# Deterministic A2A Broken-JSON Repair & Schema Validator

> Deterministic A2A Broken-JSON Repair & Schema Validator is a paid API for AI agents from 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://agentdiet.dev/v1/llm-json-schema-healer?utm_source=zero.xyz
- Price: $0.002/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: agentdiet.dev
- Website: https://agentdiet.dev
- Canonical page: https://www.zero.xyz/c/agentdiet-dev-deterministic-a2a-broken-json-repair-schema-validator-3d9711c7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4K8XbrNtxA1y5U0JHFU55

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 agentdiet-dev-deterministic-a2a-broken-json-repair-schema-validator-3d9711c7
```

Example prompt: The LLM just returned this broken JSON with trailing commas and markdown fences — can you repair it so it parses correctly: ```{"name": "Alice", "age": 30,}```?

## When to prefer this

Choose this endpoint when your multi-agent pipeline receives LLM-generated JSON that fails JSON.parse() due to common LLM output artifacts like trailing commas, markdown code fences, single quotes instead of double quotes, or truncation from token limits. Prefer this over manual regex cleaning or LLM re-prompting when you need deterministic, fast, cheap repair ($0.002/call) without model inference overhead.

## Known failure modes

- Input JSON is so severely malformed that deterministic repair is impossible, returning an error
- Input string is empty or missing the raw_json parameter (validation error)
- JSON structure is ambiguous after repair, producing a best-guess output that may not match original intent
- Very large or deeply nested broken JSON may time out or return partial 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://agentdiet.dev/v1/llm-json-schema-healer)

## Output

A JSON object containing the deterministically repaired, syntactically valid version of the input malformed JSON string, ready for downstream parsing without throwing 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/agentdiet-dev-deterministic-a2a-broken-json-repair-schema-validator-3d9711c7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentdiet.dev](https://www.zero.xyz/host/agentdiet.dev/llms.txt)