# 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 alpha-stream.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).

Searches and routes to 500+ indexed MCP servers and A2A agent tools via a single connection, with token compression and prompt injection protection.

## Facts

- Endpoint: GET https://alpha-stream.agentdiet.dev/v1/agent-router?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: alpha-stream.agentdiet.dev
- Website: https://alpha-stream.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/alpha-stream-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-6775a331
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TZNxGXZ_6RJH3Z6OW1pHw

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 alpha-stream-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-6775a331
```

Example prompt: Search the MCP and A2A tool index for anything that can do GitHub security auditing — I want to find the best available tool through a single safe connection with token compression.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover which MCP or A2A tool to call for a given capability, rather than hardcoding tool endpoints. Especially useful when building swarm agents that need to self-route across 500+ tools, when token budget is a concern (85% compression), or when you want prompt-injection protection via the Prompt-Guard firewall before delegating to a third-party tool.

## Known failure modes

- Empty query string returns validation error
- No matching tools found for obscure or misspelled capability queries
- Upstream MCP server unavailable or returning errors at proxy time
- Rate limiting or payment failure via x402 if quota exceeded
- Malformed endpoint URL when used in URL-verification mode

## 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://alpha-stream.agentdiet.dev/v1/agent-router)

## Output

Returns a list of matching MCP servers or A2A tools relevant to the query, with compressed metadata (up to 85% token reduction) describing each tool's capability, endpoint, and routing information. Results are filtered through a Prompt-Guard firewall to block injection risks.

## 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/alpha-stream-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-6775a331/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from alpha-stream.agentdiet.dev](https://www.zero.xyz/host/alpha-stream.agentdiet.dev/llms.txt)