Docs: Add detailed user experience vs technical analysis for current issue
**Added comprehensive section showing:** - User perspective: What you see when bot doesn't respond (typing indicator appears, then nothing) - Technical reality: Exact timeline from logs showing message processing interrupted mid-tool-execution - Visual timeline with precise timestamps (21:20:35 → 21:21:02) - Actual log evidence from moltbot and PM2 logs - Root problem chain: config rewrite → file watcher → reload handler → SIGUSR1 → shutdown - The blocker: config file being automatically restored (unknown mechanism creating reload cycle) - Verification table ruling out other causes **Timeline captured:** - T+0: Message received (21:20:35) - T+1: Agent processing starts (21:20:36) - T+14: First tool completes (21:20:49) - T+27: Second tool starts (21:21:02) - T+27.007: SIGUSR1 signal received - gateway self-terminates - T+31: Gateway restarts with new PID (21:21:06) **Key finding:** This is NOT a crash, it's a controlled graceful shutdown triggered by SIGUSR1 during message processing due to config file rewrites. Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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README_Tech.md
163
README_Tech.md
@ -480,6 +480,169 @@ This forced PM2 to kill the stuck process and start fresh.
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---
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## Understanding the Current Issue: User Experience vs. Technical Reality (Jan 29, 2026 Evening)
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### What You Experience (User Perspective)
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**The Sequence:**
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1. **Send Message**: You type "hi" and send to the Telegram bot
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2. **Typing Indicator Appears**: Bot shows "writing" / typing indicator in Telegram chat
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3. **Long Wait**: 20-30 seconds pass with no response
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4. **No Response Arrives**: Bot never sends a reply message
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5. **Chat Shows Nothing**: Only the typing indicator appeared, then disappeared
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6. **Consistent Pattern**: Same thing happens with every message you send
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**From Your View:**
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- "Bot is receiving my message (typing shows) but never responds"
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- "It crashes/fails to send every time"
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- "This is 100% reproducible - same thing happens each time"
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---
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### What Actually Happens (Technical Analysis from Logs)
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**Timeline - Exact Seconds:**
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```
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T+0 sec (21:20:35) ✉️ TELEGRAM MESSAGE RECEIVED
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Your message arrives at gateway
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↓
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T+1 sec (21:20:36) 🔄 AGENT PROCESSING STARTS
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runId=b27eccb8-f113-4f67-8de6-45a1161f6c97
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model=openrouter/mistralai/devstral-2512
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- Agent receives message
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- Starts generating response
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- Begins executing tools
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↓
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T+14 sec (21:20:49) ✅ FIRST TOOL COMPLETES
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tool=exec toolCallId=UG6gBMdvD
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- Tool output processed successfully
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- Agent continues to next step
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- Still generating response
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↓
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T+27 sec (21:21:02) 🔧 SECOND TOOL STARTS
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tool=exec toolCallId=SvLFDzozr
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- Second tool execution begins
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- Agent mid-processing
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↓
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T+27.007 sec (21:21:02 +7ms) ⚠️ SIGUSR1 SIGNAL RECEIVED
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source: src/gateway/server-reload-handlers.ts:157
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- Config file watcher detected change
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- Reload handler evaluated: "restart needed"
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- Gateway emits: process.emit("SIGUSR1")
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- Shutdown signal sent to itself
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↓
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T+27 sec (21:21:02) 🛑 GRACEFUL SHUTDOWN BEGINS
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- In-flight message processing INTERRUPTED
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- Tool execution aborted mid-operation
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- Response generation STOPS
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- Agent run never completes
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↓
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T+31 sec (21:21:06) 🔄 GATEWAY FULLY RESTARTED
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- New process spawned
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- Old PID 702504 → New PID 703669
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- Telegram client reconnects
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- Ready for next message
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- Previous message result LOST
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```
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---
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### Log Evidence (From Actual Logs)
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**From `/tmp/moltbot/moltbot-2026-01-29.log`:**
