Check if a specific market is currently open for trading. Args: instrument: The OANDA instrument name (e.g., "EUR_USD", "US30_USD", "XAU_USD"). at_time: Optional ISO8601 datetime to check (e.g., "2024-01-15T14:30:00Z"). Defaults to current time if not provided. Returns: - instrument: The queried ...
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AI agents call is_market_open to retrieve information from Forex-GPT MCP Server without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though is_market_open only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"is_market_open": {}
}
}See the full Forex-GPT MCP Server policy for all 45 tools.
These attack patterns abuse exactly the kind of access is_market_open gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Check if a specific market is currently open for trading. Args: instrument: The OANDA instrument name (e.g., "EUR_USD", "US30_USD", "XAU_USD"). at_time: Optional ISO8601 datetime to check (e.g., "2024-01-15T14:30:00Z"). Defaults to current time if not provided. Returns: - instrument: The queried instrument - is_open: Boolean - True if market is open - checked_at_utc: When the check was made (UTC) - checked_at_local: Same time in instrument's local timezone - timezone: The instrument's native timezone - category: Asset category (Forex CFDs, Index CFDs, etc.) - displayName: Human-readable name - reason: Why the market is open/closed - schedule: Schedule type if available (e.g., "24/5", "24/7") - dstAffected: Whether DST affects trading hours Example: is_market_open(instrument="US30_USD") is_market_open(instrument="SUGAR_USD", at_time="2024-01-15T10:00:00-05:00"). It is categorised as a Read tool in the Forex-GPT MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Forex-GPT MCP Server MCP server in PolicyLayer and add a rule for is_market_open: 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 Forex-GPT MCP Server. Nothing to install.
is_market_open is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the is_market_open 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 is_market_open. 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.
is_market_open is provided by the Forex-GPT MCP Server MCP server (https://mcp.forex-gpt.ai/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 45 Forex-GPT MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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