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

## Facts

- Endpoint: GET https://preflight.agentdiet.dev/v1/agent-router?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-2d552853
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RBKlJ4KQAMpJbFxTit5WT

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-2d552853
```

Example prompt: Search for MCP servers or A2A tools that can handle SEC filings and company enrichment — I want to find the right capability without browsing hundreds of servers manually.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover the right tool or MCP server for a capability without hardcoding integrations — especially valuable in swarm/multi-agent architectures where the agent fleet needs to route tasks to specialized tools. Prefer this over manually curating tool lists when the tool landscape changes frequently or when you need prompt-injection safety screening built into discovery.

## Known failure modes

- Empty query string returns validation error
- Query too vague returns low-confidence or empty results
- Endpoint URL verification returns unknown status if server is unreachable
- Rate limiting or payment failure returns 402 response requiring x402 USDC payment
- Firewall may flag and block results containing suspicious prompt-injection patterns

## 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/agent-router)

## Output

Returns a compressed, ranked list of matching MCP servers and A2A tools with metadata about their capabilities, schemas, and routing information, filtered through a prompt-injection firewall to ensure safety — delivered with up to 85% token compression compared to 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/preflight-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-2d552853/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)