Signupgenius MCP README
The full upstream README, mirrored here for reference. Install config, tool schemas, adoption signals, and an original overview live on the Signupgenius MCP listing page.
signupgenius-mcp
MCP server for SignUpGenius. 15 read tools and 4 write across profile, groups, sign-ups, reports, public sign-up metadata, slot listings, RSVPs, and slot claim/release.
Reading a sign-up needs no credentials at all: signupgenius_get_public_signup (title, description, organizer, required questions) and signupgenius_list_slots (dates, times, locations, capacity, who has signed up and how many spots each entry takes) work on any public sheet, including ones you did not create. The two slot writes — signupgenius_claim_slot and signupgenius_release_slot — need a signed-in session and both require an explicit confirm: true, returning a dry-run preview otherwise.
Three auth modes (tried in this priority order — first match wins):
- Pro key mode. Uses the documented Pro API key. Required only for the slot REPORT tools (filled/available/all-participants). Pro subscription needed.
- Session mode. Logs in with your normal email/password to call the same web API the signupgenius.com dashboard uses. Free accounts work. No SSO/2FA.
- fetchproxy fallback (no env vars needed). When no env vars are set, the server reads
accessToken/cfid/cftokencookies once at startup from your already-signed-insignupgenius.comtab via the fetchproxy browser extension. After that one read, all SignUpGenius API calls go directly from Node — the extension is not in the request hot path. Install the extension once, sign into SignUpGenius, and the MCP just works.
Set SIGNUPGENIUS_DISABLE_FETCHPROXY=1 to opt out of the fallback (turns missing credentials into a hard error — useful in headless CI).
Tools
| Domain | Tools | Mode |
|---|---|---|
| Profile | signupgenius_get_profile | both |
| Groups | signupgenius_list_groups, signupgenius_list_group_members, signupgenius_get_group_member, signupgenius_add_group_member (write) | both |
| Sign-ups | signupgenius_list_created_active, _expired, _all, signupgenius_list_invited, signupgenius_list_signedupfor | both |
| Sign-ups (extras) | signupgenius_legacy_get_my_signups | session only |
| Reports | signupgenius_report_all, signupgenius_report_filled, signupgenius_report_available | key only |
Notes on session-mode sign-up listings: the v3 endpoints signups/created, signups/invited, and signups/signedupfor return the full list in one paginated call (no separate active/expired URLs). The three signupgenius_list_created_* tools all map to the same endpoint in session mode; filter by enddate client-side. The bonus signupgenius_legacy_get_my_signups calls the same backend the SignUpGenius wizard itself uses and sometimes returns fuller data.
Reports outside key mode fail fast with a KeyModeRequiredError naming the tool, the mode required and the mode in effect, telling the user to set SIGNUPGENIUS_USER_KEY — and pointing at signupgenius_list_slots, which answers slot availability for any sheet with no auth at all.
Configuration
Session mode (recommended)
The server logs into signupgenius.com on first request, caches the JWT and session cookies, and silently re-logs in on a 401. Treat .env like a password file — it's gitignored here, do not commit.
Direct email/password accounts only. Won't work with Google/Apple/Facebook/Microsoft SSO or 2FA, same caveat as similar sibling MCPs.
Key mode (Pro only)
Find the user key in SignUpGenius under Pro Tools → API Management.
fetchproxy fallback (no env vars)
Install the fetchproxy extension (Chrome Web Store / Safari .dmg), sign into signupgenius.com, and remove the env block from your MCP config. The MCP reads accessToken / cfid / cftoken cookies once at startup and uses them like a session-mode login. No password copy-paste required.
The slot REPORT tools still require Pro key mode — SIGNUPGENIUS_USER_KEY is the only path that hits the documented v2/k Pro API. They are also owner-scoped, so they only answer for sheets the key holder created; for availability and participants on anyone's sheet use signupgenius_list_slots, which needs no auth.
Both at once
Set both Pro key and email/password. Key mode wins. Useful if you have Pro for some accounts and want reports while still using your normal login elsewhere.
Advanced overrides
| Env var | Default | Purpose |
|---|---|---|
SIGNUPGENIUS_BASE_URL | key: https://api.signupgenius.com/v2/ksession: https://api.signupgenius.com/v3 | Override the JSON API base. |
SIGNUPGENIUS_LEGACY_BASE_URL | https://www.signupgenius.com | Override the host for /SUGboxAPI.cfm?go=… legacy calls. |
SIGNUPGENIUS_LOGIN_URL | https://www.signupgenius.com | Override the login form host. |
SIGNUPGENIUS_DISABLE_FETCHPROXY | unset | Set to 1 to skip the fetchproxy fallback (missing creds become a hard error). |
ToS caveat
SignUpGenius's terms generally prohibit scripted/automated access. Session mode is "your own account, your own risk" — fine for personal automation but not something you should run at scale or on accounts you don't own.
Local dev
Point an MCP host at dist/bundle.js with the env vars above, or run npm run dev after creating a .env.
Tests: vitest, 100% line/branch/function coverage. End-to-end tests against the SignUpGenius API are not in CI by design — running them requires real credentials.
Notes
- The Pro v2/k API authenticates via a
user_keyquery param. The session API uses a JWT Bearer + session cookie. The client picks the right one based on which env vars you set. - All response envelopes are normalized to
{ data, message, success }(lowercase) regardless of which surface served the request — the legacy SUGboxAPI dispatcher's uppercase envelope is rewritten internally. - For testing the Pro v2/k surface without an account, SignUpGenius publishes a frozen demo key:
V0FzMkxZcmVOZlVnclZMVEl6dGhWQT09.
Developed and maintained by AI (Claude). Use at your own discretion.
Acknowledgement of Terms
By using this MCP server, you acknowledge and agree to the following:
1. This server accesses your own SignUpGenius account. Auth happens via your own credentials. It does not — and cannot — access anyone else's account or signups.
2. SignUpGenius's Terms of Service govern your use of this server, just as they govern your direct use of signupgenius.com. The clauses most relevant here:
Users may not bypass any robot exclusion headers or other measures we take to restrict access to the Services or use any software, technology, or device to scrape, spider, or crawl the Services.
And: "You are responsible for maintaining the confidentiality of your account user name and password… You agree to accept responsibility for any and all activities or actions that occur in connection with your User Credentials."
You are agreeing to those terms — read by the maintainer 2026-05-23 — every time you invoke a tool in this server. Notably, SignUpGenius does offer an official API for paid plans; where possible, prefer the official API over the endpoints this MCP exercises.
3. Personal, organizer/participant use only. This project is not affiliated with, endorsed by, sponsored by, or in partnership with SignUpGenius, Inc. It is a personal automation tool for an authenticated user to manage their own signups and groups. Do not use it to scrape other organizers' signups, spam participants, or bulk-add fake group members.
4. Stability is not guaranteed. This server may call internal endpoints that SignUpGenius can change without notice. If a tool here breaks, the canonical fix is to use the official API where available.
5. You accept full responsibility for any consequences of using this server in connection with your SignUpGenius account — rate limiting, account warnings, suspension, or any enforcement action. Per the ToS, everything done under your credentials is attributed to you. If SignUpGenius objects to your use, stop using this server.
This section is the maintainer's good-faith summary of the terms — it is not legal advice and does not modify or supersede SignUpGenius's actual ToS.