# 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) so multi-agent pipelines never crash

## Facts

- Endpoint: GET https://mcp-security.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: 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-1f9e9637
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DQofRnwQ6ynpnfH8OxWFF

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-1f9e9637
```

Example prompt: My LLM just returned this broken JSON with trailing commas and markdown fences — can you repair it so the pipeline doesn't crash? Here's the raw output: ```{"name": "Alice", "score": 42,}```

## When to prefer this

Choose this endpoint when your multi-agent pipeline receives JSON from an LLM that fails standard JSON.parse() due to common LLM artifacts (trailing commas, markdown fences, single quotes, or truncation). Prefer this over generic JSON parsers when you need deterministic, rule-based repair rather than probabilistic reconstruction, and when your pipeline demands reliability without crashes.

## Known failure modes

- JSON is so severely malformed that deterministic repair is impossible
- Input string is not JSON at all (plain text, HTML, etc.)
- Truncation is too severe to infer missing structure
- Schema mismatch if the repaired JSON doesn't match an expected schema
- Empty or whitespace-only input returns an 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://mcp-security.agentdiet.dev/v1/llm-json-schema-healer)

## Output

A repaired, valid JSON object that has been cleaned of common LLM output artifacts such as trailing commas, markdown fences, single quotes, and truncation issues — ready for downstream parsing and processing in agent pipelines.

## 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-1f9e9637/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)