AI agents call get_investment_transactions to retrieve information from Plaid without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries investment transaction history based on date filters. It is a read-only operation that does not create, modify, delete, or execute external actions. While the severity is medium rather than low due to the sensitive financial nature of the data being accessed (investment account transactions), the tool itself performs no write, execute, or destructive operations.
From the tool's definition Tool name 'get_investment_transactions' and description 'Buy/sell/dividend/transfer activity in investment accounts within a date range. Returns one row per transaction.' indicate a query/retrieval operation with no modification of data.
Attacks that exploit this kind of access
Buy/sell/dividend/transfer activity in investment accounts within a date range. Returns one row per transaction. Date arguments are inclusive YYYY-MM-DD. It is categorised as a Read tool in the Plaid MCP Server, which means it retrieves data without modifying state.
Register the Plaid MCP server in PolicyLayer and add a rule for get_investment_transactions: 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 Plaid. Nothing to install.
get_investment_transactions 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_investment_transactions 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_investment_transactions. 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_investment_transactions is provided by the Plaid MCP server (wilderfield/plaid-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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