# Deterministic A2A Broken-JSON Repair & Schema Validator

> Deterministic A2A Broken-JSON Repair & Schema Validator is a paid API for AI agents from mcp-security.agentdiet.dev, paid per call via MPP, $0.002/call, status unknown (last checked 2026-10-21).

Deterministically repairs malformed, truncated, or markdown-wrapped JSON strings (trailing commas, single quotes, fences) so multi-agent pipelines never crash on bad LLM output.

## Facts

- Endpoint: GET https://mcp-security.agentdiet.dev/v1/json-repair?utm_source=zero.xyz
- Price: $0.002/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: mcp-security.agentdiet.dev
- Website: https://mcp-security.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/mcp-security-agentdiet-dev-deterministic-a2a-broken-json-repair-fe1334e3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FPQxbMJqUzrw0GPUPYb7b

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-security-agentdiet-dev-deterministic-a2a-broken-json-repair-fe1334e3
```

Example prompt: This JSON came back from the LLM but it's broken — it has trailing commas and markdown fences around it. Can you repair it so I can parse it? Here's the raw string: ```{"name": "Alice", "age": 30,}```

## When to prefer this

Choose this endpoint when your multi-agent pipeline receives raw LLM-generated JSON that may be malformed, truncated, or wrapped in markdown fences and you need a deterministic (non-AI) repair that won't hallucinate new fields. Prefer over regex heuristics or custom parsers when you want a single reliable API call that handles the full spectrum of common LLM JSON failures including trailing commas, single quotes, and incomplete structures.

## Known failure modes

- Input is so corrupted that no deterministic repair is possible — returns error or best-effort partial object
- Input string is empty or missing (raw_json not provided) — returns 400 validation error
- JSON is semantically ambiguous after repair (e.g. missing values cannot be inferred) — may return null-padded or incomplete structure
- Payment not included or insufficient — returns HTTP 402 payment required
- Network timeout on the endpoint — no response

## How this service works

Repairs truncated or malformed LLM JSON outputs (trailing commas, markdown fences, single quotes) so multi-agent pipelines never crash. (Live x402 v2, IETF MPP & MCP endpoint at https://mcp-security.agentdiet.dev/v1/json-repair)

## Output

A repaired, valid JSON object reconstructed from the malformed input — with trailing commas removed, markdown fences stripped, single quotes normalized to double quotes, and truncated structures closed — ready for downstream parsing without errors.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "raw_json"
 ],
 "properties": {
  "raw_json": {
   "type": "string",
   "minLength": 1,
   "description": "Malformed, truncated, or markdown-wrapped JSON string to deterministically repair"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mcp-security-agentdiet-dev-deterministic-a2a-broken-json-repair-fe1334e3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcp-security.agentdiet.dev](https://www.zero.xyz/host/mcp-security.agentdiet.dev/llms.txt)