signupgenius-api

signupgenius-api is a skill for Claude Code from chrischall/signupgenius-mcp. It costs 96 tokens per session (1,478 once invoked), scanned A, original, MIT.

A collection of shell commands for accessing SignUpGenius, a service for organizing volunteer shifts, event sign-ups, and RSVPs, with curl. It logs in directly and then calls the service's APIs.

In plain words
What is it for?
Use it to query sign-ups, groups, RSVPs, and related information from shell scripts. It requires email-and-password login and does not support SSO or two-factor-authenticated accounts.
Why use it?
It lets you retrieve SignUpGenius data from scripts or a terminal without running the MCP server, browser, or extension. It also documents the login cookies and session needed for requests.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: positional $N argument.

Part of the signupgenius-mcp plugin — 2 skills, 1 MCP server shipped together

Good fit Use it to query sign-ups, groups, RSVPs, and related information from shell scripts. It requires email-and-password login and does not support SSO or two-factor-authenticated accounts.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/chrischall/signupgenius-mcp/signupgenius-api
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add chrischall/signupgenius-mcp --skill signupgenius-api
Clone the repo
git clone --depth 1 https://github.com/chrischall/signupgenius-mcp

Made for: Claude Code.

Or install signupgenius-mcp, the plugin that ships this one along with the rest of its 2 skills, 1 MCP server.

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.

agentmods badge for signupgenius-api

README.md
[![agentmods](https://agentmods.dev/badge/skills/chrischall/signupgenius-mcp/signupgenius-api/github.svg)](https://agentmods.dev/skills/chrischall/signupgenius-mcp/signupgenius-api)
Your own site
<a href="https://agentmods.dev/skills/chrischall/signupgenius-mcp/signupgenius-api"><img src="https://agentmods.dev/badge/skills/chrischall/signupgenius-mcp/signupgenius-api/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.

agentmods 80×15 button for signupgenius-api

Your own site · 80×15
<a href="https://agentmods.dev/skills/chrischall/signupgenius-mcp/signupgenius-api"><img src="https://agentmods.dev/badge/skills/chrischall/signupgenius-mcp/signupgenius-api.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 96 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,478 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00096 $0.01478
Opus 5 $0.00048 $0.00739
Sonnet 5 $0.00019 $0.00296
Haiku 4.5 $0.00010 $0.00148

Measured 10d ago against content hash 483b78cde490, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

signupgenius-api scanned grade A with 1 finding 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 10d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

description: "Access SignUpGenius (sign-ups, groups, RSVPs) from a shell with curl instead of running the signupgenius-mcp server — server-side email/password login to a JWT + cfid/cftoken cookies, then curl the v3 API a
skills/signupgenius-api/SKILL.md · 125 lines

How it starts

The opening of the file, as written. The whole thing — 125 lines — stays where its author put it; the contents beside it link to each section on GitHub.

SignUpGenius via curl (no MCP)

SignUpGenius's session mode is a classic ColdFusion login: POST email+password to the login form, get back a accessToken JWT cookie plus cfid/cftoken session cookies. No browser or extension needed — everything here is a plain curl call. This is the same auth path signupgenius-mcp uses in session mode (src/auth-session-login.ts); its fetchproxy path (lifting the same cookies out of a signed-in browser tab) is only a fallback for when you don't want to put a password in .env — this skill always logs in directly.

One-time setup

export SIGNUPGENIUS_EMAIL="[email protected]"
export SIGNUPGENIUS_PASSWORD="..."
# or: export SIGNUPGENIUS_PASSWORD="$(op read 'op://Private/SignUpGenius/password')"

SSO accounts (Google/Apple/Facebook/Microsoft) and 2FA-enabled accounts can't use this flow — same limitation as the MCP's session mode.

Log in: get the JWT + cookies

COOKIEJAR=$(mktemp)

CSRF=$(curl -s -c "$COOKIEJAR" https://www.signupgenius.com/login \
  | grep -oE 'name="csrfToken"[[:space:]]+value="[^"]+"' \
  | sed -E 's/.*value="([^"]+)".*/\1/')

curl -s -D /tmp/sug-login-headers.txt -o /dev/null \
  -b "$COOKIEJAR" -c "$COOKIEJAR" \
  -A 'Mozilla/5.0 (Macintosh; Intel Mac OS X 14_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0 Safari/537.36' \
  -X POST 'https://www.signupgenius.com/index.cfm?go=c.Login' \
  --data-urlencode "csrfToken=$CSRF" \
  --data-urlencode "loginemail=$SIGNUPGENIUS_EMAIL" \
  --data-urlencode "pword=$SIGNUPGENIUS_PASSWORD" \
  --data-urlencode "successpage=c.jump&jump=/index.cfm?go=c.MyAccount" \
  --data-urlencode "failpage=c.Register" \
  --data-urlencode "ScreenWidth=2000" \
  --data-urlencode "ScreenHeight=1200" \
  --data-urlencode "formaction=1" \
  --data-urlencode "formName=loginform" \
  --data-urlencode "refererUrl="

# Bad credentials 302 to c.Register instead of setting accessToken — check both:
grep -q 'c.Register' /tmp/sug-login-headers.txt && echo "LOGIN FAILED (bad credentials)" >&2

ACCESS_TOKEN=$(awk -F'\t' '$6=="accessToken"{print $7}' "$COOKIEJAR")
CFID=$(awk -F'\t' '$6=="cfid"{print $7}' "$COOKIEJAR")
CFTOKEN=$(awk -F'\t' '$6=="cftoken"{print $7}' "$COOKIEJAR")
[ -z "$ACCESS_TOKEN" ] && echo "LOGIN FAILED (no accessToken cookie set)" >&2
COOKIE_HEADER="accessToken=${ACCESS_TOKEN}; cfid=${CFID}; cftoken=${CFTOKEN}"

Read the full file on GitHub · 125 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

  1. 10d ago First seen · 125 lines · 96 tokens per session scan A 483b78cde490

Subscribe to this mod's changes

signupgenius-api is a skill published in the GitHub repository chrischall/signupgenius-mcp (0 stars, last pushed yesterday), licensed MIT. It adds 96 tokens to every session and 1,478 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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