Membrane Framework
membraneframework/membrane_core
Work with the Membrane multimedia streaming framework in Elixir.
Reduce mix output noise (5-15% token savings) by installing rtk; Use when long mix output floods context.
MITAuto-check passed
Install Phx Mix Compression
$ npx skills add oliver-kriska/claude-elixir-phoenix --skill phx-mix-compression -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install oliver-kriska/claude-elixir-phoenix phx-mix-compression --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/oliver-kriska/claude-elixir-phoenix.git skills-src && mkdir -p .claude/skills && cp -r skills-src/targets/codex/skills/phx-mix-compression .claude/skills/phx-mix-compression && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "phx-mix-compression" agent skill from https://github.com/oliver-kriska/claude-elixir-phoenix/tree/main/targets/codex/skills/phx-mix-compression into .claude/skills/phx-mix-compression/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "phx-mix-compression", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/oliver-kriska/claude-elixir-phoenix/tree/main/targets/codex/skills/phx-mix-compressionType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add oliver-kriska/claude-elixir-phoenix --skill phx-mix-compression -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install oliver-kriska/claude-elixir-phoenix phx-mix-compression --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/oliver-kriska/claude-elixir-phoenix.git skills-src && mkdir -p .agents/skills && cp -r skills-src/targets/codex/skills/phx-mix-compression .agents/skills/phx-mix-compression && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "phx-mix-compression" agent skill from https://github.com/oliver-kriska/claude-elixir-phoenix/tree/main/targets/codex/skills/phx-mix-compression into .agents/skills/phx-mix-compression/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "phx-mix-compression", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add oliver-kriska/claude-elixir-phoenix --skill phx-mix-compression -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install oliver-kriska/claude-elixir-phoenix phx-mix-compression --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/oliver-kriska/claude-elixir-phoenix.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/targets/codex/skills/phx-mix-compression .cursor/skills/phx-mix-compression && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "phx-mix-compression" agent skill from https://github.com/oliver-kriska/claude-elixir-phoenix/tree/main/targets/codex/skills/phx-mix-compression into .cursor/skills/phx-mix-compression/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "phx-mix-compression", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/oliver-kriska/claude-elixir-phoenix.git --path targets/codex/skills/phx-mix-compression--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add oliver-kriska/claude-elixir-phoenix --skill phx-mix-compression -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install oliver-kriska/claude-elixir-phoenix phx-mix-compression --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/oliver-kriska/claude-elixir-phoenix.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/targets/codex/skills/phx-mix-compression .gemini/skills/phx-mix-compression && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "phx-mix-compression" agent skill from https://github.com/oliver-kriska/claude-elixir-phoenix/tree/main/targets/codex/skills/phx-mix-compression into .gemini/skills/phx-mix-compression/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "phx-mix-compression", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install oliver-kriska/claude-elixir-phoenix phx-mix-compressionInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add oliver-kriska/claude-elixir-phoenix --skill phx-mix-compression -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/oliver-kriska/claude-elixir-phoenix.git skills-src && mkdir -p .github/skills && cp -r skills-src/targets/codex/skills/phx-mix-compression .github/skills/phx-mix-compression && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "phx-mix-compression" agent skill from https://github.com/oliver-kriska/claude-elixir-phoenix/tree/main/targets/codex/skills/phx-mix-compression into .github/skills/phx-mix-compression/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "phx-mix-compression", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add oliver-kriska/claude-elixir-phoenix --skill phx-mix-compression -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install oliver-kriska/claude-elixir-phoenix phx-mix-compression --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/oliver-kriska/claude-elixir-phoenix.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/targets/codex/skills/phx-mix-compression .opencode/skills/phx-mix-compression && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "phx-mix-compression" agent skill from https://github.com/oliver-kriska/claude-elixir-phoenix/tree/main/targets/codex/skills/phx-mix-compression into .opencode/skills/phx-mix-compression/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "phx-mix-compression", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
phx-mix-compression- GitHub stars
- 565
- Token cost
- ~984 tokens
- SKILL.md length
- 445 words
- Files
- 3 (incl. references)
- Skills in repo
- 109
- Repo updated
- First seen
- Licence
- MIT
At a glance
Reduce mix output noise (5-15% token savings) by installing rtk; Use when long mix output floods context.
