# HerStack (remote · herstack.co.uk)

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

- Trust score: 79/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-20

## Components

- remote · `herstack.co.uk`: 79/100 (this document), [markdown](https://verifymcp.io/servers/uk-co-herstack-herstack/api-mcp.md), [page](https://verifymcp.io/servers/uk-co-herstack-herstack/api-mcp)

## Channel facts

- Endpoint: `https://herstack.co.uk/api/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.2.0`

## Trust breakdown

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. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-09-20.

- **Endpoint Security**: 80/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 89/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 1032 tokens (~79/item across 13 items; 5 tools + 8 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 23/100
  - Stability check failed: schema churn in the 27 days we've observed: 2 tool removals, 0 breaking changes, 0 auth/transport breaks, 4 additions.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 5 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 7 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### 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.

### Claude

```bash
claude mcp add --transport http uk-co-herstack-herstack 'https://herstack.co.uk/api/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "uk-co-herstack-herstack": {
      "url": "https://herstack.co.uk/api/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "uk-co-herstack-herstack": {
      "type": "http",
      "url": "https://herstack.co.uk/api/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.uk-co-herstack-herstack]
url = "https://herstack.co.uk/api/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "uk-co-herstack-herstack": {
      "type": "remote",
      "url": "https://herstack.co.uk/api/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add uk-co-herstack-herstack --url 'https://herstack.co.uk/api/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  uk-co-herstack-herstack:
    url: "https://herstack.co.uk/api/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "uk-co-herstack-herstack": {
      "Transport": "http",
      "Url": "https://herstack.co.uk/api/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add uk-co-herstack-herstack -t streamable-http -u 'https://herstack.co.uk/api/mcp'
```

### Other

```json
{
  "mcpServers": {
    "uk-co-herstack-herstack": {
      "type": "http",
      "url": "https://herstack.co.uk/api/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-09-19 (score 79, +1)

No change was recorded against any check on this day. Stability & Change Management went from 17 to 20.

### 2026-09-17 (score 78, +1)

No change was recorded against any check on this day. Stability & Change Management went from 10 to 13.

### 2026-09-15 (score 77, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7.

### 2026-09-11 (score 76, 0)

- [security regression] Tool “get_authorised_claims” was removed
- [security] The server rewrote its instructions, which are the text every model session reads
- [functional improvement] Schema quality: 1161 → 1032
- [functional] Server version: 1.1.0 → 1.2.0

### 2026-09-10 (score 76, −4)

- [security regression] Stability: 0.53 → fail
- [security regression] Tool “assess_concern” was removed
- [security regression] 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
- [functional improvement] 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”
- [cosmetic] “recommend_supplements” added an optional parameter “topic”
- [cosmetic] “recommend_supplements” reworded the description of “concern”
- [cosmetic] “recommend_supplements” dropped the optional parameter “cluster”

### 2026-09-09 (score 80, +1)

No change was recorded against any check on this day. Stability & Change Management went from 50 to 53. That category is still filling its 30-day observation window: 15 days of observed history at the previous scan, 16 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-07 (score 79, +1)

No change was recorded against any check on this day. Stability & Change Management went from 43 to 47. That category is still filling its 30-day observation window: 13 days of observed history at the previous scan, 14 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-05 (score 78, +1)

No change was recorded against any check on this day. Stability & Change Management went from 37 to 40. That category is still filling its 30-day observation window: 11 days of observed history at the previous scan, 12 at this one. The score rises as the window fills, whether or not the server changes.

## MCP tools (5)

### `search_guidance` (~145 tokens)

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.

Input parameters:

- `maxResults` (integer): How many answer units to return (default 6).
- `question` (string, required): The user's question or situation, in their words.

### `get_topic_guidance` (~107 tokens)

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).

Input parameters:

- `topic` (string, required): Topic: perimenopause, digestion, longevity, stress, exercise, nutrition, skin.

### `recommend_supplements` (~128 tokens)

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.

Input parameters:

- `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.

### `get_evidence` (~111 tokens)

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.

Input parameters:

- `nutrient` (string): A nutrient or ingredient, e.g. 'magnesium', 'collagen', 'vitamin d'.
- `topic` (string): Topic: perimenopause, digestion, longevity, stress, exercise, nutrition, skin.

### `get_product_details` (~72 tokens)

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.

Input parameters:

- `sku` (string, required): Product name or SKU, e.g. 'Chelated Magnesium'.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/uk-co-herstack-herstack/api-mcp#diagnostics

## Score history

- 2026-09-20: 79
- 2026-09-19: 79
- 2026-09-18: 78
- 2026-09-17: 78
- 2026-09-16: 77
- 2026-09-15: 77
- 2026-09-14: 76
- 2026-09-13: 76
- 2026-09-12: 76
- 2026-09-11: 76
- 2026-09-10: 76
- 2026-09-09: 80
- 2026-09-08: 79
- 2026-09-07: 79
- 2026-09-06: 78
- 2026-09-05: 78
- 2026-09-04: 77
- 2026-09-03: 77
- 2026-09-02: 76
- 2026-09-01: 76
- 2026-08-31: 75
- 2026-08-30: 75
- 2026-08-29: 75
- 2026-08-28: 74
- 2026-08-27: 74
- 2026-08-26: 73
- 2026-08-25: 71
- 2026-08-24: 71

## Common questions

### 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, Solgar UK picks. This page covers its hosted endpoint (https://herstack.co.uk/api/mcp).

### Is the HerStack MCP server safe to use?

HerStack scores 79 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 563 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 20 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://herstack.co.uk/api/mcp
- Website: https://herstack.co.uk/mcp
- Changelog RSS feed: https://verifymcp.io/servers/uk-co-herstack-herstack/api-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/uk-co-herstack-herstack/api-mcp.json
- HTML version of this page: https://verifymcp.io/servers/uk-co-herstack-herstack/api-mcp