Borrowing it
Nothing to install: this file belongs to kok-o/contextos-agents. 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/kok-o/contextos-agents/main/.agents/core/skills/context-os/SKILL.mdgit clone --depth 1 https://github.com/kok-o/contextos-agentsWrote 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/kok-o/contextos-agents/context-os)<a href="https://agentmods.dev/skills/kok-o/contextos-agents/context-os"><img src="https://agentmods.dev/badge/skills/kok-o/contextos-agents/context-os/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/kok-o/contextos-agents/context-os"><img src="https://agentmods.dev/badge/skills/kok-o/contextos-agents/context-os.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00016 | $0.00405 |
| Opus 5.5 | $0.00006 | $0.00162 |
| Sonnet 5.5 | $0.00003 | $0.00081 |
| Haiku 4.5 | $0.00002 | $0.00040 |
Grade A, and why
context-os 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 today.
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 — 41 lines — stays where its author put it; the contents beside it link to each section on GitHub.
context-os
Overview
Guide configuration of the ContextOS compiler, resolver, profiles, and agent exports. Executable behavior lives in the CLI and modules; this Markdown entrypoint is guidance.
When to Use
Skill selection, context budgets, manifests, project overrides, profiles, exports, and configuration drift.
Rules & Patterns
Inspect the active project and installed skills. Canonical sources live in .agents/core/skills; project overrides in .agents/project/skills; plugins provide additional sources. Native .agents/skills contains generated projections. Entrypoint precedence is skill.v2.yaml, skill.yaml, then manifestless SKILL.md. Respect the declared entrypoint and resolve contained resource paths relative to its skill directory.
Use the resolver with the task and affected files; inspect reasons, risk, warnings, missing skills, and soft-budget overflow. Load references only when needed. Existing authorization and proportional engineering-workflow apply.
Read references/context-rules.md for budgeting and references/project-graph.md for graph limits.
Code Examples
In this source checkout: node .agents/ctx.js resolve "Fix IDOR" --files src/auth.ts --json. See EXAMPLES.md for source and consumer command boundaries.
Validation Checklist
- The requested outcome and applicable failure cases are checked.
- Evidence names commands, results, scope, and limitations.
- Unrelated changes and existing authorization are preserved.
Common Mistakes
Editing generated projections; assuming catalog skills are installed; treating an estimated budget as total prompt size; expecting AST or document selection from the package graph; claiming schema validation proves agent behavior.
Integration Notes
context-manager is a deprecated compatibility alias. engineering-workflow owns the lifecycle; security owns protected boundaries. packs.yaml and rules.yaml are reference data, not executable policy.
What ships with it
9 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.
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.
- today First seen · 41 lines · 16 tokens per session scan A 3d333bd492b2
context-os is a skill published in the GitHub repository kok-o/contextos-agents (10 stars, last pushed today), licensed Apache-2.0. It adds 16 tokens to every session and 405 once invoked, about $0.0001 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 2026-10-25.
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Light coding workflow: features, fixes, refactors, unit tests, etc.; scales small to large.
coding-agents-prompting-flow
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