context-engineering

A set of practices for organizing and repairing the information an coding agent uses about a project, such as rules, handoff notes, and recovery prompts.

In plain words
What is it for?
Use it to maintain AGENTS.md files and project rules, prepare handoffs, recover after context is shortened, switch between large workstreams, and investigate off-pattern or made-up results.
Why use it?
It helps prevent the agent from losing important instructions, getting confused after switching work, or producing behavior that does not match the project.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/bish-x/bx-dev-skill/context-engineering
Any agent
npx skills add bish-x/bx-dev-skill --skill context-engineering
Clone the repo
git clone --depth 1 https://github.com/bish-x/bx-dev-skill

Made for: Claude Code, Codex.

Per session 70 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,368 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown 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 $0.00070 $0.02368
Opus 5 $0.00035 $0.01184
Sonnet 5 $0.00014 $0.00474
Haiku 4.5 $0.00007 $0.00237

Measured 2d ago against content hash e63be0d34fae, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, 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 2d 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.

skills/bx-dev/skill-library/engineering/context-engineering/SKILL.md · 290 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. 2d ago First seen · 290 lines · 70 tokens per session scan A e63be0d34fae

Subscribe to this mod's changes

context-engineering is a skill published in the GitHub repository bish-x/bx-dev-skill (23 stars, last pushed 2mo ago), with no licence file. It adds 70 tokens to every session and 2,368 once invoked, about $0.0003 per session on Opus 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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