feat(agents): enhance error messages for agent and session operations; update accessible paths handling

src/main/apiServer/routes/agents/handlers/agents.ts

@@ -71,7 +71,7 @@ export const createAgent = async (req: Request, res: Response): Promise<Response
     logger.error('Error creating agent:', error)
     return res.status(500).json({
       error: {
-        message: 'Failed to create agent',
+        message: `Failed to create agent: ${error.message}`,
         type: 'internal_error',
         code: 'agent_creation_failed'
       }
@@ -315,7 +315,7 @@ export const updateAgent = async (req: Request, res: Response): Promise<Response
     logger.error('Error updating agent:', error)
     return res.status(500).json({
       error: {
-        message: 'Failed to update agent',
+        message: 'Failed to update agent: ' + error.message,
         type: 'internal_error',
         code: 'agent_update_failed'
       }
@@ -461,7 +461,7 @@ export const patchAgent = async (req: Request, res: Response): Promise<Response>
     logger.error('Error partially updating agent:', error)
     return res.status(500).json({
       error: {
-        message: 'Failed to partially update agent',
+        message: `Failed to partially update agent: ${error.message}`,
         type: 'internal_error',
         code: 'agent_patch_failed'
       }

src/main/apiServer/routes/agents/handlers/sessions.ts

@@ -51,7 +51,7 @@ export const createSession = async (req: Request, res: Response): Promise<Respon
     logger.error('Error creating session:', error)
     return res.status(500).json({
       error: {
-        message: 'Failed to create session',
+        message: `Failed to create session: ${error.message}`,
         type: 'internal_error',
         code: 'session_creation_failed'
       }
@@ -195,7 +195,7 @@ export const updateSession = async (req: Request, res: Response): Promise<Respon
     logger.error('Error updating session:', error)
     return res.status(500).json({
       error: {
-        message: 'Failed to update session',
+        message: `Failed to update session: ${error.message}`,
         type: 'internal_error',
         code: 'session_update_failed'
       }
@@ -254,7 +254,7 @@ export const patchSession = async (req: Request, res: Response): Promise<Respons
     logger.error('Error patching session:', error)
     return res.status(500).json({
       error: {
-        message: 'Failed to patch session',
+        message: `Failed to patch session, ${error.message}`,
         type: 'internal_error',
         code: 'session_patch_failed'
       }

src/main/services/agents/BaseService.ts

@@ -163,20 +163,36 @@ export abstract class BaseService {
     return deserialized
   }
 
-  protected ensurePathsExist(paths?: string[]): void {
+  /**
+   * Validate, normalize, and ensure filesystem access for a set of absolute paths.
+   *
+   * - Requires every entry to be an absolute path and throws if not.
+   * - Normalizes each path and deduplicates while preserving order.
+   * - Creates missing directories (or parent directories for file-like paths).
+   */
+  protected ensurePathsExist(paths?: string[]): string[] {
     if (!paths?.length) {
-      return
+      return []
     }
 
+    const sanitizedPaths: string[] = []
+    const seenPaths = new Set<string>()
+
     for (const rawPath of paths) {
       if (!rawPath) {
         continue
       }
 
-      const resolvedPath = path.resolve(rawPath)
+      if (!path.isAbsolute(rawPath)) {
+        throw new Error(`Accessible path must be absolute: ${rawPath}`)
+      }
+
+      // Normalize to provide consistent values to downstream consumers.
+      const resolvedPath = path.normalize(rawPath)
 
       let stats: fs.Stats | null = null
       try {
+        // Attempt to stat the path to understand whether it already exists and if it is a file.
         if (fs.existsSync(resolvedPath)) {
           stats = fs.statSync(resolvedPath)
         }
@@ -190,6 +206,7 @@ export abstract class BaseService {
       const looksLikeFile =
         (stats && stats.isFile()) || (!stats && path.extname(resolvedPath) !== '' && !resolvedPath.endsWith(path.sep))
 