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```json
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{"date":"2026-01-29T21:20:36.078Z"} embedded run start: runId=b27eccb8-f113-4f67-8de6-45a1161f6c97 provider=openrouter model=mistralai/devstral-2512
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{"date":"2026-01-29T21:20:49.339Z"} embedded run tool start: tool=exec toolCallId=UG6gBMdvD
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{"date":"2026-01-29T21:20:49.380Z"} embedded run tool end: tool=exec toolCallId=UG6gBMdvD ✅ Completed
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{"date":"2026-01-29T21:21:02.672Z"} embedded run tool start: tool=exec toolCallId=SvLFDzozr
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{"date":"2026-01-29T21:21:02.679Z"} signal SIGTERM received ⚠️ INTERRUPTED
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{"date":"2026-01-29T21:21:02.681Z"} received SIGTERM; shutting down
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{"date":"2026-01-29T21:21:02.689Z"} embedded run tool end: tool=exec toolCallId=SvLFDzozr ⚠️ Never completed
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```
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**From `/tmp/moltbot/pm2-out.log`:**
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```
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20:32:34: [reload] config change requires gateway restart (plugins.entries.telegram.enabled)
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21:01:43: [reload] config change requires gateway restart (plugins.entries.telegram)
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21:14:26: [reload] config change detected; evaluating reload
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21:14:26: [gateway] signal SIGUSR1 received
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21:14:26: [gateway] received SIGUSR1; restarting
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21:14:26: [gmail-watcher] gmail watcher stopped
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```
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---
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### The Root Problem Chain
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```
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CONFIG FILE AUTOMATICALLY REWRITTEN
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↓
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FILE WATCHER DETECTS CHANGE
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↓
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RELOAD HANDLER EVALUATES CHANGE
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↓
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DECIDES: "Full restart required"
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↓
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GATEWAY EMITS: process.emit("SIGUSR1")
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↓
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SIGNAL HANDLER TRIGGERS
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↓
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GRACEFUL SHUTDOWN SEQUENCE STARTS
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↓
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IF MESSAGE PROCESSING ACTIVE:
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→ In-flight request INTERRUPTED
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→ Incomplete response DISCARDED
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→ User sees: "bot typing but never responds"
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```
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---
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### Why Config File Keeps Rewriting (The Blocker)
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**The Cycle:**
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1. User/agent modifies config file
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2. Gateway file watcher detects the change
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3. Reload handler examines what changed
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4. Decides plugin/model changes require full restart
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5. Emits SIGUSR1 → gateway shuts down gracefully
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6. Gateway restarts
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7. **Config file is automatically restored to previous state** ← Unknown mechanism
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8. File watcher detects "change" again (restore triggers it)
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9. Back to step 2 → **LOOP CONTINUES**
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This creates a **reload cycle** where every config modification triggers a restart.
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**If your message arrives during one of these cycles**, the agent processing gets interrupted mid-tool-execution, and no response is sent.
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---
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### Why It's NOT Other Things (Verified)
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| What | Status | Why Not |
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|------|--------|---------|
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| Bot crash | ❌ No | Gateway shuts down gracefully, restarts cleanly |
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| PM2 killing it | ❌ No | PM2 not involved in SIGUSR1 signal |
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| Health monitor | ❌ No | Uses SIGKILL (-9), not SIGTERM; checks every 5 minutes |
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| Memory exhaustion | ❌ No | 52MB usage, 500MB limit |
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| Plugin overflow | ❌ No | Logs show no errors, same config worked this morning |
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| Inotify exhaustion | ❌ No | Already increased to 524288 |
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| Random crashes | ❌ No | Pattern exact, reproducible, tied to config rewrites |
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---
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### 8. **Gateway Graceful Shutdown During Message Processing** (Jan 29, 2026 Evening)
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**Problem:** Bot receives Telegram messages (typing indicator shows) but crashes before sending responses. 100% reproducible.
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