Runtime guards for AI agents.

A small TypeScript layer that adds cost caps, token limits, timeouts, and retry controls around existing model or tool calls.

Why

Agent calls can loop, retry, and quietly burn budget. guard-sdk centralizes runtime limits so teams stop scattering budget checks across every provider integration.

guard.run() wraps any async call in bounded execution.
guard.createRun() tracks multi-step loops with shared limits.
Usage summaries include retries, call count, duration, and cost estimate.

Quickstart

import { createJsonFileLogger, guard } from "@guard-sdk/core";

const { data, usage } = await guard.run(
  async () => callLLM(),
  {
    name: "summarize-report",
    maxCostUsd: 1,
    maxTokens: 5000,
    maxCalls: 3,
    maxRetries: 2,
    timeoutMs: 30000,
    logger: createJsonFileLogger({
      filePath: "./.guard/usage.jsonl",
    }),
  },
);

timeoutMs is best-effort: guard rejects on timeout, but the underlying IO must support cancellation for hard interruption.

Packages

Browse package details in Docs.

API Structure

The API reference pages are generated from each package entry file at build time. Use API Spec to inspect exports grouped by package.