# Coolours (remote · coolours.perpetualsummer.ltd)

Turn AI-designed colour palettes into Coolours links, with colour names, CSS and contrast checks

- Trust score: 82/100 (high trust)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `coolours.perpetualsummer.ltd`: 82/100 (this document), [markdown](https://verifymcp.io/servers/ltd-perpetualsummer-coolours/coolours.md), [page](https://verifymcp.io/servers/ltd-perpetualsummer-coolours/coolours)

## Channel facts

- Endpoint: `https://coolours.perpetualsummer.ltd/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.2.1`

## 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**: 68/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 599 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**: 93/100
  - Stability observed for 28 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 94/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 80% of tool parameters carry a description.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **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 Coolours MCP server?

Coolours is a hosted endpoint at https://coolours.perpetualsummer.ltd/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 ltd-perpetualsummer-coolours 'https://coolours.perpetualsummer.ltd/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "ltd-perpetualsummer-coolours": {
      "url": "https://coolours.perpetualsummer.ltd/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "ltd-perpetualsummer-coolours": {
      "type": "http",
      "url": "https://coolours.perpetualsummer.ltd/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.ltd-perpetualsummer-coolours]
url = "https://coolours.perpetualsummer.ltd/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "ltd-perpetualsummer-coolours": {
      "type": "remote",
      "url": "https://coolours.perpetualsummer.ltd/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add ltd-perpetualsummer-coolours --url 'https://coolours.perpetualsummer.ltd/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  ltd-perpetualsummer-coolours:
    url: "https://coolours.perpetualsummer.ltd/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "ltd-perpetualsummer-coolours": {
      "Transport": "http",
      "Url": "https://coolours.perpetualsummer.ltd/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add ltd-perpetualsummer-coolours -t streamable-http -u 'https://coolours.perpetualsummer.ltd/mcp'
```

### Other

```json
{
  "mcpServers": {
    "ltd-perpetualsummer-coolours": {
      "type": "http",
      "url": "https://coolours.perpetualsummer.ltd/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.

### 2026-11-03 (score 82, +1)

No change was recorded against any check on this day. Stability & Change Management went from 83 to 87. That category is still filling its 30-day observation window: 25 days of observed history at the previous scan, 26 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-01 (score 81, +1)

No change was recorded against any check on this day. Stability & Change Management went from 77 to 80. That category is still filling its 30-day observation window: 23 days of observed history at the previous scan, 24 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-30 (score 80, +1)

No change was recorded against any check on this day. Stability & Change Management went from 70 to 73. That category is still filling its 30-day observation window: 21 days of observed history at the previous scan, 22 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-28 (score 79, +1)

No change was recorded against any check on this day. Stability & Change Management went from 63 to 67. That category is still filling its 30-day observation window: 19 days of observed history at the previous scan, 20 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-26 (score 78, +1)

No change was recorded against any check on this day. Stability & Change Management went from 57 to 60. That category is still filling its 30-day observation window: 17 days of observed history at the previous scan, 18 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-24 (score 77, +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.

### 2026-10-22 (score 76, +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.

### 2026-10-19 (score 75, +1)

No change was recorded against any check on this day. Stability & Change Management went from 33 to 37. That category is still filling its 30-day observation window: 10 days of observed history at the previous scan, 11 at this one. The score rises as the window fills, whether or not the server changes.

## MCP tools (3)

### `create_palette_link` (~212 tokens)

Create Coolours palette link

Turn a colour palette you have chosen into a link that opens it in Coolours (coolours.perpetualsummer.ltd), where the user can preview the swatches, tweak them and export them. Use this whenever you propose a colour scheme, so the user can see it rather than read hex codes. Also returns WCAG contrast ratios for every pair of colours: check them before recommending a text/background pairing (4.5 or more for body text, 3 or more for large text and UI components). Returns each colour's Coolours name: use those names when presenting the palette. Also returns the palette as CSS custom properties: whenever you show CSS, use it exactly as given rather than writing your own. Give the user the URL.

Input parameters:

- `colours` (array, required): Colours in display order. Hex ("#1E293B", "#abc"), rgb() or CSS colour names. No transparency.
- `name` (string): Palette name shown on the site, e.g. "Fintech Dark"

Output parameters:

- `colours` (array): Each colour with the name Coolours shows on its swatch
- `contrast` (array)
- `css` (string): CSS custom properties exactly as Coolours exports them. Use as given; variable names match the Coolours UI
- `url` (string)

### `parse_palette_link` (~74 tokens)

Read Coolours palette link

Read the colours and name back out of a Coolours link (coolours.perpetualsummer.ltd/create/...). Use this when the user pastes a Coolours URL, for example after editing a palette on the site, so you can apply their changes.

Input parameters:

- `url` (string, required): The full Coolours URL

Output parameters:

- `colours` (array): Each colour with the name Coolours shows on its swatch
- `contrast` (array)
- `css` (string): CSS custom properties exactly as Coolours exports them. Use as given; variable names match the Coolours UI
- `ignored` (array): URL segments that are not valid swatches; the site ignores these too
- `name` (string)

### `export_palette` (~116 tokens)

Export palette as code

Export a palette as CSS custom properties or a JavaScript object, with each colour named after its nearest named colour. Output matches Coolours' own Export feature. create_palette_link already returns the CSS; use this for the JS object, or for a palette you didn't create. Use the output as given: its names match the Coolours UI.

Input parameters:

- `colours` (array, required): Colours in display order. Hex ("#1E293B", "#abc"), rgb() or CSS colour names. No transparency.
- `format` (string, required)

Output parameters:

- `code` (string)

## Diagnostics

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

## Score history

- 2026-11-05: 82
- 2026-11-04: 82
- 2026-11-03: 82
- 2026-11-02: 81
- 2026-11-01: 81
- 2026-10-31: 80
- 2026-10-30: 80
- 2026-10-29: 79
- 2026-10-28: 79
- 2026-10-27: 78
- 2026-10-26: 78
- 2026-10-25: 77
- 2026-10-24: 77
- 2026-10-23: 76
- 2026-10-22: 76
- 2026-10-21: 75
- 2026-10-20: 75
- 2026-10-19: 75
- 2026-10-18: 74
- 2026-10-17: 74
- 2026-10-16: 73
- 2026-10-15: 73
- 2026-10-14: 72
- 2026-10-13: 72
- 2026-10-12: 71
- 2026-10-11: 71
- 2026-10-10: 70
- 2026-10-08: 69

## Common questions

### What is the Coolours MCP server?

Coolours is an MCP server listed in the public MCP registry as ltd.perpetualsummer/coolours. Turn AI-designed colour palettes into Coolours links, with colour names, CSS and contrast checks. This page covers its hosted endpoint (https://coolours.perpetualsummer.ltd/mcp).

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

Coolours scores 82 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 Coolours MCP server expose?

Coolours exposes 3 tools: create_palette_link, parse_palette_link, export_palette. Their descriptions and schemas cost roughly 402 tokens of context every time the server is loaded.

### Does the Coolours MCP server require authentication?

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

### Is the Coolours MCP server still maintained?

Coolours 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://coolours.perpetualsummer.ltd/mcp
- Website: https://coolours.perpetualsummer.ltd/
- Changelog RSS feed: https://verifymcp.io/servers/ltd-perpetualsummer-coolours/coolours.xml
- Changelog JSON feed: https://verifymcp.io/servers/ltd-perpetualsummer-coolours/coolours.json
- HTML version of this page: https://verifymcp.io/servers/ltd-perpetualsummer-coolours/coolours