# 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).

Repairs truncated or malformed LLM JSON outputs (trailing commas, markdown fences, single quotes, truncation) so multi-agent pipelines can continue without crashing.

## Facts

- Endpoint: GET https://mcp-security.agentdiet.dev/v1/json-validator?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-ada24f2d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ZSWlgX3NK3ldauHAncsu0

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-ada24f2d
```

Example prompt: This JSON string from the LLM is broken — it has trailing commas and markdown fences — can you repair it so I can use it? Here it is: ```{"name": "Alice", "age": 30,}```

## When to prefer this

Choose this endpoint when your multi-agent pipeline receives LLM-generated JSON that fails standard JSON.parse() due to common LLM formatting issues (trailing commas, markdown fences, single quotes, truncation). It is purpose-built for AI pipeline robustness rather than general-purpose schema validation tools, and is ideal when you need a deterministic, lightweight fix rather than an LLM-based re-generation of the JSON.

## Known failure modes

- Input JSON is so severely malformed that deterministic repair is impossible — returns error
- Empty or null raw_json parameter — returns validation error
- Input is not JSON at all (plain text, binary data) — may return error or unexpected output
- Ambiguous truncation where the intended structure cannot be inferred — partial or incorrect repair

## 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-validator)

## Output

A repaired, valid JSON object derived from the malformed input. The endpoint deterministically fixes issues like trailing commas, single quotes instead of double quotes, markdown code fence wrappers, and truncated structures, returning a clean JSON payload ready for downstream consumption.

## 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-ada24f2d/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)