# 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 mcp-compiler.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 matching endpoints with token-compressed metadata through a Prompt-Guard firewall.

## Facts

- Endpoint: GET https://mcp-compiler.agentdiet.dev/v1/mesh/dispatch?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: mcp-compiler.agentdiet.dev
- Website: https://mcp-compiler.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/mcp-compiler-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-7ca07934
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_V92_5shQj5jja4pvClzqJ

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 mcp-compiler-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-7ca07934
```

Example prompt: Search the MCP mesh index for tools that can do SEC filings retrieval — I want to find available servers and see their compressed capability summaries.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover and route to the right MCP server or A2A tool at runtime rather than hard-coding a specific tool. It is especially useful when building swarm architectures, when the right tool is unknown ahead of time, or when token budget is a concern (85% compression). Prefer it over manual tool registries when safety from prompt injection via upstream tools is required.

## Known failure modes

- Empty query string returns validation error
- No matching tools found for obscure or overly specific capability queries
- Upstream MCP server unavailable causing partial results
- Firewall blocks legitimate but flagged tool descriptions
- Payment not processed via x402, resulting in 402 response
- Rate limiting if called too frequently

## 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://mcp-compiler.agentdiet.dev/v1/mesh/dispatch)

## Output

Returns a list of matching MCP servers or A2A tools relevant to the capability query, with metadata compressed by up to 85% for token efficiency. Results pass through a Prompt-Guard firewall to block malicious prompt injections from upstream tools. The response is a JSON object containing matched endpoints, their capabilities, 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/mcp-compiler-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-7ca07934/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcp-compiler.agentdiet.dev](https://www.zero.xyz/host/mcp-compiler.agentdiet.dev/llms.txt)