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ARCAT MCP server

Which servers in the official MCP registry are ARCAT's own, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-15

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Whose server it is
  • Registry namecom.arcat/arcatverified in the MCP registry

The registry name sits under arcat.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-15
  • Stateanswerschecked 2026-10-15
  • Tools4
  • Server calls itselfarcat
  • Server version0.5.0
  • Protocol version2025-06-18

On 2026-10-15 the server answered initialize and tools/list without a sign-in. First answer in 150 ms.

Should an agent connect itNot proven either way yet
  • Its tools do browse building products by CSI division, but not download manufacturer technical data sheets and CAD drawings.
  • Checked on 3 of the 7 days it takes to judge reliability.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 3, the first on 2026-10-19
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 3 so far
  • What an agent can do with it1 of 2 use cases
  • Answeredmeasuring3 of the 7 daily checks it takes to print a share
  • Median first answer242 ms
  • Space in an agent's context≈ 848 tokensthe definitions of all its tools (4), which an agent carries on every turn
  • Tool definitionsA · 100 of 100
  • Typed results4 of 4 toolsdeclared outputSchema: results come typed, read once
  • Every tool passes all six checks.

What an agent can do with it

  • can do · browse building products by CSI division
  • not sure · generate CSI specifications through guided questions
  • cannot · download manufacturer technical data sheets and CAD drawings

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (30%), doing the product's job (25%), definitions (20%), context (10%) and use (15%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers4 tools · read 2026-10-15
  • search_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.

  • search_manufacturers

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

  • get_manufacturer

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

  • 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…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "arcat": {
      "type": "http",
      "url": "https://mcp.arcat.com/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

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

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://mcp.arcat.com/mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.