Gauge

Made by Seaynic Labs. Need tools like this built around your own systems? We do that.

Gauge lets an AI assistant read your website's Umami analytics and send email through Resend, and comes with skills that teach it to do that work well: weekly reports, copy, SEO and email.

It is a bundle: tools, skills and instructions in one install. The tools are one server made of modules. You switch on the modules you use. New modules arrive switched off, so an update never changes what your assistant can do until you choose to.

Security card
Network	Only the services you configure: your Umami address (or api.umami.is) and api.resend.com. Nothing else, no telemetry.
Files	Reads its config file (/.config/gauge/config.toml). Writes one local approval log (/.local/state/gauge/approvals.jsonl).
Secrets	API keys and passwords come from your environment or config file. They are never tool arguments and never returned to the model.
Read-only tools	7: umami_websites, umami_stats, umami_pageviews, umami_metrics, resend_emails, resend_domains, gauge_modules
Needs your approval	resend_send: you approve each send in your app, or pre-approve recipients in settings. The AI cannot approve for you.
Startup cost	about 4,700 tokens (8 tools, 9 skill prompts)
Changes	Tool descriptions are locked by hash (tool-manifest.lock.json); CI fails if they change silently.

Module	What it does	Status
umami	Web analytics from Umami, self-hosted or Umami Cloud: sites, totals, time series, top pages, referrers, countries, browsers	0.1
resend	Email through Resend: send (preview first), list sent mail, list sending domains	0.1

Gauge works with any MCP client: Claude Desktop, Claude Code, Cursor, VS Code, Sonique, Hermes, OpenClaw and others. It runs on your computer and stores nothing; your data stays in Umami and Resend.

Skills

Skills are short guides your assistant reads before doing a job. Gauge ships 9, in two forms from one source: a skills/ folder for apps that read Agent Skills (Claude Code and others), and MCP prompts for every other MCP app.

Skill	What it covers	By
getting-started	Setup, first checks, fixing errors	Seaynic Labs
weekly-site-report	A one-minute weekly traffic report from Umami	Seaynic Labs
analytics, seo-audit, copywriting, emails	Tracking plans, SEO audits, page copy, email sequences	Corey Haines, MIT
resend, email-best-practices, react-email	Sending with Resend, deliverability, HTML email	Resend, MIT

Third-party skills keep their licenses; see CREDITS.md.

Install

Gauge needs Python 3.11 or newer. With uv you don't install anything ahead of time:

uvx gauge-mcp --version
uvx gauge-mcp --doctor          # checks your settings and connections, prints fixes

Pin the exact version if you want updates only when you choose them: uvx gauge-mcp==0.2.1.

Or with pip:

pip install gauge-mcp

As a Claude Code plugin (tools and skills in one step):

/plugin marketplace add seayniclabs/plugins
/plugin install gauge@seayniclabs

Plugin users put settings in ~/.config/gauge/config.toml (below).

Settings

Set these as environment variables in your MCP client's config, or put them in a config file (see below). You only need the settings for the modules you use. Gauge starts without any of them and tells you what's missing when you call a tool.

Variable	Module	What it is
GAUGE_UMAMI_URL	umami	Your Umami address, e.g. https://analytics.example.com
GAUGE_UMAMI_USERNAME / GAUGE_UMAMI_PASSWORD	umami	A self-hosted Umami login. A view-only user is enough.
GAUGE_UMAMI_API_KEY	umami	Umami Cloud API key (instead of a login). GAUGE_UMAMI_URL defaults to Umami Cloud when this is set.
GAUGE_RESEND_API_KEY	resend	Resend API key
GAUGE_RESEND_FROM	resend	Sender address on a domain you verified in Resend
GAUGE_RESEND_FROM_NAME	resend	Optional sender display name
GAUGE_RESEND_ALLOWED_RECIPIENTS	resend	Optional. Comma-separated addresses or @domains the assistant may send to without asking you each time, e.g. [email protected],@example.com
GAUGE_RESEND_REQUIRE_CONFIRM	resend	true by default: you approve each send. false lets the assistant send on its own.
GAUGE_<MODULE>_ENABLED	any	false turns a module off, e.g. GAUGE_RESEND_ENABLED=false

Config file (optional). Gauge also reads ~/.config/gauge/config.toml, or the file named by GAUGE_CONFIG. Environment variables win over the file.

