Answers from your instructions
Describe its role, what it knows and what it must not do in plain words; the next message follows it.
LINE OA × Codex · Agent Lab
Connect your LINE OA
from Codex.
Add LINE OA MCP to Codex and say "connect my LINE OA to AI". Codex creates the connection, sends you a secure page for the channel, sets how the AI answers and confirms the first reply; it answers test users until you approve every friend.
> connect my LINE OA to AI
line_connect_accountsetup link sent
line_get_connectionchannel entered · webhook set
line_configure_botinstructions saved
Live: your test account got its first AI reply
Why connect LINE from Codex
Codex does the setup, you keep the keys
Test users first
It answers your paired test account until you approve answering every friend, signed in.
Secrets stay out of the chat
The Channel ID and Secret go on the service's own page; the AI tool never sees them.
Replies don't use your quota
On LINE's plans replies are free; it replies first and pushes only when the reply window has passed.
Your options
Codex with LINE OA MCP, or a bot it codes from scratch
Scroll the table sideways.
| What you care about | Codex + LINE OA MCP | Codex codes a LINE bot |
|---|---|---|
| What you do | Say one sentence, fill in a secure page | Have it write a webhook, deploy it, configure LINE Developers |
| Channel Secret | Codex never sees it | Handed to the AI or written into config |
| Webhook URL | Set and verified for you | Deploy and paste it into the LINE console yourself |
| Going live | Test users first, every friend after you approve | Write it yourself |
| Changing answers | Edit the instructions; the next message follows | Change code and redeploy |
Steps
Connect LINE from Codex in four steps
Set up LINE OA MCP
Run it on Agent Lab from the setup guide, sign in to its panel and create an agent token.
Add it to Codex
Put the setup below in ~/.codex/config.toml and the agent token in LINE_AGENT_SDK_TOKEN, then restart Codex.
Enter the channel on the secure page
Your AI tool gives you a link. Enter the Channel ID and Secret there; no long-lived token needed. No Official Account yet? Try the shared sandbox.
Test, then approve
Chat from your test account and tune the instructions. When it's ready, approve answering every friend.
Setup
Connect Codex to LINE OA MCP
Replace <org> with your Agent Lab organization. The token stays in the environment; never write it into the file or paste it into the chat.
~/.codex/config.toml
[mcp_servers.line-oa-mcp]
url = "https://line-oa-mcp--<org>.hosting.agentlab.run/mcp"
bearer_token_env_var = "LINE_AGENT_SDK_TOKEN"LINE_AGENT_SDK_TOKENthe agent token from the panel's Agent tokens page.line_*ten tools: connect, read progress, set the instructions, request going live, read messages, sandbox and more.
Then say this
Read https://agentlab.cresclab.com/line-agent-sdk.md and connect my LINE Official Account to AI. Answer only my test account for now. It's the front desk of my café: answer opening hours and menu questions; for bookings, ask for name, date and party size. Give me a secure link for anything I need to enter.FAQ
LINE with Codex: questions
Can Codex connect a LINE Official Account by itself?
Yes, with LINE OA MCP. Codex creates the connection and follows whose turn each step is; the steps LINE requires of a person, such as entering the channel or approving every friend, come back to you as links. LINE OA MCP tools →
How do I change how the bot answers from Codex?
Tell Codex what to change. It updates the instructions (up to 4,000 characters) with line_configure_bot, and the next message follows them; it can also turn AI replies off.
Will the AI see my Channel Secret?
No. The Channel ID and Secret are entered on the service's own page, and the AI tool only gets an agent token from an environment variable. Never paste a secret into the chat. LINE OA MCP tools →
Can I try it without a LINE Official Account?
Yes. A shared sandbox gives you a join code: add it as a friend, send the code, and your AI answers you there. Creating a real Official Account is done by you in LINE Official Account Manager; LINE offers no API for it.
Do AI replies count toward LINE's message quota?
Under LINE's Official Account plans, replies to a user don't count toward the monthly message count; only push messages do. The agent replies by default and pushes only when the reply window has passed.