diff --git a/src/server/routes/info.ts b/src/server/routes/info.ts
index fd3e7adff..518f90c14 100644
--- a/src/server/routes/info.ts
+++ b/src/server/routes/info.ts
@@ -45,8 +45,17 @@ export function createInfoRoutes(sessionManager: SessionManager): Hono {
     })
     .get('/agent', c => {
       const allAgents = getBuiltInAgents()
-      return c.json(
-        allAgents.map(a => ({
+      const defaultMode = {
+        name: 'build',
+        description: 'Default mode for software engineering tasks: writing code, editing files, running commands, and building projects.',
+        mode: 'primary' as const,
+        hidden: false,
+        options: {},
+        permission: [],
+      }
+      return c.json([
+        defaultMode,
+        ...allAgents.map(a => ({
           name: a.agentType,
           description: a.whenToUse,
           mode: a.isMainThread ? ('primary' as const) : ('subagent' as const),
@@ -54,7 +63,7 @@ export function createInfoRoutes(sessionManager: SessionManager): Hono {
           options: {},
           permission: [],
         })),
-      )
+      ])
     })
     .get('/mcp', async c => {
       for (const handle of sessionManager.getAllSessions()) {
diff --git a/src/server/routes/message.ts b/src/server/routes/message.ts
index 6c0c072d9..9b319ef0f 100644
--- a/src/server/routes/message.ts
+++ b/src/server/routes/message.ts
@@ -20,7 +20,7 @@ export function createMessageRoutes(sessionManager: SessionManager): Hono {
 
       const { messages, nextCursor } = await readSessionMessages({
         sessionId: id,
-        cwd: handle?.cwd,
+        cwd: handle?.spawnCwd ?? handle?.cwd,
         limit,
         before,
         includeSystem,
@@ -39,7 +39,7 @@ export function createMessageRoutes(sessionManager: SessionManager): Hono {
 
       const todos = await readSessionTodos({
         sessionId: id,
-        cwd: handle?.cwd,
+        cwd: handle?.spawnCwd ?? handle?.cwd,
       })
 
       return c.json({ todos })
@@ -53,7 +53,7 @@ export function createMessageRoutes(sessionManager: SessionManager): Hono {
 
       const { diffs } = await readSessionDiff({
         sessionId: id,
-        cwd: handle?.cwd,
+        cwd: handle?.spawnCwd ?? handle?.cwd,
         messageID,
       })
 
diff --git a/src/server/routes/session.ts b/src/server/routes/session.ts
index 719fa7157..463aca009 100644
--- a/src/server/routes/session.ts
+++ b/src/server/routes/session.ts
@@ -151,6 +151,9 @@ export function createSessionRoutes(
           scriptArgs: getScriptArgsForChild(),
         })
 
+        // 等待子进程初始化完成，确保 ready 后再返回，避免立即发 prompt 时子进程还未就绪
+        await handle.waitReady(30000)
+
         const info = handle.getInfo()
         return c.json(
           {
@@ -187,10 +190,7 @@ export function createSessionRoutes(
       let historySessions: Awaited<ReturnType<typeof listSessionsImpl>> = []
       try {
         historySessions = await listSessionsImpl({ dir, limit: limit + offset })
-        process.stderr.write(`[server:session] listSessionsImpl dir=${dir ?? 'all'} found=${historySessions.length}\n`)
-      } catch (err) {
-        process.stderr.write(`[server:session] listSessionsImpl error: ${err}\n`)
-      }
+      } catch {}
 
       // 内存中活跃的 handle，用于覆盖运行时状态
       const handleMap = new Map(
@@ -245,7 +245,6 @@ export function createSessionRoutes(
       filtered.sort((a, b) => (b.last_active_at ?? 0) - (a.last_active_at ?? 0))
 
       const sessions = filtered.slice(offset, offset + limit)
-      process.stderr.write(`[server:session] GET /session -> history=${historySessions.length} active=${handleMap.size} merged=${merged.length} returned=${sessions.length}\n`)
       return c.json({ sessions })
     })
     .get('/session/status', async c => {
@@ -282,7 +281,7 @@ export function createSessionRoutes(
           status: st.status,
           state: st.status,
           has_pending_permission: st.has_pending_permission,
-          type: st.status === 'running' ? 'busy' : 'idle',
+          type: st.prompting ? 'busy' : 'idle',
         }
       }
 
diff --git a/src/server/sessionHandle.ts b/src/server/sessionHandle.ts
index 500627029..315b36d2a 100644
--- a/src/server/sessionHandle.ts
+++ b/src/server/sessionHandle.ts
@@ -115,6 +115,8 @@ function loadChildSpawnPrefix(): { execPath: string; scriptArgs: string[]; defin
 export class SessionHandle {
   readonly sessionId: string
   readonly cwd: string
+  /** 子进程实际的工作目录，dev 模式下与 cwd 不同（csc 根目录），用于定位 transcript 文件 */
+  private _spawnCwd: string | undefined
   private child: ChildProcess | null = null
   private _status: SessionState = 'starting'
   private _model?: string
@@ -189,6 +191,10 @@ export class SessionHandle {
     return this.opts.silent ?? false
   }
 
