kleinanzeigen-mcp

A read-only, robots-clean MCP server over kleinanzeigen.de, the German classifieds site.

What it does

Install

Node 22 or newer is required. Four channels install the same build from the same release — they differ only in who does the fetching, and nothing propagates between them.

npm / npx — any MCP client

The package is kanzeigen-mcp.

There is no install step and nothing to build. Point your client at npx and let it fetch the package on first run:

{
  "mcpServers": {
    "kleinanzeigen": {
      "command": "npx",
      "args": ["-y", "kanzeigen-mcp"]
    }
  }
}

That block goes in your client's config file — claude_desktop_config.json for Claude Desktop, .mcp.json for Claude Code, the equivalent for anything else. Restart the client afterwards.

To verify by hand, without a client:

npx -y kanzeigen-mcp

Claude Code

claude mcp add kleinanzeigen -- npx -y kanzeigen-mcp

Any environment assignment goes before the --. Everything after the -- is the command Claude Code runs, so a variable placed there becomes an argument to npx rather than an environment variable:

claude mcp add kleinanzeigen -e KLEINANZEIGEN_MCP_RATE_LIMIT_MS=3000 -- npx -y kanzeigen-mcp

Claude Desktop — the MCPB

Download kanzeigen-mcp-<version>.mcpb from the latest release and open it. Claude Desktop installs it and offers the one knob below as a form field, so nothing here needs a config file.

Two things are worth knowing before you pick it. The bundle ships unsigned, so the install dialog warns — self-signing fails its own verification, and a real certificate is a purchase nobody has made. And the format has no update mechanism: an installed .mcpb is as current as the day it was downloaded, and nothing will ever prompt you.

Claude Code plugin — the server and the skill

/plugin marketplace add IIxauII/kleinanzeigen-mcp
/plugin install kanzeigen@kanzeigen

Configuration

KLEINANZEIGEN_MCP_RATE_LIMIT_MS — the minimum gap between requests, in milliseconds.

• Unset means 1500 ms.

{
  "mcpServers": {
    "kleinanzeigen": {
      "command": "npx",
      "args": ["-y", "kanzeigen-mcp"],
      "env": { "KLEINANZEIGEN_MCP_RATE_LIMIT_MS": "3000" }
    }
  }
}

Development

Run from a clone. This is the development path rather than an install channel — it is the only one that yields a tree the drift check and the fixture-capture scripts can run in.

git clone git@github.com:IIxauII/kleinanzeigen-mcp.git
cd kleinanzeigen-mcp
npm install
npm run build

npm run build produces a single-file ESM bundle at dist/index.js plus two sidecar datasets beside it. Point a client at it by absolute path:

{
  "mcpServers": {
    "kleinanzeigen": {
      "command": "node",
      "args": ["/absolute/path/to/kleinanzeigen-mcp/dist/index.js"]
    }
  }
}

npm test           # the whole suite
npm run typecheck  # tsc --noEmit, which is the real typecheck
npm run build      # tsup, into dist/

Parser tests run against committed fixtures: hand-captured out of band by a dev-time script — never by the server — minimised to the DOM the parser actually reads, and redacted. The redaction rule is everything personal or identifying in the captured markup, including attributes the parser never reads: a pass aimed only at the fields the parser touches is how partner-ad ids and shop names once survived in tracking attributes. A test pins the rule.

Maintainer procedure — regenerating the two bundled datasets, running the drift check, and cutting a release — lives in docs/maintenance.md, because it addresses someone standing in a clone rather than someone who installed this.

Further reading: SPEC.md for the full contract, CONTEXT.md for the vocabulary every name in the codebase uses, and docs/adr/ for the decisions behind the posture.