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/alltrails-mcp --skill alltrailsgit clone --depth 1 https://github.com/chrischall/alltrails-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/alltrails-mcp/alltrails)<a href="https://agentmods.dev/skills/chrischall/alltrails-mcp/alltrails"><img src="https://agentmods.dev/badge/skills/chrischall/alltrails-mcp/alltrails/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/alltrails-mcp/alltrails"><img src="https://agentmods.dev/badge/skills/chrischall/alltrails-mcp/alltrails.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 | $0.00085 | $0.01979 |
| Opus 5 | $0.00043 | $0.00989 |
| Sonnet 5 | $0.00017 | $0.00396 |
| Haiku 4.5 | $0.00009 | $0.00198 |
Grade A, and why
alltrails 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 4d 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 — 101 lines — stays where its author put it; the contents beside it link to each section on GitHub.
alltrails-mcp
Unofficial MCP server for AllTrails — read-only access to trail search, details, reviews, photos, weather, and a signed-in user's saved lists / completed trails / activity feed.
⚠️ AllTrails has no public API. This server reverse-engineers the internal one used by alltrails.com, which is fronted by DataDome bot protection and governed by AllTrails' Terms of Service. It may break at any time, and automated use may violate their ToS. Use at your own discretion for your own account.
Setup
Add to .mcp.json in your project or ~/.claude/mcp.json:
{
"mcpServers": {
"alltrails": {
"command": "npx",
"args": ["-y", "alltrails-mcp"]
}
}
}
Every API request routes through the fetchproxy browser bridge — it runs as a same-origin fetch inside your signed-in alltrails.com tab (DataDome fingerprints Node-originated requests, so 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 x-at-key app key is never stored in code or config — it is captured live from the tab's own API traffic and held in memory only.
Tools
view — slim by default
Every tool marked view? below answers in one of two shapes, and the cheap one
is what you get for free:
view: "compact"(the default) — a slim projection of just the fields you act on. Each tool's row says exactly which.view: "full"— AllTrails' whole untouched record.
You do not pass anything to get the compact answer. Reach for view: "full"
only when you need a field the projection drops — most often route geometry
from alltrails_get_trail.
view is not detail. alltrails_get_trail also takes a detail
(basic/medium/offline) argument, and that one is forwarded to AllTrails —
it decides what the API sends us. view decides what we hand back to you.
Full route geometry needs both: detail: "offline" to fetch it and
view: "full" to keep it.
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.
- 4d ago Changed · +19 lines 57f12768a7a8
- 9d ago First seen · 82 lines · 85 tokens per session scan A d7361d3541e5
alltrails is a skill published in the GitHub repository chrischall/alltrails-mcp (0 stars, last pushed today), licensed MIT. It adds 85 tokens to every session and 1,979 once invoked, about $0.0004 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.
Other skills, from other repositories
systematic-debugging
Use when encountering any bug, test failure, or unexpected behavior, before proposing fixes.
local-ai-agents
Build local-first AI agents that run entirely on a developer workstation with Microsoft Foundry Local and Qwen function-calling models. Covers Small Language Models (SLMs), the OpenAI-compatible local endpoint, sandboxed local tools, local RAG with Chroma, local MCP servers, hybrid cloud/local routing, and the…
next-cache-components-adoption
Turn on Cache Components in a Next.js app and resolve the blocking routes it surfaces. Use when the user wants to enable, adopt, or migrate to Cache Components, flip the cacheComponents flag, work through a flood of blocking-prerender / instant validation errors, run the cache-components-instant-false codemod, or…
insight-error-page
Write or audit an insight-kind error page for the Next.js dev overlay. Use when creating a new errors/ .mdx page, auditing an existing one, or checking that a page matches the framework fix cards. Covers page structure, title alignment, FixCard cards with Copy prompt button, code snippets, terminology verification…
next-cache-components-optimizer
Drive a Next.js route to instant navigation by setting up an agentic loop, under Cache Components / PPR, on initial load (hard navigation) and client-side navigation (soft navigation). Encode the goal as a failing @next/playwright instant() e2e and work it to green, one verified route at a time; the shipped test then…
next-partial-prefetching-adoption
Turn on Partial Prefetching in a Next.js app and work through the insights it surfaces. Use when the user wants to enable or adopt Partial Prefetching, flip the partialPrefetching flag, opt routes in with export const prefetch = 'partial', audit Link prefetch={true} behavior, preserve existing prefetched UI with…