AI agents call get_price_history to retrieve information from Schwab without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves historical price data without modifying any account state, executing trades, or moving funds. It is a read-only query operation with no side effects. Despite the empty description, the tool name and server context clearly establish it as a market data retrieval function. No blast radius for misuse—at worst, an agent retrieves unnecessary price history.
From the tool's definition Tool name 'get_price_history' indicates retrieval of historical market data. Server context describes 'market data retrieval' as a core capability.
Attacks that exploit this kind of access
get_price_history. It is categorised as a Read tool in the Schwab MCP Server, which means it retrieves data without modifying state.
Register the Schwab MCP server in PolicyLayer and add a rule for get_price_history: 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 Schwab. Nothing to install.
get_price_history 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_price_history 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_price_history. 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_price_history is provided by the Schwab MCP server (k1xme/schwab-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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