# 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 whale-momentum.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, firewall-filtered results for agent tool discovery and routing.

## Facts

- Endpoint: GET https://whale-momentum.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: whale-momentum.agentdiet.dev
- Website: https://whale-momentum.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/whale-momentum-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-19fd723b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wxK5iPW8ZeZEdamtfLOnR

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 whale-momentum-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-19fd723b
```

Example prompt: Search the MCP tool index for any available servers that handle SEC filings or company enrichment — I need to find the right tool to route my next workflow step.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool to call next, especially when the available tool set is large and token budget is constrained. It is best suited for swarm-style orchestration where the agent does not know in advance which downstream tool to invoke. Prefer alternatives if you already know your target endpoint and simply need to call it directly.

## Known failure modes

- Empty query string returns 400 validation error
- No matching tools found returns empty result set
- Endpoint URL verification returns not-found if URL is not indexed
- Upstream MCP server unavailability may cause partial results
- Payment required (HTTP 402) if x402 payment header is missing or insufficient

## 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://whale-momentum.agentdiet.dev/v1/workflows/rag-context-sanitizer)

## Output

Returns a compressed, Prompt-Guard-filtered list of matching MCP servers or A2A tools relevant to the query, including tool descriptors and routing metadata, with up to 85% token reduction compared to raw index responses.

## 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/whale-momentum-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-19fd723b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from whale-momentum.agentdiet.dev](https://www.zero.xyz/host/whale-momentum.agentdiet.dev/llms.txt)