> ## Documentation Index > Fetch the complete documentation index at: https://cntillion.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # What Centillion is > An AI customer service agent that answers from knowledge you control, on your website, WhatsApp, email, phone and more. See every feature and start free. What Centillion isAn AI agent that answers your customers from knowledge you control, on your website, WhatsApp, email and phone. Centillion builds AI agents that answer customer questions. You give an agent the material your business already has, its website pages, its policy documents, the answers your support team types out fifteen times a week. The agent answers from that material and nothing else. Then you put it where your customers are. A chat on your website, WhatsApp, Messenger, Instagram, Slack, your support inbox. The same agent, the same knowledge, wherever the question arrives. Enable Helpdesk and switch on escalation for a channel, and what it cannot answer becomes a ticket for a person. Start with the Free plan for website chat. Connected channels require Hobby or above; Helpdesk, campaigns and voice require Standard or above. Each workspace has its own [plan, limits and credit balances](https://cntillion.com/docs/workspaces/billing.md). ## The four things you will do > [card] [Create an agent](https://cntillion.com/docs/agents/create-an-agent.md) > > Name it, tell it who it works for and how to behave. > [card] [Add knowledge](https://cntillion.com/docs/agents/knowledge.md) > > Import your website, upload documents, write exact answers for the questions > that matter most. > [card] [Check training](https://cntillion.com/docs/agents/training-and-publishing.md) > > Sources train automatically. Check progress and test the answers. > [card] [Put it somewhere](https://cntillion.com/docs/channels/website.md) > > One snippet for your website, or a sign-in for each messaging channel. In a hurry? The [quickstart](https://cntillion.com/docs/quickstart.md) runs through all four. ## Everything the agent can do One article per capability. Each one explains what the feature does, shows the dashboard, and walks through setup and daily use. ### Reach your customers > [card] [AI chat widget for your website](https://cntillion.com/docs/channels/website.md) > > A floating chat bubble, an inline chat or a help page, installed with one snippet. > [card] [WhatsApp AI agent](https://cntillion.com/docs/channels/whatsapp.md) > > Answers on your WhatsApp Business number, inside the 24-hour window and with templates. > [card] [AI email support agent](https://cntillion.com/docs/channels/email.md) > > A generated address, a forwarded company address or a connected Gmail or Outlook inbox. > [card] [Phone numbers for your AI agent](https://cntillion.com/docs/channels/phone.md) > > Import Twilio or SIP trunk numbers and choose which agent answers their calls. > [card] [Text messages (SMS)](https://cntillion.com/docs/channels/sms.md) > > A US business number your customers can text, answered by your agent. > [card] [Messenger](https://cntillion.com/docs/channels/messenger.md) > > Conversations from your Facebook Pages, with optional comment tickets. > [card] [Instagram](https://cntillion.com/docs/channels/instagram.md) > > Direct messages answered, comments turned into tickets. > [card] [Slack](https://cntillion.com/docs/channels/slack.md) > > Mention the agent in a channel and get the answer in the thread. > [card] [Shopify AI customer support](https://cntillion.com/docs/channels/shopify.md) > > Chat in your storefront theme, with product search, carts, orders and returns. > [card] [Salesforce](https://cntillion.com/docs/channels/salesforce.md) > > Cases answered by email or as drafts, chats handed to Salesforce live chat. > [card] [iOS and Android SDKs](https://cntillion.com/docs/channels/mobile-sdk.md) > > Your agent inside a native app, with signed-in users and app actions. > [card] [Zapier](https://cntillion.com/docs/channels/zapier.md) > > Send leads to your apps and use the agent in automated workflows. > [card] [Win customers back on WhatsApp](https://cntillion.com/docs/campaigns.md) > > Outbound template campaigns to your own contacts, with replies handled by the agent or your team. ### Build your agent > [card] [Build an AI customer support agent](https://cntillion.com/docs/agents/create-an-agent.md) > > Instructions, guardrails, model choice and side-by-side model comparison. > [card] [Train it on your website and documents](https://cntillion.com/docs/agents/knowledge.md) > > Files, websites, text, Q\&A, Notion pages and support tickets, with weekly auto-resync. > [card] [Custom tools](https://cntillion.com/docs/agents/custom-actions.md) > > Call your API, run website code, show interactive cards in chat. > [card] [Collect leads and data](https://cntillion.com/docs/agents/collect-data.md) > > Structured details captured during a conversation and delivered by webhook or email. > [card] [Test it before customers do](https://cntillion.com/docs/agents/tests.md) > > Simulated customer conversations, scored by a judge. > [card] [Mastermind](https://cntillion.com/docs/agents/mastermind.md) > > Ask about your agent and change it in plain language, with