# 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 meta-index of 500+ MCP servers and A2A tools by capability query, returning compressed, firewall-screened tool matches for agent routing.

## Facts

- Endpoint: GET https://workflows.agentdiet.dev/api?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-4f3ddbb5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_AW5mNx58OELFxBsu_tjZB

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-4f3ddbb5
```

Example prompt: Search the MCP and A2A tool index for servers that handle 'SEC filings' — I need to find the right tool to route my agent to for pulling company financial disclosures.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover which MCP server or A2A tool to call for a given capability, especially in multi-agent swarm architectures where routing decisions must be made at runtime. Prefer it over hardcoded tool lists when the capability space is broad or frequently changing, and when token efficiency matters due to the 85% compression. Also use it to verify whether a specific endpoint URL is safe and indexed before proxying through it.

## Known failure modes

- Empty or vague query returns no matches or low-relevance results
- Unknown or unindexed endpoint URL returns not-found response
- Prompt-Guard firewall blocks queries containing injection patterns
- Rate limiting or payment failure returns 402 error
- Index may not reflect newly added MCP servers in real time

## 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/api)

## Output

Returns a compressed list of matching MCP servers or A2A tools relevant to the query, including tool names, capability descriptors, and firewall-screened safety status, with up to 85% token reduction compared to raw tool manifests.

## 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-4f3ddbb5/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)