# Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router

> Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router is a paid API for AI agents from json-repair.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).

Searches an index of 500+ MCP servers and A2A tools by capability query, returning matching endpoints with token-compressed results and prompt-injection protection.

## Facts

- Endpoint: GET https://json-repair.agentdiet.dev/v1/broker/execute?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: json-repair.agentdiet.dev
- Website: https://json-repair.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/json-repair-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-14816238
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_crKeIQ0GFZ_MGjB3RTjyI

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 json-repair-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-14816238
```

Example prompt: Search the MCP and A2A tool index for any servers that can handle SEC filings or company enrichment — I want to find what's available without connecting to each one individually.

## When to prefer this

Use this endpoint when an AI agent needs to discover which MCP servers or A2A tools exist for a given capability without manually connecting to hundreds of individual servers. It is especially valuable when building dynamic agent pipelines that need to route tasks to the right tool at runtime, when you want token-compressed metadata to avoid bloating context windows, or when you need prompt-injection protection (Prompt-Guard firewall) before routing to untrusted external tool endpoints.

## Known failure modes

- Empty or vague query returns no matches or irrelevant results
- Query for a niche capability not indexed returns empty result set
- Upstream MCP server index unavailable causes lookup failure
- Malformed query string triggers validation error
- Rate limiting or payment failure (402) blocks the request

## How this service works

Single-connection meta-router indexing 500+ MCP servers & A2A tools with 85% token compression and Prompt-Guard firewall. (Live x402 v2, IETF MPP & MCP endpoint at https://json-repair.agentdiet.dev/v1/broker/execute)

## Output

A structured object listing matching MCP servers or A2A tool endpoints relevant to the capability query, with token-compressed metadata and results filtered through a Prompt-Guard firewall to prevent prompt injection from malicious tool responses.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "query"
 ],
 "properties": {
  "query": {
   "type": "string",
   "minLength": 1,
   "description": "Capability search query (e.g. 'context compression', 'github security', 'sec filings', 'company enrichment') or endpoint URL to verify"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/json-repair-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-14816238/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from json-repair.agentdiet.dev](https://www.zero.xyz/host/json-repair.agentdiet.dev/llms.txt)