// SCAN REPORT

MCP YFinance Stock Server

18 tools. 2 can modify or destroy data without limits.

1 destructive tool with no built-in limits. Policy required.

Last updated: 4 Jul 2026

2 can modify or destroy data

16 read-only

18 tools total

Community server · catalogue entry verified 04/07/2026

How to control MCP YFinance Stock Server ↓

TOOL MAP

What MCP YFinance Stock Server exposes to your agents

Read (16) Write / Execute (1) Destructive / Financial (1)

Running more than one server? Check your whole stack →

MOST DANGEROUS TOOLS

Critical Risk

The most dangerous MCP YFinance Stock Server tools

Destructive · Medium remove_from_watchlist Removing an item from a watchlist is a destructive operation in the sense that it irreversibly deletes that entry from the list. Write · Medium add_to_watchlist This tool modifies user state by adding stocks to a watchlist—a reversible write operation.

2 of MCP YFinance Stock Server's 18 tools can modify, destroy, or commit something on every call — and an agent calls them with no built-in limits.

POLICY

How to control MCP YFinance Stock Server

PolicyLayer is an MCP gateway — it sits between your AI agents and MCP YFinance Stock Server, and nothing reaches the server without passing your rules. These are the rules we recommend:

Deny destructive operations

{
  "remove_from_watchlist": {
    "deny_if": [
      {
        "conditions": [],
        "on_deny": "Blocked by default. Requires approval."
      }
    ]
  }
}

Destructive tools should never be available to autonomous agents without human approval.

Rate limit write operations

{
  "add_to_watchlist": {
    "limits": [
      {
        "counter": "add_to_watchlist_per_hour",
        "window": "hour",
        "max": 30,
        "scope": "grant"
      }
    ]
  }
}

Prevents bulk unintended modifications from agents caught in loops.

Cap read operations

{
  "compare_stocks": {
    "limits": [
      {
        "counter": "compare_stocks_per_minute",
        "window": "minute",
        "max": 60,
        "scope": "grant"
      }
    ]
  }
}

Controls API costs and prevents retry loops from exhausting upstream rate limits.

Create a free account and register MCP YFinance Stock Server — nothing to install.
Add these rules — paste them, or build them visually. Tune the limits to your setup.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

ENFORCE POLICY ON MCP YFINANCE STOCK →

Instant setup, no code required.

FULL CATALOGUE

All 18 MCP YFinance Stock Server tools

DESTRUCTIVE 1 tools

Destructive remove_from_watchlist remove_from_watchlist

WRITE 1 tools

Write add_to_watchlist add_to_watchlist

READ 16 tools

Read compare_stocks compare_stocks Read get_bollinger_bands get_bollinger_bands Read get_financial_statement get_financial_statement Read get_historical_stock_prices get_historical_stock_prices Read get_holder_info get_holder_info Read get_macd get_macd Read get_moving_averages get_moving_averages Read get_recommendations get_recommendations Read get_rsi get_rsi Read get_stock_info get_stock_info Read get_stock_price get_stock_price Read get_technical_summary get_technical_summary Read get_watchlist get_watchlist Read get_watchlist_prices get_watchlist_prices Read get_yahoo_finance_news get_yahoo_finance_news Read ping ping

EXPLORE

Related servers

Other MCP servers with similar tools — same risk classification, starter policies for each.

FAQ

Questions about MCP YFinance Stock Server

Can an AI agent delete data through the MCP YFinance Stock Server MCP server? +

Yes. The MCP YFinance Stock Server server exposes 1 destructive tools including remove_from_watchlist. These permanently remove resources with no undo. PolicyLayer blocks destructive tools by default so they never reach the upstream server.

How do I prevent bulk modifications through MCP YFinance Stock Server? +

The MCP YFinance Stock Server server has 1 write tools including add_to_watchlist. Set a rate limit in your policy -- for example, 10 calls per hour prevents an agent from making more than 10 modifications per hour. PolicyLayer enforces this at the gateway, before calls reach MCP YFinance Stock Server.

How many tools does the MCP YFinance Stock Server MCP server expose? +

18 tools across 3 categories: Destructive, Read, Write. 16 are read-only. 2 can modify, create, or delete data.

How do I enforce a policy on MCP YFinance Stock Server? +

Register the MCP YFinance Stock Server MCP server in PolicyLayer, apply the suggested rules above (adjust the limits to your use case), and point your AI client at the PolicyLayer proxy URL instead of the server directly. Your agents keep the same tools; PolicyLayer evaluates every call against policy before it executes. Nothing to install, live in minutes.

Enforce policy on every MCP YFinance Stock Server tool call.

Deterministic rules across all 18 MCP YFinance Stock Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

ENFORCE POLICY ON MCP YFINANCE STOCK →

Instant setup, no code required.

18 MCP YFinance Stock Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.