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-compoundgit 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-compound)<a href="https://agentmods.dev/skills/oliver-kriska/claude-elixir-phoenix/phx-compound"><img src="https://agentmods.dev/badge/skills/oliver-kriska/claude-elixir-phoenix/phx-compound/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-compound"><img src="https://agentmods.dev/badge/skills/oliver-kriska/claude-elixir-phoenix/phx-compound.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 | $0.00035 | $0.00896 |
| Opus 5 | $0.00017 | $0.00448 |
| Sonnet 5 | $0.00007 | $0.00179 |
| Haiku 4.5 | $0.00003 | $0.00090 |
Grade A, and why
phx-compound 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
88% identical to compound — 33 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 — 110 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Compound — Capture Solutions as Knowledge
After fixing a problem, capture the solution as searchable institutional documentation.
Usage
phx-compound Fixed N+1 query in user listing
phx-compound Resolved LiveView timeout in dashboard
phx-compound # Auto-detects from recent session context
Philosophy
Each unit of engineering work should make subsequent units easier — not harder.
Workflow
Step 1: Detect Context
- If
$ARGUMENTSprovided, use as description - If no args, check scratchpad DEAD-END/DECISION entries,
git diff,.claude/plans/{slug}/progress.mdfor recent completions - If unclear, ask: "What problem did you just solve?"
Only document non-trivial problems that required investigation.
Step 2: Search Existing Solutions
Create .claude/solutions/ directory if it doesn't exist (run mkdir -p .claude/solutions).
Then search .claude/solutions/ for relevant keywords using Grep.
If found: Create new (different root cause), Update existing (same root cause, new symptom), or Skip.
Step 3: Gather Details and Create Solution
Extract from session context: module, symptoms, investigation steps, root cause, solution code, and prevention advice.
Validate frontmatter against ../compound-docs/references/schema.md,
then create file using ../compound-docs/references/resolution-template.md.
Write-blocked fallback: if writing to .claude/solutions/ is denied
by permissions, do NOT silently drop the solution. Output the full
solution doc inline (fenced markdown the user can paste), then suggest
phx-permissions to allow .claude/solutions/ writes for next time.
Step 4: Decision Menu
- Continue (default)
- Promote to Iron Law check — Add to iron-law-judge
- Update skill reference — Add to relevant skill
- Update CLAUDE.md — Add prevention rule
Auto-Trigger Phrases
When user says "that worked", "it's fixed", "problem solved",
"the fix was" — suggest phx-compound.
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 · 110 lines · 35 tokens per session scan A d10d6506ff1c
phx-compound is a skill published in the GitHub repository oliver-kriska/claude-elixir-phoenix (542 stars, last pushed 4d ago), licensed MIT. It adds 35 tokens to every session and 896 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 88% identical to compound, differing in 33 lines, and is treated as a copy.
Other skills, from other repositories
setup
Use when superb's skills need their dependencies installed or checked — "set up superb", "install the dependencies", "why does pipeline say superpowers is missing", after a fresh plugin install, or on a new machine. Also use when a skill fails complaining that a superpowers sub-skill cannot be found.
bird-bookmark-folders
A skill for organising X, formerly called Twitter, bookmark folders, also known as collections.
handoff
A workflow for creating a concise handoff document for another coding agent, computer, or new session. It can store temporary handoffs or persistent task notes in Obsidian, with large files kept separately in iCloud AgentArtifacts.
disk-space-analyzer
Analyze disk space and find cleanable files. Use when user wants to clean disk, free up space, find large files, analyze disk usage, or asks about what's taking up space. Triggers on requests like "clean my disk", "free up space on C:", "find large files", "what's using my disk space", "disk cleanup".
handoff
Compact the current conversation into a handoff document for another agent to pick up.
zoom-out
Tell the agent to zoom out and give broader context or a higher-level perspective. Use when you're unfamiliar with a section of code or need to understand how it fits into the bigger picture.