# Deterministic A2A Broken-JSON Repair & Schema Validator

> Deterministic A2A Broken-JSON Repair & Schema Validator is a paid API for AI agents from prompt-guard.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) so multi-agent pipelines never crash.

## Facts

- Endpoint: GET https://prompt-guard.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: prompt-guard.agentdiet.dev
- Website: https://prompt-guard.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/prompt-guard-agentdiet-dev-deterministic-a2a-broken-json-repair-9a6e7e44
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qLkJoUsoBu5VaHr6sVxsg

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 prompt-guard-agentdiet-dev-deterministic-a2a-broken-json-repair-9a6e7e44
```

Example prompt: Fix this broken JSON from the LLM response — it has trailing commas and markdown fences and is crashing my pipeline: ```{"name": "Alice", "score": 42,}```

## When to prefer this

Choose this endpoint when your multi-agent pipeline receives LLM-generated JSON that fails standard parsing due to common issues like trailing commas, markdown code fences, single-quoted keys, or truncation. It is especially suited for deterministic, rule-based repair rather than AI-based guessing, making it reliable for production pipelines where consistency matters. Prefer it over manual regex hacks or custom parsers when you need a maintained, hosted solution with predictable behavior.

## Known failure modes

- Input JSON is too severely malformed to deterministically repair — returns error indicating repair failure
- Missing required raw_json parameter — returns 400 bad request
- JSON is ambiguous in its truncation point — repair may not match original intent
- Payment not completed via x402 — returns 402 Payment Required
- Service unavailable or timeout — returns 5xx error

## 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://prompt-guard.agentdiet.dev/v1/repair)

## Output

Returns a repaired, valid JSON object derived from the malformed input — with trailing commas removed, markdown fences stripped, single quotes normalized to double quotes, and truncated structures closed where possible.

## 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/prompt-guard-agentdiet-dev-deterministic-a2a-broken-json-repair-9a6e7e44/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from prompt-guard.agentdiet.dev](https://www.zero.xyz/host/prompt-guard.agentdiet.dev/llms.txt)