Builds run in the background
build_website and edit_website return a build_id straight away. The build runs on CreonOS and usually takes a few minutes; get_build_status reports progress and the result.
CreonOS: a hosted MCP server that builds and publishes websites
Any MCP client with OAuth sign in can use CreonOS to build a website from a description, change it, follow the build, and publish it to a public address. Each person signs in with their own CreonOS account and builds on their own credits.
Connection
Endpoint and sign in
- Endpoint
https://www.creonai.io/mcp- Transport
- Streamable HTTP, stateless, JSON responses. Protocol 2026-07-28, and older clients that send
initialize(2025-11-25, 2025-06-18). - Sign in
- OAuth 2.1 with PKCE (S256 only). Client ID Metadata Documents are supported, and Dynamic Client Registration for clients that need it. Discovery at
https://www.creonai.io/.well-known/oauth-protected-resource/mcpandhttps://www.creonai.io/.well-known/oauth-authorization-server. - Scope
creon. What a connection may do (build, publish) and its daily credit limit are set by the person on the consent screen and can be changed at any time in CreonOS.- Who can connect
- Any CreonOS account with a verified email, free or paid.
Tools
The fourteen tools
Every tool has a title and explicit read only, destructive, idempotent and open world hints.
| Tool | What it does | Read only | Destructive |
|---|---|---|---|
get_account | Plan, credit balance, what can still be spent today, published sites, and any build in progress. | Yes | No |
list_projects | The account's projects with their published addresses. | Yes | No |
build_website | Starts building a new website in a new project from a description. Returns a build_id. | No | No |
edit_website | Starts a change to an existing project. Returns a build_id. | No | Yes |
get_build_status | Progress, files changed, credits used and, when finished, a summary. | Yes | No |
cancel_build | Stops a queued or running build. | No | Yes |
publish_website | Puts a project's site on a public creonos.co.uk address, if the person allowed publishing. | No | Yes |
unpublish_website | Takes a published site down. | No | Yes |
audit_website | Checks any public web page and returns a score out of 100 and the main problems, each with a fix. Free. | Yes | No |
preview_website | A picture of a project's page as it looks on a phone, shown as a card with Publish and Open buttons where the assistant supports MCP Apps. One credit. | Yes | No |
get_enquiries | The messages visitors sent through the contact forms on the account's published sites. | Yes | No |
ask_creon_team | Sends the person's request for help to the CreonOS team, who reply by email. | No | No |
connect_domain | Connects a domain the person owns to one of their published sites and returns the nameservers to set. Plans that include their own web address. | No | No |
check_domain | Reports how far a connected domain has got, and finishes the set up once its nameservers point at CreonOS. | No | No |
Behaviour
Long builds, limits and safety
Limits in the account, not the client
One build at a time per account, the plan's own limits, and a daily credit limit for each connection that the person sets. A connection is cut off at once if it is disconnected or the account is suspended.
Public only on request
Nothing is published unless the person allowed publishing for that connection and publish_website is called. unpublish_website takes a site down again.
CreonOS receives only the tool arguments a client sends. It never asks for or stores the conversation.