HumanLatch JavaScript SDK

JavaScript/TypeScript SDK for sending AI-driven capability proposals to a HumanLatch control plane.

Use this SDK when your app, agent, robot controller, chatbot, or manufacturing system needs to ask:

• Can I run this capability automatically?
• Do I need a human approval first?
• Is this blocked by policy?

The SDK works against either:

• self-hosted HumanLatch CE
• a remotely hosted HumanLatch API

Install

npm install @verdictlayer/humanlatch-sdk

This package is intended for npm publication as @verdictlayer/humanlatch-sdk.

Create a Client

import { HumanLatchClient } from "@verdictlayer/humanlatch-sdk";

const client = new HumanLatchClient({
  baseUrl: "https://your-humanlatch.example.com",
  workspaceId: "your-workspace-id",
  apiKey: process.env.HUMANLATCH_API_KEY,
});

Use token for user-authenticated flows or apiKey for agent/service integrations.

Core Flow

const result = await client.proposeAction({
  action_type: "support.refund.issue",
  target: "order-10428",
  summary: "Issue a refund above the autonomous threshold",
  payload: {
    amount: 850,
    currency: "USD",
    customer_id: "cust_2041",
  },
  context: {
    environment: "production",
    requested_by: "agent:support-bot",
    domain: "chatbot",
  },
});

if (client.isApproved(result)) {
  await issueRefund();
} else if (client.requiresApproval(result)) {
  const final = await client.waitForDecision(result.id, { intervalMs: 2000, timeoutMs: 30000 });
  if (client.isApproved(final)) {
    await issueRefund();
  }
} else if (client.isBlocked(result)) {
  throw new Error("Blocked by HumanLatch policy");
}

What You Send

Every proposed capability should include:

• action_type: machine-readable capability name
• target: thing being affected
• summary: human-readable explanation
• payload: structured execution details
• context: environment, source, actor, and policy context

Domain Examples

Cloud / DevOps

await client.proposeAction({
  action_type: "aws.iam.policy_change",
  target: "prod-admin-role",
  summary: "Attach elevated access to a production IAM role",
  payload: {
    policy_arn: "arn:aws:iam::aws:policy/AdministratorAccess",
  },
  context: {
    environment: "production",
    requested_by: "agent:terraform-bot",
    domain: "cloud",
  },
});

Chatbot / Customer Operations

await client.proposeAction({
  action_type: "support.refund.issue",
  target: "order-10428",
  summary: "Issue a refund above the autonomous threshold",
  payload: {
    amount: 850,
    currency: "USD",
  },
  context: {
    environment: "production",
    requested_by: "agent:support-bot",
    domain: "chatbot",
  },
});

Robotics

await client.proposeAction({
  action_type: "robot.motion.execute",
  target: "cell-7-arm-a",
  summary: "Move a robot into a maintenance zone",
  payload: {
    command: "enter_maintenance_zone",
    speed: "reduced",
  },
  context: {
    environment: "factory",
    requested_by: "agent:cell-controller",
    domain: "robotics",
  },
});

Manufacturing

await client.proposeAction({
  action_type: "manufacturing.line.override",
  target: "line-3",
  summary: "Override a conveyor safety threshold",
  payload: {
    threshold: 0.92,
    duration_seconds: 180,
  },
  context: {
    environment: "production",
    requested_by: "agent:line-optimizer",
    domain: "manufacturing",
  },
});

Additional Methods

await client.listActions({ status: "pending_approval", limit: 50 });
await client.getAction("action-id");
await client.approveAction("action-id", { note: "Approved by supervisor" });
await client.rejectAction("action-id", "Unsafe during shift handoff");
await client.cancelAction("action-id");
await client.waitForDecision("action-id", { intervalMs: 2000, timeoutMs: 30000 });

Integration Model

HumanLatch is not tied to one domain.

Your app keeps its own UI, runtime, and execution engine. Before it performs a sensitive capability, it asks HumanLatch for a decision:

• approved_auto: execute now
• pending_approval: wait for human approval
• blocked: do not execute

That same control plane works for:

• infrastructure agents
• support bots
• warehouse robots
• manufacturing lines
• internal copilots