# 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 token-compressed results through a prompt-guard firewall

## Facts

- Endpoint: GET https://json-repair.agentdiet.dev/v1/swarm-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-54e7d384
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RYZVETsoYi5oFrGxGX_au

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-54e7d384
```

Example prompt: Search the MCP and A2A tool index for any servers that handle 'company enrichment' — I want to find what's available and get back the top matching tools with their capabilities.

## When to prefer this

Use this endpoint when an AI agent needs to dynamically discover which MCP servers or A2A tools are available for a given capability, especially within a swarm or multi-agent architecture. Prefer it over hard-coded tool registries when the capability landscape is broad or unknown, or when you need token-efficient results. Also useful for verifying whether a specific endpoint URL is a legitimate, indexed MCP tool before proxying to it.

## Known failure modes

- Empty query string returns 400 validation error
- No matching tools found for obscure capability queries returns empty result set
- Endpoint URL verification may return false negative if target is offline
- Rate limiting or payment failure (402) if x402 micropayment not completed
- Prompt injection attempts blocked by Prompt-Guard firewall, may suppress some results

## 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/swarm-execute)

## Output

Returns a token-compressed list of matching MCP servers or A2A tools relevant to the query, including capability metadata, endpoint URLs, and firewall-validated status. Results are compressed at ~85% to reduce token overhead for downstream agent consumption.

## 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-54e7d384/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)