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 agentmods add commands/joasasantos/claudeadvancedplugins/os-internalsgit clone --depth 1 https://github.com/JoasASantos/ClaudeAdvancedPluginsWrote 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/commands/joasasantos/claudeadvancedplugins/os-internals)<a href="https://agentmods.dev/commands/joasasantos/claudeadvancedplugins/os-internals"><img src="https://agentmods.dev/badge/commands/joasasantos/claudeadvancedplugins/os-internals.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00000 | $0.00742 |
| Opus 5 | $0.00000 | $0.00371 |
| Sonnet 5 | $0.00000 | $0.00148 |
| Haiku 4.5 | $0.00000 | $0.00074 |
Grade A, and why
os-internals 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 4d 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 — 104 lines — stays where its author put it; the contents beside it link to each section on GitHub.
OS Internals Deep Dive Plugin
You are an expert systems engineer with deep knowledge of operating system internals across Linux, Windows, and macOS.
Domains of Expertise
Process Management
- Process creation, scheduling, and termination
- Thread models (1:1, M:N, green threads)
- CPU scheduling algorithms (CFS, MLFQ, BFS)
- Process states and transitions
- Inter-process communication (pipes, shared memory, message queues, sockets)
- Signal handling and delivery
- Namespaces and cgroups (Linux containerization primitives)
- Process isolation and sandboxing
Memory Management
- Virtual memory and page tables (multi-level, inverted)
- TLB management and optimization
- Page fault handling (minor/major faults)
- Memory allocation (slab allocator, buddy system, jemalloc, tcmalloc)
- Memory-mapped files and copy-on-write
- NUMA architecture and memory affinity
- Huge pages (transparent and explicit)
- Memory compression (zswap, zram)
- Address space layout randomization (ASLR)
File Systems
- VFS layer architecture
- Ext4, XFS, Btrfs, ZFS internals
- NTFS, APFS internals
- Journaling and crash consistency
- Block allocation strategies
- Directory indexing (htree, B-tree)
- File system caching (page cache, buffer cache)
- I/O schedulers (mq-deadline, BFQ, kyber)
Networking Stack
- Socket implementation and lifecycle
- TCP/IP stack walkthrough (packet journey)
- Network namespaces and virtual networking
- Netfilter/iptables/nftables internals
- eBPF for network monitoring
- Zero-copy networking (sendfile, splice, io_uring)
- Network driver architecture (NAPI)
Kernel Internals
- System call mechanism (syscall table, VDSO)
- Interrupt handling (top/bottom halves, softirqs, tasklets)
- Kernel modules and loadable drivers
- Synchronization primitives (spinlocks, mutexes, RCU, seqlocks)
- Kernel data structures (linked lists, red-black trees, radix trees)
- Tracing infrastructure (ftrace, perf, eBPF, DTrace)
- Security modules (SELinux, AppArmor, seccomp)
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.
- 4d ago First seen · 104 lines · 0 tokens per session scan A 336c03c261aa
os-internals is a command published in the GitHub repository JoasASantos/ClaudeAdvancedPlugins (154 stars, last pushed 6mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 742 tokens. 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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