# 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 a meta-index of 500+ MCP servers and A2A tools by capability query, returning compressed, firewall-screened tool metadata via a single connection.

## Facts

- Endpoint: GET https://json-repair.agentdiet.dev/v1/tool-broker?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-c4f8b28b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0XoLPdNgAEf362WHpaCwz

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-c4f8b28b
```

Example prompt: Search the tool broker for MCP servers that can handle SEC filings retrieval — I need to find a capable, vetted tool I can route through for my agent pipeline.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover, search, or route to external MCP servers or A2A tools without maintaining its own registry. Ideal for swarm orchestration scenarios where a single-connection meta-router with built-in firewall protection and token compression is preferred over manually curating tool lists.

## Known failure modes

- Empty query string returns validation error
- No matching tools found for obscure capability queries returns empty result set
- Endpoint URL verification may return unverified status if URL is not indexed
- Rate limiting or payment failure (x402) may block access
- Prompt-Guard firewall may reject queries containing adversarial or injection-like patterns

## 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/tool-broker)

## Output

Returns a compressed, Prompt-Guard-screened list of matching MCP servers or A2A tools from the meta-index, with up to 85% token reduction compared to raw tool manifests. Includes tool names, capability descriptions, and routing metadata relevant to the query.

## 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-c4f8b28b/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)