Context Engineering Review
mohitagw15856/pm-claude-skills
Review what an LLM feature or agent actually puts in its context window — and find what's bloating, missing, or fighting itself.
Context is the complete state available to a language model at inference time.
Install Context Fundamentals
$ npx skills add aiskillstore/marketplace --skill context-fundamentals -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install aiskillstore/marketplace context-fundamentals --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/sickn33/context-fundamentals .claude/skills/context-fundamentals && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "context-fundamentals" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/sickn33/context-fundamentals into .claude/skills/context-fundamentals/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "context-fundamentals", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/aiskillstore/marketplace/tree/main/skills/sickn33/context-fundamentalsType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add aiskillstore/marketplace --skill context-fundamentals -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install aiskillstore/marketplace context-fundamentals --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/sickn33/context-fundamentals .agents/skills/context-fundamentals && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "context-fundamentals" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/sickn33/context-fundamentals into .agents/skills/context-fundamentals/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "context-fundamentals", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add aiskillstore/marketplace --skill context-fundamentals -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install aiskillstore/marketplace context-fundamentals --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/sickn33/context-fundamentals .cursor/skills/context-fundamentals && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "context-fundamentals" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/sickn33/context-fundamentals into .cursor/skills/context-fundamentals/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "context-fundamentals", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/aiskillstore/marketplace.git --path skills/sickn33/context-fundamentals--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add aiskillstore/marketplace --skill context-fundamentals -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install aiskillstore/marketplace context-fundamentals --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/sickn33/context-fundamentals .gemini/skills/context-fundamentals && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "context-fundamentals" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/sickn33/context-fundamentals into .gemini/skills/context-fundamentals/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "context-fundamentals", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install aiskillstore/marketplace context-fundamentalsInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add aiskillstore/marketplace --skill context-fundamentals -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/sickn33/context-fundamentals .github/skills/context-fundamentals && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "context-fundamentals" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/sickn33/context-fundamentals into .github/skills/context-fundamentals/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "context-fundamentals", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add aiskillstore/marketplace --skill context-fundamentals -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install aiskillstore/marketplace context-fundamentals --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/sickn33/context-fundamentals .opencode/skills/context-fundamentals && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "context-fundamentals" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/sickn33/context-fundamentals into .opencode/skills/context-fundamentals/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "context-fundamentals", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
context-fundamentals- GitHub stars
- 430
- Used in
- 6 other repos
- Token cost
- ~3.1k tokens
- SKILL.md length
- 1,469 words
- Files
- 2
- Skills in repo
- 1,044
- Repo updated
- First seen
- Licence
- None found
At a glance
Context is the complete state available to a language model at inference time.
- Works in 8 steps: Treat context as a finite resource with… → Place critical information at… → Use progressive disclosure to defer… → …
- Tasks that involve Structured output and tool calling
- SKILL.md covers When to Use, Core Concepts, Detailed Topics and Practical Guidance, plus 6 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Context Fundamentals is an agent skill from aiskillstore/marketplace. Context is the complete state available to a language model at inference time. It includes everything the model can attend to when generating responses: system instructions, tool definitions, retrieved documents, message history, and tool outputs.
Its SKILL.md is about 3.1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file (for example `skill-report.json`).
It sits in AI & LLM Engineering, covering Structured output and tool calling and Context engineering. The repository describes itself as: Security-audited skills for Claude, Codex & Claude Code. One-click install, quality verified.
When your agent uses it
- Tasks that involve Structured output and tool calling
- Tasks that involve Context engineering
Example prompts
- “/context-fundamentals”
Requirements
- Python 3
Workflow steps
8 steps, taken from the first numbered list in SKILL.md.
- Treat context as a finite resource with diminishing returns
- Place critical information at attention-favored positions (beginning and end)
- Use progressive disclosure to defer loading until needed
- Organize system prompts with clear section boundaries
- Monitor context usage during development
- Implement compaction triggers at 70-80% utilization
- Design for context degradation rather than hoping to avoid it
- Prefer smaller high-signal context over larger low-signal context
What it can do on your machine
Read from SKILL.md and the folder at commit 755bc35. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are markdown).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Context Fundamentals loads about 3.1k tokens when it runs. Until then it costs about 67 tokens; SKILL.md has 1,469 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Without a licence we can't republish the file, so here is its outline and opening line. It has 1,469 words (~3,083 tokens).
