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Context Engineering Fundamentals

A principles skill for managing attention and evidence so long agent sessions stop dropping instructions.

Dev & CodingIntermediate★ 368⑂ 64AI score 9/10Last updated: Aug 21, 2026

What it does

Helps you diagnose and counter context quality decay in long conversations and multi-agent setups.

  • Five degradation patterns: lost-in-middle, context poisoning, distraction, confusion, and clash — each with a concrete mitigation.
  • Symptom-to-cause table: maps behaviors like "ignores earlier instructions" or "gets progressively worse" back to a likely root cause.
  • Measure before compressing: rejects fixed token thresholds and asks you to test retrieval quality at several evidence positions on your own model and task.
  • Four strategies: write state externally (path agreed with the user, ideally a gitignored scratch file), select context carefully, compress strategically, and isolate contexts via subagents.

Who it's for

  • Developers running long refactor or investigation sessions where early rules get forgotten
  • Anyone designing subagents or multi-step agent pipelines
  • Researchers and PMs who want measurable agent-quality improvements

Examples

  1. Diagnosing dropped rules: after two hours the code style constraints are ignored; you identify lost-in-middle and restate critical constraints at both the start and end.
  2. Navigating a big codebase: instead of "here are all 50 files, find the bug," narrow it to the 3 files involved in the error.
  3. Resuming long work: log each major step to an agreed, gitignored PROGRESS.md and read it back at the start of the next session to restore state.

· · · Install guide · · ·

Try it now, no install

Paste this into Claude to use the skill without installing anything.

Read the instructions in this file and follow them to help me:
https://raw.githubusercontent.com/jamditis/claude-skills-journalism/HEAD/dev-toolkit/skills/context-engineering-fundamentals/SKILL.md

What I want: (describe your task here)

If Claude can't open the link, open it yourself and paste the contents instead.

↓ If it works for you, download the ZIP below and install it. Then it runs on its own — no pasting each time.

Install in the Claude app (no terminal)
  1. Download the ZIP with the button below.
  2. In Claude, open Settings → Capabilities and turn on 'Code execution and file creation'. (one time)
  3. Go to Customize → Skills → + → 'Upload a skill' and upload the ZIP.
↓ Download ZIP
Install in Claude Code

Let Claude do it — paste this into Claude Code

Install the skill I found on Claude Skill Mart.
Copy the dev-toolkit/skills/context-engineering-fundamentals folder from the GitHub repo jamditis/claude-skills-journalism into my ~/.claude/skills/context-engineering-fundamentals/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

git clone https://github.com/jamditis/claude-skills-journalism.git && mkdir -p ~/.claude/skills && cp -r claude-skills-journalism/dev-toolkit/skills/context-engineering-fundamentals ~/.claude/skills/

⚠ This is a third-party skill. Check the source repository before installing.

  1. Open a terminal.
  2. Clone the repository: git clone https://github.com/jamditis/claude-skills-journalism.git
  3. Create the skills directory if needed: mkdir -p ~/.claude/skills
  4. Copy the skill: cp -r claude-skills-journalism/dev-toolkit/skills/context-engineering-fundamentals ~/.claude/skills/
  5. Restart Claude Code and confirm the skill appears in your skills list.
  6. Trigger it by saying something like "this session is long and Claude keeps ignoring my earlier instructions."
View source on GitHub ↗License: MIT