internals

A system-analysis skill that reviews a codebase using production-oriented patterns from Claude Code, an AI coding agent.

In plain words
What is it for?
Use it to audit those areas of a codebase against the listed Claude Code patterns.
Why use it?
It helps identify concerns in how software manages context, permissions, security, agents, tools, APIs, and prompts.

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/thtskaran/claude-code-analysis/internals
Any agent
npx skills add thtskaran/claude-code-analysis --skill internals
Clone the repo
git clone --depth 1 https://github.com/thtskaran/claude-code-analysis

Made for: Claude Code, Codex.

Per session 159 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,330 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 1 finding. 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 $0.00159 $0.02330
Opus 5 $0.00079 $0.01165
Sonnet 5 $0.00032 $0.00466
Haiku 4.5 $0.00016 $0.00233

Measured yesterday against content hash 4f3631d1771b, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade C, and why

internals scanned grade C with 1 finding 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 yesterday.

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.

Hidden instructionshighPrompt injection

Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.

<!-- Things the user's system lacks that Anthropic's handles -->
.claude/skills/internals/SKILL.md · 227 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. yesterday First seen · 227 lines · 159 tokens per session scan C 4f3631d1771b

Subscribe to this mod's changes

internals is a skill published in the GitHub repository thtskaran/claude-code-analysis (126 stars, last pushed 5mo ago), with no licence file. It adds 159 tokens to every session and 2,330 once invoked, about $0.0008 per session on Opus 5. A static security scan graded it C with 1 finding (hidden instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.