get_fibonacci_retracement

THE RISK

Low Risk

Why get_fibonacci_retracement needs a policy

Fibonacci retracement levels are mathematical calculations derived from historical price data. The tool reads input parameters and returns computed technical analysis output. It has no side effects on market data, user accounts, financial positions, or external systems.

From the tool's definition Tool name 'get_fibonacci_retracement' and description 'Calculate Fibonacci retracement levels' indicate a retrieval/calculation operation that returns technical analysis data without modifying market data, executing trades, or triggering external operations.

Documented attack patterns abuse exactly the kind of access get_fibonacci_retracement gives an agent:

POLICY

How to control get_fibonacci_retracement

PolicyLayer is an MCP gateway — it sits between your AI agents and TradingView MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_fibonacci_retracement:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_fibonacci_retracement": {}
  }
}

get_fibonacci_retracement is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register TradingView MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about get_fibonacci_retracement

What does the get_fibonacci_retracement tool do? +

Calculate Fibonacci retracement levels. It is categorised as a Read tool in the TradingView MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_fibonacci_retracement? +

Register the TradingView MCP Server MCP server in PolicyLayer and add a rule for get_fibonacci_retracement: 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 TradingView MCP Server. Nothing to install.

What risk level is get_fibonacci_retracement? +

get_fibonacci_retracement is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_fibonacci_retracement? +

Yes. Add a rate_limit block to the get_fibonacci_retracement 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.

How do I block get_fibonacci_retracement completely? +

Set action: deny in the PolicyLayer policy for get_fibonacci_retracement. 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.

What MCP server provides get_fibonacci_retracement? +

get_fibonacci_retracement is provided by the TradingView MCP Server MCP server (lev-corrupted/tradingviewmcpserver). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every TradingView MCP Server tool call.

Start from TradingView MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →