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Fantasy Tabletop Helper MCP Server

Fantasy Tabletop Helper — MCP server

Connect Claude Desktop, Cursor, Codex, or any MCP-capable client to your tabletop campaigns, and ask questions about your own world in plain language.

"Which NPCs in Westruun belong to a religion, and which of them have my party already met?"

This repository holds the connection docs and example client configs. The server itself is hosted — it runs inside fantasytabletophelper.com, so there is nothing to install, clone, or keep running.

  • Endpoint: https://www.fantasytabletophelper.com/api/mcp — keep the www., see below

  • Transport: stateless Streamable HTTP, POST only

  • Access: Hero plan + PAT (ftth_mcp_…). Reads plus controlled writes (proposals / notes / events you authored). Not OAuth — that is a separate issue.

  • Source: closed. The app is a commercial product; this repo is the client-side half.


Scoped to you (reads + controlled writes)

The server queries the database as you, not as an administrator. Row-level security decides the answer, so it can only ever show what the website would show you when logged in.

Writes exist, and they are bounded: notes and events you authored, recaps you submit, and proposals for the DM to review. Nothing an AI tool does through this connection becomes campaign canon until a DM reviews it in the app.

Who sees it

Party notes

Campaign members

DM-only notes

The DM of that campaign, or whoever wrote them

Private notes

Only their author

Codex entries

Members of that campaign; non-canon entries only for the DM

If you are a player, pointing an AI client at your campaign cannot surface your DM's secrets. That is enforced in the database, not in application code.

Related MCP server: World Anvil MCP Server

Tools

Tool

Returns

list_campaigns

Your campaigns, and your role in each

get_campaign

One campaign's details

list_sessions

Sessions, most recently played first

search_codex

NPCs, locations, items, lore, religions, cultures, groups

get_subject

One codex entry in full, with its relationships

get_session_notes

Notes from a single session

get_session_recap

Session recap — plus DM prep hooks if you are the DM

append_session_note

Add a note (visibility required)

submit_session_recap

Save a recap you wrote

propose_subject

Propose a codex entry for the DM to review

propose_relationship

Propose a link between two existing entries

list_session_events

Rolls and combat events you may read

append_session_event

Append one typed event (roll / hit / heal…)

get_session_transcript

Latest ready transcript — DM only, never the audio

Factions and guilds are stored as kind: "group" — there is no separate faction kind.


Setup

1. Create a token

On the site, go to Account → AI Tool Access (/account/mcp), name the token after the tool you are connecting, and press Create token.

The token appears once, beginning ftth_mcp_. Copy it then. Only a hash is stored, so it cannot be shown again. If you lose one, revoke it and make another.

2. Configure your client

Ready-to-edit files are in examples/. Claude Desktop, for instance:

{
  "mcpServers": {
    "ftthelper": {
      "url": "https://www.fantasytabletophelper.com/api/mcp",
      "headers": { "Authorization": "Bearer ftth_mcp_YOUR_TOKEN_HERE" }
    }
  }
}

Restart the client. ftthelper should appear in its tool list.

Keep the www.

It is not cosmetic. The bare domain redirects to www, and HTTP clients drop the Authorization header whenever a redirect changes origin — sensibly, since they cannot know the new host deserves your credentials. Point a client at https://fantasytabletophelper.com/api/mcp and the token is stripped in transit, so the server sees an anonymous request and answers 401 Invalid or missing MCP token for a perfectly good token.

3. Ask it something

"List my campaigns, then find every religion in the Westruun one."


Revoking a token

Press Revoke next to it on Account → AI Tool Access. It takes effect on that client's next request. Revoke any token you have pasted somewhere you no longer control.

Troubleshooting

Symptom

Cause

404

Wrong path, or the server is switched off on this deployment.

401 on a token you just made

Almost always the URL: the bare domain instead of www., which strips the token. Check that before suspecting the token.

401

Token is wrong, revoked, or expired. Make a new one.

503

We could not open a session for your account. Usually transient; retry.

403

Your plan is not Hero.

429

Soft rate limit (~60 requests/min per token). Wait for Retry-After.

405 on a GET

Expected. The server is POST-only; your client should be using POST.

Connects, but every tool call returns an error

A server-side configuration problem. Contact support — the server logs these.

A tool returns an empty list

Usually genuine: you have no campaigns yet, or the search matched nothing.

The last two rows are worth keeping apart. An empty list is an answer; an error is a fault.

Licence

Docs and example configs: MIT. The hosted service has its own terms.

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