get_constant

Instructions

Implementation Reference

• cruncher.js:509-546 (schema)

  The tool schema/definition for get_constant, including its inputSchema with an enum of constant names (pi, e, tau, phi, etc.) and required parameter 'name'.

  {
      name: "get_constant",
      annotations: {
          title: "Get Constant",
          readOnlyHint: true,
          destructiveHint: false,
          idempotentHint: true,
          openWorldHint: false,
      },
      description:
          "Returns a mathematical, physical, or chemical constant. See enum values.",
      inputSchema: {
          type: "object",
          properties: {
              name: {
                  type: "string",
                  enum: [
                      "pi",
                      "e",
                      "tau",
                      "phi",
                      "sqrt2",
                      "euler_mascheroni",
                      "c",
                      "g",
                      "G",
                      "h",
                      "k",
                      "R",
                      "NA",
                      "e_charge",
                      "m_e",
                      "m_p",
                  ],
              },
          },
          required: ["name"],
      },

• cruncher.js:1485-1488 (handler)

  The handler function for the get_constant tool. Looks up the constant name in the CONSTANTS object and returns its value, or throws if unknown.

  get_constant: ({ name }) => {
      if (name in CONSTANTS) return CONSTANTS[name];
      throw new Error(`Unknown constant: ${name}`);
  },

• cruncher.js:173-192 (helper)

  The CONSTANTS object shared between get_constant and evaluate_expression, containing mathematical (pi, e, tau, phi, sqrt2, euler_mascheroni) and physical/chemical (c, g, G, h, k, R, NA, e_charge, m_e, m_p) constants with their values.

  const CONSTANTS = {
      // Math
      pi: Math.PI,
      e: Math.E,
      tau: 2 * Math.PI,
      phi: 1.618033988749895,
      sqrt2: Math.SQRT2,
      euler_mascheroni: 0.5772156649015329,
      // Physics (SI Units)
      c: 299792458,
      g: 9.80665,
      G: 6.6743e-11,
      h: 6.62607015e-34,
      k: 1.380649e-23,
      R: 8.314462618,
      NA: 6.02214076e23,
      e_charge: 1.602176634e-19,
      m_e: 9.1093837015e-31,
      m_p: 1.67262192369e-27,
  };

• cruncher.js:130-145 (registration)

  Registration of get_constant in the MAIN_THREAD_TOOLS set, meaning it runs directly on the main thread without worker overhead for performance.

  const MAIN_THREAD_TOOLS = new Set([
      // Angle management
      "set_angle_mode", "get_angle_mode",
      // Trigonometry (instant Math calls)
      "sine", "cosine", "tangent", "asin", "acos", "atan",
      // Cache management
      "cache_clear", "cache_info",
      // Simple stats (zero-cost)
      "count", "min", "max", "variance", "std_dev",
      // Percentage
      "percentage_of", "percentage_change", "percentage_reverse",
      // Math one-liners
      "power", "sqrt", "logarithm", "natural_log", "absolute",
      // Constant lookup
      "get_constant",
      // Memory recall (single variable read)