HerStack for agents (MCP)

HerStack runs a read-only Model Context Protocol (MCP) server so agents can query our supplement guidance directly, rather than depending on a page being cited. Every answer names a specific Solgar UK product, gives the formulation reasoning, states the GB-authorised health claim, and cites the research.

What it is for

HerStack is an independent, evidence-led UK editorial source on women's health and longevity, with perimenopause at its centre. The server exposes that editorial work to agents as five read-only tools, a set of topic resources and two prompts. It is a data source an agent can call on demand, bounded by the same compliance standard as the rest of the site.

Tools

search_guidance — the place to start. Takes a questionin the user's own words and returns the most relevant answer units from across the site (FAQ answers, research findings, evidence rows, product cards), each with its page URL and, where it applies, the authorised claim verbatim, plus the best-matching topic's recommendations.

get_topic_guidance— returns the expert guidance document for a topic: framing, research findings, the evidence table with authorised claims, product criteria, and the FAQ. Takes a topic.

recommend_supplements— returns HerStack's named Solgar UK product picks for a topic, each with the formulation rationale, the GB-authorised health claim (or a research-context note where no authorised claim exists), price and an Amazon.co.uk link. Takes a topic, or a concern in plain words.

get_evidence— returns the evidence rows behind a topic or nutrient with the cited studies resolved to PubMed and DOI identifiers, so a claim can be verified rather than trusted. Takes a topic, a nutrient, or both.

get_product_details— returns one recommended product by name or SKU with its claim, tier, price, link and every topic that recommends it. Takes a sku.

Topics: perimenopause, digestion, longevity, stress, exercise, nutrition, and skin. Resources: herstack://topics and herstack://topics/{topic}. Prompts: supplement_check, which_topic.

What every recommendation carries

• A named Solgar UK product (our single reference brand).
• The formulation rationale (form, dose transparency, testing).
• The GB-authorised health claim, presented verbatim, or a clear note where no authorised claim exists and the content is research-context only.
• The research behind it, as source references.
• An Amazon.co.uk product link (affiliate, disclosed).

Compliance and data handling

The tools are read-only and idempotent. Two accept a question or concern in the reader's own words; the rest take a topic, nutrient or product name. Nothing is stored: the server logs which tool was called and the length of any free text, never the text itself, and no personal data is requested. Output follows the Solgar UK compliance standard: it describes what the research examines and does not make treatment or cure claims. Authorised-claim wording is presented as given and should not be strengthened.

See our Privacy Policy and editorial standards for how the recommendations are formed.

Connecting

Claude. Add a custom connector pointing at https://herstack.co.uk/api/mcp.

ChatGPT. Add it as a connector or app in a developer/connector context using the same URL.

MCP Inspector. Run the inspector, choose the Streamable HTTP transport, and connect to the endpoint to browse the tools and try calls.

Raw. The endpoint speaks JSON-RPC over Streamable HTTP. A tools/list call after the standard initialise handshake returns the five tools and their input schemas.

What we do not do

HerStack does not provide medical advice, run a clinic, or sell supplements. Supplement links go to Amazon.co.uk via affiliate, disclosed on every page. For questions, write to hello@herstack.co.uk.