[umami]
url = "https://analytics.example.com"
username = "viewer"
password = "change-me"

[resend]
enabled = false

Add it to your MCP client

Most clients use the same JSON shape. Put it where your client keeps MCP servers:

{
  "mcpServers": {
    "gauge": {
      "command": "uvx",
      "args": ["gauge-mcp"],
      "env": {
        "GAUGE_UMAMI_URL": "https://analytics.example.com",
        "GAUGE_UMAMI_USERNAME": "viewer",
        "GAUGE_UMAMI_PASSWORD": "change-me",
        "GAUGE_RESEND_API_KEY": "re_your_key",
        "GAUGE_RESEND_FROM": "[email protected]"
      }
    }
  }
}

Client	Where the config goes
Claude Desktop	claude_desktop_config.json (Settings → Developer → Edit Config)
Claude Code	claude mcp add gauge -- uvx gauge-mcp, then add the env values, or a project .mcp.json
Cursor	~/.cursor/mcp.json, or .cursor/mcp.json in a project
VS Code	.vscode/mcp.json, using "servers" instead of "mcpServers"
Sonique, Hermes, OpenClaw, others	Any client that launches a stdio MCP server: command uvx, args ["gauge-mcp"], plus the env values

Over HTTP. For clients that connect to a URL instead of launching a process:

gauge-mcp --transport http --port 8765

It serves streamable HTTP at http://127.0.0.1:8765/mcp. It listens only on your own machine by default. Put authentication in front of it before exposing it anywhere else.

Try these

Paste one into your assistant once Gauge is set up:

1. "How did my site do last week compared with the week before?"
2. "Which pages got the most visits this month, and where did those visitors come from?"
3. "Write my weekly site report and draft it as an email to me. Don't send it yet."
4. "Audit the SEO of my top three pages and suggest new titles and descriptions."
5. "Which of my Resend sending domains aren't verified yet, and what do I need to fix?"

Tools

Tool	What it returns
gauge_modules	Which modules are on, which settings are missing, and what each tool does. Call this first.
umami_websites	Tracked websites, paged
umami_stats	Pageviews, visitors, visits, bounces and bounce rate for a date range
umami_pageviews	Pageviews and sessions over time
umami_metrics	A ranked breakdown: type = path (top pages), referrer, country, browser, os, device and more
resend_send	Sends an email after you approve it. Without confirm=true it only returns a preview.
resend_emails	Sent emails, paged with a cursor
resend_domains	Sending domains and whether each is verified

Every tool returns structured data with a published schema, so an assistant can write code against the results instead of reading text. Date ranges take days (default 7) or ISO 8601 start and end. Errors always look like gauge.<module>.<code>: <message> Fix: <hint>.

Safety

• Gauge only calls the services you configure. It sends nothing anywhere else and keeps no data.
• resend_send sends real email, so you approve each one, not the assistant. When the assistant asks to send, Gauge asks you directly through your MCP client (MCP elicitation) and shows the sender, recipients and subject. The assistant can't answer that question for you.
• Some MCP clients can't ask you questions yet. In those, Gauge refuses to send unless you've pre-approved the recipients with GAUGE_RESEND_ALLOWED_RECIPIENTS, or turned approval off with GAUGE_RESEND_REQUIRE_CONFIRM=false.
• Give Gauge the least access it needs: a view-only Umami user, and a Resend key limited to sending if you don't need the other email tools.

Develop

uv venv && uv pip install -e '.[dev]'
.venv/bin/pytest

Security

Report a vulnerability privately through GitHub (Security tab, "Report a vulnerability"). See SECURITY.md. Every send you approve, decline or that gets refused is logged locally in ~/.local/state/gauge/approvals.jsonl (recipients and subject, never the message body). Set GAUGE_APPROVAL_LOG to move it.

License

MIT. Published by Seaynic Labs. Third-party skills are credited in CREDITS.md and keep their own licenses.

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Built by Seaynic Labs. We build tools like this around a business's own systems: local-first, with a person approving every change. See custom integrations.