feat: add skills and subagents configuration support

- Updated .gitignore to include skills directory.
- Introduced agent discovery functionality to scan for AGENT.md files in user and project directories.
- Added new API endpoint for discovering filesystem agents.
- Implemented UI components for managing skills and viewing custom subagents.
- Enhanced settings helpers to retrieve skills configuration and custom subagents.
- Updated agent service to incorporate skills and subagents in task delegation.

These changes enhance the capabilities of the system by allowing users to define and manage skills and custom subagents effectively.

apps/server/src/services/agent-service.ts

@@ -24,6 +24,8 @@ import {
   filterClaudeMdFromContext,
   getMCPServersFromSettings,
   getPromptCustomization,
+  getSkillsConfiguration,
+  getCustomSubagents,
 } from '../lib/settings-helpers.js';
 
 interface Message {
@@ -241,6 +243,16 @@ export class AgentService {
       // Load MCP servers from settings (global setting only)
       const mcpServers = await getMCPServersFromSettings(this.settingsService, '[AgentService]');
 
+      // Get Skills configuration from settings
+      const skillsConfig = this.settingsService
+        ? await getSkillsConfiguration(this.settingsService)
+        : { enabled: false, sources: [] as Array<'user' | 'project'>, shouldIncludeInTools: false };
+
+      // Get custom subagents from settings (merge global + project-level)
+      const customSubagents = this.settingsService
+        ? await getCustomSubagents(this.settingsService, effectiveWorkDir)
+        : undefined;
+
       // Load project context files (CLAUDE.md, CODE_QUALITY.md, etc.)
       const contextResult = await loadContextFiles({
         projectPath: effectiveWorkDir,
@@ -275,7 +287,44 @@ export class AgentService {
       // Extract model, maxTurns, and allowedTools from SDK options
       const effectiveModel = sdkOptions.model!;
       const maxTurns = sdkOptions.maxTurns;
-      const allowedTools = sdkOptions.allowedTools as string[] | undefined;
+      let allowedTools = sdkOptions.allowedTools as string[] | undefined;
+
+      // Build merged settingSources array (filter to only 'user' and 'project')
+      const settingSources: Array<'user' | 'project'> = [];
+      if (sdkOptions.settingSources) {
+        sdkOptions.settingSources.forEach((source) => {
+          if (source === 'user' || source === 'project') {
+            if (!settingSources.includes(source)) {
+              settingSources.push(source);
+            }
+          }
+        });
+      }
+      // Merge skills sources (avoid duplicates)
+      if (skillsConfig.enabled && skillsConfig.sources.length > 0) {
+        skillsConfig.sources.forEach((source) => {
+          if (!settingSources.includes(source)) {
+            settingSources.push(source);
+          }
+        });
+      }
+
+      // Enhance allowedTools with Skills and Subagents tools
+      if (allowedTools) {
+        allowedTools = [...allowedTools]; // Create a copy to avoid mutating SDK options
+        // Add Skill tool if skills are enabled
+        if (skillsConfig.shouldIncludeInTools && !allowedTools.includes('Skill')) {
+          allowedTools.push('Skill');
+        }
+        // Add Task tool if custom subagents are configured
+        if (
+          customSubagents &&
+          Object.keys(customSubagents).length > 0 &&
+          !allowedTools.includes('Task')
+        ) {
+          allowedTools.push('Task');
+        }
+      }
 
       // Get provider for this model
       const provider = ProviderFactory.getProviderForModel(effectiveModel);
@@ -290,10 +339,11 @@ export class AgentService {
         allowedTools: allowedTools,
         abortController: session.abortController!,
         conversationHistory: conversationHistory.length > 0 ? conversationHistory : undefined,
-        settingSources: sdkOptions.settingSources,
+        settingSources: settingSources.length > 0 ? settingSources : undefined,
         sandbox: sdkOptions.sandbox, // Pass sandbox configuration
         sdkSessionId: session.sdkSessionId, // Pass SDK session ID for resuming
         mcpServers: Object.keys(mcpServers).length > 0 ? mcpServers : undefined, // Pass MCP servers configuration
+        agents: customSubagents, // Pass custom subagents for task delegation
       };
 
       // Build prompt content with images