# 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 and routes across 500+ indexed MCP servers and A2A tools using a single connection with token compression and prompt-injection firewall

## Facts

- Endpoint: GET https://hn-pulse.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: 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-71dab4a8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3v_G2b5WLPv62GVXzCaRS

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-71dab4a8
```

Example prompt: Search the tool broker for MCP servers or A2A tools that handle SEC filings and company enrichment — I want to find available capabilities in a single call.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover which MCP servers or A2A tools are available for a given capability without hardcoding individual endpoint URLs. It is especially useful when building swarm orchestrators, multi-agent pipelines, or capability routing layers that need to stay current with a large and changing tool ecosystem without blowing token budgets.

## Known failure modes

- Missing or empty 'query' parameter returns a 400 validation error
- No matching tools found for an obscure or misspelled capability query returns an empty result set
- Rate limiting or payment failure via x402 returns a 402 Payment Required response
- Upstream MCP server index unavailable may return degraded or stale results
- Overly broad queries may return too many low-relevance tools

## 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-broker)

## Output

Returns a list of matching MCP servers or A2A tools relevant to the search query, with compressed metadata (up to 85% token reduction) describing each tool's capabilities, endpoint URLs, and schema details, filtered through a Prompt-Guard firewall to prevent prompt-injection attacks.

## 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-71dab4a8/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)