Membrane Framework Agent Skill

Work with the Membrane multimedia streaming framework in Elixir.

Context cost
4.2k tokensestimated from the bundle, loaded when it triggers
Bundle
1 file · 16.8 kBtext throughout, nothing executable
Licence
Apache-2.0the author’s own terms
Last change
—no release on file
Servers it uses
Noneruns standalone

What it does

Work with the Membrane multimedia streaming framework in Elixir. Use this skill whenever the user is building or debugging Membrane pipelines, writing custom Elements, Bins, or Filters, connecting pads, implementing callbacks, handling stream formats or EOS, or asking about Membrane architecture. Trigger on any mention of membrane_core, membrane, membrane framework, Membrane.Pipeline, Membrane.Sink, Membrane.Source, Membrane.Filter, Membrane.Endpoint, Membrane.Bin, Membrane.Pad, or multimedia streaming in an Elixir context — even if the user doesn't say "Membrane" explicitly but is clearly…

What this skill changes about the agent has not been set out here as a list. Its SKILL.md, shown below, says it in the author’s own words.

The skill itself

A skill is instructions the model reads, so you can see what you are getting: below is the start of its SKILL.md. The front matter loads with every session, the body loads when the skill triggers, and the whole file comes with the install.

SKILL.md16.8 kB · preview
--- name: membrane-framework globs: ["**/*.ex", "**/*.exs"] alwaysApply: false ---
8# Membrane Framework
9
10**Package**: membrane_core ~> 1.3 | **Docs**: https://hexdocs.pm/membrane_core/ | **Module index**: https://hexdocs.pm/membrane_core/llms.txt | **Demos**: https://github.com/membraneframework/membrane_demo | **All packages**: [packages_list.md](../../guides/llms/packages_list.md)
11
12## How to Approach Tasks
13
14- **New component** — before writing a new element, check [packages_list.md](../../guides/llms/packages_list.md) to see if it already exists in an existing plugin; if not, identify subtype (Source/Filter/Sink/Endpoint/Bin), define pads, implement required callbacks (handle_buffer/4 for filters/sinks, handle_demand/5 for manual-flow sources)
15- **Generating boilerplate** — use mix membrane.gen.filter MyApp.MyFilter, mix membrane.gen.source, mix membrane.gen.sink, mix membrane.gen.endpoint, mix membrane.gen.bin, mix membrane.gen.pipeline instead of writing component skeletons by hand
16- **Choosing element subtype** — prefer Filter for transformations (has sensible defaults for stream_format forwarding); use Endpoint only when output is unrelated to input (e.g. a UDP Endpoint); use Source/Sink for pure producers/consumers
17- **Flow control** — default to :auto on all pads; only use :manual when you need fine-grained backpressure control; Almost the only use case of :push are output pads of Sources/Endpoints that cannot control when they produce data, e.g. UDP Source/Endpoint.
18- **Pipeline topology** — use the ChildrenSpec DSL (child/2, get_child/1, via_in/2, via_out/2) (more info: [Membrane.ChildrenSpec](https://hexdocs.pm/membrane_core/Membrane.ChildrenSpec.md))
19- **Static vs dynamic topology** — return spec: from handle_init/2 for static pipelines; return additional spec: actions from any callback (e.g. handle_child_notification/4) to grow the topology at runtime
20- **Naming children** — use atoms (:source) for singletons, tuples ({:decoder, track_id}) for multi-instance children of the same type
21- **Detecting pipeline completion** — implement handle_element_end_of_stream/4 in the pipeline to know when a sink's input pad received EOS; then return {[terminate: :normal], state} (doesn't work if sink is a Membrane.Bin - then expect a custom message from the bin in handle_child_notification callback instead, if the bin sends it)
22- **Dynamic tracks** (demuxers, variable inputs) — use the Dynamic Pads Pattern below
23- **Crash isolation** — group children with {spec, group: <name>, crash_group_mode: :temporary}; handle recovery in handle_crash_group_down/3; see [Crash Groups guide](https://hexdocs.pm/membrane_core/crash_groups.md)
24- **Inserting debug probes** — add child(:probe, %Membrane.Debug.Filter{handle_buffer: &IO.inspect(&1, label: :buffer)}) between any two elements to log buffers without changing pipeline logic. You can use different logging functions than IO.inspect/2. More info: [Membrane.Debug.Filter](https://hexdocs.pm/membrane_core/Membrane.Debug.Filter.md).
25- **Linking children** - linked children pads accepted formats must have non-empty intersections
26- **Debugging** — check pad accepted_format compatibility
This is a preview of SKILL.md. Download or install the skill to get the whole thing.
In the file
SKILL.md1,808 words
Files1
LicenceApache-2.0
Why you can read it

Nothing in a skill executes. The client loads the text and the model follows it, so a skill can be audited the way a runbook is — by reading it.

What it costs in context

Skills are not billed by the call. They are paid for in context: every token the instructions occupy is a token your code, your diff and your conversation cannot use. Here is what this one takes and when it takes it.

