# 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 a curated index of 500+ MCP servers and A2A agent tools by capability query, returning compressed, firewall-filtered results via a single meta-router connection

## Facts

- Endpoint: GET https://mcp-compiler.agentdiet.dev/v1/tool-broker?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-f3c98f7e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HCwmbXHv682AICQiqvw3r

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-f3c98f7e
```

Example prompt: Search the MCP tool index for any servers that handle SEC filings or financial document extraction — I want to find the best available tool I can route to for that capability.

## 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 at runtime, especially when the agent does not have a hardcoded tool list and needs a single safe, compressed entry point across 500+ tools rather than maintaining individual connections to each.

## Known failure modes

- Missing or empty query parameter returns validation error
- No matching tools found for obscure or misspelled capability queries
- Prompt-Guard firewall may block queries containing injection-like patterns
- Upstream MCP servers may be temporarily unavailable, reducing index coverage
- x402 payment failure results in 402 response before results are 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/tool-broker)

## Output

A filtered, token-compressed list of matching MCP servers and A2A tool endpoints relevant to the query, passed through a Prompt-Guard firewall to remove unsafe or malicious content, with metadata about each discovered tool's capabilities.

## 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-f3c98f7e/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)