+  get spawnCwd(): string {
+    return this._spawnCwd ?? this.cwd
+  }
+
   async waitReady(timeoutMs = 30000): Promise<void> {
     if (this._status === 'running') return
     if (this._status === 'stopped') {
@@ -199,11 +205,17 @@ export class SessionHandle {
         reject(new Error(`Session ${this.sessionId} init timed out`))
       }, timeoutMs)
       const origResolve = this.initResolve
+      const origReject = this.initReject
       this.initResolve = (data: InitData) => {
         clearTimeout(timer)
         origResolve?.(data)
         resolve()
       }
+      this.initReject = (err: unknown) => {
+        clearTimeout(timer)
+        origReject?.(err)
+        reject(err)
+      }
     })
   }
 
@@ -263,6 +275,7 @@ export class SessionHandle {
     const featureArgs = saved?.featureArgs ?? []
     const spawnArgs = [...defineArgs, ...featureArgs, ...this.opts.scriptArgs, ...printArgs]
 
+    this._spawnCwd = this.opts.cwd
     this.child = spawn(this.opts.execPath, spawnArgs, {
       cwd: this.opts.cwd,
       stdio: ['pipe', 'pipe', 'pipe'],
@@ -282,8 +295,11 @@ export class SessionHandle {
           signal: signal ?? null,
         })
       }
-      if (this.initResolve) {
+      if (this.initReject) {
+        const reject = this.initReject
         this.initResolve = null
+        this.initReject = null
+        reject(new Error(`Process exited with code ${code}`))
       }
       if (this.promptReject) {
         this.promptReject(new Error(`Process exited with code ${code}`))
@@ -293,8 +309,11 @@ export class SessionHandle {
     this.child.on('error', err => {
       logError(err)
       this._status = 'stopped'
-      if (this.initResolve) {
+      if (this.initReject) {
+        const reject = this.initReject
         this.initResolve = null
+        this.initReject = null
+        reject(err)
       }
       if (this.promptReject) {
         this.promptReject(err)
@@ -305,13 +324,17 @@ export class SessionHandle {
     this.sendInitialize()
 
     const timeout = setTimeout(() => {
-      this.initResolve = null
-      this.initReject = null
-      this._status = 'stopped'
-      this.emitEvent('deleted', {
-        status: 'stopped',
-        reason: 'init_timeout',
-      })
+      if (this.initReject) {
+        const reject = this.initReject
+        this.initResolve = null
+        this.initReject = null
+        this._status = 'stopped'
+        this.emitEvent('deleted', {
+          status: 'stopped',
+          reason: 'init_timeout',
+        })
+        reject(new Error(`Session ${this.sessionId} init timed out`))
+      }
     }, 30000)
 
     this.initResolve = (data: InitData) => {
diff --git a/src/server/sessionManager.ts b/src/server/sessionManager.ts
index 7da799c46..bc2d227cb 100644
--- a/src/server/sessionManager.ts
+++ b/src/server/sessionManager.ts
@@ -128,16 +128,17 @@ export class SessionManager {
 
   getSessionStatuses(): Record<
     string,
-    { status: SessionState; has_pending_permission: boolean }
+    { status: SessionState; has_pending_permission: boolean; prompting: boolean }
   > {
     const result: Record<
       string,
-      { status: SessionState; has_pending_permission: boolean }
+      { status: SessionState; has_pending_permission: boolean; prompting: boolean }
     > = {}
     for (const [id, handle] of this.sessions) {
       result[id] = {
         status: handle.status,
         has_pending_permission: handle.getPendingPermissions().length > 0,
+        prompting: handle.prompting,
       }
     }
     return result
diff --git a/src/server/transcriptReader.ts b/src/server/transcriptReader.ts
index 6fc63aa6b..4c48a92bc 100644
--- a/src/server/transcriptReader.ts
+++ b/src/server/transcriptReader.ts
@@ -63,10 +63,13 @@ async function resolveTranscriptPath(
 ): Promise<string | null> {
   const cacheKey = `${sessionId}:${cwd ?? ''}`
   const cached = pathCache.get(cacheKey)
-  if (cached !== undefined) return cached
+  // 只缓存找到的路径，不缓存 null（文件可能还未写入）
+  if (cached !== undefined && cached !== null) return cached
 
   const result = await resolveTranscriptPathUncached(sessionId, cwd)
-  pathCache.set(cacheKey, result)
+  if (result !== null) {
+    pathCache.set(cacheKey, result)
+  }
   return result
 }
 
diff --git a/tsconfig.json b/tsconfig.json
index 62c07df60..f7cac0b34 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,6 +1,8 @@
 {
     "extends": "./tsconfig.base.json",
     "compilerOptions": {
+        "baseUrl": ".",
+        "ignoreDeprecations": "6.0",
         "paths": {
             "src/*": ["./src/*"],
             "@claude-code-best/builtin-tools/*": ["./packages/builtin-tools/src/*"],