# 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 mcp-security.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 matching endpoints with token-compressed results and prompt-firewall protection.

## Facts

- Endpoint: GET https://mcp-security.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: mcp-security.agentdiet.dev
- Website: https://mcp-security.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/mcp-security-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-9c432f71
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dqG94FU4ifAObUKeSLKWp

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 mcp-security-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-9c432f71
```

Example prompt: Search your index of MCP servers and A2A tools for anything that can do SEC filings analysis — I need to find the right capability to route my agent to.

## When to prefer this

Choose this endpoint when you need to dynamically discover which MCP server or A2A tool can handle a given capability at runtime, rather than hardcoding a specific tool. Ideal for swarm architectures, meta-agents, or orchestrators that need to route subtasks to the best available tool. Particularly valuable when you don't know in advance which specialized endpoint handles a domain like SEC filings, token intelligence, or GitHub auditing.

## Known failure modes

- Empty query string returns validation error
- No matching tools found for obscure or highly specific capability queries
- Payment required (HTTP 402) if x402 balance is insufficient
- Prompt-Guard firewall may block queries that appear adversarial or injection-like
- Upstream MCP server index may be stale for newly added 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://mcp-security.agentdiet.dev/v1/tool-search)

## Output

A token-compressed list of matching MCP servers and A2A tools relevant to the capability query, including endpoint metadata, descriptions, and routing information, filtered through a 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/mcp-security-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-9c432f71/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcp-security.agentdiet.dev](https://www.zero.xyz/host/mcp-security.agentdiet.dev/llms.txt)