# 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 workflows.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 agent tools, returning compressed capability matches with prompt-injection protection.

## Facts

- Endpoint: GET https://workflows.agentdiet.dev/v1/x402-gateway?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: workflows.agentdiet.dev
- Website: https://workflows.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/workflows-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-f3d387c2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pN1LlDAf2zMQkOD8xAvK-

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 workflows-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-f3d387c2
```

Example prompt: Search the MCP and A2A tool index for anything that can handle SEC filings or company financial enrichment — I need to know what's available and get a compressed summary I can act on.

## 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, rather than hardcoding tool URLs. It is especially useful in swarm or orchestration scenarios where the right downstream tool is unknown at build time, or when you need token-efficient tool descriptions and built-in prompt-injection filtering before routing to untrusted endpoints.

## Known failure modes

- Query string missing or empty — returns validation error
- No matching tools found for obscure or too-narrow queries — empty results set
- Endpoint URL verification fails if URL is not indexed — returns unverified or not-found status
- Rate limiting or payment failure at x402 gateway — returns 402 Payment Required
- Index may lag behind newly published MCP servers — stale results possible

## 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://workflows.agentdiet.dev/v1/x402-gateway)

## Output

Returns a structured object listing matched MCP servers and A2A tools relevant to the query, with compressed capability descriptions (up to 85% token reduction), prompt-injection safety flags, and endpoint metadata for verified URLs.

## 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/workflows-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-f3d387c2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from workflows.agentdiet.dev](https://www.zero.xyz/host/workflows.agentdiet.dev/llms.txt)