plausible-whenever-mcp

The Plausible Analytics MCP server that finally understands "yesterday".

A local Model Context Protocol server that gives an AI assistant full read access to your Plausible data — and, crucially, resolves natural-language dates (yesterday, last week, last 30 days, 3 days ago…) in your site's own timezone. So prompts like "analyze yesterday's traffic" just work, even with small local LLMs.

Why this exists

The Plausible Stats API has presets like day, 7d and month, but no "yesterday" — and to query a specific past day you must send explicit YYYY-MM-DD dates. LLMs (especially smaller local models) routinely get this wrong because they don't reliably know today's date or your site's timezone. The result: "yesterday" silently returns the wrong range, or the model burns turns guessing date formats (/, .., YYYYMMDD, date vs date_range…) and gives up.

This server moves all of that to the server side. The model says date_range: "yesterday"; the server computes the exact dates in your site's timezone before calling Plausible. There is no tool where the model must know Plausible's native date format — and if it ever passes something unrecognizable, the error message lists exactly what's accepted.

Related MCP server: Umami MCP Server

Features

• 🗓️ Natural-language dates resolved in the site timezone — keywords, synonyms, N days ago, last N days/weeks/months, single dates, and ranges with , .. / or to separators.

• 🧰 8 tools covering the full read API: sites, realtime, aggregates, time series, breakdowns, period comparison, plus a raw query escape hatch — and all of them resolve friendly dates.

• 🏠 Self-hosted friendly — works against any Plausible instance via PLAUSIBLE_BASE_URL, with a PLAUSIBLE_TIMEZONE override for instances where the Sites API (timezone auto-detect) is disabled.

• 🤖 Tuned for local LLMs — forgiving inputs, self-explaining errors, and clean tool output (no HTML dumps).

• 🔒 Read-only — every tool only ever reads your analytics.

Tools

Date expressions accepted everywhere

• Keywords (resolved in the site timezone): today, yesterday, this_week, last_week, this_month, last_month, this_year, last_year, last_7_days, last_30_days, last_90_days, last_12_months

• Natural phrasing & synonyms: 3 days ago, day before yesterday, last 14 days, last 6 months, previous month, the last week, ytd, mtd, all time, …

• Plausible presets: day, 7d, 30d, month, 6mo, 12mo, year, all

• A single date: 2024-03-15 → that one day

• An explicit range (any separator): 2024-01-01,2024-01-31, 2024-01-01..2024-01-31, 2024-01-01/2024-01-31, 2024-01-01 to 2024-01-31

Install

Requires Node.js ≥ 18 and a Plausible Stats API key (Plausible dashboard → Settings → API Keys; on self-hosted: <your-instance>/settings/api-keys).

git clone https://github.com/Schneckenhausmann/plausible-whenever-mcp.git
cd plausible-whenever-mcp
npm install
npm run build

Configure

Set environment variables (see .env.example):

Connect to Claude Desktop

~/Library/Application Support/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "plausible": {
      "command": "node",
      "args": ["/absolute/path/to/plausible-whenever-mcp/dist/index.js"],
      "env": {
        "PLAUSIBLE_API_KEY": "your-key",
        "PLAUSIBLE_DEFAULT_SITE_ID": "example.com"
      }
    }
  }
}

For a self-hosted instance, add PLAUSIBLE_BASE_URL and PLAUSIBLE_TIMEZONE:

{
  "mcpServers": {
    "plausible": {
      "command": "node",
      "args": ["/absolute/path/to/plausible-whenever-mcp/dist/index.js"],
      "env": {
        "PLAUSIBLE_API_KEY": "your-key",
        "PLAUSIBLE_BASE_URL": "https://analytics.example.com",
        "PLAUSIBLE_DEFAULT_SITE_ID": "example.com",
        "PLAUSIBLE_TIMEZONE": "Europe/Berlin"
      }
    }
  }
}

Connect to Claude Code

claude mcp add plausible \
  --env PLAUSIBLE_API_KEY=your-key \
  --env PLAUSIBLE_DEFAULT_SITE_ID=example.com \
  -- node /absolute/path/to/plausible-whenever-mcp/dist/index.js

Example prompts that just work

• "Look at yesterday's data for example.com and analyze it."

• "Top 10 pages last week vs the week before."

• "Show the hourly visitor trend for yesterday — we had a spike in the morning."

• "Which countries drove the most traffic last month?"

Self-hosted note

On Plausible Community Edition the Sites API (/api/v1/sites) is often disabled, so:

• list_sites will report sites_api_available: false and point at your configured default — this is expected and does not affect any stats queries.

• Timezones can't be auto-detected, so set PLAUSIBLE_TIMEZONE to keep relative dates correct.

Develop

npm run build      # compile TypeScript -> dist/
npm run dev        # tsc --watch
npm test           # build + run the date-resolver test suite
npm run inspector  # open the MCP Inspector against the server

Acknowledgments

Built fresh, but inspired by two excellent MIT-licensed projects — thank you to their authors:

• Defilan/plausible-mcp by Defilan — clean stdio tool surface.

• getsentry/plausible-mcp by Sergiy Dybskiy — per-tool architecture and the period-comparison idea.

Full third-party license notices are in CREDITS.md.

License

MIT © 2026 Nikias Herzhauser