approval before changes unless you choose auto-approve. > [card] [Releases, shared tools and workflows](https://cntillion.com/docs/agents/releases-and-workflows.md) > > Publish versions, reuse resources, route to specialists, measure outcomes. ### Support > [card] [AI helpdesk with human handoff](https://cntillion.com/docs/helpdesk.md) > > Tickets, teams, AI drafts and live takeover from one inbox. > [card] [Product issues in Notion](https://cntillion.com/docs/helpdesk/product-issues.md) > > Group support reports into one bug and keep its progress visible. ### Customer data > [card] [Connect HubSpot, Salesforce or Intercom](https://cntillion.com/docs/customer-data/crm-integrations.md) > > Sync contacts in, log what the agent learns back to the CRM. > [card] [Stripe billing answers in chat](https://cntillion.com/docs/customer-data/stripe.md) > > Identified customers see their invoices and subscriptions. > [card] [Identity verification](https://cntillion.com/docs/customer-data/identity-verification.md) > > Authenticate signed-in website users in the widget and sync their contacts. > [card] [Churn reasons](https://cntillion.com/docs/customer-data/churn-reasons.md) > > Why customers leave, from every conversation, grouped by reason. ## Answers come from your knowledge This is the part worth understanding before anything else. An agent does not know about your business until you tell it. When a question arrives, Centillion searches what you have given that agent, picks the handful of most relevant passages, and writes an answer from them. Material you have not added is material it cannot use. That is the trade. The agent will not confidently invent your refund window, and it will also not guess one when you forgot to tell it. Both of those follow from the same design. Knowledge is versioned. Saving a source queues training automatically, and a complete training run makes the updated content searchable in the agent's current configuration. Removing a source or excluding a page updates that configuration too. A [published release](https://cntillion.com/docs/agents/releases-and-workflows.md) keeps the knowledge saved with its version, including shared workspace knowledge. Later source edits or removals do not change that saved knowledge. After training finishes, capture and publish a new version to use the changes in new conversations. Existing conversations stay on the release where they started. ## When the agent should not answer Some questions want a person, and the agent is built to hand those over rather than improvise. A customer asking for a human pauses the conversation. So does your own team replying in WhatsApp or Facebook, so two answers never go out at once. Public comments on social posts are never answered automatically at all. Handing over is something you switch on rather than something you get. Helpdesk has to be enabled, the escalation action has to be on, and it has to cover the channel the customer is writing from. Miss one of those and the agent has nowhere to send them, so it keeps trying to answer. The action ships covering website chat, the help page and the API, so WhatsApp, email and the social channels need adding by hand. With that configured, what needs a person lands in [Helpdesk](https://cntillion.com/docs/helpdesk.md), with the conversation attached. [Outbound WhatsApp campaigns](https://cntillion.com/docs/campaigns.md) can send replies straight to your team too. Choose **Human takeover** when creating the campaign with Helpdesk enabled. Each recipient's first reply opens a ticket and pauses AI replies until your team closes the ticket or allows the agent to answer again. Teams can also start website and mobile SDK conversations with a person using **Human-first conversations**, and choose whether ticket closure resumes AI in [Human handoff settings](https://cntillion.com/docs/helpdesk.md#start-with-human-support). Email support can also go to [Zendesk](https://cntillion.com/docs/helpdesk/zendesk-email.md). A Create ticket action pauses the original email conversation while your team answers in Zendesk, then resumes AI replies when the linked ticket is Solved or Closed. ## What it is not * **It is not a search box.** It answers in sentences, and it follows the conversation rather than treating every message as a fresh question. * **It is not a bulk messaging tool.** Agents reply to people who wrote first. The exception is an [Outbound campaign](https://cntillion.com/docs/campaigns.md): an approved WhatsApp template to customers you already have, who agreed to hear from you. * **It does not learn from conversations.** It learns from the knowledge you add and update. A conversation that went badly does not silently change future answers, which means you can fix the cause instead of hoping. ## Where to go next Start with the [quickstart](https://cntillion.com/docs/quickstart.md) if you have an agent to build today. Start with [Adding knowledge](https://cntillion.com/docs/agents/knowledge.md) if you already have one and want it to answer better. Start with [My agent is not answering](https://cntillion.com/docs/troubleshooting.md) if something is wrong right now. This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.