string_increment_float
Increment float value. Args: key: The name of the key amount: Amount to increment by Returns: New value or error message
This record as markdown: /tools/aws/string-increment-float.md
What string_increment_float does on AWS
AI agents use string_increment_float 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 string_increment_float is rated Medium
This tool modifies an existing float value stored at a key by incrementing it by a specified amount. This is a reversible write operation (the value can be decremented back). The severity is medium because modifying stored values could affect application logic, counters, or metrics, but it is not destructive or financial in nature.
From the tool's definition Increment float value... Amount to increment by... Returns: New value
Attacks that exploit this kind of access
The rule that runs string_increment_float 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 string_increment_float, this is the rule to start with:
string_increment_float 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 string_increment_float call is checked against it from then on.
Questions about string_increment_float
Increment float value. Args: key: The name of the key amount: Amount to increment by Returns: New value 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 string_increment_float: 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.
string_increment_float 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 string_increment_float 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 string_increment_float. 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.
string_increment_float 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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