# 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 shopify-spy.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 compressed, firewall-screened results via a single meta-router connection

## Facts

- Endpoint: GET https://shopify-spy.agentdiet.dev/v1/a2a-mesh?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: shopify-spy.agentdiet.dev
- Website: https://shopify-spy.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/shopify-spy-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-d094c3c0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BsvlpT2xdvtaDv4kAwO7A

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 shopify-spy-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-d094c3c0
```

Example prompt: Search the A2A mesh for MCP servers that can do GitHub security audits and return the best matching tools with their capabilities compressed.

## When to prefer this

Choose this endpoint when you need to discover which MCP servers or A2A tools exist for a given capability without knowing specific endpoint URLs in advance. It is especially useful when building multi-agent swarms that need dynamic tool routing, or when you want firewall-screened, token-compressed results rather than raw tool manifests. Prefer it over manual tool registries when querying across 500+ tools simultaneously.

## Known failure modes

- Empty query string returns 400 validation error
- No matching tools found for obscure capability queries returns empty result set
- Prompt-Guard firewall blocks queries flagged as adversarial or injection attempts
- Upstream MCP server index may be stale if recently added servers haven't been indexed
- x402 payment failure results in 402 response before query is processed
- Highly ambiguous queries may return low-relevance tool matches

## 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://shopify-spy.agentdiet.dev/v1/a2a-mesh)

## Output

A compressed index of matching MCP servers and A2A tools ranked by relevance to the query, including capability descriptions, endpoint URLs, and metadata — filtered through a Prompt-Guard firewall to remove malicious or non-compliant results. Token usage is reduced by approximately 85% versus raw tool manifests.

## 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/shopify-spy-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-d094c3c0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from shopify-spy.agentdiet.dev](https://www.zero.xyz/host/shopify-spy.agentdiet.dev/llms.txt)