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 pproenca/dot-skills --skill 12-factor-appgit clone --depth 1 https://github.com/pproenca/dot-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/pproenca/dot-skills/12-factor-app)<a href="https://agentmods.dev/skills/pproenca/dot-skills/12-factor-app"><img src="https://agentmods.dev/badge/skills/pproenca/dot-skills/12-factor-app.svg" alt="Measured on agentmods" 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 | $0.00057 | $0.02039 |
| Opus 5 | $0.00028 | $0.01019 |
| Sonnet 5 | $0.00011 | $0.00408 |
| Haiku 4.5 | $0.00006 | $0.00204 |
Grade A, and why
12-factor-app 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 8d 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 — 141 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Community Cloud-Native Applications Best Practices
Comprehensive methodology for building modern software-as-a-service applications that are portable, scalable, and maintainable. Contains 51 rules across 12 categories, covering the entire application lifecycle from codebase management to production operations.
When to Apply
Reference these guidelines when:
- Designing new backend services or APIs
- Containerizing applications for Kubernetes or Docker
- Setting up CI/CD pipelines
- Managing configuration across environments
- Implementing logging and monitoring
- Planning application scaling strategy
- Debugging deployment or environment issues
Rule Categories by Priority
| Priority | Category | Impact | Prefix |
|---|---|---|---|
| 1 | Codebase & Version Control | CRITICAL | code- |
| 2 | Dependencies | CRITICAL | dep- |
| 3 | Configuration | CRITICAL | config- |
| 4 | Backing Services | HIGH | svc- |
| 5 | Build, Release, Run | HIGH | build- |
| 6 | Processes & State | HIGH | proc- |
| 7 | Concurrency & Scaling | HIGH | scale- |
| 8 | Disposability | HIGH | disp- |
| 9 | Port Binding | MEDIUM | port- |
| 10 | Dev/Prod Parity | MEDIUM | parity- |
| 11 | Logging | MEDIUM | log- |
| 12 | Admin Processes | MEDIUM | admin- |
Quick Reference
1. Codebase & Version Control (CRITICAL)
code-single-codebase- Maintain one codebase per application in version controlcode-one-app-one-repo- Enforce one-to-one correlation between codebase and applicationcode-deploys-not-branches- Use deploys not branches to represent environmentscode-shared-as-libraries- Factor shared code into libraries managed by dependency manager
2. Dependencies (CRITICAL)
dep-explicit-declaration- Declare all dependencies explicitly in a manifest filedep-isolate-execution- Isolate dependencies to prevent system package leakagedep-no-system-tools- Never rely on implicit system tools being availabledep-deterministic-builds- Use lockfiles for deterministic dependency resolution
What ships with it
55 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.
- AGENTS.md 12 KB
- assets/templates/_template.md 977 B
- metadata.json 862 B
- references/_sections.md 2.3 KB
- references/admin-one-off-processes.md 3.0 KB
- references/admin-repl-access.md 3.5 KB
- references/admin-same-environment.md 2.8 KB
- references/build-artifact-per-commit.md 2.7 KB
- references/build-complexity-in-build.md 2.3 KB
- references/build-immutable-releases.md 2.4 KB
- references/build-no-runtime-changes.md 2.5 KB
- references/build-separate-stages.md 2.3 KB
- references/code-deploys-not-branches.md 1.9 KB
- references/code-one-app-one-repo.md 1.8 KB
- references/code-shared-as-libraries.md 1.8 KB
- references/code-single-codebase.md 1.6 KB
- references/config-never-commit-secrets.md 2.2 KB
- references/config-no-env-groups.md 2.2 KB
- references/config-separate-from-code.md 1.8 KB
- references/config-use-env-vars.md 1.8 KB
- references/config-validate-on-startup.md 2.4 KB
- references/dep-deterministic-builds.md 1.9 KB
- references/dep-explicit-declaration.md 1.9 KB
- references/dep-isolate-execution.md 1.9 KB
- references/dep-no-system-tools.md 2.1 KB
- references/disp-crash-only.md 3.4 KB
- references/disp-disposable-processes.md 2.6 KB
- references/disp-fast-startup.md 3.1 KB
- references/disp-graceful-shutdown.md 3.0 KB
- references/disp-idempotent-operations.md 3.4 KB
- references/log-event-streams.md 3.1 KB
- references/log-no-routing.md 2.6 KB
- references/log-structured-format.md 3.3 KB
- references/log-unbuffered-stdout.md 2.8 KB
- references/parity-deploy-frequently.md 3.0 KB
- references/parity-developers-deploy.md 2.8 KB
- references/parity-minimize-gaps.md 2.7 KB
- references/parity-same-backing-services.md 3.2 KB
- references/port-any-protocol.md 3.8 KB
- references/port-export-via-binding.md 2.3 KB
- references/port-self-contained.md 2.4 KB
- references/proc-compile-at-build.md 2.6 KB
- references/proc-no-local-filesystem.md 2.6 KB
- references/proc-no-sticky-sessions.md 2.6 KB
- references/proc-share-nothing.md 2.8 KB
- references/proc-stateless-processes.md 2.5 KB
- references/scale-horizontal-not-vertical.md 3.1 KB
- references/scale-no-daemonize.md 2.7 KB
- references/scale-process-formation.md 2.6 KB
- references/scale-process-model.md 2.7 KB
- references/scale-process-types.md 3.9 KB
- references/svc-as-attached-resources.md 2.1 KB
- references/svc-connection-strings.md 2.3 KB
- references/svc-detach-attach-without-code.md 2.3 KB
- references/svc-no-local-vs-remote.md 2.5 KB
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.
- 8d ago First seen · 141 lines · 57 tokens per session scan A 1144899200ab
12-factor-app is a skill published in the GitHub repository pproenca/dot-skills (203 stars, last pushed 23d ago), licensed MIT. It adds 57 tokens to every session and 2,039 once invoked, about $0.0003 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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