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 ninjagit 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/ninja)<a href="https://agentmods.dev/skills/mohitmishra786/low-level-dev-skills/ninja"><img src="https://agentmods.dev/badge/skills/mohitmishra786/low-level-dev-skills/ninja/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/ninja"><img src="https://agentmods.dev/badge/skills/mohitmishra786/low-level-dev-skills/ninja.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 | $0.00081 | $0.01255 |
| Opus 5 | $0.00041 | $0.00628 |
| Sonnet 5 | $0.00016 | $0.00251 |
| Haiku 4.5 | $0.00008 | $0.00126 |
Grade A, and why
ninja scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 181 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Ninja
Purpose
Guide agents through Ninja as a build executor: diagnosing failures, controlling parallelism, generating from CMake, and understanding the .ninja file format when needed.
Triggers
- "Ninja is failing — how do I get more output?"
- "How do I use Ninja with CMake?"
- "How many parallel jobs does Ninja use?"
- "How do I add a custom build step in Ninja?"
- "What is a
build.ninjafile?"
Workflow
1. Ninja as a CMake generator
The most common use of Ninja is as the build executor for CMake:
# Configure with Ninja
cmake -S . -B build -G Ninja
cmake --build build # uses ninja internally
# Or invoke ninja directly
cd build && ninja
# Specify parallelism
ninja -j4
ninja -j$(nproc)
# Build specific target
ninja myapp
ninja install
CMake also supports Ninja Multi-Config:
cmake -S . -B build -G "Ninja Multi-Config"
cmake --build build --config Release
cmake --build build --config Debug
2. Verbose output and diagnostics
# Show full commands (not just [CC] foo.c)
ninja -v
# Dry run (show what would be built)
ninja -n
# Show why a target needs rebuilding
ninja -d explain myapp
# Print all targets
ninja -t targets all
# Print targets grouped by rule
ninja -t targets rule cc
# Dependency graph (graphviz)
ninja -t graph myapp | dot -Tsvg -o deps.svg
3. Common Ninja flags
| Flag | Effect |
|---|---|
-j N |
Parallel jobs (default: CPUs + 2) |
-l N |
Don't start new jobs if load average > N |
-k N |
Keep going after N failures (default 1) |
-v |
Verbose: show full command lines |
-n |
Dry run |
-C dir |
Change to dir before doing anything |
-t tool |
Run a sub-tool (clean, query, targets, graph, compdb) |
4. Cleaning
ninja -t clean # remove build outputs
ninja -t clean -g # also remove generated files
Or via CMake:
cmake --build build --target clean
5. compile_commands.json
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 · 181 lines · 81 tokens per session scan A 3a24fc325fb0
ninja is a skill published in the GitHub repository mohitmishra786/low-level-dev-skills (198 stars, last pushed 2mo ago), licensed MIT. It adds 81 tokens to every session and 1,255 once invoked, about $0.0004 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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