improve-codebase-architecture

improve-codebase-architecture is a skill for Claude Code from toBzh30/Claude-Project-Bootstrap. It costs 80 tokens per session (1,219 once invoked), scanned A, a copy of improve-codebase-architecture, MIT.

A skill for finding ways to improve how a codebase is structured and how its modules interact.

In plain words
What is it for?
Use it to review architecture, identify refactoring opportunities, consolidate related modules, and make code more testable.
Why use it?
It exposes tightly connected or hard-to-test code and suggests changes that make future work easier to understand and localize.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the engineering-craft plugin — 9 skills 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/tobzh30/claude-project-bootstrap/improve-codebase-architecture
Any agent
npx skills add toBzh30/Claude-Project-Bootstrap --skill improve-codebase-architecture
Clone the repo
git clone --depth 1 https://github.com/toBzh30/Claude-Project-Bootstrap

Made for: Claude Code.

Or install engineering-craft, the plugin that ships this one along with the rest of its 9 skills.

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 improve-codebase-architecture

README.md
[![agentmods](https://agentmods.dev/badge/skills/tobzh30/claude-project-bootstrap/improve-codebase-architecture.svg)](https://agentmods.dev/skills/tobzh30/claude-project-bootstrap/improve-codebase-architecture)
Your own site
<a href="https://agentmods.dev/skills/tobzh30/claude-project-bootstrap/improve-codebase-architecture"><img src="https://agentmods.dev/badge/skills/tobzh30/claude-project-bootstrap/improve-codebase-architecture.svg" alt="Measured on agentmods" height="20"></a>
Per session 80 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,219 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 69% copy Near-identical to another mod 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 5.1 $0.00080 $0.01219
Opus 5 $0.00040 $0.00609
Sonnet 5 $0.00016 $0.00244
Haiku 4.5 $0.00008 $0.00122

Measured 5d ago against content hash 1ea32df90d8c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

improve-codebase-architecture 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.

Origin

This is a copy

69% identical to improve-codebase-architecture — 78 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

plugins/engineering-craft/skills/improve-codebase-architecture/SKILL.md · 72 lines

How it starts

The opening of the file, as written. The whole thing — 72 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Improve Codebase Architecture

Surface architectural friction and propose deepening opportunities — refactors that turn shallow modules into deep ones. The aim is testability and AI-navigability.

Glossary

Use these terms exactly in every suggestion. Consistent language is the point — don't drift into "component," "service," "API," or "boundary." Full definitions in LANGUAGE.md.

  • Module — anything with an interface and an implementation (function, class, package, slice).
  • Interface — everything a caller must know to use the module: types, invariants, error modes, ordering, config. Not just the type signature.
  • Implementation — the code inside.
  • Depth — leverage at the interface: a lot of behaviour behind a small interface. Deep = high leverage. Shallow = interface nearly as complex as the implementation.
  • Seam — where an interface lives; a place behaviour can be altered without editing in place. (Use this, not "boundary.")
  • Adapter — a concrete thing satisfying an interface at a seam.
  • Leverage — what callers get from depth.
  • Locality — what maintainers get from depth: change, bugs, knowledge concentrated in one place.

Key principles (see LANGUAGE.md for the full list):

  • Deletion test: imagine deleting the module. If complexity vanishes, it was a pass-through. If complexity reappears across N callers, it was earning its keep.
  • The interface is the test surface.
  • One adapter = hypothetical seam. Two adapters = real seam.

This skill is informed by the project's domain model. The domain language gives names to good seams; the decision log records what the skill should not re-litigate.

Process

1. Explore

Read the project's domain glossary (.claude/rules/glossary.md) and any decisions in .claude/rules/decisions.md for the area you're touching first.

Then use the Agent tool with subagent_type=Explore to walk the codebase. Don't follow rigid heuristics — explore organically and note where you experience friction:

Read the full file on GitHub · 72 lines

Files

What ships with it

3 files 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. 5d ago First seen · 72 lines · 80 tokens per session scan A 1ea32df90d8c

Subscribe to this mod's changes

improve-codebase-architecture is a skill published in the GitHub repository toBzh30/Claude-Project-Bootstrap (3 stars, last pushed 1mo ago), licensed MIT. It adds 80 tokens to every session and 1,219 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. It is 69% identical to improve-codebase-architecture, differing in 78 lines, and is treated as a copy.

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