lowdown-proxy records interactions between AI agents, tools, and services — and makes that history queryable by anyone. Before choosing a tool, calling an API, or delegating to another agent, you can ask: what has the community seen from this one?

A transparent stdio proxy for MCP servers is the first entry point. The reputation layer is open to any agent, tool, or service — not just MCP.

See DESIGN.md for background and design principles.

Quick start

npx lowdown-proxy -- npx some-mcp-server

Wrap any MCP server in your client config:

// before
{
  "mcpServers": {
    "search": { "command": "npx", "args": ["search-mcp-server"] }
  }
}

// after
{
  "mcpServers": {
    "search": {
      "command": "npx",
      "args": ["lowdown-proxy", "--target", "search-mcp-server", "--", "npx", "search-mcp-server"]
    }
  }
}

Options

Flag	Description	Default
`--actor`	Identifier of the calling agent	`anonymous`
`--target`	Label for the target tool	command string
`--source`	`organic` \| `seeded` \| `synthetic`	`organic`

Environment variables

Required for recording. The proxy works as a pure pass-through without them.

export LOWDOWN_SUPABASE_URL="https://xxxx.supabase.co"
export LOWDOWN_SUPABASE_KEY="..."

Public API

No auth required.

# Get reputation of a tool
curl https://lowdown-proxy.vercel.app/api/reputation/brave-search

# Record an interaction
curl -X POST https://lowdown-proxy.vercel.app/api/interactions \
  -H "Content-Type: application/json" \
  -d '{"actor":"agent:my-bot","target":"mcp:modelcontextprotocol/brave-search","target_type":"tool","task_type":"web_search","outcome":"success"}'

Example response:

{
  "target": "brave-search",
  "target_type": "tool",
  "interactions": 30,
  "success_rate": 0.933,
  "confidence": "medium"
}

Fuzzy matching supported — short names like brave-search, fetch, github resolve automatically.

Design principles

Pass-through first: recording never blocks or degrades MCP communication.
Facts only: v0 records success/failure and latency. Quality judgments are out of scope.
Provenance always tagged: every record carries organic / seeded / synthetic so bootstrap data and real traffic are always distinguishable.

Status

30-day public experiment, started September 2026. See DESIGN.md for what's in scope and what's been ruled out.

License

MIT

한국어

한 번도 거래한 적 없는 상대를 에이전트가 무조건 신뢰할 필요는 없습니다.

lowdown-proxy는 AI 에이전트, 도구, 서비스 사이의 상호작용을 기록하고, 그 이력을 누구나 조회할 수 있게 만듭니다. 도구를 선택하거나, API를 호출하거나, 다른 에이전트에게 작업을 위임하기 전에 물어볼 수 있습니다: 커뮤니티는 이 상대에 대해 무엇을 봤는가?

MCP 서버를 감싸는 stdio 프록시가 첫 번째 진입점입니다. 평판 레이어는 MCP에 국한되지 않고 모든 에이전트, 도구, 서비스에 열려 있습니다.

기록된 데이터는 다른 에이전트가 판단할 때 참고할 수 있는 최소한의 공통 근거가 됩니다.