logical-reasoning

logical-reasoning is a skill for Claude Code from i-stack/ai-coding-kit. It costs 48 tokens per session (667 once invoked), scanned A, original, MIT.

A reasoning skill that requires a traceable link between evidence, inference, conclusion, and uncertainty.

In plain words
What is it for?
Explaining technical judgments, design trade-offs, root-cause analysis, performance findings, and code-review conclusions.
Why use it?
It reduces unsupported cause-and-effect claims and makes gaps or unverified assumptions visible.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: reads .claude/ paths.

Part of the skills-engineering plugin — 10 skills shipped together

Good fit Explaining technical judgments, design trade-offs, root-cause analysis, performance findings, and code-review conclusions.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/i-stack/ai-coding-kit/logical-reasoning
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.

Any agent
npx skills add i-stack/ai-coding-kit --skill logical-reasoning
Clone the repo
git clone --depth 1 https://github.com/i-stack/ai-coding-kit

Made for: Claude Code.

Or install skills-engineering, the plugin that ships this one along with the rest of its 10 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 logical-reasoning

README.md
[![agentmods](https://agentmods.dev/badge/skills/i-stack/ai-coding-kit/logical-reasoning/github.svg)](https://agentmods.dev/skills/i-stack/ai-coding-kit/logical-reasoning)
Your own site
<a href="https://agentmods.dev/skills/i-stack/ai-coding-kit/logical-reasoning"><img src="https://agentmods.dev/badge/skills/i-stack/ai-coding-kit/logical-reasoning/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for logical-reasoning

Your own site · 80×15
<a href="https://agentmods.dev/skills/i-stack/ai-coding-kit/logical-reasoning"><img src="https://agentmods.dev/badge/skills/i-stack/ai-coding-kit/logical-reasoning.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 48 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 667 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00048 $0.00667
Opus 5.5 $0.00019 $0.00267
Sonnet 5.5 $0.00010 $0.00133
Haiku 4.5 $0.00005 $0.00067

Measured 1mo ago against content hash 0105d68a71e9, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

logical-reasoning 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 1mo 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-engineering/logical-reasoning/SKILL.md · 33 lines

What it actually says

Logical Reasoning

强制入口

命中本 skill 时,必须先完整阅读 references/logical_reasoning.md 并按其中条款执行。

  • 不得以 preamble、Cursor 规则摘要或其它二次摘要代替该文件全文。
  • 同步依赖:本 skill 在「与认知对手模式的分工」中通过相对路径引用 ../ios-engineer/references/cognitive_adversary_mode.md;同步到各端时,需确保 ios-engineer skill 也同步到同层 skills 目录(如 ~/.claude/skills/ios-engineer),否则该链接失效。条件性:该链接仅在 ios-engineer 已同步到同层 skills 目录时可达;非 iOS 环境(未同步 ios-engineer)下,本 skill 的 GR-010 约束本身完整可用,仅"与认知对手模式分工"的跳转链接失效,不影响核心论证纪律。

GR-010 核心规则

  • [GR-010] 回复必须具备可追溯的逻辑链;须区分「事实 / 推断 / 建议 / 推测」,不得把未验证推断写成定论;禁止无依据的因果跳跃、循环论证、同一回复内自相矛盾;非显然判断至少标出一步「因为…所以…」;证据不足时标明不确定,不得用流畅措辞伪装确定性。高风险判断时输出须包含独立「逻辑链」块,字段为:事实/证据、推断、结论强度、可证伪/缺口。细则见 logical_reasoning.md。

何时加载

  • 默认:所有含判断成分的任务。
  • 必须输出逻辑链块:技术决策、架构取舍、根因归因、性能归因、审查最终判断、用户强烈确信或显式要求挑战观点。
  • 跳过:纯机械执行、无任何判断成分的任务。

与认知对手模式的分工

角色 目标 典型触发
认知对手模式(ios-engineer) 校准:挑战用户结论的逻辑与假设 技术决策、强确信、显式 red team
本 skill(GR-010) 约束:AI 自身的论证质量 所有含判断成分的回复
Files

What ships with it

7 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. 1mo ago First seen · 33 lines · 48 tokens per session scan A 0105d68a71e9

Subscribe to this mod's changes

logical-reasoning is a skill published in the GitHub repository i-stack/ai-coding-kit (3 stars, last pushed 23d ago), licensed MIT. It adds 48 tokens to every session and 667 once invoked, about $0.0002 per session on Opus 5.5. 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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