list_insert_before
Insert value before pivot in list. Args: key: The name of the key pivot: The pivot value value: The value to insert Returns: Success message or error message
This record as markdown: /tools/aws/list-insert-before.md
What list_insert_before does on AWS
AI agents use list_insert_before to create or update resources in AWS, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your AWS environment.
Why list_insert_before is rated Medium
This tool modifies a list data structure by inserting a value at a specific position. This is a reversible write operation (the item can be removed), not destructive. Misuse could corrupt data structures but has limited blast radius.
From the tool's definition Insert value before pivot in list
Attacks that exploit this kind of access
The rule that runs list_insert_before safely
PolicyLayer is an MCP gateway: it sits between your AI agents and AWS, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For list_insert_before, this is the rule to start with:
list_insert_before stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect AWS, apply this rule, and every list_insert_before call is checked against it from then on.
Questions about list_insert_before
Insert value before pivot in list. Args: key: The name of the key pivot: The pivot value value: The value to insert Returns: Success message or error message. It is categorised as a Write tool in the AWS MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the AWS MCP server in PolicyLayer and add a rule for list_insert_before: 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 AWS. Nothing to install.
list_insert_before is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the list_insert_before 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 list_insert_before. 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.
list_insert_before is provided by the AWS MCP server (@awslabs/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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