# 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 2026-10-23).

Searches and routes queries across 500+ indexed MCP servers and A2A tools with token compression and prompt-injection firewall protection.

## Facts

- Endpoint: POST https://mcp-security.agentdiet.dev/v1/a2a-mesh?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- 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-afa34fa3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BuIvr9hIDQ3wrT9eoAuwY

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-afa34fa3 -d '<json body>'
```

Example prompt: Search the MCP tool index for servers that handle 'SEC filings' or 'company enrichment' and return the best matching endpoints with their capabilities compressed for my context window.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover or route to one of hundreds of MCP/A2A tools without maintaining its own index. Ideal when you want a single connection point that screens for prompt injection and compresses results for token efficiency, rather than hardcoding tool URLs or building your own discovery layer.

## Known failure modes

- Empty or vague query returns no useful matches
- Query too broad returns too many low-relevance results
- Endpoint URL verification fails if the target is offline
- Rate limiting or payment failure returns HTTP 402
- Prompt-Guard firewall may block queries that resemble injection attempts

## 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-mesh)

## Output

A list of matching MCP servers and A2A tool endpoints relevant to the search query, with compressed metadata (85% token reduction) and prompt-injection screening applied. Each result includes tool names, capabilities, and connection details.

## 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-afa34fa3/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)