Load ANY stock tickers into the screener database. Supports ALL markets: US, Indian NSE (.NS), BSE (.BO), UK (.L), crypto (BTCUSD), and more. Computes ALL technical indicators (RSI, MACD, BB, SMA, EMA, Ichimoku, Stochastic, ATR, ADX, OBV, candlestick patterns, etc.) AND financial ratios (P/E, P/B...
Risk signalsBulk/mass operation — affects multiple targets
Part of the Technical Analysis server.
Free to start. No card required.
AI agents use market_update_data to create or modify resources in Technical Analysis. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call market_update_data repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Technical Analysis.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"market_update_data": {
"limits": [
{
"counter": "market_update_data_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Technical Analysis policy for all 11 tools.
These attack patterns abuse exactly the kind of access market_update_data gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Load ANY stock tickers into the screener database. Supports ALL markets: US, Indian NSE (.NS), BSE (.BO), UK (.L), crypto (BTCUSD), and more. Computes ALL technical indicators (RSI, MACD, BB, SMA, EMA, Ichimoku, Stochastic, ATR, ADX, OBV, candlestick patterns, etc.) AND financial ratios (P/E, P/B, ROE, margins, Piotroski score, Altman Z-score, etc.) in parallel batches and stores them for instant screening via screen_stocks(). Uses market-aware staleness: US stocks refresh after 4PM ET close, Indian stocks after 3:30PM IST close, crypto every 2 hours. Fundamentals (FMP ratios, financials) are cached for 7 days — only OHLCV + technicals are recalculated on each refresh. Args: tickers: List of ticker symbols. Use correct suffix for market: Indian NSE: ["RELIANCE.NS", "TCS.NS"] Indian BSE: ["RELIANCE.BO"] Crypto: ["BTCUSD", "ETHUSD"] US: ["AAPL", "MSFT"] (no suffix) If omitted, defaults to S&P 500 constituents. bg_task: If True (default), runs in background and returns immediately. Set to False to wait for completion before screening. limit: Limit number of stocks to update (for testing).. It is categorised as a Write tool in the Technical Analysis MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Technical Analysis MCP server in PolicyLayer and add a rule for market_update_data: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Technical Analysis. Nothing to install.
market_update_data is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the market_update_data rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for market_update_data. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
market_update_data is provided by the Technical Analysis MCP server (ta-mcp/technical-analysis-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 11 Technical Analysis tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.