io.github.lkcair/yfinance-ai

yfinance-ai: Yahoo Finance

Is the yfinance-ai MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-27.

Yahoo Finance in 68 tools: stocks, crypto, forex, commodities, funds, options, analysts, calendars.

alive probed 2026-11-14 · unchanged since 2026-10-27

68tools

12ktokens in Claude Opus 5.5

6.0 %of Claude's 200k window

4.7×the median server

4.0 sto initialize

9 msto list tools

Run it: uvx yfinance-ai@5.0.5 (stdio, probed in a container with the network off)
Host: pypi.org
Reports itself as: yfinance-ai 5.0.5
Capabilities: prompts, resources, tools
Instructions: 1 938 characters
Of a 1M window: 1.2 % of a 1M context window
Count: 12k tokens in Claude Opus 5.5, exact, measured 2026-10-27. With the Claude Code prefix mcp__…__ on each tool name: 13k. The o200k_base estimate is 6.3k. Counted again when the tool definitions change. Method.
Repository: https://github.com/lkcair/yfinance-ai-mcp
Website: https://github.com/lkcair/yfinance-ai
Registry: active, updated 2026-10-21 · registry entry

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.90×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
get_historical_data	401	211	3 %
get_market_movers	335	176	3 %
get_complete_analysis	310	163	3 %
download_multiple_tickers	285	150	2 %
run_self_test	262	138	2 %

Other registry entries on pypi.org, the ones next to this name; all of them.

Servers that mention yfinance.

The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.

Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.