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.
npx agentmods add skills/render-oss/render-plugin-claude-code/render-dockernpx skills add render-oss/render-plugin-claude-code --skill render-dockergit clone --depth 1 https://github.com/render-oss/render-plugin-claude-codeWhat 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 | $0.00080 | $0.01514 |
| Opus 5 | $0.00040 | $0.00757 |
| Sonnet 5 | $0.00016 | $0.00303 |
| Haiku 4.5 | $0.00008 | $0.00151 |
Grade A, and why
render-docker scanned grade A with 0 findings 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 2d ago.
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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
This is a copy
86% identical to render-docker — 10 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 129 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Render Docker Deployments
Render 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 Render). Deeper patterns and copy-paste templates live under references/.
When to Use
- Authoring or debugging a Dockerfile for a Render service
- Choosing
runtime: dockervsruntime: imagein 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 Render
For full Blueprint authoring, see render-blueprints. For end-to-end deploy flows, see render-deploy.
Render Docker Builds
- BuildKit is used for Docker builds on Render.
runtime: docker: Render builds an image from your repo usingdockerfilePath,dockerContext, and optionaldockerCommand(overrides imageCMD).runtime: image: Render pullsimage.url; no repo-based image build. Pair withregistryCredentialwhen 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) |
registryCredential |
Auth for private pulls; often fromRegistryCreds → Dashboard-stored credential |
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
For runtime: image, set image.url and, if needed, registryCredential per Registry Configuration below.
What ships with it
3 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.
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.
- 2d ago First seen · 129 lines · 80 tokens per session scan A dc892116e869
render-docker is a skill published in the GitHub repository render-oss/render-plugin-claude-code (0 stars, last pushed 13d ago), licensed MIT. It adds 80 tokens to every session and 1,514 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. It is 86% identical to render-docker, differing in 10 lines, and is treated as a copy.
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