# Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router — Security Audit DAG

> Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router — Security Audit DAG is a paid API for AI agents from mcp-compiler.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).

Searches and verifies MCP servers and A2A tools by capability query or endpoint URL, routing requests through a prompt-guard firewall with token compression.

## Facts

- Endpoint: GET https://mcp-compiler.agentdiet.dev/v1/security-audit-dag?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: mcp-compiler.agentdiet.dev
- Website: https://mcp-compiler.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/mcp-compiler-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-93cf1094
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XgL61oE9jtejV8t-V-V-P

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 mcp-compiler-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-93cf1094
```

Example prompt: Search the MCP tool index for any servers that handle 'github security audit' and tell me which ones pass the prompt-guard firewall check.

## When to prefer this

Choose this endpoint when you need to discover and vet MCP servers or A2A tools by capability without connecting to each one individually, or when you need to verify a specific endpoint URL against a prompt-injection firewall before trusting its output. Prefer it over direct MCP discovery when you want 85% token-compressed results and a safety layer bundled into a single call.

## Known failure modes

- Empty query string returns validation error (minLength:1 not met)
- No matching tools found for obscure capability queries
- Endpoint URL verification may time out if the target server is unreachable
- Payment failure (HTTP 402) if x402 payment header is missing or insufficient
- Firewall may flag legitimate endpoints as suspicious, causing false positives

## 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://mcp-compiler.agentdiet.dev/v1/security-audit-dag)

## Output

Returns a token-compressed index of matching MCP servers or A2A tools relevant to the query, along with security/firewall status for any verified endpoint URLs, capability metadata, and routing recommendations.

## 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/mcp-compiler-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-93cf1094/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcp-compiler.agentdiet.dev](https://www.zero.xyz/host/mcp-compiler.agentdiet.dev/llms.txt)