# 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 an index of 500+ MCP servers and A2A tools by capability query, returning compressed, firewall-filtered results for agent routing

## Facts

- Endpoint: GET https://workflows.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: 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-94483294
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VCek1Mvz0Fr5jrwsBizDa

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-94483294
```

Example prompt: Search the AgentDiet tool index for any MCP servers or A2A tools that can handle SEC filings and company enrichment, and return the top matches with compressed metadata.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover which MCP servers or A2A tools are available for a given capability without hard-coding individual integrations. It is especially valuable for swarm architectures, meta-agents, or orchestrators that need a single connection to route across 500+ tools, and when token efficiency matters due to the 85% compression guarantee. Prefer this over manual tool registries or raw MCP server lists when you also need built-in Prompt-Guard firewall filtering on results.

## Known failure modes

- Empty or too-vague query returns no useful matches
- Query too narrow returns zero results from the index
- Endpoint URL verification returns unrecognized or unlisted result
- Rate limiting or payment failure (x402) blocks response
- Index may not reflect the most recently added MCP servers if not yet crawled

## 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/tool-search)

## Output

Returns a compressed, Prompt-Guard-filtered list of matching MCP servers and A2A tool entries from a 500+ tool index, including capability metadata and routing information, with up to 85% token compression applied to reduce context overhead for agents.

## 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-94483294/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)