find-CSteam3ServerS1_InitGameServer-decompiles

find-CSteam3ServerS1_InitGameServer-decompiles is a skill for Claude Code from HLND2T/CS2_VibeSignatures. It costs 139 tokens per session (1,648 once invoked), scanned A, original, MIT.

A fallback reverse-engineering procedure for recovering two network-related virtual calls from Counter-Strike 2 binaries. It uses IDA Pro, a program for inspecting compiled software, to decompile and trace the server initialization code.

In plain words
What is it for?
Finding the UDP port calls and in-game server-state call used during CS2 server initialization on Windows or Linux builds.
Why use it?
It provides a last resort when the normal preprocessor cannot recover the needed call locations. It also warns that reference addresses must be checked against the current binary.

Skill for Claude Code

Written for Claude Code: disable-model-invocation in frontmatter.

Good fit Finding the UDP port calls and in-game server-state call used during CS2 server initialization on Windows or Linux builds.

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Install with agentmods
npx agentmods add skills/hlnd2t/cs2_vibesignatures/find-csteam3servers1_initgameserver-decompiles
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.

Any agent
npx skills add HLND2T/CS2_VibeSignatures --skill find-csteam3servers1_initgameserver-decompiles
Clone the repo
git clone --depth 1 https://github.com/HLND2T/CS2_VibeSignatures

Made for: Claude Code.

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README.md
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Per session 139 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,648 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found 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 $0.00139 $0.01648
Opus 5.5 $0.00056 $0.00659
Sonnet 5.5 $0.00028 $0.00330
Haiku 4.5 $0.00014 $0.00165

Measured 15d ago against content hash 3744ff3a4a03, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

find-CSteam3ServerS1_InitGameServer-decompiles 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 15d 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.

.claude/skills/find-CSteam3ServerS1_InitGameServer-decompiles/SKILL.md · 122 lines

How it starts

The opening of the file, as written. The whole thing — 122 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Find InitGameServer network interface calls (final-guarantee fallback)

Recover every output of find-CSteam3ServerS1_InitGameServer-decompiles in CS2 engine2.dll / libengine2.so using IDA Pro MCP. This Agent fallback runs only after the preprocessor fails, so it must produce any missing output itself while preserving outputs that a partial preprocessor run already wrote.

Realworld Function References

Read the platform-relevant reference YAML before searching in IDA. Its addresses, offsets, and signatures are reference-build values only; verify every result against the current binary.

  • ida_preprocessor_scripts/references/engine/CSteam3ServerS1_InitGameServer.windows.yaml
  • ida_preprocessor_scripts/references/engine/CSteam3ServerS1_InitGameServer.linux.yaml

Background and robustness principle

CSteam3ServerS1_InitGameServer initializes the game-server networking state. It queries two 16-bit UDP ports from the network system, then uses INetworkServerService::IsActiveInGame to select which port to retain. Both targets are indirect virtual calls: their YAML identifies the call instruction and vtable slot, not a concrete function body.

First inspect the predecessor itself. If either call is absent, enumerate its direct callees, decompile plausible helpers, and search one or two levels down: an update may de-inline the networking setup into a helper (or inline it back into the predecessor). Identify calls by their receiver globals and neighboring behavior, never by a fixed function address or call-site address.

Output inventory

Both outputs are required on both platforms. The slot values below were observed in builds 14181 and 14186; derive and verify the current value from the instruction before writing YAML.

Output symbol Kind Windows reference Linux reference Writer skill
INetworkSystem_GetUDPPort indirect vcall INetworkSystem, 0x118, index 35 INetworkSystem, 0x118, index 35 /write-vfunc-as-yaml
INetworkServerService_IsActiveInGame indirect vcall CNetworkServerService_vtable, 0xC0, index 24 CNetworkServerService_vtable, 0xC8, index 25 /write-vfunc-as-yaml

Read the full file on GitHub · 122 lines

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. 15d ago Changed · +3 lines 3744ff3a4a03
  2. 1mo ago First seen · 119 lines · 139 tokens per session scan A 18d36a52bab8

Subscribe to this mod's changes

find-CSteam3ServerS1_InitGameServer-decompiles is a skill published in the GitHub repository HLND2T/CS2_VibeSignatures (67 stars, last pushed today), licensed MIT. It adds 139 tokens to every session and 1,648 once invoked, about $0.0006 per session on Opus 5.5. 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 2026-09-30.

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