# 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 an index of 500+ MCP servers and A2A tools by capability query, returning compressed, firewall-filtered tool metadata via a single connection

## Facts

- Endpoint: GET https://mcp-security.agentdiet.dev/v1/workflows/defi-token-due-diligence?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-bb24748a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5x5UJGlMqpUGxMB9Asbe_

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-bb24748a
```

Example prompt: Search the MCP tool index for any servers that support 'company enrichment' and tell me which ones are available with their capabilities summarized.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP servers or A2A tools support a given capability without hard-coding individual tool URLs. Especially useful for swarm orchestration scenarios where the agent needs to route subtasks to the best available tool, or when you want to verify a third-party MCP endpoint for safety before connecting to it. Prefer this over manually maintaining a tool registry or connecting directly to untrusted MCP servers.

## Known failure modes

- Empty query string returns 400 validation error
- No matching tools found for obscure capability queries returns empty results
- Endpoint URL verification may fail if the remote server is offline
- Payment not completed (HTTP 402) blocks access
- Firewall may redact or block results containing suspicious prompt content

## 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/workflows/defi-token-due-diligence)

## Output

Returns a compressed, token-efficient listing of matching MCP servers or A2A tools from a 500+ item index, including tool names, capability descriptions, and endpoint metadata. If an endpoint URL is provided, returns verification and safety firewall status. Response is filtered through a Prompt-Guard firewall to block injected content.

## 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-bb24748a/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)