AllTrails MCP

A Model Context Protocol server that connects Claude to AllTrails, giving you natural-language access to trail search, trail details, reviews, photos, weather, and your own saved lists and hiking history.

[!WARNING] AI-developed project. This codebase was entirely built and is actively maintained by Claude. No human has audited the implementation. Review all code and tool permissions before use.

[!CAUTION] Unofficial and unsupported. AllTrails has no public API. This server reverse-engineers the internal API used by alltrails.com. That API is fronted by DataDome bot protection and governed by AllTrails' Terms of Service. It may break without notice, and automated access may violate their ToS — a prior third-party AllTrails project was disabled at AllTrails' request. Use this only for your own account, at your own discretion.

What you can do

Ask Claude things like:

• "Find waterfall trails near Portland, Oregon"
• "What's the AllTrails rating and length of trail 10236086?"
• "Summarize the recent reviews for this trail"
• "What trails have I marked completed?"
• "Show me the trails on my saved 'weekend hikes' list"

Requirements

• Claude Desktop (or any MCP host)
• Node.js 22.5 or later
• The fetchproxy Transporter browser extension and a signed-in alltrails.com tab (see Authentication)

Acknowledgement of Terms

By using this MCP server, you acknowledge and agree to the following:

1. This server accesses AllTrails using your own signed-in session. It reuses the cookies from your own browser session; it cannot access anyone else's account or private data.

2. AllTrails' Terms of Service govern your use of this server, just as they govern your direct use of AllTrails. AllTrails restricts automated access and scraping, and fronts its API with bot protection. Automated use through this server may breach those terms. You are agreeing to AllTrails' terms every time you invoke a tool.

3. Personal use only. This project is not affiliated with, endorsed by, or sponsored by AllTrails, LLC. It is a personal automation tool. Do not use it to bulk-extract AllTrails' data, to build a competing product, or in any way that burdens their service.

4. You accept full responsibility for any consequences — technical (rate-limiting, CAPTCHA challenges, account action) or otherwise. The maintainer provides no warranty and no support.

This section is the maintainer's good-faith summary — it is not legal advice and does not modify or supersede AllTrails' actual ToS.

Installation

1. Clone and build

git clone https://github.com/chrischall/alltrails-mcp.git
cd alltrails-mcp
npm install
npm run build

2. Add to Claude Desktop

Edit your Claude Desktop config file:

• Mac: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json

Add the alltrails entry inside "mcpServers" (create the key if it doesn't exist):

{
  "mcpServers": {
    "alltrails": {
      "command": "node",
      "args": ["/absolute/path/to/alltrails-mcp/dist/index.js"]
    }
  }
}

Replace /absolute/path/to/alltrails-mcp with the path where you cloned the repo.

3. Restart Claude Desktop

Quit completely (Cmd+Q on Mac, not just close the window) and relaunch.

4. Verify

Ask Claude: "Search AllTrails for trails near me."

Authentication

AllTrails fronts its internal API with DataDome bot protection, and DataDome fingerprints the HTTP client itself — a cookie copied out of the browser and replayed from Node gets rejected even while the browser sails through. So the fetchproxy bridge is required: every API request runs as a same-origin fetch inside your own signed-in alltrails.com tab, reusing your authenticated session. There is no stored-cookie mode.

Requirements: the fetchproxy Transporter extension installed, a signed-in alltrails.com tab open, and a one-time pair-code approval on first use (the trust persists).

The x-at-key app key AllTrails' own client sends is never stored in this repo or your config — the server captures the live value from your tab's own API traffic on first need, keeps it in memory only, and re-captures automatically if AllTrails rotates it. The alltrails_healthcheck tool round-trips a probe through the bridge and tells you which hop broke.

Configuration

Available tools

All tools are read-only — this server never writes to AllTrails.

The per-user tools default to the signed-in user (resolved via /api/alltrails/me or ALLTRAILS_USER_ID); pass userId to target a public profile.

Response shape: view

alltrails_search, alltrails_get_trail, alltrails_get_trail_reviews, alltrails_get_trail_photos, alltrails_get_list_items and alltrails_get_activity_feed take a view parameter with two rungs:

Compact is the default deliberately. These projections existed before, behind compact: false and a tool description asking the caller to please opt in — and an efficiency that has to be requested is one that usually is not. Ask for view: "full" when you need a field the projection drops; the commonest is route geometry from alltrails_get_trail.

view is not detail. alltrails_get_trail also takes detail (basic/medium/offline), and that one is a passthrough to AllTrails — it decides what the API sends us. view decides what this server hands you. Route geometry needs both: detail: "offline" to fetch it and view: "full" to keep it. The collision is exactly why the fleet parameter is named view.

One projection is not a subset: alltrails_get_trail_photos' url is derived by the compact rung (AllTrails' record carries no image URL), so view: "full" does not contain it.

Troubleshooting

403 Forbidden — AllTrails' DataDome protection rejected the request. This usually means the tab isn't signed in (or DataDome is challenging it) — sign into alltrails.com in an open tab and retry.

"AllTrails bridge: …" — the bridge itself failed before reaching AllTrails (extension not running, pairing not approved, no tab). Run alltrails_healthcheck for a diagnosis, and check the Transporter extension popup.

"AllTrails: capturing the x-at-key app key failed…" — the key capture only sees requests your tab itself makes, and an idle tab makes none. Open or refresh a signed-in www.alltrails.com page and retry.

Empty / unexpected results — the internal AllTrails endpoints are undocumented and change over time; responses may shift. Enable ALLTRAILS_DEBUG_LOG=1 to inspect the raw traffic on stderr.

Development

npm test         # run the vitest suite
npm run build    # tsc → dist/, then esbuild bundle → dist/bundle.js
npm run dev      # node --env-file=.env dist/index.js (requires built dist)

vitest.config.ts enforces 100% coverage on src/** (except the stdio entry point). Main is protected — all changes land via PR. See CLAUDE.md for the full PR + release flow.

Project structure

src/
  index.ts          MCP server entry (runMcp + StdioServerTransport)
  protocol.ts       Wire-level constants (BASE_URL, app key, headers)
  transport.ts      createAllTrailsTransport(): the fetchproxy bridge transport
  client.ts         AllTrailsClient — bridge requests, live x-at-key capture, 429 retry
  config.ts         Env parsing (api key, headers, timeout, port, user id, debug)
  validate.ts       parseAllTrails(): zod validation of responses at call sites
  tools/
    _shared.ts      Response helpers + resolveUserId
    trails.ts       get_trail, reviews, photos, weather, gpx export
    explore.ts      search, list by state/country
    user.ts         profile, saved lists, completed trails, activity feed
    healthcheck.ts  alltrails_healthcheck (bridge diagnostics)
tests/              Mirrors src/; mocks AllTrailsClient.request via vi.spyOn

Request flow

Every API request runs as a same-origin fetch inside your signed-in alltrails.com tab, via the fetchproxy bridge (src/transport.ts, the shared createFetchproxyTransport factory). The browser carries its own cookies; the server attaches only the AllTrails protocol headers (x-at-key etc.), which an in-tab fetch doesn't add on its own. There is no Node-direct mode — DataDome fingerprints the HTTP client, so only in-tab requests are reliable.

Also see the fetchproxy README for extension install instructions.

License

MIT