# 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 2026-10-23).

Searches and routes across 500+ indexed MCP servers and A2A tools via a single connection, with token compression and prompt injection protection

## Facts

- Endpoint: POST https://hn-pulse.agentdiet.dev/v1/mesh?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- 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-b73d5d75
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SwXb06Eturp67YRTk1e19

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-b73d5d75 -d '<json body>'
```

Example prompt: Search the mesh router for any MCP tools or A2A agents that support SEC filings or company enrichment — I need to find the right tool to plug into my agent pipeline.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover which MCP server or A2A tool is best suited for a specific capability at runtime, rather than hardcoding tool references. It is especially valuable for swarm architectures where tasks are delegated to specialized sub-agents and the right tool must be selected from a large catalog. Prefer it over manual tool registries when you need prompt-injection protection (Prompt-Guard firewall) and want 85% token compression on results to stay within context limits.

## Known failure modes

- Empty query string returns validation error (minLength:1 required)
- No matching tools found for obscure or very narrow capability queries
- Prompt-Guard firewall may reject queries that resemble injection attempts
- Endpoint URL verification may return unverified if URL is not indexed
- Rate limiting or payment failure via x402 if USDC balance is insufficient
- Timeout if the meta-router is querying many upstream MCP servers simultaneously

## 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/mesh)

## Output

Returns a list of matching MCP servers or A2A tools from the 500+ indexed catalog, with capability metadata, relevance to the query, and token-compressed summaries, filtered through the Prompt-Guard firewall to prevent 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-b73d5d75/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)