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 damionrashford/media-os --skill gstreamer-docsgit clone --depth 1 https://github.com/damionrashford/media-osWrote 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/damionrashford/media-os/gstreamer-docs)<a href="https://agentmods.dev/skills/damionrashford/media-os/gstreamer-docs"><img src="https://agentmods.dev/badge/skills/damionrashford/media-os/gstreamer-docs/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/damionrashford/media-os/gstreamer-docs"><img src="https://agentmods.dev/badge/skills/damionrashford/media-os/gstreamer-docs.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 | $0.00180 | $0.03102 |
| Opus 5 | $0.00090 | $0.01551 |
| Sonnet 5 | $0.00036 | $0.00620 |
| Haiku 4.5 | $0.00018 | $0.00310 |
Grade A, and why
gstreamer-docs scanned grade A with 1 finding 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 11d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
**Solution:** Run `gst-inspect-1.0 <name>` to confirm the element exists and see its plugin. Then `search --query "<name>"` across the whole catalog to find the right plugin page. If it's a Rust plugin not in our list ye How it starts
The opening of the file, as written. The whole thing — 246 lines — stays where its author put it; the contents beside it link to each section on GitHub.
GStreamer Docs
Context: $ARGUMENTS
Quick start
- Find an element / property / signal: -> Step 2 (
search --query <term>) - Read the full docs for one element: -> Step 3 (
element --name <name>) - Read one section by anchor: -> Step 4 (
section --page <page> --id <anchor>) - Grab a whole page: -> Step 5 (
fetch --page <name>) - Prime cache for offline use: -> Step 6 (
index)
When to use
- User asks "what does element
Xdo?" or "what properties doeswebrtcbinexpose?" - Need to verify an element name, property, pad, or signal exists before recommending it.
- Need the canonical gstreamer.freedesktop.org URL to cite in a response.
- Before writing any non-trivial gst-launch-1.0 pipeline, verify the element and its caps/properties.
- Need to know which plugin package an element ships in.
Step 1 — Know the page catalog
The script targets a fixed list of plugin-index pages + top-level guides. Get the list:
uv run ${CLAUDE_SKILL_DIR}/scripts/gstdocs.py list-pages
Common picks:
| Question | Page |
|---|---|
| "What does filesrc / queue / tee / capsfilter do?" | coreelements |
| "How do I use playbin3 / decodebin3 / uridecodebin3?" | playback |
| "RTSP client / server elements?" | rtsp, rtspserver |
| "HLS / DASH muxing / sinks?" | hls, dash |
| "WebRTC — webrtcbin (C) vs webrtcsink (Rust)?" | webrtc, rswebrtc |
| "SRT source / sink?" | srt |
| "x264enc / x265enc / VP9 options?" | x264, x265, vpx |
| "NVENC / NVDEC in GStreamer?" | nvcodec |
| "MP4 / QuickTime mux / demux?" | isomp4 |
| "Matroska / WebM mux?" | matroska |
| "V4L2 webcam?" | v4l2 |
| "OpenGL elements?" | opengl |
| "gst-launch-1.0 syntax rules?" | gst-launch |
| "gst-inspect-1.0 output fields?" | gst-inspect |
| "Core GObject API / GstElement / GstPad / GstCaps?" | gstreamer |
| "Base classes for writing elements (GstBaseSrc etc.)?" | base |
Read references/pages.md for the full catalog.
What ships with it
2 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.
- 11d ago First seen · 246 lines · 180 tokens per session scan A 823426dee373
gstreamer-docs is a skill published in the GitHub repository damionrashford/media-os (18 stars, last pushed 3mo ago), licensed MIT. It adds 180 tokens to every session and 3,102 once invoked, about $0.0009 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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