# com.arcat/arcat (remote · mcp.arcat.com)

Search building products & manufacturers for AI agents: CAD, BIM, specs by CSI from arcat.com

- Trust score: 73/100 (medium)
- Change this week: +55
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

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

## Channel facts

- Endpoint: `https://mcp.arcat.com/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.5.0`

## 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 2026-08-03.

- **Endpoint Security**: 77/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation is enforced on tool calls, but the challenge carries no valid RFC 9728 metadata, so a client cannot discover where to get a token.
  - HTTPS not yet verified: we couldn't determine whether a plaintext access path exists.
  - 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**: 73/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 575 tokens (~143/item across 4 items; 4 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.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add --transport http com-arcat-arcat https://mcp.arcat.com/mcp
```

### Codex

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

### opencode

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

### OpenClaw

```bash
openclaw mcp add com-arcat-arcat --url https://mcp.arcat.com/mcp --transport streamable-http
```

### Hermes

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

### Other

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

### 2026-08-02 (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.

### 2026-07-31 (score 72, +3)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-30 (score 69, +1)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-29 (score 68, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-07-28 (score 68, +50)

- [security regression] Authorization: unverified → fail
- [security regression] HTTPS: pass → unverified
- [security improvement] HSTS header: unverified → pass
- [security improvement] Transport: fail → pass
- [functional improvement] Tool coverage: unverified → 100
- [functional improvement] MCP protocol: unverified → pass
- [functional] First check of Schema quality: fail
- [functional] First check of Schema quality: fail
- [functional] First check of Tool coverage: 100
- [functional] First check of Tool coverage: 100
- [functional] First check of Schema quality: excellent

### 2026-07-27 (score 18, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-26 (score 18)

First indexed and scored.

## MCP tools (4)

### `search_products` (~163 tokens)

Search Building Products

Search for building products by keyword, CSI MasterFormat section, or content format. Returns product details with links to specifications, CAD, BIM, and catalog downloads on arcat.com.

Input parameters:

- `csi_division` (string): CSI MasterFormat 04 division (e.g., "07")
- `csi_section` (string): CSI MasterFormat 04 section code (e.g., "074600")
- `format_filter` (string): Filter by available content format
- `limit` (integer): Max results (1-50, default 20)
- `made_in_usa` (boolean): Filter for Made in USA products only
- `offset` (integer): Pagination offset
- `query` (string): Text search (e.g., "fiber cement rainscreen")

Output parameters:

- `results` (array)
- `total` (integer)

### `search_manufacturers` (~131 tokens)

Search Manufacturers

Search for building product manufacturers by name, keyword, or CSI MasterFormat section. Returns company details with links to their ARCAT profile.

Input parameters:

- `csi_division` (string): CSI MasterFormat 04 division (e.g., "07")
- `csi_section` (string): CSI MasterFormat 04 section code (e.g., "074600")
- `limit` (integer): Max results (1-50, default 20)
- `offset` (integer): Pagination offset
- `query` (string): Text search (e.g., "terra cotta", "Owens Corning")

Output parameters:

- `results` (array)
- `total` (integer)

### `get_manufacturer` (~55 tokens)

Get Manufacturer Profile

Get detailed profile for a specific building product manufacturer by their ARCAT ID. Returns company info, CSI sections, available content types, and product count.

Input parameters:

- `manufacturer_id` (integer, required): ARCAT manufacturer ID (seq/coid)

Output parameters:

- `arcat_url` (string)
- `available_content` (array)
- `csi_sections` (array)
- `error` (string)
- `location` (object)
- `manufacturer_id`
- `name` (string)
- `product_count` (number)
- `website` (string)

### `browse_csi_sections` (~226 tokens)

Browse CSI Sections

Browse CSI MasterFormat building product categories.

No parameters: list all divisions (e.g., "07 - Thermal and Moisture Protection").
Division only: list all entries under that division.
Division + level: filter by hierarchy depth:
  Level 1 = Groups (e.g., 07 10 00 Dampproofing and Waterproofing)
  Level 2 = Sections (e.g., 07 21 00 Thermal Insulation)
  Level 3 = Narrowscope (e.g., 07 21 13 Board Insulation)
Add section to drill into a specific parent (e.g., division "07", level 2, section "072000").

Input parameters:

- `division` (string): CSI division code (e.g., "07"). Omit to list all divisions.
- `level` (integer): Hierarchy depth within division: 1=group, 2=section, 3=narrowscope
- `section` (string): Parent section code to filter within (e.g., "072000" to see sections under Thermal Protection)

Output parameters:

- `sections` (array)
- `total` (integer)

## Diagnostics

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

## Score history

- 2026-08-03: 73
- 2026-08-02: 73
- 2026-08-01: 72
- 2026-07-31: 72
- 2026-07-30: 69
- 2026-07-29: 68
- 2026-07-28: 68
- 2026-07-27: 18
- 2026-07-26: 18

## Links

- Remote endpoint: https://mcp.arcat.com/mcp
- Changelog RSS feed: https://verifymcp.io/servers/com-arcat-arcat/mcp/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-arcat-arcat/mcp/changelog.json
- HTML version of this page: https://verifymcp.io/servers/com-arcat-arcat/mcp