# 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 mesh.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 and returns token-compressed, firewall-screened results for agent tool discovery and routing.

## Facts

- Endpoint: GET https://mesh.agentdiet.dev/v1/a2a-router?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: mesh.agentdiet.dev
- Website: https://mesh.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/mesh-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-c1968a06
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EgjmSAdRc_XSYf3UKCsZz

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 mesh-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-c1968a06
```

Example prompt: Search the MCP and A2A tool index for any servers or agents that handle 'SEC filings' — I need to find the best available tool for pulling structured financial data from EDGAR.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover, evaluate, or route to one of hundreds of MCP servers or A2A tools without maintaining its own index. It is especially useful for multi-agent swarm architectures, when you want a single connection point that handles tool search, safety filtering, and token-efficient responses. Prefer it over direct tool registries when prompt-injection protection and token compression are priorities.

## Known failure modes

- Empty query string returns validation error
- No matching tools found for obscure or highly specific queries
- Endpoint URL verification may return unknown if URL is not indexed
- Rate limit or payment failure (HTTP 402) if x402 USDC payment is not settled
- Firewall may block results if query contains 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://mesh.agentdiet.dev/v1/a2a-router)

## Output

Returns a list of matched MCP servers or A2A tools relevant to the query, with metadata about each tool's capabilities, compressed to reduce token usage by up to 85%, and screened by a Prompt-Guard firewall for safety before delivery.

## 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/mesh-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-c1968a06/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mesh.agentdiet.dev](https://www.zero.xyz/host/mesh.agentdiet.dev/llms.txt)