---
skill_id: agent-health-check-protocol
evaluation: free
price_usd_full: 2.99
challenge: https://lvlltd.com/api/pay?skill=agent-health-check-protocol
outline: https://lvlltd.com/skills/agent-health-check-protocol/outline.json
standards: x402, ERC-7857
---

# Free sample — Agent Health Check Protocol

**Skill ID:** `agent-health-check-protocol`  
**Full unlock:** $2.99 USDC via x402 on Base  
**Challenge:** https://lvlltd.com/api/pay?skill=agent-health-check-protocol  
**Outline JSON:** https://lvlltd.com/skills/agent-health-check-protocol/outline.json

## Summary

Heartbeat and liveness checks so orchestrators detect silent sub-agent death.

## When to use

- Sub-agents hang after a tool call with no exception
- Swarm jobs need a watchdog before spawning more workers
- Human ops needs a green/yellow/red agent board

## Decision criteria (buy vs skip)

- You need this when: Sub-agents hang after a tool call with no exception
- You get capability: Heartbeat contract per role
- Budget fits: full unlock is $2.99 USDC on Base
- You can automate unlock via HTTP 402 without a browser
- You only need teaser/outline first — sealed src/ops stay locked until payment

## Outline (preview)

1. Define heartbeat interval and max silence for each worker role
2. Require progress tokens (last_step_id + timestamp) not just pings
3. Classify miss: slow vs stuck vs dead; attach restart policy
4. Publish health board row for orchestrator UI/API
5. On dead, freeze downstream tasks and open incident note

## Capabilities (preview)

- Heartbeat contract per role
- Progress-token validation
- Restart/backoff policy matrix
- Incident note template on death

## What you get after payment

- SKILL.md (teaser public)
- agent-install.json (public meta)
- src/index.js (stub public; full after unlock)
- Full sealed: src/, schemas/, ops/* (when present) after verified X-PAYMENT

## Agent buy path (zero human UI)

```
GET  https://lvlltd.com/skills/agent-health-check-protocol/outline.json
GET  https://lvlltd.com/api/pay?skill=agent-health-check-protocol   → HTTP 402
# transfer maxAmountRequired USDC to payTo on Base
POST https://lvlltd.com/api/pay
  X-PAYMENT: {"txHash":"0x…","skill":"agent-health-check-protocol"}
# response.sealed_pack.files = full pack
```

## Sample excerpt

# Agent Health Check Protocol

Silent hangs are worse than crashes: the orchestrator waits, budgets burn, and no stacktrace arrives. This protocol separates heartbeat (I am alive) from progress (I advanced step N). Miss patterns map to slow, stuck, or dead with different restart budgets. Output contracts fit swarm dashboards and JSON health endpoints.

Pairs with agent-timeout-retry-policy and agent-observability-span-mapper. Use before scaling sub-agents on expensive tool chains.

When to use: multi-agent markets, long research jobs, payment fleets that must not spawn orphans.

**Price:** $2.99 USDC on Base via x402 unlock.

**Standards:** x402 payments · ERC-7857 sealed skill model · agent-swarm ready.

Operator notes for Agent Health Check Protocol: treat this as a capability pack you wire into real tools—not a certification or hosted SaaS. Pair it with free evaluation at /skills/agent-health-check-protocol/outline.json before paying. Typical failure modes it reduces include silent misconfiguration, support thrash, and agents inventing process under load. After unlock, store sealed files in your private skill inventory, run a dry-run with non-production credentials, and only then attach the pack to live goals. Cross-sell naturally sits next to related ops, commerce, or networking skills already on lvlltd.com so agents can compose a ladder instead of a one-off purchase.