# 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 catalog of 500+ MCP servers and A2A tools by capability query, returning compressed, firewall-filtered endpoint metadata via a single connection.

## Facts

- Endpoint: GET https://json-repair.agentdiet.dev/v1/broker/catalog?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-7f09d202
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nGqwiEbLB7Fso-SNl49rd

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-7f09d202
```

Example prompt: Search the A2A and MCP tool catalog for anything related to 'SEC filings' — I want to see what agent tools are available for that capability.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP servers or A2A tools are available for a given capability, rather than hard-coding tool endpoints. Especially useful for swarm orchestrators, meta-agents, and agent pipelines that need to select the right downstream tool at runtime. Prefer this over static tool registries when you need prompt-injection firewall filtering and token-compressed responses optimized for LLM consumption.

## Known failure modes

- Empty query string returns validation error
- No matching tools found for niche or misspelled query returns empty result set
- Invalid endpoint URL format when used for verification may return an error
- Rate limiting or payment failure (HTTP 402) if payment not provided
- Catalog may not reflect newly added MCP servers if index is stale

## 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/broker/catalog)

## Output

Returns a catalog listing of matching MCP servers and A2A tools filtered by the capability query, including compressed tool descriptors with endpoint metadata, capability tags, and Prompt-Guard firewall status. The response is token-compressed by approximately 85% for efficient agent consumption.

## 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-7f09d202/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)