# 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 polymarket-odds.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).

Searches 500+ indexed MCP servers and A2A tools by capability query, returning compressed, prompt-guard-filtered results for agent tool discovery and routing

## Facts

- Endpoint: GET https://polymarket-odds.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: polymarket-odds.agentdiet.dev
- Website: https://polymarket-odds.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/polymarket-odds-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-57f1f0c4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Y4TVIkCYkU0j-Ve4wkMoq

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 polymarket-odds-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-57f1f0c4
```

Example prompt: Search the MCP tool index for any servers or A2A agents that can handle SEC filings or company enrichment — I need to find what's available and get back compressed, safe-to-use context.

## 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 without hardcoding tool lists. It is especially useful when you want compressed, safe output (token-efficient, prompt-injection-filtered) for downstream LLM consumption. Prefer it over manual tool registries when working within a swarm or multi-agent architecture that needs real-time tool routing.

## Known failure modes

- Empty query string returns validation error (query minLength:1 required)
- Query matches no indexed tools — returns empty result set
- Endpoint URL verification fails if URL not in index
- Payment not completed (HTTP 402) blocks response
- Prompt-Guard firewall may reject queries containing injection-like patterns
- Response schema is generic object — field names may vary or be undocumented

## 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://polymarket-odds.agentdiet.dev/v1/workflows/rag-context-sanitizer)

## Output

Returns a compressed, prompt-guard-filtered object containing matching MCP server and A2A tool records relevant to the query, with 85% token compression applied to reduce downstream LLM cost. Results may include tool names, capability descriptions, endpoint URLs, and safety verdicts.

## 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/polymarket-odds-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-57f1f0c4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from polymarket-odds.agentdiet.dev](https://www.zero.xyz/host/polymarket-odds.agentdiet.dev/llms.txt)