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 MacareuxDigital/concretecms-skills --skill building-packagesgit clone --depth 1 https://github.com/MacareuxDigital/concretecms-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/macareuxdigital/concretecms-skills/building-packages)<a href="https://agentmods.dev/skills/macareuxdigital/concretecms-skills/building-packages"><img src="https://agentmods.dev/badge/skills/macareuxdigital/concretecms-skills/building-packages/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/macareuxdigital/concretecms-skills/building-packages"><img src="https://agentmods.dev/badge/skills/macareuxdigital/concretecms-skills/building-packages.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00028 | $0.00499 |
| Opus 5 | $0.00014 | $0.00249 |
| Sonnet 5 | $0.00006 | $0.00100 |
| Haiku 4.5 | $0.00003 | $0.00050 |
Grade A, and why
building-packages 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.
What it actually says
Building Packages
Concrete CMS packages are modular components that extend the functionality of the platform. This skill is essential for developers who want to create custom functionality or integrate third-party services into their Concrete CMS projects.
Basic Workflow for Package Development
Follow these steps to develop a custom package in Concrete CMS:
- Initialize the Package Directory:
Create a new directory under
packages/with a lowercase, underscore-separated name (e.g.,packages/my_custom_package). - Create the Package Controller:
Create a
controller.phpfile in the package root. Define the package handle, version, and basic information. - Implement Installation Logic:
In the
install()method of your controller, add code to register block types, themes, single pages, or other entities. - Add Custom Functionality:
- Extend Core Classes: Extending Core Classes Reference
- Custom Block Types: Use the
building-blocktypesskill. - Single Pages: Use the
building-singlepagesskill. - Routes and Services: Routing and Service Providers Reference
- Install the Package:
Use the Concrete CMS Dashboard or CLI (
concrete/bin/concrete c5:package:install my_custom_package) to install your package. - Update and Refine:
When making changes to the package structure (like adding a new block type), update the
$pkgVersionincontroller.php, implement theupgrade()method, and run the update from the Dashboard or CLI (concrete/bin/concrete c5:package:update my_custom_package).
Reference Documentation
What ships with it
5 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 · 38 lines · 28 tokens per session scan A 28a0d5969921
building-packages is a skill published in the GitHub repository MacareuxDigital/concretecms-skills (9 stars, last pushed 3mo ago), licensed MIT. It adds 28 tokens to every session and 499 once invoked, about $0.0001 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 2026-08-31.
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