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Agent skill

Lc Again

by yennanliu in yennanliu/CS_basics

Move a problem's README status cell after a re-solve — promote AGAIN to OK when it was genuinely re-derived unaided, add a review pass when it was not, or demote OK back to AGAIN when a solid…

No licenceAuto-check: notesDevelopment

Install Lc Again

skills CLI
$ npx skills add yennanliu/CS_basics --skill lc-again -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install yennanliu/CS_basics lc-again --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/yennanliu/CS_basics.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/lc-again .claude/skills/lc-again && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
lc-again
GitHub stars
141
Token cost
~2.4k tokens
SKILL.md length
1,220 words
Files
1
Skills in repo
16
Repo updated
First seen
Licence
None found

At a glance

Move a problem's README status cell after a re-solve — promote AGAIN to OK when it was genuinely re-derived unaided, add a review pass when it was not, or demote OK back to AGAIN when a solid…

  • Works in 6 steps: Find the row and read the cell → Establish what actually happened → Make the edit → …
  • Asked to mark a problem solid
  • SKILL.md covers Why this exists, What the cell actually means, Prime directives and The three moves, plus 3 more sections
  • Calls python3 and bash

What it does

Lc Again is an agent skill from yennanliu/CS_basics. Move a problem's README status cell after a re-solve — promote AGAIN to OK when it was genuinely re-derived unaided, add a review pass when it was not, or demote OK back to AGAIN when a solid problem comes back. Keeps the trailing run, which is the recorded pass count that the cost curve and the review planner both read, and refreshes data/againproblems.txt. Use when asked to mark a problem solid, to graduate an AGAIN marker, to record another failed pass, or to update the status column after drilling something…

Its SKILL.md is about 2.4k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development, covering Technical documentation. The repository describes itself as: My CS learning : algorithm, data structure, and system design | SE.

When your agent uses it

  • Asked to mark a problem solid
  • Graduate an AGAIN marker
  • Record another failed pass
  • Update the status column after drilling something

Example prompts

  • “I finally got 128, mark it OK”
  • “/lc-again 139”
  • “promote 1143 to OK”
  • “/lc-again”

Requirements

  • Python 3
  • Pre-approved tools (allowed-tools): Read, Glob, Grep, Bash, Write, Edit

Workflow steps

6 steps, taken from the step headings in SKILL.md.

  1. Find the row and read the cell
  2. Establish what actually happened
  3. Make the edit
  4. Refresh the derived list
  5. Check the tooling still reads the row
  6. Report

What it can do on your machine

Read from SKILL.md and the folder at commit cb6b21b. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Read
    • Glob
    • Grep
    • Bash
    • Write
    • Edit

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • python3
    • bash

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Lc Again loads about 2.4k tokens when it runs. Until then it costs about 166 tokens; SKILL.md has 1,220 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~166
When it runs · the whole SKILL.md, loaded when a task matches
~2.4k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

  • NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
    allowed-tools: Read, Glob, Grep, Bash, Write, Edit

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Without a licence we can't republish the file, so here is its outline and opening line. It has 1,220 words (~2,420 tokens).

“Edit the status column of a problem's README row after a re-solve, and refresh data/again_problems.txt.”

— opening of SKILL.md by yennanliu
name
lc-again
allowed-tools
Read, Glob, Grep, Bash, Write, Edit

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .claude/skills/lc-again of yennanliu/CS_basics.

Open the folder on GitHubat commit cb6b21b

Compare with similar skills

Lc Again next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Lc Again compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Lc Again this skillyennanliu/CS_basics141—~2.4kAutomated safety check: NotesNone
Diagram Designcathrynlavery/diagram-design48k1 repos~7.6kAutomated safety check: PassMIT
Simple Englishmoeru-ai/airi50k2 repos~4.6kAutomated safety check: PassMIT
Doc SyncJetBrains/ideavim10k2 repos~2.6kAutomated safety check: PassMIT
Mailspring App ScreenshotsFoundry376/Mailspring18k—~1.5kAutomated safety check: PassGPL-3.0
Draw.io Diagram StudioAgents365-ai/drawio-skill10k—~2.4kAutomated safety check: NotesMIT

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  • Lc Algo Demo

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  • Lc Cheatsheet

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  • Lc Discussion

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Categories

Questions about Lc Again

What does Lc Again do?

Move a problem's README status cell after a re-solve — promote AGAIN to OK when it was genuinely re-derived unaided, add a review pass when it was not, or demote OK back to AGAIN when a solid…. Lc Again is an agent skill from yennanliu/CS_basics. Move a problem's README status cell after a re-solve — promote AGAIN to OK when it was genuinely re-derived unaided, add a review pass when it was not, or demote OK back to AGAIN when a solid problem comes back.

When should I use Lc Again?

Lc Again fits situations like: asked to mark a problem solid; graduate an AGAIN marker; record another failed pass; update the status column after drilling something.

How do I install Lc Again in Claude Code?

Run `npx skills add yennanliu/CS_basics --skill lc-again -a claude-code`. Or copy the skill folder (.claude/skills/lc-again in yennanliu/CS_basics) into .claude/skills/lc-again in your project. Claude Code loads it when a task matches its description.

How do I install Lc Again in Codex?

Run `npx skills add yennanliu/CS_basics --skill lc-again -a codex`. Or copy the skill folder (.claude/skills/lc-again in yennanliu/CS_basics) into .agents/skills/lc-again in your project. Codex loads it when a task matches its description.

Can I use Lc Again in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add yennanliu/CS_basics --skill lc-again -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/lc-again, .gemini/skills/lc-again, .github/skills/lc-again and .opencode/skills/lc-again in your project.

What does Lc Again need to run?

Going by SKILL.md and its folder, Lc Again needs the command-line tools its instructions call (python3 and bash). Our summary lists: Python 3. Its frontmatter pre-approves these tools: Read, Glob, Grep, Bash, Write, Edit.

Does Lc Again access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Lc Again safe to install?

Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Lc Again use?

No licence was found for Lc Again or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does Lc Again use?

About 2.4k tokens (SKILL.md is roughly 9.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Lc Again?

Skills that share tags, products or a category with Lc Again: Diagram Design (cathrynlavery/diagram-design, 48k stars), Simple English (moeru-ai/airi, 50k stars), Doc Sync (JetBrains/ideavim, 10k stars) and Mailspring App Screenshots (Foundry376/Mailspring, 18k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Lc Again?

yennanliu (a GitHub user) maintains it in yennanliu/CS_basics, which has 141 GitHub stars. The repository holds 16 skills in this directory. The repository was last updated on October 10, 2026.

Source: yennanliu/CS_basics on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.