lerna

Runs Lerna monorepo commands (list, run, changed, version) and returns structured package information.

SERVERDocker SOURCE@paretools/docker

High RISK CLASS

Category Execute

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-dave-london-docker/lerna.md

WHAT IT DOES

What lerna does on Docker

AI agents invoke lerna to trigger actions in Docker. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

RISK

Why lerna is rated High

Lerna's 'run' command executes lifecycle scripts and arbitrary tasks defined in monorepo packages, making this an Execute category tool. While 'list' and 'changed' are read-only, the presence of 'run' and 'version' commands means the tool permits code execution and state modification.

From the tool's definition Tool description states it 'Runs Lerna monorepo commands' including 'run', which executes arbitrary scripts defined in package.json files across monorepo packages. The 'version' command can also modify package.json and tag releases in version control.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs lerna safely

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

lerna Rate-limited

lerna stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "lerna": {
      "limits": [
        {
          "counter": "lerna_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about lerna

What does the lerna tool do? +

Runs Lerna monorepo commands (list, run, changed, version) and returns structured package information. It is categorised as a Execute tool in the Docker MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on lerna? +

Register the Docker MCP server in PolicyLayer and add a rule for lerna: 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 Docker. Nothing to install.

What risk level is lerna? +

lerna is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit lerna? +

Yes. Add a rate_limit block to the lerna 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 lerna completely? +

Set action: deny in the PolicyLayer policy for lerna. 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 lerna? +

lerna is provided by the Docker MCP server (@paretools/docker). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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