List all Lambda functions in the account with basic performance info
AI agents call list_lambda_functions to retrieve information from Lambda Performance MCP Server 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 existing Lambda function data and their performance metrics. It performs no creation, modification, deletion, or execution of code. While it exposes information about all Lambda functions in the account (which could reveal some infrastructure details), the risk is inherent to read-only retrieval and is low—typical for administrative visibility tools.
From the tool's definition Tool name is 'list_lambda_functions' and description states it 'List all Lambda functions in the account with basic performance info'. The verb 'list' is a retrieval operation with no modification or side effects.
Attacks that exploit this kind of access
List all Lambda functions in the account with basic performance info. It is categorised as a Read tool in the Lambda Performance MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Lambda Performance MCP Server MCP server in PolicyLayer and add a rule for list_lambda_functions: 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 Lambda Performance MCP Server. Nothing to install.
list_lambda_functions 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 list_lambda_functions 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_lambda_functions. 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_lambda_functions is provided by the Lambda Performance MCP Server MCP server (jghidalgo/lambda-performance-mcp-nodejs). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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