Borrowing it
Nothing to install: this file belongs to jacob-dietle/context-os. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/jacob-dietle/context-os/main/.claude/skills/code-service-defrag/SKILL.mdgit clone --depth 1 https://github.com/jacob-dietle/context-osWrote 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/jacob-dietle/context-os/code-service-defrag)<a href="https://agentmods.dev/skills/jacob-dietle/context-os/code-service-defrag"><img src="https://agentmods.dev/badge/skills/jacob-dietle/context-os/code-service-defrag/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/jacob-dietle/context-os/code-service-defrag"><img src="https://agentmods.dev/badge/skills/jacob-dietle/context-os/code-service-defrag.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Anti-Refusal · line 123 Skill instructs the agent to omit warnings, disclaimers, or ethical commentary. Stripping safety caveats hides risk from the user and is a common jailbreak preamble.Fix: Remove instructions that suppress warnings, disclaimers, or ethical commentary. Let the agent surface safety-relevant caveats to the user.
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 | $0.00163 | $0.03498 |
| Opus 5.5 | $0.00065 | $0.01399 |
| Sonnet 5.5 | $0.00033 | $0.00700 |
| Haiku 4.5 | $0.00016 | $0.00350 |
Grade A, and why
code-service-defrag 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 2mo 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 — 220 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Code + Service Defrag
Periodic consolidation of a fragmenting codebase — code AND context — back into coherent, single-source-of-truth wholes. The maintenance discipline that counteracts the entropy agentic coding produces.
Meta-Principle: Agentic coding fragments state faster than humans consolidate it. Fragmentation only accumulates — it is the second law applied to repos. Defrag is the periodic counter-force. Run it on a cadence, or discover the fragmentation the day a deploy fires from the wrong directory.
Why Fragmentation Is Inevitable (it is not a failure)
Conway's Law says a system mirrors the communication structure of whoever built it. Invert it: a codebase touched by parallel agents and multiple humans across many sessions — with no single mind holding the whole map — necessarily accumulates fragments. Duplicate configs, forks, orphan specs, services quietly sharing a database. This is not sloppiness to feel bad about; it is the expected entropy of high-leverage, multi-actor development. The only real question is whether you defrag periodically or meet the fragmentation when it detonates.
The leverage of agentic coding (ship 10x faster) is paid for in visibility (nobody holds the full map). Defrag buys the visibility back, cheaply, on a schedule.
Two Terrains Fragment in Parallel
| Terrain | Fragments into | Detonates as |
|---|---|---|
| Code | duplicate deploy targets, colliding bindings, stale forks, orphan repos | a silent prod overwrite — deploy from the wrong dir clobbers the live one |
| Context | parallel spec conventions, orphan docs, scattered context packages | a false foundation — an agent onboards from the wrong context and builds on it |
Treat both as first-class. Code drift fails loud (eventually — when a deploy detonates). Context drift fails silent — an agent reads the wrong spec, produces confidently wrong work, and nobody notices until it ships. The context half of this skill is not a footnote to the code half; it is the half that fails without a stack trace.
What ships with it
11 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.
- references/cadence.md 3.2 KB
- references/downstream-handoff.md 4.9 KB
- references/landmine-patterns.md 8.1 KB
- references/platform-collision-semantics.md 4.9 KB
- scripts/defrag_scan.sh 1.6 KB runs code
- scripts/scan_archive_markers.sh 1.6 KB runs code
- scripts/scan_bindings.sh 4.4 KB runs code
- scripts/scan_deploy_surface.sh 3.8 KB runs code
- scripts/scan_deploy_target_names.sh 6.2 KB runs code
- scripts/scan_spec_dirs.sh 4.9 KB runs code
- scripts/scan_stale_forks.sh 2.7 KB runs code
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.
- 2mo ago First seen · 220 lines · 163 tokens per session scan A f0b234c25a00
code-service-defrag is a skill published in the GitHub repository jacob-dietle/context-os (115 stars, last pushed 2mo ago), licensed MIT. It adds 163 tokens to every session and 3,498 once invoked, about $0.0007 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 2026-08-30.
code-service-defrag compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| code-service-defragjacob-dietle/context-os | Skill | 115 | 2mo ago | MIT | A | 163 | Claude Code |
| systematic-debuggingopen-metadata/OpenMetadata | Skill | 16k | yesterday | Apache-2.0 | A | 37 | Claude Code |
| log-error-digestzebbern/claude-code-guide | Skill | 4.7k | 3d ago | MIT | A | 71 | Claude Code, Codex |
| cwv-optimizeradobe/skills | Skill | 319 | yesterday | Apache-2.0 | A | 112 | Claude Code |
| ci-fixersipyourdrink-ltd/bernstein | Skill | 1.2k | yesterday | Apache-2.0 | A | 15 | Claude Code, Codex |
| incident-response-incident-responsermyndharis/antigravity-skills | Skill | 1.9k | 23d ago | MIT | A | 36 | Claude Code |
| triaging-web-analytics-supportPostHog/posthog | Skill | 41k | yesterday | none | A | 151 | Claude Code, Codex |