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

Searches and routes across 500+ MCP servers and A2A tools via a single connection, with token compression and prompt injection firewall

## Facts

- Endpoint: POST https://github-audit.agentdiet.dev/v1/agent-tool-marketplace?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: github-audit.agentdiet.dev
- Website: https://github-audit.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/github-audit-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-383138b8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3iDcM1OvfiEC3n-HEuw6a

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 github-audit-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-383138b8 -d '<json body>'
```

Example prompt: Search the MCP and A2A tool marketplace for any servers or tools that support GitHub security auditing — I want to find something I can plug into my agent pipeline.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover, evaluate, or route to external MCP servers or A2A tools without managing dozens of individual connections. It is especially useful when building meta-agents or swarms that need safe, compressed access to a broad catalog of capabilities in a single call. Prefer this over hardcoded tool registries when the required capability is unknown at design time.

## Known failure modes

- Query string too vague returns low-relevance or empty results
- Endpoint URL verification fails if the target is offline or unreachable
- Rate limiting or payment failure (x402) if USDC balance is insufficient
- Token compression artifacts may truncate tool descriptions in some edge cases
- Prompt-Guard firewall may reject queries that resemble injection attempts

## 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://github-audit.agentdiet.dev/v1/agent-tool-marketplace)

## Output

Returns a list of matching MCP servers and A2A tools relevant to the query, with compressed metadata describing each tool's capabilities, plus firewall-verified safety status for any returned endpoints

## 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/github-audit-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-383138b8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from github-audit.agentdiet.dev](https://www.zero.xyz/host/github-audit.agentdiet.dev/llms.txt)