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

Searches a catalog of 500+ MCP servers and A2A tools by capability query, returning token-compressed, firewall-screened results for agent tool discovery and routing.

## Facts

- Endpoint: GET https://preflight.agentdiet.dev/v1/broker/catalog?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: preflight.agentdiet.dev
- Website: https://preflight.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/preflight-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-dc2c5816
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zEQfg0T2yta4SZ1pY9FG5

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 preflight-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-dc2c5816
```

Example prompt: Search the MCP tool catalog for any servers or A2A agents that can handle 'SEC filings' — I need to find the best available capability for pulling public company financial documents.

## 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 at runtime, especially in swarm or multi-agent architectures where you want a single connection point to 500+ indexed tools with built-in safety filtering and token compression — rather than maintaining your own registry or hardcoding tool endpoints.

## Known failure modes

- Missing or empty 'query' parameter returns a validation error
- Query matches no tools in the catalog — returns empty results set
- Endpoint URL verification fails because the URL is not indexed
- Payment not attached (x402) — returns HTTP 402 requiring $0.01 USDC payment
- Catalog index temporarily stale or unavailable — may return partial results
- Prompt-Guard firewall blocks a query it flags as potentially injected

## 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://preflight.agentdiet.dev/v1/broker/catalog)

## Output

Returns a token-compressed, Prompt-Guard-firewall-screened list of matching MCP servers and A2A tools from an index of 500+ entries, including capability metadata, relevance scores, and safety status for each match.

## 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/preflight-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-dc2c5816/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from preflight.agentdiet.dev](https://www.zero.xyz/host/preflight.agentdiet.dev/llms.txt)