unpack

A plain-language explainer for unfamiliar ideas, documents, code, errors, and processes. It starts from basic principles and explains how the parts fit together.

In plain words
What is it for?
Use it to understand an unfamiliar codebase or document, decode an error, summarize material, or write precise instructions for another coding agent.
Why use it?
Dense technical material often assumes background knowledge the reader does not have. This helps turn confusing descriptions or failures into a clear understanding and an actionable explanation.

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/dotlas/skills/unpack
Any agent
npx skills add dotlas/skills --skill unpack
Clone the repo
git clone --depth 1 https://github.com/dotlas/skills

Made for: Claude Code, Codex.

Per session 111 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,861 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original 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 $0.00111 $0.01861
Opus 5 $0.00056 $0.00931
Sonnet 5 $0.00022 $0.00372
Haiku 4.5 $0.00011 $0.00186

Measured 2d ago against content hash 3a4a4bc22f06, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

unpack 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/custom/common/unpack/SKILL.md · 176 lines

How it starts

The opening of the file, as written. The whole thing — 176 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Unpack — Plain, First-Principles Explanations


When To Use

Use this when the user wants to understand something — a codebase, a document, a decision, a process, any unfamiliar mechanism — build intuition, decode an error, or translate intent into precise instructions for another agent.

  • The user may already be an expert elsewhere; they just don’t know this thing yet.
  • Don’t assume the topic is technical.

Procedures

Pick the situation first, then apply the principles below as the craft underneath it.

Situation Approach
Default Read what’s needed, then answer directly; don’t ask for context the source already gives.
Overview requested 4–6 sentences: what it’s for, the main pieces, how control/data moves end to end, how it’s validated. Discover this from the source.
Debugging (code) Read the error yourself, state what broke in one sentence, explain the mechanism that produced it, give a concrete fix.
Directing another agent (code) Translate intent into a precise instruction — name the exact files/tests to attach and the exact change to make, not a vague pointer.
Summarize requested Distil agent output or a findings dump into a structured brief — see summarize.md.

Output format

  • Open with the answer — first sentence is the answer, not a windup.
  • Prose by default — connected reasoning flows as prose; one idea per paragraph.
  • Table when comparing things across shared dimensions (e.g. this vs that).
  • Bullets for genuinely parallel, non-sequential items.
  • Never use structure to look thorough — reach for it only when the shape calls for it.

Not The Same Axis As Compression

Compression and this skill operate on different axes and can both run at once — they don’t compete.

Compression mode (e.g. terse/caveman) This skill
Changes the phrasing — same facts, order the shape — order, what’s earned
Goal fewer words less confusion

Read the full file on GitHub · 176 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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 · 176 lines · 111 tokens per session scan A 3a4a4bc22f06

Subscribe to this mod's changes

unpack is a skill published in the GitHub repository dotlas/skills (2 stars, last pushed 5d ago), licensed MIT. It adds 111 tokens to every session and 1,861 once invoked, about $0.0006 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 2026-08-31.

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