# 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 a catalog of 500+ MCP servers and A2A agent tools by capability query, returning token-compressed matches routed through a Prompt-Guard firewall

## Facts

- Endpoint: GET https://workflows.agentdiet.dev/v1/broker/catalog?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-b56e9fc2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eSd2TKK63nrqXgwl5pTbB

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-b56e9fc2
```

Example prompt: Search the MCP and A2A tool catalog for any server that handles SEC filings or financial document retrieval — I need to know what's available before wiring it into my agent workflow.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP servers or A2A tools are available for a given capability at runtime, especially in swarm or orchestration contexts where a single meta-router connection is preferred over managing 500+ individual integrations. Ideal when token efficiency matters (85% compression) or when routing untrusted tool calls through a firewall is required.

## Known failure modes

- Missing required 'query' parameter returns a 400 validation error
- Query with no matching tools returns an empty result set
- Payment not supplied triggers an HTTP 402 response requiring x402 Base USDC payment
- Query string too short (minLength 1 not met) causes schema validation failure
- Downstream MCP server unavailability may result in partial or stale catalog results

## 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/v1/broker/catalog)

## Output

A token-compressed catalog response listing matching MCP servers or A2A tools relevant to the query, including endpoint metadata, capability descriptions, and routing information, delivered through a Prompt-Guard firewall for safety.

## 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-b56e9fc2/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)