What is signupgenius-mcp CLAUDE.md?

A set of Claude Code instructions for developing and configuring the signupgenius-mcp project. The project connects Claude to SignUpGenius, a service for volunteer sign-ups, groups, RSVPs, and event slots.

Use it when working on the signupgenius-mcp codebase, especially its login methods, API calls, sign-up reports, RSVPs, and slot actions. It documents both read and write operations.

It gives coding agents the repository-specific rules needed to understand authentication, environment settings, and available operations. This reduces guesswork when changing or debugging the project.

How chrischall/signupgenius-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to chrischall/signupgenius-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/chrischall/signupgenius-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/chrischall/signupgenius-mcp

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/chrischall/signupgenius-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/chrischall/signupgenius-mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/chrischall/signupgenius-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/chrischall/signupgenius-mcp/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/chrischall/signupgenius-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/chrischall/signupgenius-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 7,929 This file is loaded in full into every session.

When invoked 7,929 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.07929	$0.07929
Opus 5	$0.03964	$0.03964
Sonnet 5	$0.01586	$0.01586
Haiku 4.5	$0.00793	$0.00793

Measured 5d ago against content hash 72da681e3b30, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

signupgenius-mcp CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

CLAUDE.md · 223 lines

How it starts

The opening of the file, as written. The whole thing — 223 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

TL;DR

MCP server for SignUpGenius — 15 read tools + 4 write across profile, groups, sign-ups, reports, public sign-up metadata, slot listings, authenticated RSVPs, and slot claim/release.

Auth resolution lives in src/auth.ts (Pattern A template — see "Auth resolution" below). Three paths, priority order:

SIGNUPGENIUS_USER_KEY → Pro v2/k key mode (the only mode that can call slot reports).
SIGNUPGENIUS_EMAIL + SIGNUPGENIUS_PASSWORD → session-login (form POST → JWT + cfid/cftoken cookies → v3 API + legacy /SUGboxAPI.cfm).
fetchproxy fallback → @fetchproxy/bootstrap reads accessToken (a.k.a. MTOKEN) + cfid + cftoken + refreshToken cookies from the user's signed-in signupgenius.com browser tab, at the www host (the apex exposes only accessToken). The lift runs lazily per login — first request and every expiry — not once at startup, and exchanges a stale JWT via POST /v3/auth/refresh. Between lifts every API call goes out via direct Node fetch() with the cookies attached. Fetchproxy is not in the request hot path.

SIGNUPGENIUS_DISABLE_FETCHPROXY=1 skips path 3 entirely and turns a missing/partial env config into a hard error at tool-call time — useful for headless CI where the browser bridge can't apply.

Environment

No env vars are required — with none set, the server falls through to the fetchproxy browser bridge (path 3). The three auth paths and their env vars are resolved in src/config.ts (loadAccount()) and src/auth.ts (resolveAuth()). All vars pass through readEnvVar from @chrischall/mcp-utils, which treats empty/whitespace, the literal strings "undefined"/"null", and unsubstituted ${...} placeholders as unset (Claude Desktop sometimes emits these for blank user_config refs).

Priority order: key > full session > fetchproxy > error. A SIGNUPGENIUS_USER_KEY always wins; if both key and EMAIL/PASSWORD are present, loadAccount() logs a precedence warning to stderr and uses key mode.

Read the full file on GitHub · 223 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

5d ago Changed · +1 lines · +398 tokens per session 72da681e3b30
9d ago First seen · 222 lines · 7,531 tokens per session scan A 3bc76b546a88

Subscribe to this mod's changes

signupgenius-mcp CLAUDE.md is an instructions file published in the GitHub repository chrischall/signupgenius-mcp (0 stars, last pushed today), licensed MIT. It adds 7,929 tokens to every session, about $0.0396 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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signupgenius-mcp: Instructions file for Claude Code