# 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).

Meta-router that indexes 500+ MCP servers and A2A tools, letting agents discover and proxy-call external capabilities through a single connection with token compression and prompt firewall.

## Facts

- Endpoint: POST https://github-audit.agentdiet.dev/v1/mesh?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-d5e9d215
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yO9IZ-584NDdLdWddnr31

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-d5e9d215 -d '<json body>'
```

Example prompt: Search the MCP mesh for tools that can do GitHub security auditing — I need to find and route through whatever servers handle that capability.

## When to prefer this

Choose this endpoint when an agent needs to discover which MCP servers or A2A tools exist for a given capability without maintaining separate connections to hundreds of services. Ideal for swarm orchestration, dynamic tool selection, or when token budget is tight and 85% compression matters. Prefer over direct MCP connections when safety filtering (Prompt-Guard) is required.

## Known failure modes

- No matching tools found for the given query — returns empty results
- Query string too vague — low-quality matches returned
- Proxied MCP server unavailable — upstream timeout or connection error
- Payment not received or insufficient — HTTP 402 returned
- Prompt-Guard firewall blocks a malicious or suspicious tool response

## 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/mesh)

## Output

Returns a list of matching MCP servers or A2A tools from a 500+ entry index, including capability descriptions, endpoint URLs, and routing metadata, with responses compressed by up to 85% to reduce token usage. Also includes Prompt-Guard firewall screening on returned tool outputs.

## 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-d5e9d215/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)