The OnlyWorlds MCP server,
connected in one click.
Read and write typed fictional worlds (22 linked element types) via the OnlyWorlds open standard. Connect the official OnlyWorlds MCP server to Claude, ChatGPT, or Cursor through gate — one gateway URL, no config files, security-checked.
Free to start · No credit card · No hosting needed
Add OnlyWorlds to your AI in one minute
Pick your client. Copy, paste, done — or let gate handle sign-ins and policies for you.
claude mcp add --transport http onlyworlds https://www.onlyworlds.com/mcpRun in your terminal, then restart Claude Code.
OnlyWorlds · https://www.onlyworlds.com/mcp
What your AI can do with OnlyWorlds
Real prompts you can type the moment it's connected — no setup, no docs to read.
“Use “list_element_types”: List all 22 OnlyWorlds element types with a one-line shape summary of each. Every world is built from these types; each element has a stabl.”
“Use “get_element_schema”: Return the field structure of one OnlyWorlds element `type` (a slug from `list_element_types`, e.g. "character"). The result groups the typ.”
“Use “search_schema”: Search every element type's fields for `query` (case-insensitive substring), across all 22 types. Useful for "which types have a `location`.”
“Use “list_elements”: List elements of one `type` in the world named by your API-Key header, newest-created first. `type` is a slug from `list_element_types` (e.”
How secure is the OnlyWorlds MCP server?
Every server in the gate directory has to pass the same four checks before your AI can touch it. Here's how OnlyWorlds holds up.
Official endpoint
Operated by OnlyWorlds (onlyworlds.com) at its documented MCP endpoint — not a third-party mirror or community re-host.
No sign-in needed
This server only exposes public data — no account and no credentials are involved when you connect.
Scanned before it goes live
gate checks every tool for prompt injection, hidden instructions, data-exfiltration hints, and over-broad permissions before the server is available through your gateway.
Watched for drift
If OnlyWorlds adds or changes tools later, gate re-scans and alerts you — before your AI acts on the change.
Connected in three steps
Connect your gate
Add one gateway URL to Claude, ChatGPT, or any MCP client. One-time setup, about two minutes.
Pick OnlyWorlds
Choose OnlyWorlds in the gate directory. No sign-in needed.
Use it anywhere
OnlyWorlds's tools are live in every AI client you've connected — with rules and logging built in.
Free to start · No credit card · No hosting needed
The actual tools OnlyWorlds exposes
Fetched live from the official endpoint and re-checked daily by gate — not marketing copy.
list_element_types — List all 22 OnlyWorlds element types with a one-line shape summary of each. Every world is built from these types; each element has a stabl
get_element_schema — Return the field structure of one OnlyWorlds element `type` (a slug from `list_element_types`, e.g. "character"). The result groups the typ
search_schema — Search every element type's fields for `query` (case-insensitive substring), across all 22 types. Useful for "which types have a `location`
list_elements — List elements of one `type` in the world named by your API-Key header, newest-created first. `type` is a slug from `list_element_types` (e.
get_element — Fetch one element by `type` and `id` (a UUID) from the world named by your API-Key header. `type` is a slug from `list_element_types`. Retu
search_elements — Search elements by name across ALL 22 types in the world named by your API-Key header (case-insensitive substring match). Use this when you
get_changes — Return the delta feed for the world named by your API-Key header: every element created/updated (`op: "upsert"`, full body) or deleted (`op:
create_element — Create one new element of `type` in the world named by your API-Key header. `type` is a slug from `list_element_types` (e.g. "character").
+ 3 more tools once connected
Who runs the OnlyWorlds MCP server?
The OnlyWorlds MCP server at a glance
https://www.onlyworlds.com/mcpQuestions, answered
Is there an official OnlyWorlds MCP server?
Yes — OnlyWorlds operates its own remote MCP server at www.onlyworlds.com. gate connects you to that official endpoint and adds security scanning, per-tool access rules, and an activity log on top.
How do I connect OnlyWorlds to Claude or ChatGPT?
Add gate's gateway URL to your AI client once, then pick OnlyWorlds in the directory. No account or sign-in is needed. From then on, OnlyWorlds's tools are available in every client you've connected to gate.
Do I need to host anything?
No. OnlyWorlds runs the server, and gate is fully managed. You just connect one URL — there's nothing to install, deploy, or maintain.
Is the OnlyWorlds MCP server safe to connect?
It's the vendor's official endpoint, and gate scans its tools for prompt injection and hidden instructions before it goes live, re-checks it whenever it changes, and lets you allow, block, or require approval for every single tool.
Is it free?
Yes — you can get started with gate for free and connect OnlyWorlds in minutes. No credit card required.
Connect more than just OnlyWorlds
Every server below works through the same gateway URL — connect once, add tools anytime.
Squarespace DomainsDesignView →Set up OnlyWorlds in: Claude · Claude Code · ChatGPT · Cursor · VS Code