# MCP Discovery Decision

> MCP Discovery Decision is a paid API for AI agents from agentreadiness.halowerk.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-14).

Passively fetches public evidence from a target URL and evaluates whether it exposes an MCP (Model Context Protocol) discovery endpoint, returning a verdict, evidence source, and recommended action.

## Facts

- Endpoint: POST https://agentreadiness.halowerk.com/v1/mcp-discovery-decision?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mcp-discovery-decision-6bb936c5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sRu5Wcr2GKHTTUywkp9mr

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 mcp-discovery-decision-6bb936c5 -d '<json body>'
```

Example prompt: Can you check whether https://api.example.com supports MCP discovery — I want to know if it exposes the right endpoints for AI agent integration, along with what evidence was found and any recommended next steps?

## When to prefer this

Use this endpoint when you need a passive, non-intrusive check of whether a specific public URL or domain advertises MCP discovery capabilities. Prefer it over generic HTTP probing when you want a structured verdict with evidence sourcing, thresholds, and recommended actions rather than a raw HTTP response. Ideal for pre-integration checks, partner audits, and automated agent-readiness pipelines where no login or payload injection is acceptable.

## Known failure modes

- Target URL is unreachable or returns non-2xx status, resulting in no evidence and an inconclusive verdict
- Domain normalization fails for malformed input URLs
- Target blocks crawler user agents, causing evidence gaps and a limited verdict
- MCP discovery endpoint exists but is behind authentication, which passive inspection cannot evaluate
- Rate limiting or timeouts on the target produce incomplete evidence

## How this service works

MCP discovery decision fetches current public evidence from the supplied target and evaluates the documented criterion. It returns the observation, threshold, verdict, exact evidence source, limitations and a mode-specific action. The check is passive: no login attempt, payload injection, exploit, purchase, form submission or load test is performed.

## Output

Returns a structured assessment including: the observed evidence from the target URL, the threshold criteria applied, a pass/fail/unknown verdict, the exact evidence source URL, any limitations of the passive inspection, and a recommended mode-specific action the caller should take next.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "target": {
   "type": "string",
   "maxLength": 2048,
   "minLength": 3,
   "description": "Public HTTP(S) URL or domain to inspect. A bare domain is normalized to HTTPS."
  },
  "context": {
   "type": "object",
   "description": "Optional non-secret correlation labels returned unchanged only in the request lifecycle.",
   "maxProperties": 12,
   "additionalProperties": {
    "type": [
     "string",
     "number",
     "boolean",
     "null"
    ]
   }
  },
  "baseline": {
   "type": [
    "object",
    "null"
   ],
   "description": "Optional baseline returned by a previous snapshot call.",
   "additionalProperties": true
  },
  "compare_url": {
   "type": "string",
   "maxLength": 2048,
   "minLength": 3,
   "description": "Optional public comparison URL. Used by change and monitoring services."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mcp-discovery-decision-6bb936c5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentreadiness.halowerk.com](https://www.zero.xyz/host/agentreadiness.halowerk.com/llms.txt)