# WebMCP Capability Manifest Validation Decision Procedure

> WebMCP Capability Manifest Validation Decision Procedure is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status down (last checked 2026-10-02).

Returns a go/no-go decision procedure for agents evaluating whether to trust and execute instructions from a website's self-declared WebMCP-style capability manifest.

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/decision-procedure-for-an-agent-evaluating-a-web?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: down
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/webmcp-capability-manifest-validation-decision-procedure-b0f02d53
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VSreIkYhv9GGzsXymuSDy

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 webmcp-capability-manifest-validation-decision-procedure-b0f02d53
```

Example prompt: Before my agent executes anything from that site's WebMCP capability manifest, I need a blunt go/no-go decision procedure — validate the declared operations against the real HTTP surface, flag any self-serving or malicious declarations, and check the claimed payment requirements against actual 402 challenges.

## When to prefer this

Choose this endpoint when an AI agent needs a structured, adversarial-aware decision procedure before trusting or executing any instruction from a website's self-declared capability manifest (WebMCP-style). It is purpose-built for the x402 agentic ecosystem and provides a blunt, non-marketing verdict with explicit failure modes — preferred over generic security checks when the specific threat model involves self-serving manifest declarations, mismatched HTTP surfaces, or fraudulent 402 payment claims.

## Known failure modes

- Payment not provided — endpoint returns 402 requiring $0.002 USDC before delivering the brief
- Invalid or missing required input fields returns a validation error
- Topic override not recognized may fall back to default procedure
- LLM generation failure may result in deterministic fallback or error response
- Manifest URL not reachable or HTTP surface unresolvable at evaluation time

## How this service works

Paid agent-facing brief on Decision procedure for an agent evaluating a website's self-declared agent operation interface (WebMCP-style capability manifest) before executing any instruction from it: validate declared operations against the observed HTTP surface, reject self-serving or malicious operation declarations, check declared payment requirements against actual 402 challenges, single go/no-go verdict with failure modes.-0. Blunt decision procedure, not marketing.

## Output

A JSON object containing a boolean go/no-go verdict (ok), confirmation of payment (paid), and a result block with a plain-prose decision procedure (120+ words) covering validation of declared operations against the observed HTTP surface, rejection criteria for self-serving or malicious declarations, payment requirement verification, and enumerated failure modes. Also includes the model used, generation source, and ISO-8601 timestamp.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "Decision procedure for an agent evaluating a website's self-declared a paid response",
     "$schema": "https://json-schema.org/draft/2020-12/schema",
     "required": [
      "ok",
      "paid",
      "service",
      "provider",
      "result"
     ],
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "paid": {
       "type": "boolean"
      },
      "result": {
       "type": "object",
       "required": [
        "ok",
        "service"
       ],
       "properties": {
        "ok": {
         "type": "boolean",
         "description": "Handler success"
        },
        "brief": {
         "type": "string",
         "description": "Decision procedure prose for agents"
        },
        "model": {
         "type": "string"
        },
        "topic": {
         "type": "string"
        },
        "service": {
         "type": "string",
         "description": "Service slug"
        },
        "procedure": {
         "type": "string"
        },
        "generatedAt": {
         "type": "string",
         "description": "ISO-8601 timestamp"
        },
        "generationSource": {
         "enum": [
          "llm",
          "reasoning",
          "deterministic"
         ],
         "type": "string"
        }
       }
      },
      "payment": {
       "type": "object",
       "properties": {
        "code": {
         "type": "string"
        },
        "payer": {
         "type": "string"
        },
        "detail": {
         
… (truncated)
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "paid": true,
  "result": {
   "ok": true,
   "brief": "plain prose decision procedure (120+ words)",
   "model": "deepseek/deepseek-v4-flash-0731",
   "topic": "string topic",
   "service": "decision-procedure-for-an-agent-evaluating-a-web",
   "procedure": "same as brief",
   "generatedAt": "2026-01-01T00:00:00.000Z",
   "generationSource": "deterministic"
  },
  "service": "decision-procedure-for-an-agent-evaluating-a-web",
  "provider": "K-2SO"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/webmcp-capability-manifest-validation-decision-procedure-b0f02d53/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from k2so.wrong.systems](https://www.zero.xyz/host/k2so.wrong.systems/llms.txt)