{
  "specVersion": "0.91",
  "publisher": {
    "name": "Calcgrid",
    "url": "https://tttkmbb.com"
  },
  "updatedAt": "2026-09-23",
  "description": "Calcgrid: 184 deterministic calculators exposed as an MCP server, an A2A agent, a REST API (OpenAPI 3.1) and Markdown documentation. No authentication.",
  "entries": [
    {
      "identifier": "urn:air:tttkmbb.com:server:calculators-mcp",
      "displayName": "Calcgrid MCP server",
      "type": "application/mcp-server-card+json",
      "url": "https://tttkmbb.com/.well-known/mcp-server-card.json",
      "description": "Streamable HTTP MCP server at https://tttkmbb.com/mcp with 26 read-only tools (search, schema, run any of 184 calculators, unit conversion). No auth.",
      "capabilities": [
        "search_calculators",
        "list_calculators",
        "list_calculator_categories",
        "get_calculator_schema",
        "run_calculator",
        "convert_units",
        "list_units",
        "calculate_compound_interest",
        "calculate_loan_payment",
        "calculate_mortgage_payment",
        "calculate_tip",
        "calculate_bmi",
        "calculate_bmr",
        "calculate_tdee",
        "calculate_running_pace",
        "calculate_percentage",
        "calculate_percentage_change",
        "solve_quadratic_equation",
        "calculate_circle_properties",
        "calculate_descriptive_statistics",
        "convert_temperature",
        "calculate_kinetic_energy",
        "solve_ohms_law",
        "calculate_molar_mass",
        "calculate_age",
        "calculate_date_difference"
      ],
      "representativeQueries": [
        "monthly payment on a 300000 mortgage at 6%",
        "compound interest on 10000 for 5 years",
        "what is my BMI at 70 kg and 175 cm",
        "how many calories do I burn per day",
        "pace for a 10 km run in 50 minutes",
        "predict my marathon time from a half marathon",
        "what is 15% of 240",
        "solve x^2 - 5x + 6 = 0"
      ],
      "tags": [
        "calculator",
        "mcp",
        "math",
        "finance",
        "health",
        "conversion"
      ],
      "version": "1.0.0",
      "updatedAt": "2026-09-23"
    },
    {
      "identifier": "urn:air:tttkmbb.com:agent:calculator-agent",
      "displayName": "Calcgrid A2A agent",
      "type": "application/a2a-agent-card+json",
      "url": "https://tttkmbb.com/.well-known/agent-card.json",
      "description": "A2A 0.3.0 agent at https://tttkmbb.com/a2a; one skill per calculator plus search_calculators. Synchronous tasks, no auth.",
      "capabilities": [
        "search_calculators",
        "run_calculator"
      ],
      "representativeQueries": [
        "monthly payment on a 300000 mortgage at 6%",
        "compound interest on 10000 for 5 years",
        "what is my BMI at 70 kg and 175 cm",
        "how many calories do I burn per day"
      ],
      "tags": [
        "calculator",
        "a2a"
      ],
      "version": "1.0.0",
      "updatedAt": "2026-09-23"
    },
    {
      "identifier": "urn:air:tttkmbb.com:api:calculators-v1",
      "displayName": "Calcgrid REST API v1",
      "type": "application/openapi+json",
      "url": "https://tttkmbb.com/openapi.json",
      "description": "OpenAPI 3.1 description of GET /api/v1/calculate/{calculator_id} for every calculator plus list, search, schema, convert and status endpoints.",
      "capabilities": [
        "list_calculators",
        "search_calculators",
        "get_calculator_schema",
        "run_calculator",
        "convert_units"
      ],
      "representativeQueries": [
        "what is my BMI at 70 kg and 175 cm",
        "how many calories do I burn per day",
        "pace for a 10 km run in 50 minutes",
        "predict my marathon time from a half marathon"
      ],
      "tags": [
        "calculator",
        "rest",
        "openapi"
      ],
      "version": "v1",
      "updatedAt": "2026-09-23"
    },
    {
      "identifier": "urn:air:tttkmbb.com:docs:llms-txt",
      "displayName": "Calcgrid llms.txt",
      "type": "text/markdown",
      "url": "https://tttkmbb.com/llms.txt",
      "description": "Plain-text overview for language models: capabilities, endpoints, sources, freshness, limitations.",
      "tags": [
        "llms.txt",
        "documentation"
      ],
      "updatedAt": "2026-09-23"
    },
    {
      "identifier": "urn:air:tttkmbb.com:dataset:calculator-catalog",
      "displayName": "Calcgrid calculator catalog",
      "type": "application/json",
      "url": "https://tttkmbb.com/api/v1/calculators",
      "description": "Machine-readable list of all 184 calculators with ids, inputs and documentation URLs.",
      "tags": [
        "catalog",
        "dataset"
      ],
      "updatedAt": "2026-09-23"
    }
  ]
}