Competition WebSocket Runtime
Use this skill only as a downstream specialization after $ctf-sandbox-orchestrator is already active and has established sandbox assumptions, node ownership, and evidence priorities. If that has not happened yet, return to $ctf-sandbox-orchestrator first.
Use this skill when the decisive behavior is carried by realtime handshake and frame flow rather than one-shot HTTP alone.
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Quick Start
- Map the handshake first: origin, path, headers, cookies, query, auth token, and upgrade response.
- Separate connection setup, subscription messages, keepalives, server pushes, and reconnect logic.
- Record message schema, topic or channel identity, and state side effects in one chain.
- Tie frames to rendered, stored, or backend-visible effects.
- Reproduce the smallest handshake-plus-frame sequence that reaches the decisive state change.
Workflow
1. Map The Realtime Handshake
- Record the initial HTTP or SSE request, upgrade headers, cookies, tokens, query params, origin checks, and negotiated protocol.
- Note whether auth material is carried by headers, cookies, query strings, or initial application frames.
- Keep route, subscription endpoint, and session identity tied together.
2. Decode Message Flow
- Separate subscribe, unsubscribe, ack, heartbeat, server push, reconnect, and terminal frames.
- Recover message types, channel IDs, schema fields, and sequencing that matter to behavior.
- Distinguish transport keepalive from application-level business messages.
3. Reduce To The Decisive Realtime Path
- Compress the result to the smallest sequence: handshake -> auth or subscribe frame -> pushed or accepted frame -> resulting state change.
- Keep canonical frame order and any replayed minimal order side by side.
- If the hard part is generic protocol reassembly without runtime UI or app-state linkage, switch back to the tighter protocol skill.
Read This Reference
- Load
references/websocket-runtime.md for the handshake checklist, frame checklist, and evidence packaging.
What To Preserve
- Handshake headers, cookies, query params, auth material, negotiated subprotocol, and channel IDs
- Frame schemas, subscription messages, server pushes, reconnect flow, and resulting state changes
- The smallest replayable realtime sequence that proves the decisive branch
