# 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 and verifies 500+ MCP servers and A2A tools via a single meta-router endpoint with token-compressed results and prompt-injection firewall protection

## Facts

- Endpoint: GET https://mesh.agentdiet.dev/api/mcp/audit?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-1fc6bd19
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_U3yobLNIjXFb3xWvjEPp-

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-1fc6bd19
```

Example prompt: Search the MCP tool registry for any servers or A2A agents that handle SEC filings and company enrichment — I want to know what's available before I wire things up.

## When to prefer this

Choose this endpoint when an AI agent needs to discover, compare, or verify MCP servers and A2A tools across a large index (500+) in a single call, especially when token budget is constrained (85% compression) or when safety screening against prompt-injection attacks is required before routing agent traffic.

## Known failure modes

- Empty query string returns a validation error
- No matching tools found returns empty results set
- Unrecognized or malformed endpoint URL for verification may return null safety status
- Rate limiting or payment failure (x402) returns 402 Payment Required
- Upstream MCP index unavailability may cause partial or degraded 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://mesh.agentdiet.dev/api/mcp/audit)

## Output

Returns a token-compressed list of matching MCP servers and A2A tools relevant to the query, including capability descriptions, endpoint metadata, and safety verification status from the Prompt-Guard firewall. Results are pruned for low token footprint (~85% compression vs raw listings).

## 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-1fc6bd19/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)