different-ai/openwork · error · InterpreterRuntimeError

Array.${name} is not available in CodeMode.

Error message

Array.${name} is not available in CodeMode.

What it means

Only a fixed set of Array statics (isArray, of, from) is implemented in invokeArrayStatic. Any other Array.* static call hits the default branch and throws this error. The sandbox intentionally exposes a minimal, deterministic API surface.

Source

Thrown at packages/codemode/src/interpreter/runtime.ts:547

        return Array.from((args[0] as SandboxMap).map.entries(), ([key, item]) => [key, item])
      if (args[0] instanceof SandboxSet) return Array.from((args[0] as SandboxSet).set.values())
      if (args[0] instanceof SandboxURLSearchParams) {
        return Array.from(args[0].params.entries(), ([key, value]) => [key, value])
      }
      const source = boundedData(args[0], "Array.from input")
      if (typeof source === "string") return Array.from(source)
      if (Array.isArray(source)) return [...source]
      if (
        source !== null &&
        typeof source === "object" &&
        typeof (source as { length?: unknown }).length === "number"
      ) {
        return Array.from(source as ArrayLike<unknown>)
      }
      throw new InterpreterRuntimeError("Array.from expects an array, string, Map, Set, or array-like value.", node)
    }
    default:
      throw new InterpreterRuntimeError(`Array.${name} is not available in CodeMode.`, node)
  }
}

const invokeGlobalMethod = (ref: GlobalMethodReference, args: Array<unknown>, node: AstNode): unknown => {
  if (ref.namespace === "console")
    throw new InterpreterRuntimeError(`console.${ref.name} is not available in CodeMode.`, node)
  if (ref.namespace === "Object") return invokeObjectMethod(ref.name, args, node)
  if (ref.namespace === "Math") return invokeMathMethod(ref.name, args, node)
  if (ref.namespace === "Array") return invokeArrayStatic(ref.name, args, node)
  if (ref.namespace === "Number") return invokeNumberStatic(ref.name, args, node)
  if (ref.namespace === "String") return invokeStringStatic(ref.name, args, node)
  if (ref.namespace === "URL") return invokeURLStatic(ref.name, args, node)
  if (ref.namespace === "Date") {
    if (!dateStatics.has(ref.name))
      throw new InterpreterRuntimeError(`Date.${ref.name} is not available in CodeMode.`, node)
    return invokeDateStatic(ref.name, args, node)
  }
  if (

View on GitHub (pinned to 2b7df46e8a)

Solutions

  1. Restrict to Array.isArray, Array.of, and single-argument Array.from
  2. Fix typos (Array.form -> Array.from)
  3. Implement missing helpers manually with supported syntax (loops, spread)
  4. Perform unsupported operations via a tool call instead of inline CodeMode

Example fix

// before
const filled = Array.from({length: 3}, () => 0); // also rejected
const isArr = Array.instanceOf(x); // not a real API -> throws
// after
const isArr = Array.isArray(x);
Defensive patterns

Strategy: try-catch

Validate before calling

const supportedArrayStatics = ['isArray','of','from'];
if (/Array\.[A-Za-z_$][\w$]*\s*\(/.test(code)) {
  for (const m of code.matchAll(/Array\.([A-Za-z_$][\w$]*)\s*\(/g)) {
    if (!supportedArrayStatics.includes(m[1])) throw new Error(`Array.${m[1]} unsupported in CodeMode`);
  }
}

Type guard

function arrayStaticSupported(name) { return ['isArray','of','from'].includes(name); }

Try / catch

try {
  result = invokeCodeMode(code);
} catch (e) {
  if (String(e.message).startsWith('Array.')) {
    // fall back to a host-side implementation of the static
  } else throw e;
}

Prevention

When it happens

Trigger: Calling unsupported Array statics inside CodeMode such as Array.fromAsync, Array.prototype-flavored statics like Array.flat (mistaken), or hypothetical Array.zip/pair helpers; any Array.<name> not matching isArray/of/from.

Common situations: Using newer or exotic Array statics; typos like Array.form instead of Array.from (hits default branch); assuming Node's full global Array surface exists in the sandbox.

Related errors

AI-assisted analysis of different-ai/openwork@2b7df46e8a (2026-09-01). Data as JSON: /api/errors/9dc576cce87753e2. Report an issue: GitHub.