agentmods.dev

Writing Evergreen Comments

Writing Evergreen Comments is a skill for Claude Code from obra/clank. It costs 16 tokens per session (1,636 once invoked), scanned A, original, no licence file.

A guideline for writing code comments that explain what the code does and why it exists. It avoids comments about temporary history or when a change was made.

In plain words
What is it for?
Use it when adding or revising comments in source code, especially around non-obvious decisions or behavior.
Why use it?
It keeps comments useful as the code changes instead of letting them become outdated.

Skill for Claude Code

Written for Claude Code: when-to-use in frontmatter.

not rated 43repo +1 1y ago A scan 16 tokens no licence

Good fit Use it when adding or revising comments in source code, especially around non-obvious decisions or behavior.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/obra/clank/writing-evergreen-comments
View source ↗ obra/clank
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 obra/clank --skill writing-evergreen-comments
Clone the repo
git clone --depth 1 https://github.com/obra/clank

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 Writing Evergreen Comments

README.md
[![agentmods](https://agentmods.dev/badge/skills/obra/clank/writing-evergreen-comments/github.svg)](https://agentmods.dev/skills/obra/clank/writing-evergreen-comments)
Your own site
<a href="https://agentmods.dev/skills/obra/clank/writing-evergreen-comments"><img src="https://agentmods.dev/badge/skills/obra/clank/writing-evergreen-comments/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 Writing Evergreen Comments

Your own site · 80×15
<a href="https://agentmods.dev/skills/obra/clank/writing-evergreen-comments"><img src="https://agentmods.dev/badge/skills/obra/clank/writing-evergreen-comments.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 16 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,636 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 $0.00016 $0.01636
Opus 5.5 $0.00006 $0.00654
Sonnet 5.5 $0.00003 $0.00327
Haiku 4.5 $0.00002 $0.00164

Measured 2mo ago against content hash 46ac43c4fd1d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

Writing Evergreen Comments 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 2mo 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/coding/writing-evergreen-comments/SKILL.md · 284 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. 2mo ago First seen · 284 lines · 16 tokens per session scan A 46ac43c4fd1d

Subscribe to this mod's changes

Writing Evergreen Comments is a skill published in the GitHub repository obra/clank (43 stars, last pushed 1y ago), with no licence file. It adds 16 tokens to every session and 1,636 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 2026-08-30.

Writing and docs
Related

Writing Evergreen Comments compared with skills from other repositories

Writing Evergreen Comments next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
Writing Evergreen Commentsobra/clankSkill431y agononeA16Claude Code
imagegenopenai/codexSkill134ktodayApache-2.0A113Codex
local-ai-agentsmicrosoft/ai-agents-for-beginnersSkill79k3d agoMITA200Claude Code, Codex
playwright-climicrosoft/playwrightSkill100ktodayApache-2.0A19Claude Code
browser-automationopenclaw/openclawSkill394ktodayMITA36Claude Code
systematic-debuggingobra/superpowersSkill315k6d agoMITA21Claude Code
next-cache-components-adoptionvercel/next.jsSkill143ktodayMITA95Claude Code