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

Searches an index of 500+ MCP servers and A2A tools by capability query, returning token-compressed, prompt-injection-guarded results for agent tool discovery and routing

## Facts

- Endpoint: GET https://mesh.agentdiet.dev/v1/web-rag-shield-dag?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: mesh.agentdiet.dev
- Website: https://mesh.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/mesh-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-6e7b30eb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tsVKQ_etG_vuh55Qc71Yi

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 mesh-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-6e7b30eb
```

Example prompt: Search the MCP tool index for servers that handle 'context compression' and tell me which ones are available with their endpoints and capability summaries.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover which MCP servers or A2A tools exist for a given capability without hardcoding tool URLs; especially valuable in swarm architectures where the right downstream tool is not known in advance, or when you want a prompt-injection-guarded proxy layer before calling untrusted MCP endpoints.

## Known failure modes

- Query string is empty or too vague, returning no relevant matches
- Queried capability not represented in the 500+ server index, returning empty results
- Payment not processed (HTTP 402) if x402 micropayment fails
- Rate limiting if the endpoint is called too frequently
- URL verification returns inconclusive safety verdict for unindexed endpoints

## 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://mesh.agentdiet.dev/v1/web-rag-shield-dag)

## Output

A token-compressed (up to 85% reduction) list of matching MCP servers or A2A tools with their capability descriptions, endpoint URLs, and safety/prompt-injection verdicts, filtered by the capability query provided.

## 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/mesh-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-6e7b30eb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mesh.agentdiet.dev](https://www.zero.xyz/host/mesh.agentdiet.dev/llms.txt)