+      // For file-like targets create the parent directory; otherwise ensure the directory itself.
       const directoryToEnsure = looksLikeFile ? path.dirname(resolvedPath) : resolvedPath
 
       if (!fs.existsSync(directoryToEnsure)) {
@@ -203,7 +220,15 @@ export abstract class BaseService {
           throw error
         }
       }
+
+      // Preserve the first occurrence only to avoid duplicates while keeping caller order stable.
+      if (!seenPaths.has(resolvedPath)) {
+        seenPaths.add(resolvedPath)
+        sanitizedPaths.push(resolvedPath)
+      }
     }
+
+    return sanitizedPaths
   }
 
   /**

src/main/services/agents/services/AgentService.ts

@@ -45,14 +45,16 @@ export class AgentService extends BaseService {
       req.accessible_paths = [defaultPath]
     }
 
+    if (req.accessible_paths !== undefined) {
+      req.accessible_paths = this.ensurePathsExist(req.accessible_paths)
+    }
+
     await this.validateAgentModels(req.type, {
       model: req.model,
       plan_model: req.plan_model,
       small_model: req.small_model
     })
 
-    this.ensurePathsExist(req.accessible_paths)
-
     const serializedReq = this.serializeJsonFields(req)
 
     const insertData: InsertAgentRow = {
@@ -137,8 +139,8 @@ export class AgentService extends BaseService {
 
     const now = new Date().toISOString()
 
-    if (updates.accessible_paths) {
+    if (updates.accessible_paths !== undefined) {
-      this.ensurePathsExist(updates.accessible_paths)
+      updates.accessible_paths = this.ensurePathsExist(updates.accessible_paths)
     }
 
     const modelUpdates: Partial<Record<AgentModelField, string | undefined>> = {}

src/main/services/agents/services/SessionService.ts

@@ -58,7 +58,9 @@ export class SessionService extends BaseService {
       small_model: sessionData.small_model
     })
 
-    this.ensurePathsExist(sessionData.accessible_paths)
+    if (sessionData.accessible_paths !== undefined) {
+      sessionData.accessible_paths = this.ensurePathsExist(sessionData.accessible_paths)
+    }
 
     const serializedData = this.serializeJsonFields(sessionData)
 
@@ -179,8 +181,8 @@ export class SessionService extends BaseService {
 
     const now = new Date().toISOString()
 
-    if (updates.accessible_paths) {
+    if (updates.accessible_paths !== undefined) {
-      this.ensurePathsExist(updates.accessible_paths)
+      updates.accessible_paths = this.ensurePathsExist(updates.accessible_paths)
     }
 
     const modelUpdates: Partial<Record<AgentModelField, string | undefined>> = {}

tests/apis/agents/sessions.http

@@ -2,7 +2,7 @@
 @host=http://localhost:23333
 @token=cs-sk-af798ed4-7cf5-4fd7-ae4b-df203b164194
 @agent_id=agent_1758092281575_tn9dxio9k
-@session_id=session_1758252305914_9kef8yven
+@session_id=session_1758278828236_mqj91e7c0
 
 ### List Sessions
 GET {{host}}/v1/agents/{{agent_id}}/sessions
@@ -16,11 +16,11 @@ Authorization: Bearer {{token}}
 Content-Type: application/json
 
 {
-  "name": "Story Writing Session 1",
+  "name": "Story Writing Session 2",
   "instructions": "You are a creative writing assistant. Help me brainstorm and write engaging stories.",
   "model": "anthropic:claude-sonnet-4",
   "accessible_paths": [
-    "~/Documents/stories"
+    "/tmp/Documents/stories"
   ]
 }
 
@@ -44,7 +44,7 @@ Content-Type: application/json
   "instructions": "You are a creative writing assistant. Help me brainstorm and write engaging stories.",
   "model": "anthropic:claude-sonnet-4",
   "accessible_paths": [
-    "~/Documents/stories"
+    "/tmp/Documents/stories"
   ]
 }
 
@@ -55,7 +55,10 @@ Authorization: Bearer {{token}}
 Content-Type: application/json
 
 {
-  "instructions": "You are a creative writing assistant. Help me brainstorm and write engaging stories. Focus on character development and plot structure.",
+  "model": "anthropic:claude-sonnet-4-20250514",
+  "accessible_paths": [
+    "/tmp/Documents/stories2"
+  ]
 }