# 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 discovers capabilities across 500+ MCP servers and A2A tools via a single meta-router endpoint with prompt-guard filtering and token compression

## Facts

- Endpoint: GET https://hn-pulse.agentdiet.dev/v1/a2a-mesh?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-d7bdb929
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6TbHhQEWzAdx3zewqDtAM

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-d7bdb929
```

Example prompt: Search across all indexed MCP servers and A2A tools to find anything that can do SEC filings retrieval — give me the best matching tools with their descriptions compressed.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP servers or A2A tools support a given capability without manually enumerating hundreds of registries. It is especially useful for multi-agent orchestration, swarm routing, and when token budget is constrained (85% compression). Prefer it over manually querying individual MCP registries or maintaining a static tool list.

## Known failure modes

- No tools found for an obscure or overly narrow query — returns empty result set
- Query string too short or vague — may return irrelevant broad matches
- Endpoint URL verification fails if the remote endpoint is offline or non-standard
- Rate limiting or payment failure (x402) if per-call credits are exhausted
- Prompt-Guard firewall may reject queries that appear adversarial or contain injection patterns

## 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/a2a-mesh)

## Output

A compressed, filtered list of matching MCP server tools and A2A agent endpoints relevant to the query, including capability descriptions, endpoint URLs, and compliance/availability metadata — delivered with up to 85% token compression via Prompt-Guard firewall filtering.

## 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-d7bdb929/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)