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

Searches and discovers capabilities across 500+ MCP servers and A2A tools via a single meta-router endpoint with prompt-injection firewall and 85% token compression.

## Facts

- Endpoint: GET https://mesh.agentdiet.dev/v1/b2b-osint-dag?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: mesh.agentdiet.dev
- Website: https://mesh.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/mesh-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-28592785
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fdDEDIWckwCWgc4LIRYxM

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 mesh-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-28592785
```

Example prompt: Search the MCP and A2A tool index for capabilities related to 'company enrichment' — I want to find which tools or servers can help me enrich B2B lead data.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover MCP servers or A2A tools at runtime rather than hardcoding tool lists. Especially useful for swarm orchestration, capability-based routing, or when building agents that need to self-assemble toolchains from a large index. Preferred over manual tool catalogs when you need 85% token compression on capability metadata and built-in prompt-injection safety.

## Known failure modes

- Empty results if query terms are too vague or no indexed tools match
- Rate limit or payment failure if x402 micropayment is not correctly handled
- Prompt-Guard firewall may block or flag queries containing suspicious injection patterns
- Timeout if the meta-router index is slow to respond
- Malformed query (missing required 'query' field) returns validation 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://mesh.agentdiet.dev/v1/b2b-osint-dag)

## Output

Returns a token-compressed list of matching MCP servers and A2A tools relevant to the query, including capability metadata, endpoint URLs, and routing information, filtered through a Prompt-Guard firewall to prevent injection attacks.

## 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/mesh-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-28592785/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mesh.agentdiet.dev](https://www.zero.xyz/host/mesh.agentdiet.dev/llms.txt)