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Stackhal MCP Server

answering

Stackhal is answering right now. Last checked moments ago. It exposes 13 tools. Last commit 6 Oct 2026.

Outside-in DNS, email security, SEO, GEO and app-link checks plus developer utilities.

Uptime history 8 days of history · worst day 99%
8 days agonow
100.0%
Uptime 24h
92 of 92 checks
13
Tools
read from the server
72 ms
Response time
average over 24h
0
Stars
last commit 6 Oct 2026

What changed 1

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 5 October 2026. No other catalogue keeps this.

5 Oct a tool description was rewritten validate_app_links

What the code does

We read the source, 5 d ago · tools taken from the live server · rules ccca72095570

In the project's build, not in the package

Found in continuous integration, deployment or infrastructure files, or in a neighbouring package of the same monorepo. None of this is installed when you add the server: it describes how the project is built and released. We list it because a leaked key in a build pipeline is still a real problem, but it is not something this server does on your machine.

Touches key and credential files .github/workflows/deploy.yml:39
          ssh-keyscan -H "$SSH_HOST" >> ~/.ssh/known_hosts

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

Stackhal missed one check this week

Everything else answered, so this is steady rather than shaky. We check every 15 minutes, which is how a one-off gets told apart from the start of a pattern, and how you hear about the next one within the hour instead of from your users.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 0 min ago.

run in your terminal
claude mcp add stackhal --transport http https://stackhal.com/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "stackhal": {
      "url": "https://stackhal.com/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.stackhal]
url = "https://stackhal.com/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "stackhal": {
      "url": "https://stackhal.com/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "stackhal": {
      "url": "https://stackhal.com/mcp"
    }
  }
}

Available tools 13

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

generate
generate_apple_pkpass_spec
Generate a production-ready, fully compliant Apple Wallet pass.json specification based on pass type, metadata, colors, barcode, and field values.
generate_favicon_suite
Generate modern multi-platform favicon bundle (adaptive dark-mode SVG, multi-resolution ICO, Apple Touch Icon, Android PWA icons, webmanifest) and minimal HTML tags from SVG or image input.
inspect
inspect_apple_pkpass
Inspect and validate Apple Wallet .pkpass JSON structure (pass.json) or package manifests: checks required keys, pass styles, dates, ISO 8601 timezones, transit types, barcodes, and color contrast.
inspect_domain_security
Inspect domain email security and deliverability standards: DMARC (BIMI compliance), BIMI DNS & SVG reachability, MTA-STS (RFC 8461), SMTP TLS-RPT (RFC 8460), SPF and MX records.
transpile
transpile_regex_engine
Transpile and analyze regular expressions across engines (PCRE, Go RE2, JavaScript, Python re, Rust regex) with compatibility checks and ReDoS safety analysis.
transpile_to_caddyfile
Transpile Nginx (nginx.conf, server blocks) or Apache (.htaccess, VirtualHost) web server configuration to clean, idiomatic Caddyfile with migration advisories.
analyze
analyze_geo_readiness
Analyze Generative Engine Optimization (GEO) signals and AI crawler readiness for a web page (schema, citations, provenance, answer structure, llms.txt, AI bot robots rules).
audit
audit_website_seo
Run a deterministic technical SEO audit for a public website URL. Checks canonicals, title tags, headings, robots.txt, sitemaps, redirects, crawl traps, and indexability.
calculate
calculate_cidr_overlap
Analyze IPv4/IPv6 CIDR subnets for range collisions, full containment, 2D bit-tree matrix partition, and available free subnet allocation.
diagnose
diagnose_cors_policy
Analyze CORS HTTP request and response headers for wildcard/credential security violations, missing Vary: Origin, preflight OPTIONS handling, and header exposure.
repair
repair_apple_pkpass_spec
Automatically repair and sanitize broken Apple Wallet pass.json manifests: fixes missing formatVersion, prefixes passTypeIdentifier, ensures 10-character team ID, normalizes dates to ISO 8601 with timezones, and auto-corrects low contrast.
trace
trace_dns_delegation
Query live DNS records and inspect the authoritative nameservers returned for a domain.
validate
validate_app_links
Inspect and validate Apple App Site Association (apple-app-site-association) and Android Digital Asset Links (assetlinks.json) files, HTTPS hosting rules, and test URL path routing, and compare the origin AASA with the copy on Apple's CDN.

Endpoints

URLTransportStateLatencyChecked
https://stackhal.com/mcp streamable-http answering 73 ms 0 min ago

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Stackhal — questions

Answers built from our own checks of this server.

What can Stackhal do?
It exposes 13 tools, read directly from the server on our last check. Among them: analyze_geo_readiness, audit_website_seo, calculate_cidr_overlap, diagnose_cors_policy, generate_apple_pkpass_spec, generate_favicon_suite and 7 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
What is Stackhal mostly used for?
Its tools cluster around transpile, generate and inspect. That is what this server is built to work with — the grouping comes from the actual tool names, not from a category we assigned.
Is Stackhal working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 72 ms. The bar chart above shows every period we have measured.
How do I connect Stackhal?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Stackhal need an API key?
No. Stackhal completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 13 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Stackhal?
It answers our handshake in 72 ms on average, which is faster than 91% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.
Is Stackhal open source?
Yes — it is published under the MIT licence, written in PHP and 0 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.