code-breaking-changes

A review guide for finding breaking changes in the ways software connects to other software. These connection points include app-server APIs, command-line options, configuration loading, and saved sessions that users resume later.

In plain words
What is it for?
Use it when changing an API, CLI parameter, configuration format, or session-resume behaviour, and when checking whether existing users or tools will still work.
Why use it?
It helps identify changes that can make existing scripts, integrations, settings, or saved work stop functioning. The review is intended to continue across all relevant connection points instead of stopping at the first issue.

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/chemany/mente/code-review-breaking-changes
Any agent
npx skills add chemany/Mente --skill code-review-breaking-changes
Clone the repo
git clone --depth 1 https://github.com/chemany/Mente

Made for: Claude Code, Codex.

Per session 7 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 62 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 100% 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 $0.00007 $0.00062
Opus 5 $0.00003 $0.00031
Sonnet 5 $0.00001 $0.00012
Haiku 4.5 $0.00001 $0.00006

Measured 2d ago against content hash 9981e74df2e8, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

code-breaking-changes 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.

Origin

This is a copy

100% identical to code-breaking-changes — 0 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.

kernel/codex/upstream/.codex/skills/code-review-breaking-changes/SKILL.md · 13 lines

What it actually says

Search for breaking changes in external integration surfaces:

  • app-server APIs
  • CLI parameters
  • configuration loading
  • resuming sessions from existing rollouts

Do not stop after finding one issue; analyze all possible ways breaking changes can happen.

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 · 13 lines · 7 tokens per session scan A 9981e74df2e8

Subscribe to this mod's changes

code-breaking-changes is a skill published in the GitHub repository chemany/Mente (11 stars, last pushed 3mo ago), licensed MIT. It adds 7 tokens to every session and 62 once invoked, about $0.0000 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to code-breaking-changes, differing in 0 lines, and is treated as a copy.

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