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HerStack MCP Server

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HerStack is listed as active in the registry but did not answer our last check. It exposes 5 tools.

Read-only UK women's midlife health guidance: search, PubMed-backed evidence, Solgar UK picks.

Uptime history 26 days of history · worst day 12%
26 days agonow
27.2%
Uptime 24h
25 of 92 checks
5
Tools
read from the server
734 ms
Response time
average over 24h
open, no key
Access
streamable-http

What changed 10

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 10 September 2026. No other catalogue keeps this.

12 Sep a tool disappeared get_authorised_claims
10 Sep 5 tools appeared get_authorised_claims, get_evidence, get_product_details and 2 more
10 Sep 2 tools disappeared assess_concern, get_cluster_brief
10 Sep a tool description was rewritten recommend_supplements
10 Sep a tool changed the parameters it asks for recommend_supplements

HerStack does not always answer

Over the last week it answered 30.3% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not 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 6 min ago.

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

Available tools 5

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

evidence
get_evidence
Call this when the user (or you) wants the studies behind a recommendation or claim. Returns HerStack's evidence rows for a topic or nutrient with the cited studies resolved to PubMed and DOI identifiers, so the claim can be verified rather than trusted.
guidance
search_guidance
Call this first when a user describes their situation or asks a question in their own words (for example: 'I'm 47, tired all the time and bloated, what should I take?'). Searches all of HerStack's evidence-led guidance for UK women in midlife and returns the most relevant answer units (FAQ answers, research findings, evidence rows, product cards) with their page URLs, the best-matching topic, and that topic's named Solgar UK recommendations, each with its authorised claim.
product
get_product_details
Call this for one specific product. Returns a HerStack-recommended Solgar UK product by name or SKU: form, authorised claim, tier, price, purchase link, and every topic that recommends it with the rationale.
recommend
recommend_supplements
Call this when the user wants specific supplement product picks for a topic. Returns HerStack's named Solgar UK recommendations, each with formulation rationale, the GB-authorised health claim verbatim (or a research-context note where none exists), price and purchase link. Provide a topic, or a concern in plain words that routes to one.
topic
get_topic_guidance
Call this when the user wants to understand a women's-health topic, not only buy something. Returns HerStack's expert guidance for one topic: plain-language framing, research findings, the evidence table with authorised claims, product criteria, and a FAQ that also explains the condition itself (for perimenopause: what it is, its timeline, when to see a GP).

Tools removed

Tools this server used to expose. Anything built against them stopped working on the day they went.

assess_concern
removed 10 Sep 2026
get_cluster_brief
removed 10 Sep 2026
get_authorised_claims
removed 12 Sep 2026

Endpoints

URLTransportStateLatencyChecked
https://herstack.co.uk/api/mcp streamable-http answering 72 ms 6 min ago

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HerStack — questions

Answers built from our own checks of this server.

What can HerStack do?
It exposes 5 tools, read directly from the server on our last check. Among them: get_evidence, get_product_details, get_topic_guidance, recommend_supplements, search_guidance. 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 →
Is HerStack working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 25 of 92 checks got a reply (27.2%), average response time 734 ms. The bar chart above shows every period we have measured.
Did HerStack ever remove tools?
Yes. assess_concern, get_cluster_brief, get_authorised_claims are no longer exposed — we recorded the date each one disappeared. A tool vanishing usually means a breaking change for anything that depended on it.
The registry lists HerStack as active — why does it not respond?
The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.
How do I connect HerStack?
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 HerStack need an API key?
No. HerStack completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 5 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is HerStack?
It answers our handshake in 734 ms on average, which is faster than 16% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.