≈180
always loaded
The name and description, so the model knows the skill exists and when to reach for it.
4,020
on trigger
The instruction body, read only when the skill fires.
2.1%
of a 200k window
Ten skills this size would take about 21% of the window before you open a file.
050k100k150k200k context window

4.2k tokens, estimated from the bundle at four bytes to the token, held for the rest of the session once it triggers. Heavy. Teams tend to install this one per project rather than globally, and load it only when the job comes up.

Servers bill, skills cost

A server charges by the month. A skill charges once per session, in context, and then keeps charging it for as long as the session lives.

Before and after

The same question, put to the same model twice: once as it comes, and once with these instructions loaded.

No worked example has been published for this skill yet.

The procedure it runs

The procedure has not been set out here step by step. It is in the body of its SKILL.md: the start of it is shown above, and the whole file comes with the install.

Prose, not code

These steps are written for a model to follow, not executed by a runtime. It can still be told to skip one, and it will say so when it does.

Servers it uses

None. This skill calls no MCP servers at all.

Everything it needs is in the instructions, so it works in a project with nothing connected — the model reads the file and changes how it works with what it can already reach.

Its SKILL.md does not declare which tools it asks the agent for, so what it touches is whatever the instructions themselves ask for — read them before you install it.

What it asks for
Writes filesnot declared
Network accessnot declared

This SKILL.md carries no allowed-tools line, so neither is declared. A skill grants no permissions of its own — it can only ask for tools your client already has.

What it will not do

Every skill is narrow, and the useful ones say where they stop. These are the jobs this one is the wrong tool for.

What this skill is not for has not been published here. Nothing is implied by that: it is a section the author has not filled in.

What is in the bundle

1 file, 16.8 kB on disk. A bundle is text throughout: the instructions the model reads, plus the templates it fills in.

  • SKILL.md16.8 kB
What is not in it

No dependencies and nothing executable: a skill is text the agent reads, so the bundle is 1 file you can review in full before installing. The Apache-2.0 licence covers the templates and examples as well as the instructions.

Install

Installing copies the bundle into your project. Nothing runs at install time — the files sit on disk until the model reads them.

# Membrane Framework · 4.2k tokens when loaded · macOS, Linux mkdir -p .claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/membrane-framework/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/membrane-framework" ] && { [ ! -e .claude/skills/membrane-framework ] || { mv .claude/skills/membrane-framework "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/membrane-framework" .claude/skills/ && echo "Installed .claude/skills/membrane-framework"
On Windows, or any OS with Node 20+
npx mcprush@latest skill add membraneframework/membrane-framework

Windows PowerShell says 'running scripts is disabled on this system'? Run Set-ExecutionPolicy -Scope CurrentUser RemoteSigned once, or type npx.cmd instead of npx (codex.cmd, gemini.cmd, grok.cmd likewise). PowerShell 7 needs neither. Writes to .claude/skills/membrane-framework/ in the current project. For every project instead, run mkdir -p ~/.claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/membrane-framework/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/membrane-framework" ] && { [ ! -e ~/.claude/skills/membrane-framework ] || { mv ~/.claude/skills/membrane-framework "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/membrane-framework" ~/.claude/skills/ && echo "Installed ~/.claude/skills/membrane-framework" (macOS, Linux) — or add --global to the npx line. The curl line replaces .claude/skills/membrane-framework/ only after the download succeeds, so files left there by another skill of the same name, or by an older release, do not mix in. A copy already there is moved aside, not deleted, and the line prints where.

Which clients pick it up on their own

A skill is a folder of text. Most of these read a skills folder and pick it up without being told; the rest take the same folder another way — an upload in the app, a parameter on an API call — and then choose it by its description just the same.

Claude Code.claude/skills/
Claude DesktopCustomize › Skills
ChatGPTSkills › Create › Upload
Cursor.cursor/skills/
VS Code.github/skills/
Codex CLI.agents/skills/
Gemini CLI.gemini/skills/
Grok Build.grok/skills/
Microsoft CopilotSkills › Upload a skill
PerplexityComputer › Skills › Upload a skill
DeepSeek Harness.dsh/skills/
Zed.agents/skills/
Devin Desktop.devin/skills/
Windsurf (legacy).windsurf/skills/
OpenAI Agents SDKInstructions or sandbox Skills
HTTP / APIa request parameter
This release
Versionnot versioned
Publishedno release date on file
PriceFree
Referencemembraneframework/membrane-framework

Versions

Its author publishes no version number, so there is nothing here to pin to: what you install is the folder as it stands today. Instructions change more often than APIs do — a skill can be rewritten entirely without anything it depends on moving.

Pinning

Nothing to pin to: this skill carries no version number of its own. What you install is what the folder holds on the day you install it.

Reviews

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Anybody with an account, one review each. It carries the version that was current when you wrote it, and the publisher may reply once.

Who wrote it

ME
membraneframework

Publishes on mcprush.

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