# 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 a meta-index of 500+ MCP servers and A2A tools by capability query, returning compressed, firewall-screened endpoint matches via a single connection.

## Facts

- Endpoint: GET https://mcp-security.agentdiet.dev/v1/a2a-mesh?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-e345c311
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cdQC8qzL3IhmR30QPfZwv

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-e345c311
```

Example prompt: Search the A2A and MCP tool mesh for any indexed servers that can handle SEC filings or company enrichment — I need the best matching endpoint with token-compressed results and prompt firewall screening.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover the right MCP server or A2A tool from a large registry without pre-configuring individual connections, especially when token budget is constrained (85% compression) or when prompt injection safety screening is required before routing to third-party tools.

## Known failure modes

- Missing or empty query parameter returns 400 validation error
- No matching tools found for an obscure capability query returns empty results
- Payment not completed (HTTP 402) blocks access if x402 micropayment is not attached
- Endpoint URL verification query returns no match if the URL is not indexed
- Rate limiting or upstream MCP server unreachability may cause partial results

## 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

Returns a compressed, Prompt-Guard-screened list of matching MCP server or A2A tool descriptors from a 500+ server index, including endpoint URLs, capability summaries, and compliance signals — with up to 85% token reduction versus 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-e345c311/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)