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

## Facts

- Endpoint: GET https://preflight.agentdiet.dev/v1/b2b-osint-dag?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-b0df37b5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3C0zCq6BbudSWUGEnBqU2

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-b0df37b5
```

Example prompt: Search the MCP and A2A tool index for capabilities related to 'SEC filings' — I want to find the best available tool or server that handles that, ideally with a compressed response to save tokens.

## When to prefer this

Choose this endpoint when you need to discover which MCP server or A2A tool is best suited for a given task without knowing the tool landscape in advance, or when you want a single proxied entry point with prompt-injection protection across 500+ tools. Prefer it over direct tool calls when operating in multi-agent swarms that need dynamic routing or when token budget is constrained and 85% compression is valuable.

## Known failure modes

- Empty or too-generic query returns low-confidence or empty results
- Unknown or malformed endpoint URL returns validation failure
- Rate limiting or payment failure (HTTP 402) if x402 payment not attached
- Query for a niche capability not indexed returns no matches
- Network timeout if the meta-router is aggregating many upstream sources

## 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/b2b-osint-dag)

## Output

Returns a list of matching MCP servers or A2A tools ranked by relevance to the query, along with capability metadata, endpoint URLs, and token-compressed summaries. If a URL is supplied, returns validation and safety assessment of that endpoint.

## 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-b0df37b5/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)