ContextTax

Measure the context-window tax an MCP server charges your AI agent — the real token cost of its tool schemas + responses. Ground truth (Anthropic count_tokens) or keyless estimate. Cross-platform single-file CLI.

{
  "mcpServers": {
    "contexttax": {
      "command": "npx",
      "args": [
        "-y",
        "PavelTkachenk0/ContextTax"
      ]
    }
  }
}

claude mcp add contexttax npx -y PavelTkachenk0/ContextTax

{
  "mcpServers": {
    "contexttax": {
      "command": "npx",
      "args": [
        "-y",
        "PavelTkachenk0/ContextTax"
      ]
    }
  }
}