# SignalHarness Agent Plan Dependency Check

> SignalHarness Agent Plan Dependency Check is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-15).

Analyzes a submitted agent plan or task graph in JSON format to identify dependency issues, ordering conflicts, or structural warnings.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/agent_plan_dependency_check/invoke
- Price: $0.015/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-plan-dependency-check-8e8bbe29
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xWKLs2ffLoz_tD7LFDSxV

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-plan-dependency-check-8e8bbe29 -d '<json body>'
```

Example prompt: Can you check this agent plan JSON for dependency issues or ordering conflicts before I run it? Here's the plan: {"steps":[{"id":"A","depends_on":[]},{"id":"B","depends_on":["A"]},{"id":"C","depends_on":["B","D"]}]}.

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call programmatic check of an agent plan's dependency structure before execution — especially in agentic pipelines where a bad plan ordering could cause cascading failures. It is particularly useful when plans are auto-generated by LLMs and need a structural sanity check. Prefer this over manual review when plans are large, dynamically generated, or need to be validated at runtime with an auditable receipt.

## Known failure modes

- Malformed or invalid JSON in request_json field causes a parse error
- request_json string shorter than 2 or longer than 65536 characters is rejected
- Payment failure or insufficient USDC balance blocks execution
- Caller-supplied data may produce warnings about unverifiable assumptions (evidence_scope: caller_supplied_data)
- Timeout or network error on the Base network during settlement

## 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 analysis result containing a list of dependency warnings, the service ID, an analysis_json field with structured findings, and an evidence_scope field indicating the data used. Also includes a receipt with payment details, execution timing, a SHA-256 result hash, and network settlement information on Base.

## 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_plan_dependency_check",
   "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_plan_dependency_check",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "15000",
   "resultSha256": "d0c51ca065ed5fe1010ffc4eccb3bafcc3d45fc71d7b5c4f155619601befc196",
   "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-plan-dependency-check-8e8bbe29/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)