AI agents call get_instruments to retrieve information from Redcap without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves metadata about instruments in a REDCap project without creating, modifying, deleting, or executing any operations. It is a straightforward read-only query operation with minimal security risk even if misused by an AI agent.
From the tool's definition Tool name is 'get_instruments' and description states 'Get the list of instruments (forms/surveys) in the REDCap project.' The verb 'Get' and action of retrieving a list indicate data retrieval with no modification or side effects.
Attacks that exploit this kind of access
Get the list of instruments (forms/surveys) in the REDCap project. It is categorised as a Read tool in the Redcap MCP Server, which means it retrieves data without modifying state.
Register the Redcap MCP server in PolicyLayer and add a rule for get_instruments: 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 Redcap. Nothing to install.
get_instruments 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_instruments 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_instruments. 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_instruments is provided by the Redcap MCP server (msicilia/mcp-server-redcap). 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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