---
phase: 01-foundation
plan: 01
subsystem: messaging
tags: [n8n, telegram, webhook, bot, auth]

# Dependency graph
requires: []
provides:
  - n8n workflow JSON for Telegram echo bot
  - User authentication via environment variable
  - Message round-trip foundation (Telegram -> n8n -> Telegram)
affects: [02-docker-integration, 03-container-actions]

# Tech tracking
tech-stack:
  added: [n8n-nodes-base.telegramTrigger, n8n-nodes-base.if, n8n-nodes-base.code, n8n-nodes-base.telegram]
  patterns: [env-var-auth, silent-ignore-unauthorized]

key-files:
  created: [n8n-workflow.json]
  modified: []

key-decisions:
  - "Environment variable auth ($env.TELEGRAM_USER_ID) instead of hardcoded"
  - "Silent ignore on false branch (no unauthorized response)"
  - "HTML parse mode for future formatting flexibility"

patterns-established:
  - "Auth pattern: IF node checks user ID from environment variable"
  - "Echo pattern: Code node formats message with timestamp before sending"

# Metrics
duration: 5min
completed: 2026-01-28
---

# Phase 1 Plan 1: Telegram Echo Bot Summary

**n8n workflow with Telegram trigger, user ID authentication via environment variable, and echo response with timestamp**

## Performance

- **Duration:** 5 min
- **Started:** 2026-01-28
- **Completed:** 2026-01-28
- **Tasks:** 2 (1 human-action, 1 auto)
- **Files modified:** 1

## Accomplishments
- Telegram bot created and configured in n8n (user action)
- n8n workflow JSON created with 4 nodes: Trigger, IF, Code, Send
- User authentication via $env.TELEGRAM_USER_ID environment variable
- Silent ignore for unauthorized users (no false branch nodes)
- Echo response includes original text and ISO timestamp

## Task Commits

Each task was committed atomically:

1. **Task 1: Create Telegram Bot and Configure n8n** - (human action, no commit)
2. **Task 2: Create n8n Workflow for Telegram Echo** - `9d503bb` (feat)

## Files Created/Modified
- `n8n-workflow.json` - Complete n8n workflow definition for import

## Decisions Made
- Used environment variable ($env.TELEGRAM_USER_ID) for auth - keeps sensitive data out of workflow JSON
- HTML parse mode enabled for future formatting (bold, italic, links)
- Silent ignore (empty false branch) for unauthorized users - no information leak

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None - workflow JSON created and validated successfully.

## User Setup Required

User completed setup during Task 1:
- Created Telegram bot via @BotFather
- Configured TELEGRAM_BOT_TOKEN and TELEGRAM_USER_ID as n8n container environment variables
- Created Telegram API credential in n8n

## Next Phase Readiness
- Workflow JSON ready for import into n8n
- User must import workflow and activate it to test echo functionality
- Foundation ready for Docker integration (Phase 2)

---
*Phase: 01-foundation*
*Completed: 2026-01-28*