# 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).

Discovers and routes to 500+ MCP servers and A2A tools via a single meta-router endpoint with token compression and prompt-injection firewall.

## Facts

- Endpoint: GET https://mcp-security.agentdiet.dev/v1/security-audit-dag?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-69e77b38
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cVqiWk62M8oCcBI1yNeSR

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-69e77b38
```

Example prompt: Can you search the MCP tool index for anything that handles SEC filings or financial data enrichment, and tell me which endpoints are safe to use?

## 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 a specific tool. It is especially valuable when building swarm architectures, when the required tool is unknown at design time, or when you need to verify the safety of an external MCP endpoint before calling it.

## Known failure modes

- Empty or vague query returns no useful matches
- Unknown or unindexed endpoint URL cannot be verified
- Prompt-Guard firewall may flag and block suspicious queries
- Rate limiting or payment failure (x402) if quota exceeded
- Stale index data if newly launched MCP servers are not yet indexed

## 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/security-audit-dag)

## Output

Returns a ranked list of matching MCP servers and A2A tools for the given capability query, including endpoint metadata, security flags from the Prompt-Guard firewall, and routing recommendations — all compressed to minimize token usage.

## 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-69e77b38/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)