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

Searches and routes across 500+ indexed MCP servers and A2A agent tools via a single connection, with token compression and a prompt-injection firewall

## Facts

- Endpoint: GET https://domain-osint.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: domain-osint.agentdiet.dev
- Website: https://domain-osint.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/domain-osint-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-84d2c0ed
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0kPsuLWHIPKP2bwQCJ0CC

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 domain-osint-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-84d2c0ed
```

Example prompt: Search your MCP tool index for anything that handles SEC filings or company enrichment — I want the top matches with compressed descriptions so I can pick one for my research agent.

## When to prefer this

Use this endpoint when you need to discover or route to the best tool across a large, heterogeneous ecosystem of 500+ MCP servers and A2A agents from a single connection, especially when token budget is limited (85% compression) or when prompt-injection safety is a concern. Prefer this over hardcoded tool lists or individual MCP server queries when the right tool is unknown upfront.

## Known failure modes

- Empty query string returns a validation error
- Query matches no indexed tools — returns empty result set
- Endpoint URL verification fails if target is unreachable or malformed
- Token compression may lose nuance for highly specialized queries
- Rate limiting or payment failure (x402) may block access
- Index may not reflect newly added or deprecated MCP servers in real time

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

## Output

Returns a list of matching MCP servers or A2A tools relevant to the query, with token-compressed descriptions (up to 85% compression) and routing metadata. May also return compliance or verification status if an endpoint URL is submitted for inspection.

## 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/domain-osint-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-84d2c0ed/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from domain-osint.agentdiet.dev](https://www.zero.xyz/host/domain-osint.agentdiet.dev/llms.txt)