Messaging API

What it does

When your agent uses it

• Asks to build a LINE Bot
• Set up a webhook
• Send a push message
• Design a Flex Message

Example prompts

• “build a LINE Bot”
• “set up a webhook”
• “send a push message”
• “/messaging-api”

Requirements

• Node.js
• A credential in LINE_CHANNEL_ACCESS_TOKEN
• A credential in LINE_CHANNEL_SECRET

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

1. 1Read references/api-common.md (rate limits, forward compatibility, error handling)
2. 2Load the relevant reference for the feature being implemented
3. 3For architecture or design choices, consult references/experts.md for directional guidance
4. 4Write code following specs and constraints from references

What it can do on your machine

Read from SKILL.md and the folder at commit 000116a. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  No scripts in the folder and no shell commands in SKILL.md (its code samples are json).

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  Links to these hosts (documentation or services it may open):

  • github.com
  • developers.line.biz

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names these keys or tokens, usually read from environment variables:

  • LINE_CHANNEL_SECRET
  • LINE_CHANNEL_ACCESS_TOKEN

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Messaging API loads about 1.7k tokens when it runs. Until then it costs about 208 tokens; SKILL.md has 428 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~208

When it runs · the whole SKILL.md, loaded when a task matches

~1.7k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from majiayu000/claude-skill-registry at commit 000116a, republished under its MIT licence (© majiayu000). 428 words, ~1,726 tokens.

name

messaging-api

description

Comprehensive reference for LINE Messaging API — webhook setup, message sending, Flex Message design, Rich Menu management, audience targeting, insights, coupons, and channel access tokens. This skill should be used when the user asks to "build a LINE Bot", "set up a webhook", "send a push message", "design a Flex Message", "create a Rich Menu", "manage audience targeting", "get messaging insights", "create a coupon campaign", "debug webhook signature verification", or mentions LINE Messaging API, LINE OA chatbot, reply/push/multicast/narrowcast/broadcast, Flex Message JSON, Rich Menu, group chat bot, channel access token, or URL schemes. Always use this skill whenever the user mentions LINE bots, chatbots, LINE OA, or any messaging-related LINE integration, even if they don't explicitly say "Messaging API".

LINE_CHANNEL_ACCESS_TOKEN=Bot access token
LINE_CHANNEL_SECRET=Channel secret (webhook signature verification)

channel_secret = ENV['LINE_CHANNEL_SECRET']
signature = request.headers['x-line-signature']
body = request.body   # raw bytes, do NOT parse/reformat before verification

digest = HMAC_SHA256(key = channel_secret, message = body)
expected = Base64.encode(digest)

if signature != expected:
    return 403  # reject — not from LINE

events = JSON.parse(body)['events']
for event in events:
    handle(event)
return 200

Container (Bubble / Carousel)
  └── Block (Header / Hero / Body / Footer)
       └── Component (Box / Button / Image / Video / Icon / Text / Span / Separator)

{
  "type": "flex", "altText": "Notification",
  "contents": {
    "type": "bubble",
    "body": {
      "type": "box", "layout": "vertical",
      "contents": [{"type": "text", "text": "Hello Flex!", "weight": "bold"}]
    }
  }
}

© majiayu000, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file in skills/api/messaging-api of majiayu000/claude-skill-registry.

• SKILL.md
• metadata.json

Open the folder on GitHubat commit 000116a

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in majiayu000/claude-skill-registry, which our catalogue first saw on October 7, 2026.

• NeverSight/learn-skills.devdata/skills-md/abgne/line-dev/messaging-api