# 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 agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).

Searches a meta-index of 500+ MCP servers and A2A tools by capability query, returning compressed tool descriptions through a prompt-injection firewall.

## Facts

- Endpoint: GET https://agentdiet.dev/v1/web-rag-shield-dag?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: agentdiet.dev
- Website: https://agentdiet.dev
- Canonical page: https://www.zero.xyz/c/agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-router-72f07327
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eShjNj9WWv5kn32UNGpPf

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 agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-router-72f07327
```

Example prompt: Search the MCP and A2A tool index for servers that can handle 'SEC filings' and tell me which ones are available with their compressed capability summaries.

## When to prefer this

Choose this endpoint when you need to dynamically discover which MCP servers or A2A tools exist for a given capability without pre-knowing their URLs, or when you want a single safe proxy point that applies prompt-injection filtering before routing to external tools. Particularly useful in multi-agent swarm architectures where tool availability needs to be resolved at runtime. Prefer over manual tool registries when token budget is a constraint, as the 85% compression is a distinctive advantage.

## Known failure modes

- Query returns no matching tools if the capability term is too niche or misspelled
- Endpoint URL verification may return unverified/unsafe if the target is not indexed
- Generic or ambiguous queries may return a large unfiltered set
- Rate limiting or payment failure (x402) may block access
- Token compression artifacts may reduce fidelity of returned tool descriptions

## 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://agentdiet.dev/v1/web-rag-shield-dag)

## Output

Returns a compressed, firewall-filtered list of matching MCP servers or A2A tools from the 500+ tool index, including tool names, capability summaries (with ~85% token compression applied), and safety status from the Prompt-Guard firewall. May also return verification status if an endpoint URL was queried.

## 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/agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-router-72f07327/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentdiet.dev](https://www.zero.xyz/host/agentdiet.dev/llms.txt)