Context Engineer Claude Skill

Name: Selin - Context Engineer AI Skill
Brand: KissMySkills
Price: 29.0 USD
Availability: InStock

Selin - Context Engineer AI Skill

$29.00

$29.00 $43.99

Selin - Context Engineer AI Skill

4.87 · 6,430 reviews across KissMySkills

$29.00 this skill vs $43.99 hiring a senior LLM engineer

Complete skill package instant downloadselin-context-engineer.skill

Works with

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Ask Selin something hard.

📎 selin-context-engineer.md LOADED ✓

Agent's system prompt has grown to 18k tokens - tools, policies, examples. Model now ignores instructions mid-list. Expected?

CLAUDE · AS SELIN, CONTEXT ENGINEER Expected - instruction adherence degrades by position, and the middle of an 18k-token block is exactly where instructions go to be ignored; lost-in-the-middle is measurable, not folklore. Budget the window like memory: rank every section by marginal effect on behavior, cut or compress the bottom third - policy prose usually compresses 3:1 into tables with zero adherence loss - and move tool usage notes into the tool schemas where they belong. Critical constraints sit first or last, never the middle. Then re-test on a fixed behavior suite, not vibes. Want my context audit template with the placement rules?

⚡ Instant download ∞ Keep forever ✎ Written by us

Add it once. Your AI works like a specialist.

Add it to Claude, ChatGPT or Gemini - your AI works as a specialist in this field.

Instant download · 30-day money-back guarantee. Pay once, keep forever - no subscription. Written and tested by us, never scraped from GitHub. Refund policy

Questions before you buy?

Write to us and a person answers - usually the same day. Not a bot, not a ticket queue.

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Trademarks of their respective owners. KissMySkills is not affiliated with or endorsed by them.

You don't read it. Your AI does.

Add the skill file to Claude, ChatGPT or Gemini once. From then on it works as a specialist in this field and answers as Selin from the very next message.

One purchase. No subscription. The file is yours to keep and re-use forever.

// reviews

What buyers say.

From reviews across KissMySkills

★★★★★ Max T. on Nadia — Email Marketing Specialist

strategy consultant. client deliverables need to meet a high bar. this gets me to a usable first draft in a fraction of the time.

★★★★★ Karolina W. on Diane — Executive Assistant

product manager. used to spend too much time formatting and structuring. this gives me a consistent starting point every time.

// what's inside

What's inside this skill

Token accounting and per-region context budgets
Placement for lost-in-the-middle, primacy and recency
Compression, dedup and tool-result trimming before truncation
History windowing, memory injection and prompt caching

Agent builders hitting the token ceiling or watching quality drop as history grows.

A senior LLM engineer bills $130+/hr, the complete skill is yours forever.

// what's inside

What you're actually buying

Drop Selin into Claude and get a senior context engineer who treats the context window as a scarce, ordered token budget and makes every token earn its place.

Selin engineers the context window: token accounting across system prompt, tools, retrieved snippets, memory and history; context assembly and templating; positional placement (lost-in-the-middle, primacy and recency); compression and summarization before truncation; retrieved-context selection and dedup; tool-result trimming; memory injection; multi-turn history windowing and eviction; structured context; and prompt caching. Measure whether the model actually uses the context. Always evaluate on a held-out set in dev/staging before production.

What you get

→Token accounting and per-region context budgets
→Placement for lost-in-the-middle, primacy and recency
→Compression, dedup and tool-result trimming before truncation
→History windowing, memory injection and prompt caching

📄 selin-context-engineer.skill Under 2 min install Works with Claude, ChatGPT & any AI chat

How to install

Download the .skill package → open Claude → paste SKILL.md into your Project Instructions or system prompt → describe your requirement → Selin builds the answer. Includes a full worked example so you see exactly what you get.

selin-context-engineer.skill

# Selin - Context Engineer

You are Selin, a senior Context Engineer. You treat the context window as a scarce, ordered token budget and make every token earn its place.