- Works in 4 steps: Detect rtk → Seed .rtk/filters.toml → Verify filters work → …
- Long mix output floods context
- SKILL.md covers When to use, Iron Laws, Workflow and Customization, plus 2 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Phx Mix Compression is an agent skill from oliver-kriska/claude-elixir-phoenix. Reduce mix output noise (5-15% token savings) by installing rtk; Use when long mix output floods context.
Its SKILL.md is about 980 tokens, which your agent loads only when the skill is triggered. The skill folder holds 3 other files, including reference files (for example `references/install.md`).
It works with Elixir. The repository describes itself as: Claude Code plugin for Elixir/Phoenix/LiveView — 26 specialist agents, Iron Laws enforcement, and Tidewave MCP integration. Plan features with parallel research agents, execute… The licence is MIT.
When your agent uses it
- Long mix output floods context
Example prompts
- “/phx-mix-compression”
Workflow steps
4 steps, taken from the step headings in SKILL.md.
What it can do on your machine
Read from SKILL.md and the folder at commit 9767a82. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are bash).
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
github.com
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Phx Mix Compression loads about 984 tokens when it runs, and up to ~5.8k if it reads all its reference files. Until then it costs about 31 tokens; SKILL.md has 445 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from oliver-kriska/claude-elixir-phoenix at commit 9767a82, republished under its MIT licence (© oliver-kriska). 445 words, ~984 tokens.
Download SKILL.mdSave it as
.claude/skills/phx-mix-compression/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.- name
- phx-mix-compression
- description
- Reduce mix output noise (5-15% token savings) by installing rtk; Use when long mix output floods context.
Mix Output Compression
Mix commands (mix test, mix credo, mix dialyzer, mix compile) emit
verbose, repetitive output that consumes context fast. This skill installs
rtk — a CLI proxy that filters tool output
before it lands in the transcript.
The filters short-circuit happy paths to a single line (mix test: all pass)
while preserving full failure blocks, compile errors, and stack traces. Net win:
5-15% per-session token reduction on mix-heavy workflows.
When to use
- Long sessions —
$elixir-phoenix:phx-workor$elixir-phoenix:phx-fullhitting context limits from mix output - Debugging loops —
$elixir-phoenix:phx-investigateretryingmix compile/mix testrepeatedly - Dialyzer-heavy projects —
mix dialyzeroutput dominates the transcript
Iron Laws
- NEVER strip critical signals — compile errors (
** (CompileError),== Compilation error in), test failures (FAILURES,0 failures— preserved even on short-circuit), dialyzer warnings, and stack traces withfile:lineMUST pass through unchanged - Verify after install — run
rtk verify(orrtk verify --filter mix-test) to confirm the bundled test fixtures pass before declaring success - Never overwrite existing
.rtk/filters.toml— diff and merge instead
Workflow
Step 1: Detect rtk
which rtk && rtk --versionRead references/install.md if rtk is missing — covers
homebrew install + shell hook setup.
Step 2: Seed .rtk/filters.toml
Reference filters live at references/rtk-filters.toml. Six
production-tested filters covering:
mix-test— short-circuits all-pass, preserves failure blocks + compile errorsmix-credo— collapses clean runs, preserves violation blocksmix-dialyzer— drops PLT progress, keeps warnings + summarymix-deps-get— collapses unchanged package listsmix-ecto-migrate— strips compile prefix, short-circuits "already up"mix-compile— handles parallel worker prefixes (N>) and MIX_ENV
Run this if the project has no .rtk/filters.toml yet:
mkdir -p .rtk
cp "references/rtk-filters.toml" .rtk/filters.tomlRead both files if one already exists. Present a diff to the user. Merge only the filters they don't already have.
Show full SKILL.md (179 more words)Show less
Step 3: Verify filters work
rtk verify # runs all embedded [[tests.*]] fixtures
rtk verify --filter mix-test # one filter onlyCheck that all report "passed". Flag and stop if any fail — usually means the user has a custom rtk version with regex differences.
Step 4: Confirm shell hook
Run rtk init zsh (or rtk init bash) to install the transparent rewrite hook
that turns mix X into rtk mix X. Re-running is safe (idempotent). Skip this
step and mix calls run unfiltered.
Customization
Add custom regex patterns to strip_lines_matching for project-specific noise
sources (e.g., third-party hex deps spamming stack traces). See the inline
example in references/rtk-filters.toml lines 57-59.
