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* AgentKits — Code Interpreter Module
*
* Safe JavaScript code execution sandbox for LLM tool use.
*
* Usage:
* import { createCodeInterpreter } from 'agentkits/code-interpreter';
* const interpreter = createCodeInterpreter();
* const result = await interpreter.execute('return 2 + 2');
*/
import { setTimeout as sleep } from 'node:timers/promises';
// ── Types ──────────────────────────────────────────────────────────
export interface CodeInterpreterConfig {
timeout?: number;
sandbox?: Record<string, unknown>;
allowRequire?: boolean;
}
export interface ExecutionResult {
success: boolean;
output: string;
error?: string;
duration: number;
}
export interface CodeInterpreterClient {
/** Execute JavaScript code in sandbox */
execute(code: string, options?: { timeout?: number }): Promise<ExecutionResult>;
/** Execute and return structured result */
eval(expression: string): Promise<ExecutionResult>;
/** Get as function-calling tool definition */
readonly toolDefinition: { type: 'function'; function: { name: string; description: string; parameters: Record<string, unknown> } };
}
// ── Factory ────────────────────────────────────────────────────────
export function createCodeInterpreter(config: CodeInterpreterConfig = {}): CodeInterpreterClient {
const defaultTimeout = config.timeout ?? 10000;
const baseSandbox = {
console: {
log: (...args: unknown[]) => logs.push(args.map(String).join(' ')),
error: (...args: unknown[]) => logs.push('[ERROR] ' + args.map(String).join(' ')),
warn: (...args: unknown[]) => logs.push('[WARN] ' + args.map(String).join(' ')),
},
JSON,
Math,
Date,
Array,
Object,
String,
Number,
Boolean,
RegExp,
Map,
Set,
parseInt,
parseFloat,
isNaN,
isFinite,
...config.sandbox,
};
let logs: string[] = [];
async function run(code: string, timeout: number): Promise<ExecutionResult> {
logs = [];
const start = Date.now();
try {
// Use Function constructor for sandboxed execution
const fn = new Function('sandbox', `with(sandbox) { ${code} }`);
const result = fn(baseSandbox);
const output = logs.length > 0
? logs.join('\n') + (result !== undefined ? '\n→ ' + JSON.stringify(result) : '')
: (result !== undefined ? JSON.stringify(result) : '(no output)');
return {
success: true,
output,
duration: Date.now() - start,
};
} catch (e: unknown) {
return {
success: false,
output: logs.join('\n'),
error: e instanceof Error ? e.message : String(e),
duration: Date.now() - start,
};
}
}
return {
async execute(code, options = {}) {
return run(code, options.timeout ?? defaultTimeout);
},
async eval(expression) {
return run(`return (${expression})`, defaultTimeout);
},
get toolDefinition() {
return {
type: 'function' as const,
function: {
name: 'code_interpreter',
description: 'Execute JavaScript code and return the result. Use for calculations, data processing, etc.',
parameters: {
type: 'object',
properties: {
code: { type: 'string', description: 'JavaScript code to execute' },
},
required: ['code'],
},
},
};
},
};
}
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