phact

Publishes apps you've built locally as peer-to-peer URLs that anyone with the link can open in a browser. Use when the user wants to share a working app — built or running on this machine — with someone else (or use it on their phone) without deploying to a cloud, signing up for a service, or opening a port through their router.

Use this skill when an agent-team session has lost runtime team context — typically after a tmux server crash, a `claude --resume` of the team lead, or any state where SendMessage to teammates fails with "No agent named 'X' is currently addressable. Spawn a new one or use the agent ID." Restores warm-context teammates by `claude --resume`-ing each member's saved session jsonl with the right flags + env, AND rehydrates the team lead's appState.teamContext, AND places the resumed workers into the lead's tmux window in a lead-left/workers-right layout. Triggers on: "restore the team", "rehydrate team", "tmux died bring agents back", "agents lost", "swarm died", "resume my team".

Use when the user wants to understand how a Rust or Python program actually executed — onboarding into an unfamiliar flow, verifying AI-written code, answering "why did this run do X / take this branch / return this value", or understanding a failing test. Cairn records a REAL run and serves recorded ground truth at three zoom levels. Trigger on: "trace this", "why did <function> return/branch/do X", "walk me through what actually happened", "what was <variable> at runtime", "help me understand this flow/handler/test", "why did this test fail". Do NOT use for static questions answerable by reading source alone, or for languages other than Rust and Python (v0).