# 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 across 500+ indexed MCP servers and A2A tools by capability query, returning token-compressed, firewall-screened results through a single connection

## Facts

- Endpoint: GET https://mcp-compiler.agentdiet.dev/v1/workflows/execute?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-4ac744d3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_beRMAK7UzOu0Q_84epqu3

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-4ac744d3
```

Example prompt: Search the MCP tool index for servers that handle SEC filings or company enrichment, and give me the best matches with compressed descriptions.

## When to prefer this

Choose this endpoint when you need to discover which MCP server or A2A tool handles a specific capability without maintaining dozens of individual connections, or when you want token-compressed tool descriptions with built-in prompt injection firewall protection. Prefer it over manually curating a list of MCP endpoints, especially for agentic workflows that need dynamic tool routing across a large, heterogeneous tool ecosystem.

## Known failure modes

- No matching tools found for the query — returns empty result set
- Query too vague to disambiguate tool categories — returns mixed or low-confidence matches
- Upstream MCP server unavailable — proxy reports connectivity failure for that server
- Rate limit or payment failure via x402 — 402 Payment Required response
- Query string missing or empty — validation error returned

## 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/workflows/execute)

## Output

A compressed list of matching MCP servers or A2A tools relevant to the query, including endpoint metadata, capability summaries (with up to 85% token reduction), and Prompt-Guard firewall screening status, all accessible through a single proxied connection.

## 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-4ac744d3/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)