# SignalHarness Agent Tool Call Sequence Analyzer

> SignalHarness Agent Tool Call Sequence Analyzer 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).

Analyzes a sequence of agent tool calls provided as JSON and returns structured analysis with warnings and evidence scope.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/agent_tool_call_sequence_analyze/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-call-sequence-analyzer-cde29e77
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GCYfHjt9ck9tGlffZ7aBc

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-call-sequence-analyzer-cde29e77 -d '<json body>'
```

Example prompt: Can you analyze this sequence of tool calls my agent made and tell me if there are any issues or warnings? Here's the JSON log of the calls it made.

## When to prefer this

Choose this endpoint when you need a pay-per-call, agent-native analysis of tool call sequences without standing up your own analysis infrastructure. Particularly useful for debugging multi-step agent workflows, auditing tool use patterns, or validating call ordering in an x402/Base USDC payment context.

## Known failure modes

- Malformed or non-JSON request_json input may cause parsing errors
- Input exceeding 65536 characters will be rejected
- Ambiguous or incomplete tool call sequences may yield low-confidence analysis
- Payment failure via x402 will prevent execution
- Response may include warnings about unverified caller-supplied data

## 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 structured findings, a list of warnings (e.g. about caller-supplied data trust), the service_id, and an evidence_scope field indicating the data source. Also includes a full receipt with payment and execution metadata (network, latency, amount, result hash).

## 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_call_sequence_analyze",
   "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_call_sequence_analyze",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "10000",
   "resultSha256": "88456da2da9b5e20231cd59b03e0eda308544c3190d240f42e812e63c7766539",
   "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-call-sequence-analyzer-cde29e77/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)