KKubb MCP

Tested npm @kubb/mcp 5.18.1 (MIT; Kubb monorepo kubb-labs/kubb, 1,843 GitHub stars when checked). Stdio, 3 tools, no key. validate accepted our small valid OpenAPI file and rejected a broken one (missing info.version) with a clear error, returned as isError true, which is the expected result for bad input. generate and init write files and were not called.
Tool-call test (2026-11-11, direct MCP stdio client, no LLM): pass. 2 of 2 validate calls behaved correctly (valid spec accepted, broken spec rejected). generate/init (write files) not called. Evidence: local test run, Nov 11, 2026.

Transport (tested 2026-11-11): stdio

Score 100/100 · Tools 3 · Token cost approx. 393 tokens · Compare · Last tested 2026-11-11 · Version tested 5.18.1 · Package @kubb/mcp · Repo kubb-labs/kubb

Summary: Kubb MCP completed an MCP handshake without credentials and exposed 3 tools.

Evidence summary

Handshake

pass

Tools listed

3

Context cost

approx. 393 tokens, cl100k estimate (3 tools, measured 2026-11-11, version 5.18.1; an estimate) ranking · add up your servers' context cost

API key

No key needed for the tools we called

Tested

2026-11-11

Test results

Local-model readiness

Token cost (estimate): approx. 393 tokens, cl100k estimate for 3 tools · about 5% of an 8k context. This is an estimate from our testing (counted with cl100k_base).

Small-model friendly (schema heuristic, not a model result): unknown.

What we tested and what we didn't

Methodology: how we test. A high score means it installs and responds, not that giving it access to your data carries no risk.

{
  "name": "@kubb/mcp",
  "version": "5.18.1",
  "registry": "npm",
  "status": "working",
  "tested": "2026-11-11",
  "tools_count": 3,
  "deprecated": false,
  "archived": false,
  "tests": {
    "install": [
      "pass",
      20,
      "`npm install @kubb/mcp` (Node 20, Linux) succeeded in 2s."
    ],
    "handshake": [
      "pass",
      30,
      "MCP `initialize` + `tools/list` over stdio succeeded with no credentials; 3 tools listed in 1.5s."
    ],
    "maintenance": [
      "pass",
      25,
      "Repo pushed 0 days before test; 1,843 GitHub stars."
    ],
    "docs": [
      "pass",
      15,
      "README over 3,000 chars; install instructions present; `mcpServers` config example present. Check of the package's own README (README shipped in npm package)."
    ],
    "license": [
      "pass",
      10,
      "MIT (OSI-approved)."
    ]
  }
}

Install

npx -y @kubb/mcpCopy

Pin the version we tested

npx -y @kubb/mcp@5.18.1Copy

tested 2026-11-11. Newer versions may differ and were not tested by us.

{
  "mcpServers": {
    "kubb-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@kubb/mcp@5.18.1"
      ]
    }
  }
}

Tools listed

generate, init, validate

Tool history: captured Nov 11, 2026. All tool history.

Quick config

{
  "mcpServers": {
    "kubb-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@kubb/mcp"
      ]
    }
  }
}

Add to config Opens the config generator with this server selected.

{
  "mcpServers": {
    "kubb-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@kubb/mcp"
      ]
    }
  }
}

Related: Best dev MCP servers

FAQ

Is Kubb MCP deprecated?

No. @kubb/mcp was not deprecated or archived when we last tested it on 2026-11-11.

What replaces Kubb MCP?

Nothing; Kubb MCP is not deprecated as of 2026-11-11.

Does Kubb MCP need an API key?

No. It completed an MCP handshake with no credentials and listed 3 tools.

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