AI agents call get_market_historical_index to retrieve information from CasualMarket without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool appears to retrieve historical index data without modifying, deleting, or executing transactions. Despite the empty description, the naming convention and context of sibling tools (all read operations for financial data) strongly suggest this is a data retrieval function.
From the tool's definition Tool name 'get_market_historical_index' indicates retrieval of historical market data; no description provided but naming pattern suggests query-only operation consistent with sibling read tools like 'get_company_balance_sheet' and 'get_company_profile' on…
Documented attack patterns abuse exactly the kind of access get_market_historical_index gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and CasualMarket, and nothing reaches the server without passing your rules. This is the rule we recommend for get_market_historical_index:
{
"version": "1",
"default": "deny",
"tools": {
"get_market_historical_index": {}
}
}get_market_historical_index is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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get_market_historical_index. It is categorised as a Read tool in the CasualMarket MCP Server, which means it retrieves data without modifying state.
Register the CasualMarket MCP server in PolicyLayer and add a rule for get_market_historical_index: 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 CasualMarket. Nothing to install.
get_market_historical_index 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 get_market_historical_index 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 get_market_historical_index. 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.
get_market_historical_index is provided by the CasualMarket MCP server (sacahan/casualmarket). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from CasualMarket, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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23 CasualMarket tools catalogued and risk-classified — across an index of 43,000+ MCP servers.