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-documentgit 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-document)<a href="https://agentmods.dev/skills/oliver-kriska/claude-elixir-phoenix/phx-document"><img src="https://agentmods.dev/badge/skills/oliver-kriska/claude-elixir-phoenix/phx-document/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-document"><img src="https://agentmods.dev/badge/skills/oliver-kriska/claude-elixir-phoenix/phx-document.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 | $0.00050 | $0.00693 |
| Opus 5.5 | $0.00020 | $0.00277 |
| Sonnet 5.5 | $0.00010 | $0.00139 |
| Haiku 4.5 | $0.00005 | $0.00069 |
Grade A, and why
phx-document 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 24d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- elixir-phoenix-document — 89% identical, 25 lines differ
How it starts
The opening of the file, as written. The whole thing — 79 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Document
Generate documentation for newly implemented features.
Usage
phx-document .claude/plans/magic-link-auth/plan.md
phx-document magic link authentication
phx-document # Auto-detect from recent plan
Iron Laws
- Never remove existing documentation — Existing docs may reflect design intent that isn't obvious from code alone; update rather than replace
- @moduledoc on every public module — Undocumented modules accumulate quickly and create onboarding friction for new team members
- ADRs capture the "why", not the "what" — Code shows what was built; ADRs explain why this approach was chosen over alternatives
- Match @doc to function's public API — Document parameters, return values, and edge cases; callers shouldn't need to read the implementation
- DO NOT add @doc to untested code — documentation implies a stable contract; document only after tests confirm the function behaves as described
What Gets Documented
| Output | Description |
|---|---|
@moduledoc |
For new modules missing documentation |
@doc |
For public functions without docs |
| README section | For user-facing features |
| ADR | For significant architectural decisions |
Workflow
Step 0: Pre-check (avoid no-op runs)
Run git diff --name-only HEAD~5 | grep '\.ex$' | head -20 to check for new .ex files.
If no new .ex files were added (only modifications), skip the full
audit and report: "No new modules — documentation coverage unchanged."
A full audit of unchanged coverage produces nothing to add.
- Identify new modules from recent commits or plan file
- Check documentation coverage (
@moduledoc,@doc) - Generate missing docs using templates
- Add README section if user-facing feature
- Create ADR if architectural decision was made
- Write report to
.claude/plans/{slug}/reviews/{feature}-docs.md
When to Generate ADRs
| Trigger | Create ADR |
|---|---|
| New external dependency | Yes |
| New database table | Maybe (if schema non-obvious) |
| New OTP process | Yes (explain why process needed) |
| New context | Maybe (if boundaries non-obvious) |
| New auth mechanism | Yes |
| Performance optimization | Yes |
What ships with it
4 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.
- 24d ago Changed · -1 lines · +9 tokens per session 58ada92de12c
- 1mo ago First seen · 80 lines · 41 tokens per session scan A cde19370152a
phx-document is a skill published in the GitHub repository oliver-kriska/claude-elixir-phoenix (569 stars, last pushed 2d ago), licensed MIT. It adds 50 tokens to every session and 693 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-09-03.
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