# 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 a meta-index of 500+ MCP servers and A2A tools by capability query, returning token-compressed, firewall-screened results

## Facts

- Endpoint: GET https://mesh.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: 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-d293d5a2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7tz1tqLTWbK7oSdfEDYU2

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-d293d5a2
```

Example prompt: Search the MCP and A2A tool index for servers that can handle SEC filings retrieval — I need to find the best available tool for pulling structured SEC data.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover new tools or MCP servers at runtime rather than having them hardcoded. It is especially valuable in swarm or multi-agent architectures where agents must self-route to the right capability. Prefer it over static tool registries when you need firewall-protected, token-compressed results across 500+ indexed servers in a single call.

## Known failure modes

- Missing or empty query parameter returns a 400 validation error
- No matching tools found returns an empty result set
- Payment not settled via x402 results in a 402 Payment Required response
- Query too vague returns low-relevance or broad results
- Firewall blocks a result if the endpoint is flagged as containing prompt injection risks

## 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/tool-search)

## Output

Returns a compressed, firewall-screened list of matching MCP servers and A2A tools with metadata such as capability descriptions, endpoint URLs, and relevance scores, with up to 85% token reduction applied to the payload

## 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-d293d5a2/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)