# 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 2026-10-23).

Searches and discovers MCP servers and A2A agent tools by capability query across a unified index of 500+ endpoints, with token compression and prompt-guard firewall.

## Facts

- Endpoint: GET https://json-repair.agentdiet.dev/v1/mesh?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- 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-10eba0bb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ulz50imXKHacmU23oky7b

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-10eba0bb
```

Example prompt: Search the MCP and A2A tool index for any available endpoints that handle 'SEC filings' — return up to 20 results so I can see what agent capabilities are out there.

## When to prefer this

Use this endpoint when an AI agent or swarm needs to dynamically discover which MCP servers or A2A tools support a given capability at runtime, rather than relying on a hardcoded list. Prefer it over manual directory lookups when you need token-compressed results and a prompt-guard firewall on returned tool descriptions.

## Known failure modes

- Empty query string returns a validation error requiring minLength of 1
- No matching tools found returns an empty results array
- Cursor invalid or expired returns a pagination error
- Rate limiting or payment failure (HTTP 402) blocks the request
- Upstream MCP server index unavailable returns a service error

## 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/mesh)

## Output

Returns a paginated list of matching MCP server or A2A tool entries with endpoint metadata such as capability descriptions, URLs, and relevance scores, plus an opaque cursor for fetching additional pages. The response is compressed for token efficiency.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "query"
 ],
 "properties": {
  "limit": {
   "type": "integer",
   "default": 20,
   "maximum": 100,
   "minimum": 1,
   "description": "Maximum number of items to return per page (1-100)"
  },
  "query": {
   "type": "string",
   "minLength": 1,
   "description": "Capability search query (e.g. 'context compression', 'github security', 'sec filings', 'company enrichment') or endpoint URL to verify"
  },
  "cursor": {
   "type": "string",
   "description": "Opaque pagination cursor for fetching the next page"
  }
 }
}
```

## 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-10eba0bb/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)