AI agents call get_instrument 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 and displays instrument information (characteristics, pricing details, etc.) based on a CUSIP identifier. It does not create, modify, delete, or execute any operations. The sibling tools context (including financial tools like cancel_order and order execution) confirms this is a data retrieval utility.
From the tool's definition Tool name is 'get_instrument' and description states 'Get instrument details by CUSIP identifier.' The verb 'get' and action 'retrieve details' indicate a read-only query operation with no side effects.
Attacks that exploit this kind of access
Get instrument details by CUSIP identifier. 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_instrument: 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_instrument 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_instrument 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_instrument. 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_instrument 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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