context-os

context-os is a skill for Claude Code, Codex from kok-o/koko-contextos-agents. It costs 49 tokens per session (1,127 once invoked), scanned A, original, MIT.

A project context manager for AI agents. It turns a user's request into the smallest set of relevant requirements, architecture details, plans, and development context.

In plain words
What is it for?
Use it to classify a task, identify the application's parts such as frontend, database, or authentication, resolve required project guidance, and support work from idea through release.
Why use it?
It reduces the amount of unrelated project information an agent must process and helps keep work aligned with the current stage.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents).

Good fit Use it to classify a task, identify the application's parts such as frontend, database, or authentication, resolve required project guidance, and support work from idea through release.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/kok-o/koko-contextos-agents/context-os
Install

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.

Any agent
npx skills add kok-o/koko-contextos-agents --skill context-os
Clone the repo
git clone --depth 1 https://github.com/kok-o/koko-contextos-agents

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for context-os

README.md
[![agentmods](https://agentmods.dev/badge/skills/kok-o/koko-contextos-agents/context-os/github.svg)](https://agentmods.dev/skills/kok-o/koko-contextos-agents/context-os)
Your own site
<a href="https://agentmods.dev/skills/kok-o/koko-contextos-agents/context-os"><img src="https://agentmods.dev/badge/skills/kok-o/koko-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.

agentmods 80×15 button for context-os

Your own site · 80×15
<a href="https://agentmods.dev/skills/kok-o/koko-contextos-agents/context-os"><img src="https://agentmods.dev/badge/skills/kok-o/koko-contextos-agents/context-os.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 49 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,127 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00049 $0.01127
Opus 5 $0.00024 $0.00563
Sonnet 5 $0.00010 $0.00225
Haiku 4.5 $0.00005 $0.00113

Measured 9d ago against content hash 536626fe63dc, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

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 9d 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.

.agents/core/skills/context-os/SKILL.md · 170 lines

How it starts

The opening of the file, as written. The whole thing — 170 lines — stays where its author put it; the contents beside it link to each section on GitHub.

context-os

Overview

A brief summary of what the skill does and its core philosophy.

When to Use

Context for when this skill is applicable.

Rules & Patterns

You are the Context Compiler. Your job is NOT to know everything. Your job is to assemble the minimum context needed for the current task.

Pipeline

When a user gives you a task, follow this pipeline:

Stage 1: Intent Analysis

Analyze the user's prompt and determine:

intent:
  project_type: [webapp, api, mobile, cli, library, saas, crm, ecommerce]
  industry: [healthcare, fintech, education, social, general]
  layers:
    frontend: true/false
    backend: true/false
    database: true/false
    auth: true/false
    ai: true/false
    payments: true/false
    realtime: true/false
  scope: [new_project, feature, bugfix, refactor, architecture]

Stage 2: Dependency Resolution

For each required layer, load the skill graph:

  1. Read skill.yaml from each relevant skill directory
  2. Resolve requires — load mandatory dependencies
  3. Check conflicts — ensure no incompatible skills are loaded
  4. Apply optional — suggest but don't force
  5. Respect project profile (if set) — apply rules from profiles/

Dependency resolution example:

Need: nextjs
  → requires: react, typescript
    → react requires: typescript (already loaded)
  → optional: tailwind, prisma, next-auth
  
Loaded: [nextjs, react, typescript]
Suggested: [tailwind, prisma, next-auth]

Stage 3: Context Compilation

Assemble context from three levels:

Level 1 — Vision (always available):

  • docs/PRD.md — what are we building
  • docs/ROADMAP.md — where are we going
  • docs/PROJECT_GRAPH.md — project structure

Level 2 — Architecture (load when needed):

  • docs/ARCHITECTURE.md — system design
  • docs/DATABASE.md — data model
  • docs/API.md — API contracts
  • docs/decisions/ — prior decisions

Level 3 — Development (load per task):

  • Relevant skill .md files
  • docs/UI.md — for frontend tasks
  • docs/TASKS.md — current sprint

Read the full file on GitHub · 170 lines

Files

What ships with it

8 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.

Changes

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.

  1. 9d ago First seen · 170 lines · 49 tokens per session scan A 536626fe63dc

Subscribe to this mod's changes

context-os is a skill published in the GitHub repository kok-o/koko-contextos-agents (2 stars, last pushed 5d ago), licensed MIT. It adds 49 tokens to every session and 1,127 once invoked, about $0.0002 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 2026-08-31.