# 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 meta-index of 500+ MCP servers and A2A tools by capability query, returning compressed, firewall-screened results for agent routing and tool discovery.

## 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-8548fb8b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XbINmXx8YdqtLzlScHO1N

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-8548fb8b
```

Example prompt: Search the MCP and A2A tool index for anything that can do 'SEC filings' or 'company enrichment' — I need to find the right tool to plug into my agent pipeline.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool to delegate a subtask to, especially when token budget is a concern (85% compression) or when you need prompt-injection safety screening on discovered tools. Prefer over manual tool registries when the tool landscape is large or unknown.

## Known failure modes

- Empty query string returns a validation error
- Query matches no indexed tools — empty result set returned
- Endpoint URL verification finds no matching index entry
- Firewall flags a result as potentially unsafe and filters it
- Service unavailable if the meta-router is under maintenance
- x402 payment failure if USDC balance is insufficient

## 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 compressed, prompt-injection-screened list of matching MCP servers or A2A tools from the 500+ tool index, including capability descriptors and routing metadata, with up to 85% token reduction compared to raw discovery responses.

## 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-8548fb8b/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)