# 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 domain-osint.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-23).

Searches a meta-index of 500+ MCP servers and A2A tools by capability query, returning compressed, firewall-filtered tool discovery results through a single connection

## Facts

- Endpoint: POST https://domain-osint.agentdiet.dev/v1/workflows/execute?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: domain-osint.agentdiet.dev
- Website: https://domain-osint.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/domain-osint-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-950f9f3b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yY--jzI6EjBnmS2ccAfu5

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 domain-osint-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-950f9f3b -d '<json body>'
```

Example prompt: Search across all indexed MCP servers and A2A tools to find something that handles SEC filings or financial intelligence — I need the best match with the compressed tool description.

## 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 without hardcoding integrations — especially useful in swarm architectures where agents must self-select tools at runtime. Prefer it over manual MCP server lists when you need token-compressed results and built-in prompt-injection firewall protection across 500+ indexed tools in a single call.

## Known failure modes

- Empty or too-vague query returns no matches or low-relevance results
- Queried endpoint URL is unreachable or not indexed, returning no verification data
- Prompt-Guard firewall flags the query itself as potentially injected, blocking execution
- Payment failure (x402) if USDC balance is insufficient for the $0.01 per-call fee
- Rate limiting if the same Idempotency-Key is reused incorrectly across non-identical requests
- Malformed query (empty string or non-string) rejected by schema validation

## 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://domain-osint.agentdiet.dev/v1/workflows/execute)

## Output

A structured JSON response containing matched MCP servers or A2A tools relevant to the query, with token-compressed descriptions (up to 85% compression), prompt-injection firewall status, routing metadata, and relevance signals to help the agent select and connect to the right tool.

## 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/domain-osint-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-950f9f3b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from domain-osint.agentdiet.dev](https://www.zero.xyz/host/domain-osint.agentdiet.dev/llms.txt)