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.
npx skills add chrischall/signupgenius-mcp --skill signupgeniusgit clone --depth 1 https://github.com/chrischall/signupgenius-mcpWrote 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.
[](https://agentmods.dev/skills/chrischall/signupgenius-mcp/signupgenius)<a href="https://agentmods.dev/skills/chrischall/signupgenius-mcp/signupgenius"><img src="https://agentmods.dev/badge/skills/chrischall/signupgenius-mcp/signupgenius/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.
<a href="https://agentmods.dev/skills/chrischall/signupgenius-mcp/signupgenius"><img src="https://agentmods.dev/badge/skills/chrischall/signupgenius-mcp/signupgenius.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00135 | $0.01929 |
| Opus 5 | $0.00068 | $0.00964 |
| Sonnet 5 | $0.00027 | $0.00386 |
| Haiku 4.5 | $0.00014 | $0.00193 |
Grade A, and why
signupgenius 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 11d 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.
How it starts
The opening of the file, as written. The whole thing — 123 lines — stays where its author put it; the contents beside it link to each section on GitHub.
signupgenius-mcp
MCP server for SignUpGenius — 14 read tools + 2 write across profile, groups, sign-ups, and reports.
Setup
Three auth modes, tried in priority order — first match wins. You only need one.
Mode 1 — fetchproxy fallback (zero env vars, recommended)
Install the fetchproxy extension once, sign into signupgenius.com, and add to .mcp.json (project) or ~/.claude/mcp.json (global):
{
"mcpServers": {
"signupgenius": {
"command": "npx",
"args": ["-y", "signupgenius-mcp"]
}
}
}
At startup the MCP reads your accessToken / cfid / cftoken cookies once via the extension, then talks to SignUpGenius directly — the extension is not in the request hot path after that. Works with free accounts.
Mode 2 — session login (email + password)
Add an env block with your direct-login credentials (won't work with Google/Apple/Facebook/Microsoft SSO or 2FA):
{
"mcpServers": {
"signupgenius": {
"command": "npx",
"args": ["-y", "signupgenius-mcp"],
"env": {
"SIGNUPGENIUS_EMAIL": "[email protected]",
"SIGNUPGENIUS_PASSWORD": "your-password"
}
}
}
}
Mode 3 — Pro API key (required for slot reports)
The three signupgenius_report_* tools that list filled / available / all participants for a given sign-up only work against the documented Pro v2 API. Get a key from Pro Tools → API Management in your SignUpGenius dashboard (Pro subscription required), then:
"env": { "SIGNUPGENIUS_USER_KEY": "your-api-key" }
Modes can be combined; Pro key wins where it applies, session/fetchproxy handles everything else.
Tools
Profile
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.
- 11d ago First seen · 123 lines · 135 tokens per session scan A a4332a38b98a
signupgenius is a skill published in the GitHub repository chrischall/signupgenius-mcp (0 stars, last pushed 2d ago), licensed MIT. It adds 135 tokens to every session and 1,929 once invoked, about $0.0007 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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