# 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 prompt-guard.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).

Searches and routes queries across 500+ indexed MCP servers and A2A tools through a single connection, with token compression and prompt injection firewall

## Facts

- Endpoint: GET https://prompt-guard.agentdiet.dev/v1/mesh/dispatch?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: prompt-guard.agentdiet.dev
- Website: https://prompt-guard.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/prompt-guard-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-eeb656d5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HpWuEOYyOiQsqiLwsfWa1

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 prompt-guard-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-eeb656d5
```

Example prompt: Search for an MCP tool that handles SEC filings or company enrichment — I need you to find and route through the best available capability across all indexed agent tools.

## When to prefer this

Use this endpoint when an agent needs to dynamically discover and route to one of hundreds of MCP or A2A tools without managing individual connections, especially when token budget is limited and prompt security (injection firewall) is a concern. Prefer over direct MCP server connections when the target tool is unknown or when a single safe proxy point is needed for a swarm of agents.

## Known failure modes

- No matching MCP server or A2A tool found for the query
- Query blocked by Prompt-Guard firewall due to injection attempt
- HTTP 402 payment required if payment not satisfied
- Timeout or upstream MCP server unavailability
- Malformed query returns validation error
- Token compression failure for unusually large responses

## 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://prompt-guard.agentdiet.dev/v1/mesh/dispatch)

## Output

A filtered, token-compressed response identifying matching MCP servers or A2A tools for the given capability query, routed through a prompt-injection firewall; returns tool metadata, matched endpoints, and proxied results from the best-fit service

## 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/prompt-guard-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-eeb656d5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from prompt-guard.agentdiet.dev](https://www.zero.xyz/host/prompt-guard.agentdiet.dev/llms.txt)