Agent skill

Lc Coach

by yennanliu in yennanliu/CS_basics

FAANG coding-interview coach. An agent skill from yennanliu/CS_basics.

No licenceAuto-check: notesBusiness, Finance & HR

Install Lc Coach

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

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

GitHub CLI
$ gh skill install yennanliu/CS_basics lc-coach --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-coach .claude/skills/lc-coach && 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-coach
GitHub stars
141
Token cost
~5k tokens
SKILL.md length
2,496 words
Files
5 (incl. references)
Skills in repo
16
Repo updated
First seen
Licence
None found

At a glance

FAANG coding-interview coach. An agent skill from yennanliu/CS_basics.

  • Works in 5 steps: Verdict first. Open with the hire signal… → Smallest sufficient hint. Climb the… → Correctness outranks cleverness. An O(n… → …
  • Debriefing a LeetCode-style SWE interview — review my solution
  • SKILL.md covers Prime directives, The four signals, Modes and Default loop — Review, plus 7 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Lc Coach is an agent skill from yennanliu/CS_basics. FAANG coding-interview coach. Scores a solution the way an interviewer does on the six-point scale (SH/H/LH/LNH/NH/SNH), writes the debrief packet from the interviewer's side of the table, teaches the DSA fundamentals underneath, dry-runs code out loud, names the one line that blocks the optimal complexity, and recommends the sibling problems to drill next. Use when preparing for or debriefing a LeetCode-style SWE interview — "review my solution", "would this pass?", "what's my verdict?", "how would an…

Its SKILL.md is about 5k tokens, which your agent loads only when the skill is triggered. The skill folder holds 5 other files, including reference files (for example `INSTALL.md`, `references/patterns.md` and `references/rubric.md`).

It sits in Business, Finance & HR, covering Interview preparation. The repository describes itself as: My CS learning : algorithm, data structure, and system design | SE.

When your agent uses it

  • Debriefing a LeetCode-style SWE interview — review my solution
  • Would this pass?
  • Whats my verdict?
  • How would an interviewer see this?

Example prompts

  • “review my solution”
  • “would this pass?”
  • “s my verdict?”
  • “/lc-coach”

Requirements

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

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

  1. Verdict first. Open with the hire signal and the complexity gap. Never bury it under praise.
  2. Smallest sufficient hint. Climb the ladder below one rung at a time; stop the moment the candidate moves.
  3. Correctness outranks cleverness. An O(n log n) solution that is wrong scores below an O(n²) one that is right.
  4. Every claim is traced, not asserted. "This breaks" must come with the input that breaks it.
  5. One drill at a time. End every response with exactly one concrete next action.

What it can do on your machine

Read from SKILL.md and the folder at commit b6cade9. 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

    No scripts in the folder and no shell commands in SKILL.md.

    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 Coach loads about 5k tokens when it runs, and up to ~10k if it reads all its reference files. Until then it costs about 155 tokens; SKILL.md has 2,496 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~155
When it runs · the whole SKILL.md, loaded when a task matches
~5k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~10k

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 2,496 words (~4,963 tokens).

“You are a senior FAANG interviewer who also coaches. Two jobs, in this order: score honestly, then make the candidate able to do it unaided next time.”

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

Read the full SKILL.md on GitHub

Files

SKILL.md and 4 other files (references) in .claude/skills/lc-coach of yennanliu/CS_basics.

  • SKILL.md
  • INSTALL.md
  • references/patterns.md
  • references/rubric.md
  • references/talk-track.md

Open the folder on GitHubat commit b6cade9

Compare with similar skills

Lc Coach 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 Coach compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Lc Coach this skillyennanliu/CS_basics141—~5kAutomated safety check: NotesNone
Career-Ops Job Search Centercareer-ops-hq/career-ops74k—~3.6kAutomated safety check: PassMIT
Interview Prepreactive-resume/reactive-resume44k—~10kAutomated safety check: PassMIT
Internship Project Preparation ToolLiuMengxuan04/shushu-internship-tool2.1k—~2.3kAutomated safety check: PassCustom licence
Job Application Managerreactive-resume/reactive-resume44k—~13kAutomated safety check: PassMIT
Mock Interviewreactive-resume/reactive-resume44k—~11kAutomated safety check: PassMIT

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    74k GitHub stars~3.6k tokensUpdated today
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  • Interview Prep

    reactive-resume/reactive-resume

    Prepares the user for a specific interview from their real experience.

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  • Lc Cheatsheet

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  • Lc Discussion

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Questions about Lc Coach

What does Lc Coach do?

FAANG coding-interview coach. An agent skill from yennanliu/CS_basics. Lc Coach is an agent skill from yennanliu/CS_basics. FAANG coding-interview coach.

When should I use Lc Coach?

Lc Coach fits situations like: debriefing a LeetCode-style SWE interview — review my solution; would this pass?; whats my verdict?; how would an interviewer see this?.

How do I install Lc Coach in Claude Code?

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

How do I install Lc Coach in Codex?

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

Can I use Lc Coach 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-coach -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-coach, .gemini/skills/lc-coach, .github/skills/lc-coach and .opencode/skills/lc-coach in your project.

What does Lc Coach need to run?

SKILL.md names no scripts, command-line tools or credentials: Lc Coach is instructions for the agent only. Its frontmatter pre-approves these tools: Read, Glob, Grep, Bash, Write, Edit.

Does Lc Coach 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 Coach 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 Coach use?

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

How many tokens does Lc Coach use?

About 5k tokens (SKILL.md is roughly 20k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 5.5k tokens, read only when the agent opens those files.

What are the alternatives to Lc Coach?

Skills that share tags, products or a category with Lc Coach: Career-Ops Job Search Center (career-ops-hq/career-ops, 74k stars), Interview Prep (reactive-resume/reactive-resume, 44k stars), Internship Project Preparation Tool (LiuMengxuan04/shushu-internship-tool, 2.1k stars) and Job Application Manager (reactive-resume/reactive-resume, 44k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Lc Coach?

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 11, 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.