# 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 json-repair.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 token-compressed results with prompt-injection firewall protection

## Facts

- Endpoint: GET https://json-repair.agentdiet.dev/v1/execute?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: json-repair.agentdiet.dev
- Website: https://json-repair.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/json-repair-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-b35c67b1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ihgOwsPZgDj2wBFzTlWfl

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 json-repair-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-b35c67b1
```

Example prompt: Search the MCP and A2A tool index for any servers or agents that handle 'SEC filings' — I want to find what's available so I can route my finance queries there.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover which MCP server or A2A tool can handle a given capability at runtime, rather than hardcoding tool routes. Especially useful for swarm orchestration, capability-gated routing, or when building meta-agents that need to select sub-agents programmatically. The 85% token compression makes it efficient for agents with tight context budgets, and the Prompt-Guard firewall adds safety for untrusted tool sources.

## Known failure modes

- Empty or too-broad query returns low-relevance results
- Endpoint URL verification may return false negatives for non-standard MCP implementations
- No matching tools found for niche or highly specific capability queries
- Rate limiting or payment failure (x402) if billing is not configured
- Upstream MCP server index may be stale for recently added servers

## 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://json-repair.agentdiet.dev/v1/execute)

## Output

Returns a token-compressed list of matching MCP servers or A2A tools relevant to the query, including capability descriptions, endpoint references, and verification status, all filtered through a Prompt-Guard firewall to block prompt-injection 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/json-repair-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-b35c67b1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from json-repair.agentdiet.dev](https://www.zero.xyz/host/json-repair.agentdiet.dev/llms.txt)