“Context is the complete state available to a language model at inference time. It includes everything the model can attend to when generating responses: system instructions, tool definitions, retrieved documents, message history, and tool outputs. Understanding context fundamentals is prerequisite…”
- name
- context-fundamentals
- risk
- unknown
- source
- community
Files
SKILL.md and 1 other file in skills/sickn33/context-fundamentals of aiskillstore/marketplace.
- SKILL.md
- skill-report.json
Open the folder on GitHubat commit 755bc35
Used in 6 other repositories
We found 17 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 6 other GitHub owners. This page covers the copy in aiskillstore/marketplace, which our catalogue first saw on October 7, 2026.
- sickn33/agentic-awesome-skillsskills/context-fundamentalsplugins/agentic-awesome-skills/skills/context-fundamentals+1 more
- agent-skills-hub/agent-skills-hubskills/context-fundamentals
- lingxling/awesome-skills-cnantigravity-awesome-skills/skills/context-fundamentalsantigravity-awesome-skills/plugins/agentic-awesome-skills/skills/context-fundamentals+1 more
- foryourhealth111-pixel/Vibe-Skillsbundled/skills/context-fundamentals
- benjaminasterA/antigravity-awesome-skillsskills/context-fundamentals
- henryalouf/ruflow.agents/skills/context-fundamentals.agents/skills/antigravity-awesome-skills/skills/context-fundamentals+4 more
Compare with similar skills
Context Fundamentals next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Context Fundamentals this skillaiskillstore/marketplace | 430 | 6 repos | ~3.1k | Automated safety check: Pass | None | |
| Context Engineering Reviewmohitagw15856/pm-claude-skills | 1.4k | — | ~1.4k | Automated safety check: Pass | MIT | |
| Agent Experiencesingula-ai/alego | 109 | 1 repos | ~531 | Automated safety check: Pass | MIT | |
| Project Developmentguanyang/open-agent-hub | 977 | 2 repos | ~4.7k | Automated safety check: Pass | MIT | |
| Discover Agenticrand/cc-polymath | 181 | — | ~1.4k | Automated safety check: Pass | MIT | |
| Planning With Filesjarrodwatts/claude-code-config | 1.1k | 5 repos | ~967 | Automated safety check: Pass | None |
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Related
Categories
Questions about Context Fundamentals
What does Context Fundamentals do?
Context is the complete state available to a language model at inference time. Context Fundamentals is an agent skill from aiskillstore/marketplace. Context is the complete state available to a language model at inference time.
When should I use Context Fundamentals?
Context Fundamentals fits situations like: tasks that involve Structured output and tool calling; tasks that involve Context engineering.
How do I install Context Fundamentals in Claude Code?
Run `npx skills add aiskillstore/marketplace --skill context-fundamentals -a claude-code`. Or copy the skill folder (skills/sickn33/context-fundamentals in aiskillstore/marketplace) into .claude/skills/context-fundamentals in your project. Claude Code loads it when a task matches its description.
How do I install Context Fundamentals in Codex?
Run `npx skills add aiskillstore/marketplace --skill context-fundamentals -a codex`. Or copy the skill folder (skills/sickn33/context-fundamentals in aiskillstore/marketplace) into .agents/skills/context-fundamentals in your project. Codex loads it when a task matches its description.
Can I use Context Fundamentals in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add aiskillstore/marketplace --skill context-fundamentals -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/context-fundamentals, .gemini/skills/context-fundamentals, .github/skills/context-fundamentals and .opencode/skills/context-fundamentals in your project.
What does Context Fundamentals need to run?
SKILL.md names no scripts, command-line tools or credentials: Context Fundamentals is instructions for the agent only. Our summary lists: Python 3.
Does Context Fundamentals access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Context Fundamentals safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Context Fundamentals use?
No licence was found for Context Fundamentals or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Context Fundamentals use?
About 3.1k tokens (SKILL.md is roughly 12k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Context Fundamentals?
Skills that share tags, products or a category with Context Fundamentals: Context Engineering Review (mohitagw15856/pm-claude-skills, 1.4k stars), Agent Experience (singula-ai/alego, 109 stars), Project Development (guanyang/open-agent-hub, 977 stars) and Discover Agentic (rand/cc-polymath, 181 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Context Fundamentals?
aiskillstore (a GitHub organization) maintains it in aiskillstore/marketplace, which has 430 GitHub stars. The repository holds 1,044 skills in this directory. The repository was last updated on October 9, 2026.
Source: aiskillstore/marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.