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

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

## Facts

- Endpoint: GET https://agentdiet.dev/v1/broker/catalog?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: agentdiet.dev
- Website: https://agentdiet.dev
- Canonical page: https://www.zero.xyz/c/agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-router-8b6bfa71
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_x2y8VeHFB56IuOVRzuvgN

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 agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-router-8b6bfa71
```

Example prompt: Search the agentdiet broker catalog for MCP servers or A2A tools that support SEC filings retrieval — I want to see what's available with token-compressed results and prompt firewall protection.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover available MCP servers or A2A tools by capability rather than hardcoding specific tool URLs. It is especially useful for multi-agent orchestration, swarm routing, or when building agents that need to self-discover the right sub-tool for a task. Prefer it over manual tool registries when token efficiency matters (85% compression) or when you need firewall-screened, safe tool references.

## Known failure modes

- Empty results if no tools match the query string
- 402 Payment Required if x402 payment header is missing or invalid
- Malformed query (missing or empty 'query' parameter) returns 400 error
- Prompt injection attempts blocked by Prompt-Guard firewall with rejection notice
- Timeout if the broker index is temporarily unavailable

## 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://agentdiet.dev/v1/broker/catalog)

## Output

A compressed catalog response listing matching MCP servers and A2A tools relevant to the query, including endpoint metadata, capability summaries, and Prompt-Guard firewall status. Results are delivered with up to 85% token compression to minimize agent context usage.

## 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/agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-router-8b6bfa71/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentdiet.dev](https://www.zero.xyz/host/agentdiet.dev/llms.txt)