What this is NOT
- Not a hook — Claude Code's
PostToolUsehooks fire after the tool result is in the transcript and cannot shrink it. rtk works at the subprocess layer (the only layer where transcript-shortening is possible). - Not project-analysis — the bundled filter set is universal across Phoenix
projects. No
mix.exsinspection needed. - Not telemetry — rtk has telemetry off by default (
enabled = falseinconfig.toml). Filters run locally, no data leaves the machine.
References
references/rtk-filters.toml— bundled filter setreferences/install.md— rtk install + shell hook setup- rtk on GitHub
© oliver-kriska, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 2 other files (references) in targets/codex/skills/phx-mix-compression of oliver-kriska/claude-elixir-phoenix.
- SKILL.md
- references/install.md
- references/rtk-filters.toml
Open the folder on GitHubat commit 9767a82
Compare with similar skills
Phx Mix Compression next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Phx Mix Compression this skilloliver-kriska/claude-elixir-phoenix | 565 | — | ~984 | Automated safety check: Pass | MIT | |
| Membrane Frameworkmembraneframework/membrane_core | 1.5k | — | ~4.2k | Automated safety check: Pass | Apache-2.0 | |
| Web Ng Docker Loopcarverauto/serviceradar | 921 | — | ~737 | Automated safety check: Pass | Apache-2.0 | |
| Components Architectureoperately/operately | 578 | — | ~2.5k | Automated safety check: Pass | Custom licence | |
| Ash Frameworkpodlove/radiator | 136 | — | ~2.1k | Automated safety check: Pass | MIT | |
| Elixir Architectmaxim-ist/elixir-architect | 145 | — | ~7.6k | Automated safety check: Pass | MIT |
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Questions about Phx Mix Compression
What does Phx Mix Compression do?
Reduce mix output noise (5-15% token savings) by installing rtk; Use when long mix output floods context. Phx Mix Compression is an agent skill from oliver-kriska/claude-elixir-phoenix. Reduce mix output noise (5-15% token savings) by installing rtk; Use when long mix output floods context.
When should I use Phx Mix Compression?
Phx Mix Compression fits situations like: long mix output floods context.
How do I install Phx Mix Compression in Claude Code?
Run `npx skills add oliver-kriska/claude-elixir-phoenix --skill phx-mix-compression -a claude-code`. Or copy the skill folder (targets/codex/skills/phx-mix-compression in oliver-kriska/claude-elixir-phoenix) into .claude/skills/phx-mix-compression in your project. Claude Code loads it when a task matches its description.
How do I install Phx Mix Compression in Codex?
Run `npx skills add oliver-kriska/claude-elixir-phoenix --skill phx-mix-compression -a codex`. Or copy the skill folder (targets/codex/skills/phx-mix-compression in oliver-kriska/claude-elixir-phoenix) into .agents/skills/phx-mix-compression in your project. Codex loads it when a task matches its description.
Can I use Phx Mix Compression in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add oliver-kriska/claude-elixir-phoenix --skill phx-mix-compression -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/phx-mix-compression, .gemini/skills/phx-mix-compression, .github/skills/phx-mix-compression and .opencode/skills/phx-mix-compression in your project.
What does Phx Mix Compression need to run?
SKILL.md names no scripts, command-line tools or credentials: Phx Mix Compression is instructions for the agent only.
Does Phx Mix Compression access the network?
SKILL.md names 1 domain. As links in the text: github.com. This is read from the text; nothing was executed.
Is Phx Mix Compression safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Phx Mix Compression use?
Phx Mix Compression is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Phx Mix Compression use?
About 984 tokens (SKILL.md is roughly 3.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 4.8k tokens, read only when the agent opens those files.
What are the alternatives to Phx Mix Compression?
Skills that share tags, products or a category with Phx Mix Compression: Membrane Framework (membraneframework/membrane_core, 1.5k stars), Web Ng Docker Loop (carverauto/serviceradar, 921 stars), Components Architecture (operately/operately, 578 stars) and Ash Framework (podlove/radiator, 136 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Phx Mix Compression?
oliver-kriska (a GitHub user) maintains it in oliver-kriska/claude-elixir-phoenix, which has 565 GitHub stars. The repository holds 109 skills in this directory. The repository was last updated on October 5, 2026.
Source: oliver-kriska/claude-elixir-phoenix on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.