A helper for building and deploying Docker containers on bex. Docker packages an application and its runtime into an image; bex can build that image from a Dockerfile or deploy an image that was built elsewhere.

Create or troubleshoot Dockerfiles, choose between building an image and using a prebuilt one, configure private registries, and set Docker build fields in a Blueprint.

It brings Docker build choices and platform constraints into the deployment process instead of leaving them implicit. It also covers image registries, build stages, caching, secrets, and security-related configuration.

bex-docker — Skill for Claude Code and Codex by bex-co/bex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add bex-co/bex --skill bex-docker

Clone the repo

git clone --depth 1 https://github.com/bex-co/bex

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/bex-co/bex/bex-docker/github.svg)](https://agentmods.dev/skills/bex-co/bex/bex-docker)

Your own site

<a href="https://agentmods.dev/skills/bex-co/bex/bex-docker"><img src="https://agentmods.dev/badge/skills/bex-co/bex/bex-docker/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/bex-co/bex/bex-docker"><img src="https://agentmods.dev/badge/skills/bex-co/bex/bex-docker.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 83 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,965 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00083	$0.01965
Opus 5.5	$0.00033	$0.00786
Sonnet 5.5	$0.00017	$0.00393
Haiku 4.5	$0.00008	$0.00197

Measured yesterday against content hash bbea5bd5369f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

bex-docker scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

1. Retrieve the linked Markdown document directly with an available URL-fetching tool or HTTP client, such as `curl`. Do not substitute web-search summaries for the document.

lego/cli/internal/skills/pack/skills/bex-docker/SKILL.md · 149 lines

How it starts

The opening of the file, as written. The whole thing — 149 lines — stays where its author put it; the contents beside it link to each section on GitHub.

bex Docker Deployments

bex uses BuildKit for Docker builds. All compute service types that support custom runtimes can use runtime: docker (build from a Dockerfile in the repo) or runtime: image (pull a prebuilt image; no Dockerfile build on bex). Deeper patterns and copy-paste templates live under references/.

When to Use

Authoring or debugging a Dockerfile for a bex service
Choosing runtime: docker vs runtime: image in a Blueprint
Wiring private base images or prebuilt images with registry credentials
Multi-stage builds, build args, secrets, and layer caching
Performance and security hardening of container images on bex

For full Blueprint authoring, see bex-blueprints. For end-to-end deploy flows, see bex-deploy.

Before deploying a built or prebuilt image, read references/deployments.md for current trigger, lifecycle, health-check, and signal behavior.

bex Docker Builds

BuildKit is used for Docker builds on bex.
runtime: docker: bex builds an image from your repo using dockerfilePath, dockerContext, and optional dockerCommand (overrides image CMD).
runtime: image: bex pulls image.url; no repo-based image build. Set image.creds.fromRegistryCreds.name when the registry is private.

Blueprint Configuration

Field	Role
`dockerfilePath`	Path to the Dockerfile (default `./Dockerfile`)
`dockerContext`	Build context directory (what is sent to the daemon)
`dockerCommand`	Overrides the container `CMD` after the image is built
`image.url`	Image reference for `runtime: image` (registry/repo:tag or digest)
`image.creds`	Dashboard-stored credential reference for a private prebuilt image
`registryCredential`	Dashboard-stored credential reference for private base images used by `runtime: docker`

Example sketch (values illustrative):

services:
  - type: web
    name: api
    runtime: docker
    region: oregon
    plan: starter
    dockerfilePath: ./Dockerfile
    dockerContext: .
    dockerCommand: node server.js
    envVars:
      - key: PORT
        value: 10000

Read the full file on GitHub · 149 lines

Files

What ships with it

4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

yesterday First seen · 149 lines · 83 tokens per session scan A bbea5bd5369f

Subscribe to this mod's changes

bex-docker is a skill published in the GitHub repository bex-co/bex (577 stars, last pushed today), licensed Apache-2.0. It adds 83 tokens to every session and 1,965 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-29.

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