Koskamo

ONYST RVG MCP

An MCP server that provides access to ONYST's fee engine for calculating German legal fees under the RVG, determining values in dispute, and generating invoices and calculation sheets. It ensures amounts are derived from ONYST's data rather than the language model.

Visit ONYST

Endpoint and access

OAuth sign-in: the first time you connect, your client opens the vendor's own authorization prompt in a browser.

ONYST RVG MCP logo, by ONYSTVendor evidenceStreamable HTTPOAuth sign-inEndpoint checked 2026-11-07Operated by ONYST
You need:Access key. It is part of the ONYST RVG plan.Without a plan, 100 requests per calendar month are free.
MCP endpoint (Streamable HTTP)
https://api.onyst.legal/mcp
Vendor documentation

Checks and signals

Each line is separate evidence, not a trust score.

  • Passed Endpoint answered the live check ·
  • Passed Official MCP Registry namespace is tied to onyst.legal ·
  • Passed Endpoint is on the registry namespace domain ·
  • Availability 1 of 1 checks passed in 30 days

What you can do with it

  • Calculate RVG fees for legal matters
  • Determine values in dispute
  • Create invoices and calculation sheets

Source and maintenance

Vendor evidenceRegistry 1.0.0
mcp-registry: legal.onyst/rvg@1.0.0Project website

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

90-day uptime

A lightweight connection check about every six hours, sampled on hosts with many listings. It shows the server answered, not that its tools work.

Too few checks for a percentage yet (1 of 1 answered).

  1. 2026-11-09: 1 of 1 checks answered

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
204 ms
95th percentile latency
204 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 204 ms · metadata changed · refuses unauthenticated initialize (HTTP 401)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http onyst-rvg-mcp https://api.onyst.legal/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add onyst-rvg-mcp --url https://api.onyst.legal/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable onyst-rvg-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "onyst-rvg-mcp": {
      "url": "https://api.onyst.legal/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "onyst-rvg-mcp": {
      "type": "streamableHttp",
      "url": "https://api.onyst.legal/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start onyst-rvg-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "onyst-rvg-mcp": {
      "type": "http",
      "url": "https://api.onyst.legal/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http onyst-rvg-mcp https://api.onyst.legal/mcp

Claude Desktop

Open Claude Settings > Connectors > Add custom connector, enter this server URL and enable it for the conversation. This is a manual remote-connector handoff, not a desktop JSON configuration.
Claude Desktop configuration
https://api.onyst.legal/mcp

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "onyst-rvg-mcp": {
      "serverUrl": "https://api.onyst.legal/mcp"
    }
  }
}

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Do you run ONYST RVG MCP?

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