# 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 500+ indexed MCP servers and A2A tools by capability query and returns compressed, firewall-screened results via a single meta-router connection

## Facts

- Endpoint: GET https://preflight.agentdiet.dev/v1/workflows?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-94eaec87
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Zq46Pk4Vcv1ArPAWDZW2g

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-94eaec87
```

Example prompt: Search the MCP and A2A tool index for capabilities related to 'github security' — I want to find the best available tools across the 500+ indexed servers and get back compressed, firewall-safe results.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP servers or A2A tools are available for a given capability without hardcoding integrations. Ideal for swarm orchestration, agent bootstrapping, or when you want a single connection point that indexes 500+ servers with built-in safety filtering and token compression. Prefer it over manual MCP server lists when you need freshness, firewall protection, and compressed payloads.

## Known failure modes

- Empty query string returns validation error (query minLength:1 enforced)
- Query matches no indexed tools — returns empty results set
- Upstream MCP server index unavailable — service may return 503 or degraded results
- Firewall blocks a result due to suspected prompt injection in tool description
- Payment not fulfilled via x402 — returns HTTP 402 requiring USDC micropayment

## 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/workflows)

## Output

Returns a JSON object listing matched MCP servers and A2A tools relevant to the query, with tool descriptions compressed by up to 85% for token efficiency and filtered through a Prompt-Guard firewall to block prompt-injection payloads. May include endpoint URLs, capability summaries, and compliance metadata.

## 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-94eaec87/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)