# 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 llms-generator.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-28).

Searches and routes across 500+ indexed MCP servers and A2A tools, returning compressed capability matches with prompt-injection firewall protection.

## Facts

- Endpoint: POST https://llms-generator.agentdiet.dev/v1/agent-tool-marketplace?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Provider: llms-generator.agentdiet.dev
- Website: https://llms-generator.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/llms-generator-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-2f34c8f2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KvPhrdbCE02acjT4w2e3w

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 llms-generator-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-2f34c8f2 -d '<json body>'
```

Example prompt: Search the agent tool marketplace for MCP servers and A2A tools that can do context compression — I need to find what's available and get a summary of the best matches.

## When to prefer this

Choose this endpoint when you need to discover which MCP servers or A2A tools exist for a given capability before committing to a specific tool — especially when building multi-agent swarms, comparing tool options, or verifying whether a particular endpoint URL is indexed. Prefer this over direct tool calls when the right tool is unknown and discovery is the first step. The built-in Prompt-Guard firewall makes it safer than raw proxy approaches.

## Known failure modes

- Empty or vague query string returns no useful matches
- Query for a niche capability not indexed among the 500+ servers returns empty results
- Payment required (HTTP 402) if x402 credentials are missing or invalid
- Prompt-Guard firewall blocks queries that contain injection-like patterns
- Malformed query (too short) rejected by minLength:1 schema validation

## 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://llms-generator.agentdiet.dev/v1/agent-tool-marketplace)

## Output

Returns a compressed, token-pruned list of matching MCP servers and A2A tools relevant to the query, including capability descriptions and routing metadata, filtered through a Prompt-Guard firewall to prevent injection attacks. Response uses 85% token compression.

## 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/llms-generator-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-2f34c8f2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from llms-generator.agentdiet.dev](https://www.zero.xyz/host/llms-generator.agentdiet.dev/llms.txt)