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

Searches and discovers capabilities across 500+ MCP servers and A2A tools via a single meta-router endpoint with token compression and prompt-injection firewall

## Facts

- Endpoint: GET https://mesh.agentdiet.dev/v1/web-rag-shield-dag?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: mesh.agentdiet.dev
- Website: https://mesh.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/mesh-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-e42ef5a0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9DBAwazgNokZxTGtHaZFe

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 mesh-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-e42ef5a0
```

Example prompt: Search the MCP and A2A tool registry for capabilities related to 'github security auditing' — I want to find the best available tool I can call from my agent.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover the right tool or MCP server for a capability at runtime rather than hardcoding a specific tool. Ideal for swarm architectures, meta-agents, or orchestrators that must route tasks to appropriate sub-agents. Also use it to validate untrusted MCP endpoint URLs before proxying through them.

## Known failure modes

- Empty or too-broad query returns irrelevant or overwhelming results
- Unknown or niche capability not indexed across the 500+ servers returns no matches
- Endpoint URL verification fails if the target URL is unreachable or returns non-standard responses
- Payment failure (HTTP 402) if x402 micropayment is not properly initialized
- Rate limiting if too many queries are issued in rapid succession

## 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://mesh.agentdiet.dev/v1/web-rag-shield-dag)

## Output

Returns a token-compressed list of matching MCP servers, A2A tools, or endpoint metadata relevant to the query, filtered through a Prompt-Guard firewall to remove malicious or injection-prone results. Includes tool names, capability descriptions, and routing information.

## 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/mesh-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-e42ef5a0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mesh.agentdiet.dev](https://www.zero.xyz/host/mesh.agentdiet.dev/llms.txt)