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

Searches and routes to 500+ indexed MCP servers and A2A tools via a single connection, with token-compressed results and a prompt-injection firewall

## Facts

- Endpoint: POST https://mcp-compiler.agentdiet.dev/v1/web-rag-shield-dag?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- 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-e3fc6960
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8tEwObqq36W0RXPqNTNIY

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-e3fc6960 -d '<json body>'
```

Example prompt: Search the MCP tool index for any servers that handle SEC filings or company enrichment — I need a single connection that routes me to the right tool with compressed output.

## When to prefer this

Choose this endpoint when an AI agent needs to discover or route to the right specialized tool from a large catalog of 500+ MCP and A2A services without maintaining multiple separate connections. It is especially valuable when token budget is a concern (85% compression), when prompt injection safety is needed (Prompt-Guard firewall), or when the agent doesn't know in advance which specific tool handles a capability and needs meta-discovery.

## Known failure modes

- No matching tools found for the query — empty result set returned
- Query too vague — returns overly broad results across many unrelated tools
- Endpoint URL provided for verification is unreachable or returns non-standard responses
- Token compression artifacts may reduce fidelity of tool descriptions for niche queries
- Payment authorization failure via x402 results in 402 response before search executes

## 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/web-rag-shield-dag)

## Output

Returns a ranked list of matching MCP servers or A2A tools from the 500+ index, with 85% token-compressed metadata describing each tool's capabilities, endpoint URLs, and routing information, filtered through a Prompt-Guard firewall to block malicious payloads.

## 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-e3fc6960/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)