# 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 queries across 500+ indexed 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/broker/execute?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-2fc4d178
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lK_AACk3Yvor0CNQuBiI8

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-2fc4d178
```

Example prompt: Search the MCP and A2A tool index for anything that handles SEC filings or company enrichment — I need to find the best available tool to route that capability through.

## When to prefer this

Choose this endpoint when an agent needs to discover, validate, or route to any of 500+ MCP or A2A tools through a single connection rather than maintaining separate integrations. Ideal for agent orchestration layers, swarm routers, or any system that dynamically selects tools at runtime. Prefer over direct tool connections when prompt-injection firewall protection and token compression are required.

## Known failure modes

- Empty or overly broad query returns too many or irrelevant results
- Query for a niche capability returns no matches if not yet indexed
- Endpoint URL verification may return false negatives for newly registered endpoints
- Token compression artifacts may alter tool manifest semantics
- Payment failure via x402 prevents execution

## 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/execute)

## Output

Returns matched MCP servers and A2A tools relevant to the query, including endpoint metadata, compressed tool manifests (85% token reduction), and safety validation status from the Prompt-Guard firewall. Response schema is a generic object containing ranked tool results.

## 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-2fc4d178/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)