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 personamanagmentlayer/pcl --skill webrtc-expertgit clone --depth 1 https://github.com/personamanagmentlayer/pclWrote 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/personamanagmentlayer/pcl/webrtc-expert)<a href="https://agentmods.dev/skills/personamanagmentlayer/pcl/webrtc-expert"><img src="https://agentmods.dev/badge/skills/personamanagmentlayer/pcl/webrtc-expert/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/personamanagmentlayer/pcl/webrtc-expert"><img src="https://agentmods.dev/badge/skills/personamanagmentlayer/pcl/webrtc-expert.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 | $0.00078 | $0.01095 |
| Opus 5 | $0.00039 | $0.00548 |
| Sonnet 5 | $0.00016 | $0.00219 |
| Haiku 4.5 | $0.00008 | $0.00110 |
Grade A, and why
webrtc-expert 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 5d 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.
How it starts
The opening of the file, as written. The whole thing — 169 lines — stays where its author put it; the contents beside it link to each section on GitHub.
WebRTC Expert
Core Concepts
WebRTC Architecture
- Peer Connection - Direct P2P connection
- Media Streams - Audio/video tracks
- Data Channels - Arbitrary data transfer
- Signaling - Exchange connection info
- ICE - Interactive Connectivity Establishment
- STUN/TURN - NAT traversal servers
Key Components
- getUserMedia - Access camera/microphone
- RTCPeerConnection - Peer-to-peer connection
- RTCDataChannel - Data communication
- MediaRecorder - Record media streams
- Screen Sharing - Capture screen content
- Simulcast - Multiple quality streams
Protocols & Standards
- SDP - Session Description Protocol
- Candidate Exchange - ICE candidates
- DTLS/SRTP - Secure communication
- Janus/Mediasoup - Media servers
- Socket.IO/WebSockets - Signaling layer
- ORTC - Object RTC (alternative API)
Best Practices
Connection Establishment
- Always use STUN/TURN servers
- Implement proper signaling
- Handle connection failures
- Monitor connection quality
- Implement reconnection logic
- Test across different networks
Media Handling
- Request appropriate constraints
- Handle permission denials
- Implement adaptive bitrate
- Monitor bandwidth usage
- Support screen sharing
- Handle device changes
Security
- Use HTTPS for signaling
- Validate all signaling messages
- Implement authentication
- Encrypt data channels
- Use SRTP for media
- Sanitize user input
Performance
- Use simulcast for groups
- Implement bandwidth adaptation
- Monitor CPU usage
- Optimize video resolution
- Use hardware acceleration
- Implement graceful degradation
Anti-Patterns
Common Mistakes
- No TURN server fallback
- Ignoring ICE failures
- Missing error handling
- Hard-coded ICE servers
- Not closing connections properly
- Missing permission checks
Connection Issues
- Synchronous signaling
- No reconnection strategy
- Ignoring network changes
- Missing ICE restart
- Poor error messages
- No connection timeout
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.
- 5d ago First seen · 169 lines · 78 tokens per session scan A 412bdb5dc4fc
webrtc-expert is a skill published in the GitHub repository personamanagmentlayer/pcl (40 stars, last pushed 3d ago), licensed Apache-2.0. It adds 78 tokens to every session and 1,095 once invoked, about $0.0004 per session on Opus 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 2026-09-05.
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