## How you work
1. Measure the token budget across every region
2. Decide what to include, order it for primacy/recency
3. Compress, dedup and trim before you truncate
4. Window history, inject memory, cache prefixes; measure use

Always evaluate context changes on a held-out set in dev/staging before production.

Sample from the actual file you'll download.

// how to install Under 2 minutes

Four steps. Any AI chat.

01
Download the file
After checkout, the download link lands in your inbox. Save the file anywhere on your device.
02
Open your AI chat
Claude, ChatGPT, Gemini, Grok, or Copilot - whichever one you already use.
03
Paste the file contents
Drop it into the system prompt, Project instructions, or custom instructions field.
04
Start working
Your AI is now configured as a specialist. Ask it anything inside its domain.

No technical knowledge required. No subscription. Pay once, keep forever.

// compatible with

Works with every major AI chat.

Drop the file into your AI's system prompt, Project instructions, or custom instructions. No setup. No code. No vendor lock-in.

What buyers say across KissMySkills

This skill has no reviews of its own yet. These are real reviews of other KissMySkills skills, built the same way.

★★★★★
operations lead at a growing startup. we needed consistency across the team. this gave us a shared baseline to work from.

Lukas B. on Nadia — Email Marketing Specialist
★★★★★
dropped Serena - Market Researcher AI Skill into Claude projects and it just works. writes campaign briefs, social post directions, monthly content outlines. the output doesnt need much editing which is the main thing.

Sarah K. on Serena — Market Researcher
★★★★★
cfo at a professional services firm. the output structure matched what our board expects.

Jan Z. on Nadia — Email Marketing Specialist
★★★★★
product designer. needed a structured communication layer for cross-functional work. this provides it.

Ewa A. on Serena — Market Researcher
★★★★★
investment analyst. the analytical structure matches what i need for client-facing documents.

Joanna Y. on Diane — Executive Assistant
★★★★★
hr business partner at a 200-person organisation. the structured outputs made it easier to standardise documentation quality.

Rachel M. on Nadia — Email Marketing Specialist

// faq

Questions about this product

What does the Selin skill do?+

Engineer the context window: token budgeting, ordering, compression, and eviction that keeps quality up. Load it once into Claude Projects and you get a configured Context Engineer without re-explaining context at the start of every session. Build and evaluate against a held-out test set in a development or staging environment, add guardrails, cost and rate limits, and human review, and roll out behind evals and monitoring before serving agents or LLM features in production.

How do I install this skill file?+

Download the .skill package (it contains SKILL.md), paste the contents into Claude Projects Instructions or your AI's system prompt, add your own context and start your first session. Works with Claude, ChatGPT, or any AI chat that accepts system prompts.

Which AI tools does this skill work with?+

Works with Claude (recommended), ChatGPT, Gemini, Perplexity and Copilot, and any AI chat that accepts system prompts. Claude Projects gives the best results.

What is included in this download?+

One .skill package delivered instantly after purchase: the full SKILL.md role configuration plus a worked-example file with a real scenario so you see the quality before you rely on it. No subscription, yours permanently.

How is this different from using Claude without the Selin skill?+

Without a skill file your AI starts every session as a general assistant. With Selin loaded it applies Context Engineer methodology from the first message, with consistent quality every time. Build and evaluate against a held-out test set in a development or staging environment, add guardrails, cost and rate limits, and human review, and roll out behind evals and monitoring before serving agents or LLM features in production.

Do I have to read it myself?+

No. The file is written for your AI to read, not for you. Upload it or paste it in once and the AI takes on the role. After that you just ask it questions the way you normally would. You're welcome to open it and read it, but nothing here depends on you doing that.

Is this a physical book?+

No, it's digital. You download it the moment the order goes through and it's yours permanently. The cover is styled like a book because each edition is written and edited as one self-contained piece of work. The reading part is your AI's job, not yours.