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 mohitmishra786/low-level-dev-skills --skill msvc-clgit clone --depth 1 https://github.com/mohitmishra786/low-level-dev-skillsWrote 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/mohitmishra786/low-level-dev-skills/msvc-cl)<a href="https://agentmods.dev/skills/mohitmishra786/low-level-dev-skills/msvc-cl"><img src="https://agentmods.dev/badge/skills/mohitmishra786/low-level-dev-skills/msvc-cl/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/mohitmishra786/low-level-dev-skills/msvc-cl"><img src="https://agentmods.dev/badge/skills/mohitmishra786/low-level-dev-skills/msvc-cl.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- 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 | $0.00101 | $0.01519 |
| Opus 5 | $0.00051 | $0.00759 |
| Sonnet 5 | $0.00020 | $0.00304 |
| Haiku 4.5 | $0.00010 | $0.00152 |
Grade A, and why
msvc-cl 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 10d 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 — 142 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MSVC cl.exe and clang-cl
Purpose
Guide agents through Windows C/C++ compilation: MSVC cl.exe, clang-cl as MSVC-compatible driver, MSBuild project settings, and runtime library choices.
Triggers
- "How do I compile with MSVC from the command line?"
- "What is the MSVC equivalent of
-O2?" - "/MT vs /MD — which do I use?"
- "How do I use clang-cl instead of cl.exe?"
- "I'm getting LNK errors on Windows"
- "How do I generate PDB files?"
Workflow
1. Set up the environment
MSVC requires the Visual Studio environment variables. Use the Developer Command Prompt or set up manually:
REM x64 native
"C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Auxiliary\Build\vcvars64.bat"
REM x86 cross (host x64, target x86)
"...\vcvarsamd64_x86.bat"
REM Check compiler version
cl /?
In CMake, use the "Visual Studio 17 2022" generator or pass -DCMAKE_GENERATOR="Visual Studio 17 2022".
2. Flag translation: GCC → MSVC
| GCC/Clang | MSVC cl.exe | Notes |
|---|---|---|
-O0 |
/Od |
Debug, no optimisation |
-O1 |
/O1 |
Minimise size |
-O2 |
/O2 |
Maximise speed |
-O3 |
/Ox |
Full optimisation |
-Os |
/Os |
Favour size |
-g |
/Zi |
PDB debug info |
-g (embedded) |
/Z7 |
Debug info in object file |
-Wall |
/W3 or /W4 |
Warning level |
-Werror |
/WX |
Warnings as errors |
-std=c++17 |
/std:c++17 |
Standard selection |
-DFOO=1 |
/DFOO=1 |
Preprocessor define |
-I path |
/I path |
Include path |
-c |
/c |
Compile only (no link) |
-o out |
/Fe:out.exe or /Fo:out.obj |
Output file |
-shared |
/LD |
Build DLL |
-fPIC |
(implicit on Windows) | Not needed on Windows |
-flto |
/GL (compile) + /LTCG (link) |
Whole program optimisation |
3. Runtime library selection
This is the most common source of LNK errors on Windows.
| Flag | Runtime | Use case |
|---|---|---|
/MD |
MSVCRT.dll (dynamic) |
Release, DLL linkage (recommended default) |
/MDd |
MSVCRTd.dll (debug dynamic) |
Debug builds |
/MT |
Static CRT | Standalone exe; avoid mixing with DLLs |
/MTd |
Static CRT debug | Debug + static |
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.
- 10d ago First seen · 142 lines · 101 tokens per session scan A 0bd797888c9f
msvc-cl is a skill published in the GitHub repository mohitmishra786/low-level-dev-skills (201 stars, last pushed 2mo ago), licensed MIT. It adds 101 tokens to every session and 1,519 once invoked, about $0.0005 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 2026-08-30.
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