# Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router (RAG Context Sanitizer)

> Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router (RAG Context Sanitizer) 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 a meta-index of 500+ MCP servers and A2A tools by capability query, returning compressed, prompt-guard-filtered results for tool discovery and endpoint verification.

## Facts

- Endpoint: GET https://mcp-compiler.agentdiet.dev/v1/workflows/rag-context-sanitizer?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-60610141
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_egqZi5yXkJOFuhI1wXtPP

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-60610141
```

Example prompt: Search the MCP tool index for capability 'SEC filings retrieval' and return the best matching servers with compressed context — I want to find which tools I can route that task through.

## When to prefer this

Choose this endpoint when an AI agent needs to discover which MCP servers or A2A tools support a given capability without connecting to each one individually, or when verifying that a specific endpoint URL is MCP/A2A compliant. It is especially useful when token budget is constrained, thanks to 85% compression, and when prompt injection safety is a concern via the built-in Prompt-Guard firewall.

## Known failure modes

- Missing or empty 'query' parameter returns a validation error
- Query with no matching tools returns empty result set
- Unrecognized or unreachable endpoint URL returns verification failure
- Service unavailability or upstream index timeout returns 5xx error
- Overly broad queries may return too many low-relevance results

## 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/workflows/rag-context-sanitizer)

## Output

Returns a structured object listing matching MCP servers and A2A tools for the queried capability, with 85% token-compressed context and prompt-guard-filtered metadata, or endpoint verification status if a URL was supplied.

## 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-60610141/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)