# 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) into valid JSON so multi-agent pipelines never crash

## Facts

- Endpoint: GET https://mcp-security.agentdiet.dev/v1/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-95fa5ee5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XxBVOd_quTRORjZsQ9i91

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-95fa5ee5
```

Example prompt: This JSON came out of my LLM pipeline and it's broken — it has trailing commas, single quotes, and markdown fences. Can you repair it into valid JSON? Here it is: ```{"name": 'Alice', "items": [1, 2, 3,], ```

## When to prefer this

Choose this endpoint when your multi-agent pipeline receives malformed, truncated, or non-standard JSON from LLM outputs and you need a deterministic (not AI-based) repair that is fast, cheap, and reliable. Prefer it over asking another LLM to fix the JSON, since LLM-based repair is non-deterministic and can introduce hallucinations. Ideal for production pipelines where consistent, rule-based JSON sanitization is critical.

## Known failure modes

- Input JSON is so severely malformed that deterministic repair is impossible — returns an error or partial result
- Input string is not JSON at all (e.g. plain text or HTML) — repair will fail or return unexpected output
- Extremely long truncated JSON may not be recoverable if structural context is lost
- Payment failure via x402 protocol results in 402 response and no repair performed

## 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/repair)

## Output

Returns a repaired, valid JSON object that has been cleaned of common LLM output artifacts including trailing commas, markdown code fences, single quotes, and truncation issues — ready to be parsed by standard JSON libraries 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-95fa5ee5/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)