced control over reasoning capabilities.

apps/server/src/lib/sdk-options.ts

@@ -19,7 +19,13 @@ import type { Options } from '@anthropic-ai/claude-agent-sdk';
 import os from 'os';
 import path from 'path';
 import { resolveModelString } from '@automaker/model-resolver';
-import { DEFAULT_MODELS, CLAUDE_MODEL_MAP, type McpServerConfig } from '@automaker/types';
+import {
+  DEFAULT_MODELS,
+  CLAUDE_MODEL_MAP,
+  type McpServerConfig,
+  type ThinkingLevel,
+  getThinkingTokenBudget,
+} from '@automaker/types';
 import { isPathAllowed, PathNotAllowedError, getAllowedRootDirectory } from '@automaker/platform';
 
 /**
@@ -317,6 +323,21 @@ function buildMcpOptions(config: CreateSdkOptionsConfig): McpPermissionOptions {
   };
 }
 
+/**
+ * Build thinking options for SDK configuration.
+ * Converts ThinkingLevel to maxThinkingTokens for the Claude SDK.
+ *
+ * @param thinkingLevel - The thinking level to convert
+ * @returns Object with maxThinkingTokens if thinking is enabled
+ */
+function buildThinkingOptions(thinkingLevel?: ThinkingLevel): Partial<Options> {
+  const maxThinkingTokens = getThinkingTokenBudget(thinkingLevel);
+  console.log(
+    `[SDK-Options] buildThinkingOptions: thinkingLevel="${thinkingLevel}" -> maxThinkingTokens=${maxThinkingTokens}`
+  );
+  return maxThinkingTokens ? { maxThinkingTokens } : {};
+}
+
 /**
  * Build system prompt configuration based on autoLoadClaudeMd setting.
  * When autoLoadClaudeMd is true:
@@ -409,6 +430,9 @@ export interface CreateSdkOptionsConfig {
 
   /** Allow unrestricted tools when MCP servers are enabled */
   mcpUnrestrictedTools?: boolean;
+
+  /** Extended thinking level for Claude models */
+  thinkingLevel?: ThinkingLevel;
 }
 
 // Re-export MCP types from @automaker/types for convenience
@@ -435,6 +459,9 @@ export function createSpecGenerationOptions(config: CreateSdkOptionsConfig): Opt
   // Build CLAUDE.md auto-loading options if enabled
   const claudeMdOptions = buildClaudeMdOptions(config);
 
+  // Build thinking options
+  const thinkingOptions = buildThinkingOptions(config.thinkingLevel);
+
   return {
     ...getBaseOptions(),
     // Override permissionMode - spec generation only needs read-only tools
@@ -446,6 +473,7 @@ export function createSpecGenerationOptions(config: CreateSdkOptionsConfig): Opt
     cwd: config.cwd,
     allowedTools: [...TOOL_PRESETS.specGeneration],
     ...claudeMdOptions,
+    ...thinkingOptions,
     ...(config.abortController && { abortController: config.abortController }),
     ...(config.outputFormat && { outputFormat: config.outputFormat }),
   };
@@ -467,6 +495,9 @@ export function createFeatureGenerationOptions(config: CreateSdkOptionsConfig):
   // Build CLAUDE.md auto-loading options if enabled
   const claudeMdOptions = buildClaudeMdOptions(config);
 
+  // Build thinking options
+  const thinkingOptions = buildThinkingOptions(config.thinkingLevel);
+
   return {
     ...getBaseOptions(),
     // Override permissionMode - feature generation only needs read-only tools
@@ -476,6 +507,7 @@ export function createFeatureGenerationOptions(config: CreateSdkOptionsConfig):
     cwd: config.cwd,
     allowedTools: [...TOOL_PRESETS.readOnly],
     ...claudeMdOptions,
+    ...thinkingOptions,
     ...(config.abortController && { abortController: config.abortController }),
   };
 }
@@ -496,6 +528,9 @@ export function createSuggestionsOptions(config: CreateSdkOptionsConfig): Option
   // Build CLAUDE.md auto-loading options if enabled
   const claudeMdOptions = buildClaudeMdOptions(config);
 
+  // Build thinking options
+  const thinkingOptions = buildThinkingOptions(config.thinkingLevel);
+
   return {
     ...getBaseOptions(),
     model: getModelForUseCase('suggestions', config.model),
@@ -503,6 +538,7 @@ export function createSuggestionsOptions(config: CreateSdkOptionsConfig): Option
     cwd: config.cwd,
     allowedTools: [...TOOL_PRESETS.readOnly],
     ...claudeMdOptions,
+    ...thinkingOptions,
     ...(config.abortController && { abortController: config.abortController }),
     ...(config.outputFormat && { outputFormat: config.outputFormat }),
   };
@@ -531,6 +567,9 @@ export function createChatOptions(config: CreateSdkOptionsConfig): Options {
   // Build MCP-related options
   const mcpOptions = buildMcpOptions(config);
 
+  // Build thinking options
+  const thinkingOptions = buildThinkingOptions(config.thinkingLevel);
+
   // Check sandbox compatibility (auto-disables for cloud storage paths)
   const sandboxCheck = checkSandboxCompatibility(config.cwd, config.enableSandboxMode);
 
@@ -550,6 +589,7 @@ export function createChatOptions(config: CreateSdkOptionsConfig): Options {
       },
     }),
     ...claudeMdOptions,
+    ...thinkingOptions,
     ...(config.abortController && { abortController: config.abortController }),
     ...mcpOptions.mcpServerOptions,
   };
@@ -575,6 +615,9 @@ export function createAutoModeOptions(config: CreateSdkOptionsConfig): Options {
   // Build MCP-related options
   const mcpOptions = buildMcpOptions(config);
 
+  // Build thinking options
+  const thinkingOptions = buildThinkingOptions(config.thinkingLevel);
+
   // Check sandbox compatibility (auto-disables for cloud storage paths)
   const sandboxCheck = checkSandboxCompatibility(config.cwd, config.enableSandboxMode);
 
@@ -594,6 +637,7 @@ export function createAutoModeOptions(config: CreateSdkOptionsConfig): Options {
       },
     }),
     ...claudeMdOptions,
+    ...thinkingOptions,
     ...(config.abortController && { abortController: config.abortController }),
     ...mcpOptions.mcpServerOptions,
   };
@@ -621,6 +665,9 @@ export function createCustomOptions(
   // Build MCP-related options
   const mcpOptions = buildMcpOptions(config);
 
+  // Build thinking options
+  const thinkingOptions = buildThinkingOptions(config.thinkingLevel);
+
   // For custom options: use explicit allowedTools if provided, otherwise use preset based on MCP settings
   const effectiveAllowedTools = config.allowedTools
     ? [...config.allowedTools]
@@ -638,6 +685,7 @@ export function createCustomOptions(
     // Apply MCP bypass options if configured
     ...mcpOptions.bypassOptions,
     ...claudeMdOptions,
+    ...thinkingOptions,
     ...(config.abortController && { abortController: config.abortController }),
     ...mcpOptions.mcpServerOptions,
   };