# 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 and discovers capabilities across 500+ indexed MCP servers and A2A tools, returning token-compressed results via a single meta-router endpoint with built-in Prompt-Guard firewall

## Facts

- Endpoint: GET https://mcp-security.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: 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-a8e41399
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mVAI6BXFikOBeK08lhPfc

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-a8e41399
```

Example prompt: Search the MCP meta-router for tools that handle 'company enrichment' — I need to find which indexed A2A servers support B2B lead data so I can wire one into my agent pipeline.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool to call for a given capability, rather than hardcoding tool endpoints. Especially valuable in multi-agent swarms where routing decisions must be made at runtime, or when you want a single connection point that also applies Prompt-Guard firewall filtering to discovered tools before forwarding.

## Known failure modes

- Empty query string returns validation error (query is required, minLength 1)
- No matching tools found for obscure or misspelled capability queries
- x402 payment failure if USDC balance insufficient ($0.01 per call)
- Rate limiting if swarm makes too many concurrent discovery calls
- Stale index results if a referenced MCP server has gone offline since indexing

## 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/a2a-router)

## Output

Returns a token-compressed list of matching MCP servers and A2A tool endpoints relevant to the query, including capability descriptions, endpoint URLs, and any Prompt-Guard security flags — compressed to roughly 85% fewer tokens than 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/mcp-security-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-a8e41399/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)