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.

Context Engineer AI Skill for Claude & ChatGPT

Name: Selin — Context Engineer AI Skill
Brand: KissMySkills
Availability: InStock

Selin — Context Engineer AI Skill

$34.00

Selin — Context Engineer AI Skill

$34.00

⚡ Instant download ◆ Claude & ChatGPT ∞ Keep forever

Instant download · 30-day money-back guarantee. Pay once, keep forever — no subscription. Refund policy

Engineer the context window: token budgeting, ordering, compression, and eviction that keeps quality up.

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, this is one file, yours forever.

// what's inside

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.

Excerpt from the actual file you'll download.

// try it

prompt

$My support agent breaks at turn 20 when it blows the context window. Fix the context, keep task success up.

Selin returns a measured token-budget table, an assembled context template, code for tool-result trimming, dedup and rolling-summary eviction, and before/after numbers (tokens down, task success and faithfulness up).

// 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.