decomposition

decomposition is a skill for Claude Code, Codex from bfollington/terma. It costs 94 tokens per session (1,206 once invoked), scanned A, original, CC-BY-SA-4.0.

A decomposition skill for deciding where system boundaries should go, such as between modules, services, processes, or packages. It considers which structure best isolates changes.

In plain words
What is it for?
Use it when splitting a large file, extracting shared code, restructuring a system, or deciding whether parts should be merged, separated, or left duplicated.
Why use it?
It helps avoid refactors that merely make code look tidy while making future changes harder to contain.

Skill for Claude CodeCodex

Part of the terma plugin — 18 skills, 6 agents shipped together

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

Made for: Claude Code, Codex.

Or install terma, the plugin that ships this one along with the rest of its 18 skills, 6 agents.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for decomposition

README.md
[![agentmods](https://agentmods.dev/badge/skills/bfollington/terma/decomposition.svg)](https://agentmods.dev/skills/bfollington/terma/decomposition)
Your own site
<a href="https://agentmods.dev/skills/bfollington/terma/decomposition"><img src="https://agentmods.dev/badge/skills/bfollington/terma/decomposition.svg" alt="Measured on agentmods" height="20"></a>
Per session 94 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,206 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 $0.00094 $0.01206
Opus 5 $0.00047 $0.00603
Sonnet 5 $0.00019 $0.00241
Haiku 4.5 $0.00009 $0.00121

Measured 5d ago against content hash e09ec09e0fa8, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

decomposition 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 5d 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.

plugins/terma/skills/decomposition/SKILL.md · 85 lines

The source is not reproduced here

Licensed CC-BY-SA-4.0

The repository is licensed CC-BY-SA-4.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

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. 5d ago First seen · 85 lines · 94 tokens per session scan A e09ec09e0fa8

Subscribe to this mod's changes

decomposition is a skill published in the GitHub repository bfollington/terma (51 stars, last pushed 5d ago), licensed CC-BY-SA-4.0. It adds 94 tokens to every session and 1,206 once invoked, about $0.0005 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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