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

Searches and routes queries across 500+ indexed MCP servers and A2A tools with token-compressed results and prompt-injection firewall protection.

## Facts

- Endpoint: GET https://workflows.agentdiet.dev/paid?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: workflows.agentdiet.dev
- Website: https://workflows.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/workflows-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-1ca07403
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_IEfV6iODiDqlNgXArM4xv

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 workflows-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-1ca07403
```

Example prompt: Search the MCP tool index for any servers or A2A tools that handle SEC filings or company financial data enrichment, and give me the best-matching options with compressed metadata.

## When to prefer this

Choose this endpoint when your agent needs to dynamically discover which MCP servers or A2A tools exist for a given capability, rather than hardcoding tool URLs. Especially useful for swarm orchestration, building dynamic agent pipelines, or safely proxying through unknown external MCP endpoints with firewall protection. Prefer this over manual MCP server lists when you want 85% token compression on tool metadata to preserve context budget.

## Known failure modes

- Empty or too-broad query returns low-relevance results
- Endpoint URL verification returns not-found if the server is not indexed
- Malformed query string causes 400 bad request
- Payment not completed (HTTP 402) blocks access
- Rate limiting or timeout if index is under heavy load

## 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://workflows.agentdiet.dev/paid)

## Output

Returns a token-compressed listing of matching MCP servers and A2A tools ranked by relevance to the query, including tool names, capabilities, endpoint URLs, and firewall validation status. Results are filtered through a Prompt-Guard firewall to prevent injection risks.

## 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/workflows-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-1ca07403/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from workflows.agentdiet.dev](https://www.zero.xyz/host/workflows.agentdiet.dev/llms.txt)