# SignalHarness Agent Tool Usage Summary

> SignalHarness Agent Tool Usage Summary is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Accepts caller-supplied JSON data and returns a structured analysis summary of agent tool usage patterns.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/agent_tool_usage_summary/invoke
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signalharness-agent-tool-usage-summary-95b48aef
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PzcQneEs-4-nbahq8LtPs

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability signalharness-agent-tool-usage-summary-95b48aef -d '<json body>'
```

Example prompt: Can you analyze this agent tool usage data and give me a structured summary of what tools were called and any warnings I should know about? Here's the JSON: {"tool_calls": [{"tool": "web_search", "count": 42}, {"tool": "calculator", "count": 7}]}

## When to prefer this

Choose this endpoint when you need a pay-per-call, agent-native summary of tool usage data you've already collected and serialized as JSON. It is best suited for lightweight, on-demand analysis of agent telemetry without requiring a persistent monitoring infrastructure. Prefer it over heavier analytics platforms when you want a single structured result from a discrete JSON payload at minimal cost ($0.01 USDC).

## Known failure modes

- Malformed or invalid JSON in request_json field causes processing failure
- Input JSON exceeding 65536 characters is rejected
- Caller-supplied data that doesn't conform to expected structure may produce warnings rather than meaningful analysis
- Payment failure on the x402/Base USDC layer results in non-execution
- Empty or minimal JSON (under 2 characters) rejected by minLength constraint

## How this service works

Explore 330 pay-per-call x402 API services and 27 agent-native digital products, with Base USDC pricing, secure Polar checkout, and free discovery.

## Output

Returns a JSON object containing an analysis_json field with the structured summary of the caller-supplied tool usage data, a warnings array flagging any data quality or reliability concerns, a service_id confirming the invoked service, and an evidence_scope field indicating the data source. Also includes a full execution receipt with payment details, request/execution IDs, network info, and a result SHA256 hash for verification.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "request_json": {
   "type": "string",
   "maxLength": 65536,
   "minLength": 2
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "replay": false,
  "result": {
   "warnings": [
    "Verify the caller-supplied data before relying on this result."
   ],
   "service_id": "agent_tool_usage_summary",
   "analysis_json": "{\"example\":\"schema-valid caller-supplied data\"}",
   "evidence_scope": "caller_supplied_data"
  },
  "status": "succeeded",
  "receipt": {
   "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
   "usage": [],
   "status": "succeeded",
   "network": "eip155:8453",
   "artifacts": [],
   "endedAtMs": 0,
   "latencyMs": 0,
   "paymentId": "example-payment",
   "receiptId": "example-receipt",
   "requestId": "example-request",
   "serviceId": "agent_tool_usage_summary",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "10000",
   "resultSha256": "de9970025c96fb57a8275f81e26c1fbdef75eaf80127d313193bf0349733ad52",
   "serviceVersion": "1.0.0",
   "settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
  },
  "artifacts": [],
  "requestId": "example-request",
  "executionId": "example-execution"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signalharness-agent-tool-usage-summary-95b48aef/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from signalharness.ai](https://www.zero.xyz/host/signalharness.ai/llms.txt)