# 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 mcp-security.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 matching endpoints with token-compressed metadata via a Prompt-Guard firewall proxy.

## Facts

- Endpoint: GET https://mcp-security.agentdiet.dev/v1/broker/catalog?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: mcp-security.agentdiet.dev
- Website: https://mcp-security.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/mcp-security-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-27e269d1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9naxZp5MTi2KMmUM62XLh

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 mcp-security-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-27e269d1
```

Example prompt: Search the MCP broker catalog for tools that handle SEC filings and company enrichment — I want to see what's available so I can wire up an agent workflow.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover available MCP servers or A2A tools at runtime without maintaining its own tool registry, especially when token budget is constrained (85% compression) or when prompt-injection safety is a concern. Prefer it over manual tool lists when operating a multi-agent swarm that needs a single meta-router connection.

## Known failure modes

- Missing or empty query string returns a 400 validation error
- No matching tools found for an obscure query returns an empty results set
- Endpoint URL verification returns not-found if the URL is not indexed
- Payment not completed (HTTP 402) if x402 micropayment is not processed
- Firewall blocks a query flagged as a prompt injection attempt

## 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://mcp-security.agentdiet.dev/v1/broker/catalog)

## Output

A catalog response listing matching MCP servers and A2A tools for the queried capability, with 85% token-compressed metadata, safety-filtered through the Prompt-Guard firewall, including tool names, descriptions, and endpoint references.

## 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/mcp-security-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-27e269d1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcp-security.agentdiet.dev](https://www.zero.xyz/host/mcp-security.agentdiet.dev/llms.txt)