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

Searches a meta-index of 500+ MCP servers and A2A tools by capability query, returning compressed, firewall-filtered results via a single endpoint.

## Facts

- Endpoint: GET https://hn-pulse.agentdiet.dev/v1/tool-search?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: hn-pulse.agentdiet.dev
- Website: https://hn-pulse.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/hn-pulse-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-d50788cd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Y8Pl5qAI0JwhA8xK7b0Me

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 hn-pulse-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-d50788cd
```

Example prompt: Search the MCP tool index for any servers that handle 'SEC filings' or 'company enrichment' — I need to find the best available tool for that capability across the swarm.

## When to prefer this

Use this endpoint when an AI agent needs to dynamically discover which MCP servers or A2A tools are available for a given capability, rather than hardcoding tool endpoints. Ideal for swarm orchestration scenarios where the agent must route tasks to the best available tool without prior knowledge of the full tool landscape. Prefer this over manual tool catalogs when you need token-efficient, firewall-safe tool discovery across a large, heterogeneous index.

## Known failure modes

- Query too vague — returns no matching tools or overly broad results
- Endpoint URL provided for verification does not exist in the index — returns empty or not-found response
- Rate limit exceeded or payment not processed — HTTP 402 response
- Swarm index temporarily unavailable — service timeout or 503 error
- Query triggers prompt-injection filter — request blocked by Prompt-Guard firewall

## 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://hn-pulse.agentdiet.dev/v1/tool-search)

## Output

A compressed list of matching MCP servers or A2A tools relevant to the search query, including tool metadata and capability descriptions filtered through the Prompt-Guard firewall, with up to 85% token reduction.

## 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/hn-pulse-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-d50788cd/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from hn-pulse.agentdiet.dev](https://www.zero.xyz/host/hn-pulse.agentdiet.dev/llms.txt)