context-engineering

context-engineering is a skill for Claude Code, Codex from jcarlosrodicio/opencode-agent-orchestration-kit. It costs 43 tokens per session (1,857 once invoked), scanned A, original, Apache-2.0.

Guidance for deciding which project information a coding agent should see and when it should see it.

In plain words
What is it for?
Use it when starting a session, changing tasks, setting up rules files, or improving an agent's work on an existing codebase.
Why use it?
It reduces mistakes caused by missing instructions, too much context, outdated assumptions, or ignored project conventions.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: mentions CLAUDE.md; mentions AGENTS.md; mentions OpenCode.

Good fit Use it when starting a session, changing tasks, setting up rules files, or improving an agent's work on an existing codebase.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/jcarlosrodicio/opencode-agent-orchestration-kit/context-engineering
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 jcarlosrodicio/opencode-agent-orchestration-kit --skill context-engineering
Clone the repo
git clone --depth 1 https://github.com/jcarlosrodicio/opencode-agent-orchestration-kit

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-engineering

README.md
[![agentmods](https://agentmods.dev/badge/skills/jcarlosrodicio/opencode-agent-orchestration-kit/context-engineering/github.svg)](https://agentmods.dev/skills/jcarlosrodicio/opencode-agent-orchestration-kit/context-engineering)
Your own site
<a href="https://agentmods.dev/skills/jcarlosrodicio/opencode-agent-orchestration-kit/context-engineering"><img src="https://agentmods.dev/badge/skills/jcarlosrodicio/opencode-agent-orchestration-kit/context-engineering/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-engineering

Your own site · 80×15
<a href="https://agentmods.dev/skills/jcarlosrodicio/opencode-agent-orchestration-kit/context-engineering"><img src="https://agentmods.dev/badge/skills/jcarlosrodicio/opencode-agent-orchestration-kit/context-engineering.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 43 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,857 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. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 3 findings, 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 Privilege Escalation · line 77
    Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.
    Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
  • medium MCP Rug Pull · line 67
    npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.
    Fix: Pin the version: npx @scope/[email protected]
  • medium Excessive Agency · line 78
    Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.
    Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
How audits are shown
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 $0.00043 $0.01857
Opus 5.5 $0.00017 $0.00743
Sonnet 5.5 $0.00009 $0.00371
Haiku 4.5 $0.00004 $0.00186

Measured 1mo ago against content hash 314ad81d6bd8, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

context-engineering 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 1mo 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.

opencode/skills/context-engineering/SKILL.md · 253 lines

How it starts

The opening of the file, as written. The whole thing — 253 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Context Engineering

Overview

Feed agents the right information at the right time. Context is the single biggest lever for agent output quality — too little and the agent hallucinates, too much and it loses focus. Context engineering is the practice of deliberately curating what the agent sees, when it sees it, and how it's structured.

When to Use

  • Starting a new coding session
  • Agent output quality is declining (wrong patterns, hallucinated APIs, ignoring conventions)
  • Switching between different parts of a codebase
  • Setting up a new project for AI-assisted development
  • The agent is not following project conventions

The Context Hierarchy

Structure context from most persistent to most transient:

1. Rules Files (AGENTS.md, CLAUDE.md, etc.)  ← Always loaded, project-wide
2. Spec / Architecture Docs                   ← Loaded per feature/session
3. Relevant Source Files                       ← Loaded per task
4. Error Output / Test Results                 ← Loaded per iteration
5. Conversation History                        ← Accumulates, compacts

Level 1: Rules Files

Create a rules file that persists across sessions. This is the highest-leverage context you can provide.

For OpenCode, use AGENTS.md:

# Project: [Name]

## Tech Stack
- React 18, TypeScript 5, Vite, Tailwind CSS 4
- Node.js 22, Express, PostgreSQL, Prisma

## Commands
- Build: `npm run build`
- Test: `npm test`
- Lint: `npm run lint --fix`
- Dev: `npm run dev`
- Type check: `npx tsc --noEmit`

## Code Conventions
- Functional components with hooks (no class components)
- Named exports (no default exports)
- colocate tests next to source
- Use `cn()` utility for conditional classNames
- Error boundaries at route level

## Boundaries
- Never commit .env files or secrets
- Never add dependencies without checking bundle size impact
- Ask before modifying database schema
- Always run tests before committing

## Patterns
[One short example of a well-written component in your style]

Read the full file on GitHub · 253 lines

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. 1mo ago First seen · 253 lines · 43 tokens per session scan A 314ad81d6bd8

Subscribe to this mod's changes

context-engineering is a skill published in the GitHub repository jcarlosrodicio/opencode-agent-orchestration-kit (140 stars, last pushed 26d ago), licensed Apache-2.0. It adds 43 tokens to every session and 1,857 once invoked, about $0.0002 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.

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