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 oliver-kriska/claude-elixir-phoenix --skill phx-introgit clone --depth 1 https://github.com/oliver-kriska/claude-elixir-phoenixWrote 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/oliver-kriska/claude-elixir-phoenix/phx-intro)<a href="https://agentmods.dev/skills/oliver-kriska/claude-elixir-phoenix/phx-intro"><img src="https://agentmods.dev/badge/skills/oliver-kriska/claude-elixir-phoenix/phx-intro/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/oliver-kriska/claude-elixir-phoenix/phx-intro"><img src="https://agentmods.dev/badge/skills/oliver-kriska/claude-elixir-phoenix/phx-intro.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 | $0.00047 | $0.00560 |
| Opus 5 | $0.00023 | $0.00280 |
| Sonnet 5 | $0.00009 | $0.00112 |
| Haiku 4.5 | $0.00005 | $0.00056 |
Grade A, and why
phx-intro 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 6d 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
94% identical to intro — 14 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 — 66 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Plugin Introduction Tutorial
Interactive walkthrough of the Elixir/Phoenix plugin in 6 sections (~5 min).
Arguments
$ARGUMENTSmay contain--section Nto jump to a specific section (1-6)- No arguments = start from Section 1
Execution Flow
- Read
references/tutorial-content.mdfor all section content - Parse
$ARGUMENTSfor--section Nflag (1-6) - If
--section Nspecified, jump directly to that section - Otherwise start from Section 1
Section Presentation Loop
For each section:
- Present the section content completely — do NOT abbreviate or summarize. Every paragraph, table, and code block in the reference file must appear in output
— as visible response text emitted BEFORE the
AskUserQuestioncall; content composed only in thinking is invisible to the user - After presenting, use
AskUserQuestionwith options:- If sections remain: "Next: [next section title]", "Skip to Cheat Sheet", "Stop here"
- If on final section (6): no question needed, end with closing message
Section Titles
| N | Title |
|---|---|
| 1 | Welcome |
| 2 | Core Workflow Commands |
| 3 | Knowledge & Safety Net |
| 4 | Hooks & Behavioral Rules |
| 5 | Init, Review & Gaps |
| 6 | Cheat Sheet & Next Steps |
Iron Laws
- ONE section at a time — never dump all content at once
- User controls pace — always offer to stop between sections
- Clean formatting — use tables and code blocks, not walls of text
- NEVER skip the user's questions — tutorial is interactive, not a monologue; if the user asks a question mid-section, answer it before continuing
Closing Message
After Section 6 (or when user stops):
You're all set! Try `phx-plan` with your next feature to see the workflow in action.
Run `phx-intro --section N` anytime to revisit a specific section.
Notes
- This runs in main conversation context (not a subagent)
- Reference file is readable since skill runs in user's session
- Keep tone welcoming but concise — developers don't want fluff
What ships with it
1 file 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.
- 6d ago First seen · 66 lines · 47 tokens per session scan A b6795286cc89
phx-intro is a skill published in the GitHub repository oliver-kriska/claude-elixir-phoenix (542 stars, last pushed 4d ago), licensed MIT. It adds 47 tokens to every session and 560 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 94% identical to intro, differing in 14 lines, and is treated as a copy.
Other skills, from other repositories
craftcms
Craft CMS 5 plugin and module development — extending Craft with PHP. Covers elements, element queries, services, models, records, controllers, migrations, queue jobs, console commands, field types, native fields, events, behaviors, Twig extensions, widgets, filesystems, permissions, project config, GraphQL, testing…
craft-php-guidelines
Craft CMS 5 PHP coding standards and conventions. ALWAYS load when writing, editing, reviewing, or discussing any PHP in a Craft plugin or module — even small edits. Also when running ECS, PHPStan, or scaffolding with ddev craft make. Covers: PHPDoc blocks (@author, @since, @throws chains), section headers…
craft-pest
Testing Craft CMS 5 plugins and modules with Pest — test isolation, database safety, and the markhuot/craft-pest-core harness. ALWAYS load when writing, running, fixing, or reviewing tests for a Craft plugin or module, and whenever a suite touches a real Craft install. Covers why rollback is opt-in, tests/Pest.php +…
milp-modeling-gurobi
When the user wants to build, solve, and debug mixed-integer linear programs in Python with Gurobi — creating variables, writing constraint-builder functions, setting objectives and parameters, handling solver status, and extracting solutions safely. Also use when the user mentions "gurobipy," "build a MIP model,"…
numpy-vectorization-for-optimization
When the user wants to remove slow Python loops from metaheuristic or optimization code using NumPy — population-level operations, batch fitness evaluation, distance matrices, broadcasting, argsort/argpartition idioms, defaultrng, and memory layout. Also use when the user mentions "vectorize," "numpy broadcasting,"…
teach
Teach the user a new skill or concept, within this workspace.