@evidinvest/aether-mcp

@evidinvest/aether-mcp

Stdio MCP server for Aether. One-line install for Claude Desktop, Cursor, Cline, Continue — anything that spawns an MCP server as a subprocess over stdio.

Aether is a financial-vertical agent search engine + marketplace: hybrid SEC filings + earnings-transcript retrieval over 1.4M+ chunks, plus a two-sided marketplace for third-party data.

Public surface — two hosts

Host	Use
https://aether.evidinvest.com	MCP protocol (/mcp), OAuth + account creation (/v1/oauth/*, /v1/agent/*), marketing + dashboard. Use this URL when telling an MCP client where Aether lives.
https://api.aether.evidinvest.com	Search-engine tool calls only (/v1/tools/*). Direct REST surface for clients that don't want to speak MCP.

This package wraps the HTTP endpoints so MCP clients that only speak stdio can still use Aether without thinking about which host serves what.

Install

# No install needed — runs straight from npx:
npx -y @evidinvest/aether-mcp

# Or install globally for slightly faster startup:
npm install -g @evidinvest/aether-mcp
aether-mcp

Configure your MCP client

Claude Desktop

Edit ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):

{
  "mcpServers": {
    "aether": {
      "command": "npx",
      "args": ["-y", "@evidinvest/aether-mcp"]
    }
  }
}

For higher rate limits + paid marketplace access, add your Aether API key:

{
  "mcpServers": {
    "aether": {
      "command": "npx",
      "args": ["-y", "@evidinvest/aether-mcp"],
      "env": {
        "AETHER_API_KEY": "aether_ak_…"
      }
    }
  }
}

Cursor

.cursor/mcp.json in your workspace, or ~/.cursor/mcp.json globally:

{
  "mcpServers": {
    "aether": {
      "command": "npx",
      "args": ["-y", "@evidinvest/aether-mcp"]
    }
  }
}

Cline / Continue / other clients

Any client that supports MCP stdio servers takes the same shape — name, command, args, optional env.

Tools exposed

Auto-discovered on startup from ${AETHER_API_BASE_URL}/v1/tools (defaults to https://api.aether.evidinvest.com/v1/tools):

Tool	Purpose
financial_search	Hybrid SEC filing retrieval (BM25 + 256-d arctic-embed + cross-encoder rerank)
transcript_search	Earnings-call transcript segment search
list_partners	List marketplace sellers + per-call prices
partner_search	Search a partner's indexed corpus (Mode A, free)
partner_proxy_search	Route query to partner's API server-to-server (Mode B, per-call paid)
seller_signup	Register as a marketplace seller
seller_publish_document	Publish a document into Aether's index
seller_register_endpoint	Register a proxy endpoint
seller_list_my_documents	List own documents
seller_list_my_endpoints	List own endpoints

Environment

Variable	Default	Effect
AETHER_API_BASE_URL	https://api.aether.evidinvest.com	Override host for tool calls (/v1/tools/*). Use http://localhost:8787 for local dev.
AETHER_MCP_BASE_URL	https://aether.evidinvest.com	Override host for OAuth + account creation (/v1/oauth/*, /v1/agent/*). Use http://localhost:8787 for local dev.
AETHER_BASE_URL	deprecated	If set, overrides BOTH hosts. Kept for back-compat with aether-mcp@0.2.x.
AETHER_API_KEY	(empty)	If set, attached as Authorization: Bearer <key> to every tool call. Use a seller key (aether_sk_…) for seller actions OR an agent key (aether_ak_…) for higher search rate limits + paid proxy access.

Smoke-test from the command line

{
  echo '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"smoke","version":"0.0"}}}'
  sleep 0.2
  echo '{"jsonrpc":"2.0","method":"notifications/initialized"}'
  sleep 0.2
  echo '{"jsonrpc":"2.0","id":2,"method":"tools/list"}'
  sleep 1
} | npx -y @evidinvest/aether-mcp

Expected: handshake reply on stdout, plus a tools/list response with 10 tool definitions.

Architecture

MCP client (Claude Desktop / Cursor / Cline)
       │ JSON-RPC over stdio
       ▼
@evidinvest/aether-mcp (this package, Node)
       │
       ├──► HTTPS  aether.evidinvest.com/v1/oauth/*      (device-code auth, token refresh)
       └──► HTTPS  api.aether.evidinvest.com/v1/tools/*  (tool discovery + calls)
                                  │
                                  ├──► Vespa (filing_chunk + transcript_segment + partner_document)
                                  ├──► Embedder + reranker (BAAI/bge-reranker-v2-m3 on CPU)
                                  └──► Postgres (sellers, agents, marketplace state)

MCP clients that want to skip this stdio wrapper can connect directly to the StreamableHTTP transport at https://aether.evidinvest.com/mcp — same surface, no Node subprocess needed.

Tool defs are discovered once on startup; any new tools added upstream show up after restart without releasing a new npm version.

License

Apache-2.0. Source: https://github.com/EvidInvest/aether-developer/tree/main/mcp