lambda_list_functions

List Lambda functions

SERVERNcp SOURCE@portel/ncp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-portel-dev-ncp/lambda-list-functions.md

WHAT IT DOES

What lambda_list_functions does on Ncp

AI agents call lambda_list_functions to retrieve information from Ncp without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why lambda_list_functions is rated Low

This tool retrieves and lists Lambda functions without executing them, modifying their configuration, or deleting them. It is a read-only operation that queries the state of AWS Lambda resources. The blast radius is minimal—misuse would only expose information about existing functions, not trigger unintended code execution or resource destruction.

From the tool's definition Tool name 'lambda_list_functions' and description 'List Lambda functions' indicate a query/retrieval operation with no modification or execution of resources.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs lambda_list_functions safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Ncp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For lambda_list_functions, this is the rule to start with:

lambda_list_functions Allowed

lambda_list_functions is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "lambda_list_functions": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Ncp, apply this rule, and every lambda_list_functions call is checked against it from then on.

FAQ

Questions about lambda_list_functions

What does the lambda_list_functions tool do? +

List Lambda functions. It is categorised as a Read tool in the Ncp MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on lambda_list_functions? +

Register the Ncp MCP server in PolicyLayer and add a rule for lambda_list_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 Ncp. Nothing to install.

What risk level is lambda_list_functions? +

lambda_list_functions is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit lambda_list_functions? +

Yes. Add a rate_limit block to the lambda_list_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.

How do I block lambda_list_functions completely? +

Set action: deny in the PolicyLayer policy for lambda_list_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.

What MCP server provides lambda_list_functions? +

lambda_list_functions is provided by the Ncp MCP server (@portel/ncp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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