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rationale

rationale is a skill for Claude Code from mtrdesign/whygraph. It costs 28 tokens per session (426 once invoked), scanned A, original, no licence file.

A read-only explanation of why a piece of code exists, including its purpose, constraints, tradeoffs, and risks. A code chunk is a selected section of source code.

In plain words
What is it for?
Use it to look up the rationale for a selected code section.
Why use it?
It helps you understand the reasoning around code without changing the code itself.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

not rated 4repo changed 5d ago A scan 28 tokens no licence

Good fit Use it to look up the rationale for a selected code section.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/mtrdesign/whygraph/rationale
View source ↗ mtrdesign/whygraph
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 mtrdesign/whygraph --skill rationale
Clone the repo
git clone --depth 1 https://github.com/mtrdesign/whygraph

Made for: Claude Code.

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 rationale

README.md
[![agentmods](https://agentmods.dev/badge/skills/mtrdesign/whygraph/rationale/github.svg)](https://agentmods.dev/skills/mtrdesign/whygraph/rationale)
Your own site
<a href="https://agentmods.dev/skills/mtrdesign/whygraph/rationale"><img src="https://agentmods.dev/badge/skills/mtrdesign/whygraph/rationale/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 rationale

Your own site · 80×15
<a href="https://agentmods.dev/skills/mtrdesign/whygraph/rationale"><img src="https://agentmods.dev/badge/skills/mtrdesign/whygraph/rationale.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 28 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 426 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 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 5.1 $0.00028 $0.00426
Opus 5.5 $0.00011 $0.00170
Sonnet 5.5 $0.00006 $0.00085
Haiku 4.5 $0.00003 $0.00043

Measured 5d ago against content hash dc7ecbd199cb, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

rationale 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.

src/whygraph/assets/claude-code/skills/rationale/SKILL.md · 26 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. 5d ago Changed · +2 lines dc7ecbd199cb
  2. 22d ago Changed 7cf7ea716e82
  3. 2mo ago First seen · 24 lines · 28 tokens per session scan A 6f24ac436c97

Subscribe to this mod's changes

rationale is a skill published in the GitHub repository mtrdesign/whygraph (4 stars, last pushed today), with no licence file. It adds 28 tokens to every session and 426 once invoked, about $0.0001 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.

Claude CodeCode reviewcodegraphmcp-server
Related

rationale compared with skills from other repositories

rationale next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
rationalemtrdesign/whygraphSkill4todaynoneA28Claude Code
codegraphlzehrung/codegraphSkill9yesterdayMITA30Claude Code, Codex
code-reviewlzehrung/codegraphSkill9yesterdayMITA12Claude Code, Codex
pull-request-authoringgithub/github-mcp-serverSkill34kyesterdayMITA62Claude Code, Codex
trace-mcp-refactoringnikolai-vysotskyi/trace-mcpSkill204yesterdayMITA39Claude Code
git-workflowmodelcontextprotocol/csharp-sdkSkill4.6k3d agononeA19Claude Code, Codex
m1nd-firstmaxkle1nz/m1ndSkill242d agoMITA78Claude Code