# Corium 21 Skin Tools (remote · mcp.corium21.com)

Decode skincare ingredient labels (1% line, % ranges, what each does) and get US dry skin forecasts.

- Trust score: 73/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `mcp.corium21.com`: 73/100 (this document), [markdown](https://verifymcp.io/servers/jessejohnsohn-corium21/mcp.md), [page](https://verifymcp.io/servers/jessejohnsohn-corium21/mcp)

## Channel facts

- Endpoint: `https://mcp.corium21.com/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## 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 2026-11-05.

- **Endpoint Security**: 74/100
  - 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.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - 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**: 71/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 598 tokens (~199/item across 3 items; 3 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 20/100
  - Stability observed for 6 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **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 3 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 4 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 Corium 21 Skin Tools MCP server?

Corium 21 Skin Tools is a hosted endpoint at https://mcp.corium21.com/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 jessejohnsohn-corium21 'https://mcp.corium21.com/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "jessejohnsohn-corium21": {
      "url": "https://mcp.corium21.com/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "jessejohnsohn-corium21": {
      "type": "http",
      "url": "https://mcp.corium21.com/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.jessejohnsohn-corium21]
url = "https://mcp.corium21.com/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "jessejohnsohn-corium21": {
      "type": "remote",
      "url": "https://mcp.corium21.com/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add jessejohnsohn-corium21 --url 'https://mcp.corium21.com/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  jessejohnsohn-corium21:
    url: "https://mcp.corium21.com/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "jessejohnsohn-corium21": {
      "Transport": "http",
      "Url": "https://mcp.corium21.com/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add jessejohnsohn-corium21 -t streamable-http -u 'https://mcp.corium21.com/mcp'
```

### Other

```json
{
  "mcpServers": {
    "jessejohnsohn-corium21": {
      "type": "http",
      "url": "https://mcp.corium21.com/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.

### 2026-11-04 (score 73, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-02 (score 72, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-31 (score 71, +1)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-30 (score 70)

First indexed and scored.

## MCP tools (3)

### `decode_ingredient_label` (~218 tokens)

Decode a skincare ingredient label

Estimate what's really in a lotion, cream, balm or serum from its printed ingredient list (INCI). Finds the likely '1% line' (ingredients above it must be listed by amount under US FDA 21 CFR 701.3 and EU rules), gives a rough percentage range for each ingredient above the line, says what each ingredient does, and adds neutral notes on ingredients people with sensitive or eczema-prone skin often avoid (fragrance, essential oils, some preservatives). Estimates come from label order and typical use levels; they are not lab measurements. Same engine as https://corium21.com/pages/ingredient-label-decoder.

Input parameters:

- `ingredients` (string, required): The ingredient list exactly as printed on the label, comma separated. A pasted 'Ingredients:' heading, 'May contain' section or Drug Facts panel is fine.
- `product_type` (string): cream = lotion or cream (default); rich = rich cream, body butter or balm; light = light lotion, gel-cream or serum. Adjusts typical use levels.

### `explain_ingredient` (~112 tokens)

Explain one skincare ingredient

Say what a single cosmetic ingredient does in a moisturizer (humectant, emollient, occlusive, preservative and so on), its typical use level, common alternative names, and any notes for sensitive skin. Covers 233 common moisturizer ingredients by INCI or common name, and makes a labeled best guess from the name for anything else.

Input parameters:

- `name` (string, required): Ingredient name, INCI or common, e.g. 'Butyrospermum Parkii Butter' or 'shea butter'.

### `dry_skin_forecast` (~161 tokens)

7-day dry skin forecast (US)

7-day dry skin outlook for a US ZIP code or US latitude/longitude. Estimates how dry indoor air will get once the heat is on (outdoor dew point heated to 70°F), rates each day Low, Moderate, High or Very high, and gives a simple skin-care tip for each level. Uses the US National Weather Service forecast; US locations only. Same method as https://corium21.com/pages/dry-skin-forecast.

Input parameters:

- `days` (integer): How many days to return, starting today.
- `latitude` (number): Latitude of a US location.
- `longitude` (number): Longitude of a US location.
- `zip` (string): 5-digit US ZIP code. Use this or latitude + longitude.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/jessejohnsohn-corium21/mcp#diagnostics

## Score history

- 2026-11-05: 73
- 2026-11-04: 73
- 2026-11-03: 72
- 2026-11-02: 72
- 2026-11-01: 71
- 2026-10-31: 71
- 2026-10-30: 70

## Common questions

### What is the Corium 21 Skin Tools MCP server?

Corium 21 Skin Tools is an MCP server listed in the public MCP registry as io.github.jessejohnsohn/corium21. Decode skincare ingredient labels (1% line, % ranges, what each does) and get US dry skin forecasts. This page covers its hosted endpoint (https://mcp.corium21.com/mcp).

### Is the Corium 21 Skin Tools MCP server safe to use?

Corium 21 Skin Tools scores 73 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 Corium 21 Skin Tools MCP server expose?

Corium 21 Skin Tools exposes 3 tools: decode_ingredient_label, explain_ingredient, dry_skin_forecast. Their descriptions and schemas cost roughly 491 tokens of context every time the server is loaded.

### Does the Corium 21 Skin Tools MCP server require authentication?

No. We connected to Corium 21 Skin Tools without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Corium 21 Skin Tools MCP server still maintained?

Corium 21 Skin Tools is still listed as active in the MCP registry. We last reached this channel on 5 November 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://mcp.corium21.com/mcp
- Website: https://corium21.com/
- Changelog RSS feed: https://verifymcp.io/servers/jessejohnsohn-corium21/mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/jessejohnsohn-corium21/mcp.json
- HTML version of this page: https://verifymcp.io/servers/jessejohnsohn-corium21/mcp