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 skills add digitalocean-labs/do-app-platform-skills --skill designergit clone --depth 1 https://github.com/digitalocean-labs/do-app-platform-skillsWrote 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.
[](https://agentmods.dev/skills/digitalocean-labs/do-app-platform-skills/designer)<a href="https://agentmods.dev/skills/digitalocean-labs/do-app-platform-skills/designer"><img src="https://agentmods.dev/badge/skills/digitalocean-labs/do-app-platform-skills/designer/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.
<a href="https://agentmods.dev/skills/digitalocean-labs/do-app-platform-skills/designer"><img src="https://agentmods.dev/badge/skills/digitalocean-labs/do-app-platform-skills/designer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00040 | $0.02291 |
| Opus 5 | $0.00020 | $0.01145 |
| Sonnet 5 | $0.00008 | $0.00458 |
| Haiku 4.5 | $0.00004 | $0.00229 |
Grade A, and why
app-platform-designer 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 10d 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.
How it starts
The opening of the file, as written. The whole thing — 346 lines — stays where its author put it; the contents beside it link to each section on GitHub.
App Platform Designer Skill
Transform natural language descriptions into production-ready App Platform specifications.
Primary question: "I want to build [description]. What should my App Platform architecture look like?"
Produces:
.do/app.yaml— App Platform specification.do/deploy.template.yaml— Deploy to DO button (public repos).env.example— Environment variable template
Quick Decision
What do you need?
├── Design new app from description → Workflow 1
├── Analyze repo and create spec → Workflow 2
├── Add Deploy to DO button → Workflow 3
└── Multi-environment setup → Workflow 4
Workflow 1: Natural Language → App Spec
Trigger: "I need a web app with [description]"
-
Gather requirements:
- What does the app do?
- Language/framework?
- Database needs?
- Background processing?
-
Decompose into components:
- HTTP-facing →
services - Background processors →
workers - One-time/scheduled →
jobs - Static frontends →
static_sites - Data stores →
databases
- HTTP-facing →
-
Generate spec with health checks, env vars, routing
-
Validate:
doctl apps spec validate .do/app.yaml
Full guide: See architecture-patterns.md
Workflow 2: Analyze Repository → App Spec
Trigger: "Here's my repo, create an app spec"
Check for:
├── Dockerfile → Use dockerfile build
├── package.json → Node.js app
├── requirements.txt / pyproject.toml → Python app
├── go.mod → Go app
├── Multiple directories with above → Monorepo
Full guide: See component-types.md
Workflow 3: Deploy to DO Button
Trigger: "Add Deploy to DigitalOcean button"
Requirements: Public GitHub repository
- Create
.do/deploy.template.yaml(wraps spec inspec:key, usesgit:block) - Add button to README
[](https://cloud.digitalocean.com/apps/new?repo=https://github.com/OWNER/REPO/tree/BRANCH)
What ships with it
6 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.
- 10d ago First seen · 346 lines · 40 tokens per session scan A 41a39d765392
app-platform-designer is a skill published in the GitHub repository digitalocean-labs/do-app-platform-skills (36 stars, last pushed 4d ago), licensed MIT. It adds 40 tokens to every session and 2,291 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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