# 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 2026-10-21).

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

## Facts

- Endpoint: GET https://github-audit.agentdiet.dev/v1/a2a-mesh?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- 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-29034845
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KT2afLLIhDWT3FB8yAnkT

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-29034845
```

Example prompt: Search the A2A and MCP tool index for any servers that can do GitHub security auditing — I want to find available tools through the agentdiet meta-router.

## When to prefer this

Choose this endpoint when you need to discover which of 500+ MCP servers or A2A tools can handle a given capability, rather than calling a specific known API. Ideal for dynamic agent swarms that need to self-route to the right tool at runtime, or when you want a single-connection proxy to many backend tools with built-in prompt injection protection and token-compressed responses.

## Known failure modes

- Missing or empty 'query' parameter returns a validation error
- Query matches no indexed tools — empty results returned
- Firewall blocks a result flagged as unsafe — filtered from output
- Endpoint unreachable or payment not processed — 402 Payment Required
- Upstream MCP server index temporarily unavailable — degraded results or error

## 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/a2a-mesh)

## Output

Returns a compressed (up to 85% token reduction) list of matching MCP servers and A2A tools relevant to the capability query, including endpoint metadata, filtered through a Prompt-Guard firewall to block malicious content. Response schema is a generic object containing matched tool listings and routing information.

## 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-29034845/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)