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Crucible MCP server

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

read 2026-10-24

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Whose server it is
  • Registry namecom.crucibleui/registryverified in the MCP registry

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

When we asked itchecked 2026-10-24
  • Stateanswerschecked 2026-10-24
  • Tools4
  • Server calls itselfcrucible
  • Server version1.0.0
  • Protocol version2025-06-18

On 2026-10-24 the server answered initialize and tools/list without a sign-in. First answer in 125 ms.

Should an agent connect itNot proven either way yet
  • Whether its tools do the product's job has not been judged yet.
  • Checked on 1 of the 7 days it takes to judge reliability.

Once connected

  • Parameters are untyped or undescribed in 1 of 4 tools: check arguments before calling.

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: 1, the first on 2026-10-24
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 1 so far
  • Answeredmeasuring1 of the 7 daily checks it takes to print a share
  • Median first answer237 ms
  • Space in an agent's context≈ 502 tokensthe definitions of all its tools (4), which an agent carries on every turn
  • Tool definitionsB · 79 of 100
  • Typed results0 of 4 toolsdeclared outputSchema: results come typed, read once
  • Parameters without a description: in 1 of 4
  • Not saying whether it only reads or can destroy: 4 of 4

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 2026-10-24
  • search_registry

    Search Crucible's animated React components by keyword, category, or tier. Returns names, descriptions, and dependencies. Use get_component to fetch source.

  • get_component

    Fetch the full TypeScript source of a Crucible component, ready to drop into a shadcn-style project. Pro components require an Authorization: Bearer <CRUCIBLE_TOKEN> header (get a token at https://crucibleui.com/account).

  • install_instructions

    How to install a Crucible component into a project: shadcn CLI command, registry config, and npm dependencies.

  • get_usage

    Show how to USE a Crucible component correctly: a worked example (its demo source) plus the conventions that make it render — notably the `relative isolate` wrapper that background components require. Call this before writing integration…

How to connect

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

{
  "mcpServers": {
    "registry": {
      "type": "http",
      "url": "https://crucibleui.com/api/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http crucibleui https://crucibleui.com/api/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://crucibleui.com/api/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.