Silently return when bot.stop() aborts the setup phase

If bot.stop() is called while bot.start() is still in setup (deleteWebhook/
getMe), grammy rejects with 'Aborted delay'. Expected, not an error.

external_plugins/telegram/server.ts

@@ -15,7 +15,7 @@ import {
   ListToolsRequestSchema,
   CallToolRequestSchema,
 } from '@modelcontextprotocol/sdk/types.js'
-import { Bot, InputFile, type Context } from 'grammy'
+import { Bot, GrammyError, InputFile, type Context } from 'grammy'
 import type { ReactionTypeEmoji } from 'grammy/types'
 import { randomBytes } from 'crypto'
 import { readFileSync, writeFileSync, mkdirSync, readdirSync, rmSync, statSync, renameSync, realpathSync, chmodSync } from 'fs'
@@ -304,7 +304,7 @@ function checkApprovals(): void {
   }
 }
 
-if (!STATIC) setInterval(checkApprovals, 5000).unref()
+if (!STATIC) setInterval(checkApprovals, 5000)
 
 // Telegram caps messages at 4096 chars. Split long replies, preferring
 // paragraph boundaries when chunkMode is 'newline'.
@@ -507,24 +507,6 @@ mcp.setRequestHandler(CallToolRequestSchema, async req => {
 
 await mcp.connect(new StdioServerTransport())
 
-// When Claude Code closes the MCP connection, stdin gets EOF. Without this
-// the bot keeps polling forever as a zombie, holding the token and blocking
-// the next session with 409 Conflict.
-let shuttingDown = false
-function shutdown(): void {
-  if (shuttingDown) return
-  shuttingDown = true
-  process.stderr.write('telegram channel: shutting down\n')
-  // bot.stop() signals the poll loop to end; the current getUpdates request
-  // may take up to its long-poll timeout to return. Force-exit after 2s.
-  setTimeout(() => process.exit(0), 2000)
-  void Promise.resolve(bot.stop()).finally(() => process.exit(0))
-}
-process.stdin.on('end', shutdown)
-process.stdin.on('close', shutdown)
-process.on('SIGTERM', shutdown)
-process.on('SIGINT', shutdown)
-
 bot.on('message:text', async ctx => {
   await handleInbound(ctx, ctx.message.text, undefined)
 })
@@ -611,9 +593,35 @@ async function handleInbound(
   })
 }
 
-void bot.start({
+// 409 Conflict = another getUpdates consumer is still active (zombie from a
-  onStart: info => {
+// previous session, or a second Claude Code instance). Retry with backoff
-    botUsername = info.username
+// until the slot frees up instead of crashing on the first rejection.
-    process.stderr.write(`telegram channel: polling as @${info.username}\n`)
+void (async () => {
-  },
+  for (let attempt = 1; ; attempt++) {
-})
+    try {
+      await bot.start({
+        onStart: info => {
+          botUsername = info.username
+          process.stderr.write(`telegram channel: polling as @${info.username}\n`)
+        },
+      })
+      return // bot.stop() was called — clean exit from the loop
+    } catch (err) {
+      if (err instanceof GrammyError && err.error_code === 409) {
+        const delay = Math.min(1000 * attempt, 15000)
+        const detail = attempt === 1
+          ? ' — another instance is polling (zombie session, or a second Claude Code running?)'
+          : ''
+        process.stderr.write(
+          `telegram channel: 409 Conflict${detail}, retrying in ${delay / 1000}s\n`,
+        )
+        await new Promise(r => setTimeout(r, delay))
+        continue
+      }
+      // bot.stop() mid-setup rejects with grammy's "Aborted delay" — expected, not an error.
+      if (err instanceof Error && err.message === 'Aborted delay') return
+      process.stderr.write(`telegram channel: polling failed: ${err}\n`)
+      return
+    }
+  }
+})()