competition-websocket-runtime

competition-websocket-runtime is a skill for Codex from Saprophytic-seattle561/reverse-skill. It costs 114 tokens per session (606 once invoked), scanned A, a copy of competition-websocket-runtime, MIT.

A specialized workflow for capture-the-flag security challenges involving WebSocket or SSE connections, which carry live messages between a browser and server. It follows connection setup, authentication, subscriptions, messages, reconnects, and resulting state changes.

In plain words
What is it for?
Use it to inspect handshakes, decode frames, follow channels and message formats, analyze reconnect behavior, and reproduce the smallest message sequence that causes a visible or backend change.
Why use it?
It helps when the important behavior is spread across a sequence of live messages instead of a single web request. It keeps the connection details and their effects in one trace.

Skill for Codex

Written for Codex: agents/openai.yaml present. Also seen: $skill-name invocation.

Install

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.

agentmods
npx agentmods add skills/saprophytic-seattle561/reverse-skill/competition-websocket-runtime
Any agent
npx skills add Saprophytic-seattle561/reverse-skill --skill competition-websocket-runtime
Clone the repo
git clone --depth 1 https://github.com/Saprophytic-seattle561/reverse-skill

Made for: Codex.

Wrote 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.

agentmods badge for competition-websocket-runtime

README.md
[![agentmods](https://agentmods.dev/badge/skills/saprophytic-seattle561/reverse-skill/competition-websocket-runtime.svg)](https://agentmods.dev/skills/saprophytic-seattle561/reverse-skill/competition-websocket-runtime)
Your own site
<a href="https://agentmods.dev/skills/saprophytic-seattle561/reverse-skill/competition-websocket-runtime"><img src="https://agentmods.dev/badge/skills/saprophytic-seattle561/reverse-skill/competition-websocket-runtime.svg" alt="Measured on agentmods" height="20"></a>
Per session 114 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 606 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 100% copy Near-identical to another mod in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00114 $0.00606
Opus 5 $0.00057 $0.00303
Sonnet 5 $0.00023 $0.00121
Haiku 4.5 $0.00011 $0.00061

Measured 5d ago against content hash 8237cae908ea, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

competition-websocket-runtime 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.

Origin

This is a copy

100% identical to competition-websocket-runtime — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

CTF-Sandbox-Orchestrator/competition-websocket-runtime/SKILL.md · 51 lines

How it starts

The opening of the file, as written. The whole thing — 51 lines — stays where its author put it; the contents beside it link to each section on GitHub.

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.

Reply in Simplified Chinese unless the user explicitly requests English.

Quick Start

  1. Map the handshake first: origin, path, headers, cookies, query, auth token, and upgrade response.
  2. Separate connection setup, subscription messages, keepalives, server pushes, and reconnect logic.
  3. Record message schema, topic or channel identity, and state side effects in one chain.
  4. Tie frames to rendered, stored, or backend-visible effects.
  5. 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 the full file on GitHub · 51 lines

Files

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.

Changes

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.

  1. 5d ago First seen · 51 lines · 114 tokens per session scan A 8237cae908ea

Subscribe to this mod's changes

competition-websocket-runtime is a skill published in the GitHub repository Saprophytic-seattle561/reverse-skill (1 stars, last pushed 2d ago), licensed MIT. It adds 114 tokens to every session and 606 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to competition-websocket-runtime, differing in 0 lines, and is treated as a copy.

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