# 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 relevant endpoints with token-compressed results and prompt-injection firewall protection.

## Facts

- Endpoint: GET https://mcp-security.agentdiet.dev/v1/bundle-execute?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-deee57d5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lWHp7gXk6cz2_wB0BupLU

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-deee57d5
```

Example prompt: Search the MCP and A2A tool index for capabilities related to 'GitHub security audits' — I want to find available servers or tools I can add to my agent stack.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover and route to MCP servers or A2A tools at runtime without managing multiple separate connections. Especially useful when building agent swarms that need safe, token-efficient tool discovery with built-in prompt injection protection.

## Known failure modes

- Empty or too-broad query returns low-relevance results
- Query string missing required 'query' parameter returns 400 error
- No matching tools found in index for niche capability returns empty result set
- Payment not fulfilled (x402) results in 402 Payment Required response
- Prompt-Guard firewall blocks queries that appear adversarial or injection-like

## 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/bundle-execute)

## Output

A token-compressed list of matching MCP servers and A2A tools relevant to the capability query, with endpoint metadata, routing details, and safety-filtered output from the Prompt-Guard firewall layer.

## 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-deee57d5/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)