HerStack
REMOTE · HERSTACK.CO.UK
Read-only UK women's midlife health guidance: search, PubMed-backed evidence, supplement picks.
Available components
Last scanned (23 hours ago)
Scores higher than 98% of remote servers
Reachable. Last reached 4 Nov 2026.
Category Health and Science
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security80
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability88
- 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).Pass
- AI-judged instruction clarity (excellent).Pass
- Tool/resource definitions use about 1084 tokens (~83/item across 13 items; 5 tools + 8 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 5 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 7 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 17 Oct 26 0
- Tool “search_guidance” rewrote its description, which is the text the model reads security
- 11 Oct 26 +10
- Stability: fail → pass ▲ security
- 29 Sept 26 0
- The server rewrote its instructions, which are the text every model session reads security
- Tool “get_product_details” rewrote its description, which is the text the model reads security
- Tool “recommend_supplements” rewrote its description, which is the text the model reads security
- Tool “search_guidance” rewrote its description, which is the text the model reads security
- 28 Sept 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 25 Sept 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 11 Sept 26 0
- Tool “get_authorised_claims” was removed ▼ security
- The server rewrote its instructions, which are the text every model session reads security
- Schema quality: 1161 → 1032 ▲ functional
- Server version: 1.1.0 → 1.2.0 functional
- 10 Sept 26 0
- Stability: 0.53 → fail ▼ security
- Tool “assess_concern” was removed ▼ security
- Tool “get_cluster_brief” was removed ▼ security
- The server rewrote its instructions, which are the text every model session reads security
- Tool “recommend_supplements” rewrote its description, which is the text the model reads security
- Schema quality: fail → pass ▲ functional
- The server now declares the “prompts” capability functional
- The server now declares the “resources” capability functional
- First check of Schema quality: 100 functional
- New prompt “supplement_check” functional
- New prompt “which_topic” functional
- New resource “topic-guidance-digestion” functional
- New resource “topic-guidance-exercise” functional
- New resource “topic-guidance-longevity” functional
- New resource “topic-guidance-nutrition” functional
- New resource “topic-guidance-perimenopause” functional
- New resource “topic-guidance-skin” functional
- New resource “topic-guidance-stress” functional
- New resource “topics-index” functional
- Server version: 0.1.0 → 1.1.0 functional
- New tool “get_authorised_claims” functional
- New tool “get_evidence” functional
- New tool “get_product_details” functional
- New tool “get_topic_guidance” functional
- New tool “search_guidance” functional
- “recommend_supplements” added an optional parameter “topic” cosmetic
- “recommend_supplements” reworded the description of “concern” cosmetic
- “recommend_supplements” dropped the optional parameter “cluster” cosmetic
- 26 Aug 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 4 Nov 2026 · Probed https://herstack.co.uk/api/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=herstack.co.uk | CN=YR2,O=Let's Encrypt,C=US | 3 Nov 2026 | 1 Feb 2027 | RSA 2048 | SHA256-RSA | 5bfce4b95681908e63bde4e207b8ea9d1ec |
| SANs: herstack.co.uk | ||||||
| CN=YR2,O=Let's Encrypt,C=US (CA) | CN=Root YR,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | RSA 2048 | SHA256-RSA | 4ebd24947e24d394802d84a52fd5b319 |
| CN=Root YR,O=ISRG,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | RSA 4096 | SHA256-RSA | f24b6d17f9d9ad7cb1c9fea78782699f |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of herstack.co.uk. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| uk. | present | 43876 | 8 | Verified |
| co.uk. | present | 11810 | 8 | Verified |
| herstack.co.uk. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=63072000 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://herstack.co.uk/api/mcp | Verified | 200 | |
| http (plaintext) | http://herstack.co.uk/api/mcp | HTTPS enforced | 308 | https://herstack.co.uk/api/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
get_evidence Get evidence ~111
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.
| Name | Type | Req | Description |
|---|---|---|---|
| nutrient | string | – | A nutrient or ingredient, e.g. 'magnesium', 'collagen', 'vitamin d'. |
| topic | string | – | Topic: perimenopause, digestion, longevity, stress, exercise, nutrition, skin. |
No output schema declared.
No examples provided.
get_product_details Get product details ~69
Call this for one specific product. Returns one HerStack-recommended product by name or SKU: form, authorised claim, tier, price, purchase link, and every topic that recommends it with the rationale.
| Name | Type | Req | Description |
|---|---|---|---|
| sku | string | yes | Product name or SKU, e.g. 'Chelated Magnesium'. |
No output schema declared.
No examples provided.
get_topic_guidance Get topic guidance ~107
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).
| Name | Type | Req | Description |
|---|---|---|---|
| topic | string | yes | Topic: perimenopause, digestion, longevity, stress, exercise, nutrition, skin. |
No output schema declared.
No examples provided.
recommend_supplements Recommend supplements ~131
Call this when the user wants specific supplement product picks for a topic. Returns HerStack's named product recommendations from the site's reference brand, 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.
| Name | Type | Req | Description |
|---|---|---|---|
| concern | string | – | The user's concern in plain words, if you do not know the topic (or use search_guidance). |
| topic | string | – | Topic: perimenopause, digestion, longevity, stress, exercise, nutrition, skin. |
No output schema declared.
No examples provided.
search_guidance Search guidance ~165
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, and three-day meal plans and recipes for women in perimenopause and after menopause) with their page URLs, the best-matching topic, and that topic's named product recommendations from the site's reference brand, each with its authorised claim.
| Name | Type | Req | Description |
|---|---|---|---|
| maxResults | integer | – | How many answer units to return (default 6). |
| question | string | yes | The user's question or situation, in their words. |
No output schema declared.
No examples provided.
How do I install the HerStack MCP server?
HerStack is a hosted endpoint at https://herstack.co.uk/api/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · herstack.co.uk
claude mcp add --transport http uk-co-herstack-herstack 'https://herstack.co.uk/api/mcp'
What is the HerStack MCP server?
HerStack is an MCP server listed in the public MCP registry as uk.co.herstack/herstack. Read-only UK women's midlife health guidance: search, PubMed-backed evidence, supplement picks. This page covers its hosted endpoint (https://herstack.co.uk/api/mcp).
Is the HerStack MCP server safe to use?
HerStack scores 90 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the HerStack MCP server expose?
HerStack exposes 5 tools: search_guidance, get_topic_guidance, recommend_supplements, get_evidence, get_product_details. Their descriptions and schemas cost roughly 583 tokens of context every time the server is loaded.
Does the HerStack MCP server require authentication?
No. We connected to HerStack without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the HerStack MCP server still maintained?
HerStack is still listed as active in the MCP registry. We last reached this channel on 4 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.