# 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 2026-10-28).

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

## Facts

- Endpoint: POST https://workflows.agentdiet.dev/v1/broker/execute?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-28
- 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-c6961797
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DuHt3gsWZQImc4jqWYJQ4

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-c6961797 -d '<json body>'
```

Example prompt: Search across your indexed MCP servers and A2A tools to find me everything available for 'company enrichment' — I need results with token compression enabled and safe-proxied so no prompt injection gets through.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover which MCP server or A2A tool is best suited for a task at runtime, rather than hardcoding a specific tool. Especially useful when operating in multi-agent swarms where tool availability may vary, when prompt injection protection is required, or when token budget is constrained and 85% compression is needed. Prefer over manual tool registries when the landscape of available tools changes frequently.

## Known failure modes

- Empty query string returns a validation error (minLength:1 not met)
- No matching tools found for obscure or misspelled capability queries
- Prompt-Guard firewall may reject or sanitize queries containing injection-like patterns
- Upstream MCP server unavailability may result in partial or empty result sets
- Rate limiting or payment failure (x402) may block execution

## 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/execute)

## Output

Returns a filtered, token-compressed list of matching MCP servers and A2A tools relevant to the query, including metadata about each tool's capabilities, with responses passed through a Prompt-Guard firewall to strip injection attempts.

## 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-c6961797/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)