Docker Destructive Guardrails

Docker Destructive Command Guardrails

Overview

This skill provides the cross-product policy for handling destructive or irreversible Docker CLI operations: commands that delete data, remove resources, or otherwise cannot be undone. Use it whenever a task could reasonably lead to running one of these commands, even if the user never names the command directly. It covers the generic Docker CLI commands with no home in a more specific skill, and it indexes where other destructive commands (Compose, sandbox, Desktop) are documented.

When to use this skill

Activate this skill when:

• The user asks to "clean up", "clear the cache", "start fresh", "wipe everything", "nuke it", "reset", "force remove", or "tear down" Docker resources without naming a specific command
• The agent is considering docker rm, docker rm -f, docker container prune, docker kill, docker stop, docker system prune, docker rmi, docker image rm, docker image prune -a, docker network rm, docker network prune, docker builder prune, docker buildx rm, docker context rm, or standalone (non-Compose) docker volume rm/docker volume prune as a fix for an unrelated problem (disk space, a stuck container, a stale network, a broken build cache, an old builder or volume)
• The user wants a cross-product overview of destructive commands across Docker skills

Do not use this skill when

Do not use this skill when:

• The destructive command in question is Compose-specific (docker compose down -v, docker compose rm -v, docker volume rm/docker volume prune in a Compose project) — use docker-compose-patterns directly, which owns that guidance in full detail
• The task is authoring or reviewing a Dockerfile or compose.yaml with no cleanup or deletion involved
• The operation is non-Docker (git, filesystem, cloud resources) — this skill covers Docker CLI operations only

Core guidance

The core rule for every command below: state exactly what will be deleted, stopped, or lost, and get explicit confirmation from the user before running it. Never run a destructive command as a default troubleshooting or "just clean it up" reflex — disk space, stuck containers, and stale caches almost always have a narrower, non-destructive fix. See references/docker-cli-destructive-commands.md for exact flags and the safe, scoped alternative for each.

The container-lifecycle commands — docker rm, docker rm -f, docker container prune, and docker kill — don't all carry the same risk, so they're split into two tiers below instead of one flat rule. docker stop follows a related but distinct reversible-action rule right after the tiers. Every other command in this list follows the flat rule stated above with no exceptions: state what's lost, get explicit confirmation, and wait for the user's answer before running it.

Tier 1 — low-friction container cleanup

Applies only to docker rm <name> on an already-stopped container and docker rm -f <name> on a container the agent itself created and started earlier in the same session purely for testing or debugging — the -f carve-out applies even when the container is still running, since that's the only reason -f would be needed. All of the following must hold: the container is already stopped, or was created/started by the agent itself this session for testing/debugging; there's no known unpersisted state at risk; the action targets one specific, identified container rather than an unscoped sweep; and the agent is acting on an explicit user ask this session, not its own initiative. When every condition holds, the agent removes the container, states what it did, and proceeds — no blocking confirmation is required first. Tier 2's docker rm -f rule below applies to every other case.

Tier 2 — container commands needing confirmation

docker kill is always Tier 2 (see the reference for why no stopped-container exception exists for it). Also Tier 2: docker container prune (it always sweeps every stopped container on the host, never just the one the agent is cleaning up), docker rm -f on any container that doesn't meet every Tier 1 condition above (in particular, a running container the agent didn't create/start this session, or one it did but is acting on without an explicit user ask), any other unscoped sweep regardless of container state (e.g. docker rm -f $(docker ps -aq), "remove/kill all containers"), a container the agent didn't create and has no context on, and any action taken on the agent's own initiative rather than an explicit user ask. These carry the same confirmation bar as every flat-rule command in this skill: state exactly what will be lost and get explicit confirmation before running anything — no exception carved out.