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

Searches and routes 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://mcp-compiler.agentdiet.dev/v1/a2a-router?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: mcp-compiler.agentdiet.dev
- Website: https://mcp-compiler.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/mcp-compiler-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-56b18496
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_x7pAmWz1r6LCWU95cl6LH

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 mcp-compiler-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-56b18496
```

Example prompt: Search across all indexed MCP servers and A2A tools to find something that can do SEC filings or company enrichment — I want to know which tools are available and how to reach them.

## When to prefer this

Use this endpoint when an agent needs to dynamically discover which MCP server or A2A tool is best suited for a given capability without maintaining its own registry or connecting to hundreds of individual servers. Ideal for orchestration layers, swarm routers, or any agent that needs to delegate subtasks to the most appropriate specialized tool. Prefer this over hardcoded tool registries or manual MCP server enumeration.

## Known failure modes

- Missing or empty query parameter returns validation error
- No matching tools found for obscure or overly specific capability queries
- Endpoint URL verification queries may time out if remote server is unreachable
- Prompt-Guard firewall may block queries containing injection-like patterns
- x402 payment failure if USDC balance insufficient
- Rate limiting under high-query swarm scenarios

## 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://mcp-compiler.agentdiet.dev/v1/a2a-router)

## Output

Returns a list of matching MCP servers or A2A tool endpoints relevant to the capability query, with compressed descriptions (up to 85% token reduction) and routing metadata. May include endpoint URLs, capability summaries, and safety-filtered results from the Prompt-Guard firewall.

## 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/mcp-compiler-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-56b18496/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcp-compiler.agentdiet.dev](https://www.zero.xyz/host/mcp-compiler.agentdiet.dev/llms.txt)