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

Searches an index of 500+ MCP servers and A2A tools by capability query, returning compressed tool descriptions routed through a Prompt-Guard firewall.

## Facts

- Endpoint: GET https://token-intel.agentdiet.dev/v1/agent-tool-marketplace?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: token-intel.agentdiet.dev
- Website: https://token-intel.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/token-intel-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-6aa7f4b0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Zd3Zw03QluJxOTzNDN4Xf

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 token-intel-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-6aa7f4b0
```

Example prompt: Search the agent tool marketplace for MCP servers that can do 'github security' audits — I want to see what's available and get compressed tool descriptions I can actually use.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover available MCP servers or A2A tools by capability at runtime, rather than hardcoding tool URLs. Particularly useful for swarm orchestration scenarios where the agent needs to find the right sub-tool for a given subtask, or when you want safe proxied access with built-in prompt-injection protection and token-compressed responses.

## Known failure modes

- Empty query string returns validation error
- No matching tools found for obscure or misspelled capability queries
- Endpoint URL verification may return not-found if URL is not indexed
- Token compression may lose nuance in very detailed tool descriptions
- Firewall may over-filter legitimate tool descriptions that resemble prompt injection patterns
- HTTP 402 payment required if x402 credits are exhausted

## 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://token-intel.agentdiet.dev/v1/agent-tool-marketplace)

## Output

Returns a filtered, token-compressed list of matching MCP servers and A2A tools from the 500+ indexed catalog, with tool descriptions passed through the Prompt-Guard firewall to remove prompt-injection risks. Results include tool metadata, capability summaries, and routing information.

## 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/token-intel-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-6aa7f4b0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from token-intel.agentdiet.dev](https://www.zero.xyz/host/token-intel.agentdiet.dev/llms.txt)