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Agent skill

Shard

by cwinvestments in cwinvestments/memstack

A skill your agent uses when the user says 'shard this', 'split file', or when working with files over 1000 lines.

MITAuto-check passedDevelopment

Install Shard

skills CLI
$ npx skills add cwinvestments/memstack --skill shard -a claude-code

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

GitHub CLI
$ gh skill install cwinvestments/memstack shard --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/cwinvestments/memstack.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/shard .claude/skills/shard && 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
shard
GitHub stars
423
Token cost
~666 tokens
SKILL.md length
245 words
Files
1
Skills in repo
87
Repo updated
First seen
Licence
MIT

At a glance

A skill your agent uses when the user says 'shard this', 'split file', or when working with files over 1000 lines.

  • Works in 6 steps: Identify the target file and count lines → Analyze structure → Propose the split: present to user… → …
  • The user says shard this
  • SKILL.md covers Activation, Context Guard, Protocol and Inputs, plus 3 more sections
  • Calls npm

What it does

Shard is an agent skill from cwinvestments/memstack. Use when the user says 'shard this', 'split file', or when working with files over 1000 lines.

Its SKILL.md is about 670 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. The repository describes itself as: Structured skill framework for Claude Code. 130 skills, persistent memory, TokenStack compression, localhost dashboard with 3-agent runner, real-time streaming, MCP tools. The licence is MIT.

When your agent uses it

  • The user says shard this
  • Working with files over 1000 lines

Example prompts

  • “shard this”
  • “split file”
  • “/shard”

Workflow steps

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

  1. Identify the target file and count lines
  2. Analyze structure
  3. Propose the split: present to user BEFORE executing
  4. Execute the refactor
  5. Verify build
  6. Present result: new file structure with line counts

What it can do on your machine

Read from SKILL.md and the folder at commit 00370ce. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • npm

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

  • Network

    No URLs in SKILL.md. Its commands use npm, which can reach the network depending on how they are called.

    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

Shard loads about 666 tokens when it runs. Until then it costs about 25 tokens; SKILL.md has 245 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~25
When it runs · the whole SKILL.md, loaded when a task matches
~666

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 passed

The automated check found no risky patterns in SKILL.md.

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

The full file from cwinvestments/memstack at commit 00370ce, republished under its MIT licence (© cwinvestments). 245 words, ~666 tokens.

Download SKILL.mdSave it as .claude/skills/shard/SKILL.md (or your agent's skills folder).
name
shard
description
Use when the user says 'shard this', 'split file', or when working with files over 1000 lines.
version
1.0.0

💎 Shard: Refactoring Large File...

Split monolithic files into focused, maintainable modules.

Activation

When this skill activates, output:

💎 Shard: Refactoring large file...

Then execute the protocol below.

Context Guard

ContextStatus
User says "shard", "split file", or "refactor"ACTIVE: full protocol
Editing a file over 1000 linesACTIVE: suggest refactor
User says "refactor" for logic changes (not splitting)DORMANT: not a shard task
Discussing code organization conceptsDORMANT: do not activate
File is under 500 linesDORMANT: not worth splitting

Protocol

  1. Identify the target file and count lines:

    bash
    wc -l <file>

  2. Analyze structure:

    • List all exports (functions, components, types, constants)
    • Identify logical groupings
    • Map internal dependencies (what calls what)

  3. Propose the split: present to user BEFORE executing:

    • Target: 100-300 lines per new file
    • Group related functionality
    • Keep types near consumers
    • Shared utilities in separate file

  4. Execute the refactor:

    • Create new files with proper names
    • Move code to appropriate files
    • Add import/export statements
    • Create index.ts barrel if needed for backwards compatibility
    • Update all imports throughout the project

  5. Verify build:

    bash
    npm run build 2>&1 | tail -20

  6. Present result: new file structure with line counts

Inputs

  • File path to refactor
  • Optional: preferred split strategy or target file count

Outputs

  • Multiple smaller files replacing the original
  • Updated imports throughout project
  • Build verification

Example Usage

User: "shard infrastructure/page.tsx: it's 1100 lines"

💎 Shard: Refactoring large file...

infrastructure/page.tsx (1,110 lines) → 6 files:
  page.tsx         (~120 lines), Main page, tab switcher
  RailwayTab.tsx   (~200 lines), Railway monitoring
  HetznerTab.tsx   (~180 lines), Hetzner monitoring
  HeadroomTab.tsx  (~250 lines), Headroom + setup guide
  types.ts         (~80 lines),   Shared interfaces
  constants.ts     (~60 lines):   Status configs

Build check: ✓ passed

Level History

  • Lv.1: Base: File analysis and splitting with import updates. (Origin: MemStack v1.0, Feb 2026)
  • Lv.2: Enhanced: Added YAML frontmatter, context guard, propose-before-execute, activation message. (Origin: MemStack v2.0 MemoryCore merge, Feb 2026)

© cwinvestments, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in skills/shard of cwinvestments/memstack.

Open the folder on GitHubat commit 00370ce

Compare with similar skills

Shard 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.

Shard compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Shard this skillcwinvestments/memstack423—~666Automated safety check: PassMIT
Vercel Composition Patternssupabase/supabase111k58 repos~726Automated safety check: PassMIT
Finishing a Development Branchobra/superpowers297k5 repos~1.9kAutomated safety check: PassMIT
Typescript Advanced Typesrolling-scopes/rsschool-app10k25 repos~4.2kAutomated safety check: PassMPL-2.0
PR Babysitteropeninterpreter/openinterpreter69k3 repos~4.2kAutomated safety check: PassApache-2.0
Code Review ChecklistshareAI-lab/learn-claude-code78k4 repos~1.1kAutomated safety check: PassMIT

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Categories

Questions about Shard

What does Shard do?

A skill your agent uses when the user says 'shard this', 'split file', or when working with files over 1000 lines. Shard is an agent skill from cwinvestments/memstack. Use when the user says 'shard this', 'split file', or when working with files over 1000 lines.

When should I use Shard?

Shard fits situations like: the user says shard this; working with files over 1000 lines.

How do I install Shard in Claude Code?

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

How do I install Shard in Codex?

Run `npx skills add cwinvestments/memstack --skill shard -a codex`. Or copy the skill folder (skills/shard in cwinvestments/memstack) into .agents/skills/shard in your project. Codex loads it when a task matches its description.

Can I use Shard 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 cwinvestments/memstack --skill shard -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/shard, .gemini/skills/shard, .github/skills/shard and .opencode/skills/shard in your project.

What does Shard need to run?

Going by SKILL.md and its folder, Shard needs the command-line tools its instructions call (npm).

Does Shard access the network?

SKILL.md contains no URLs. Its commands use npm, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Shard safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Shard use?

Shard is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Shard use?

About 666 tokens (SKILL.md is roughly 2.7k 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 Shard?

Skills that share tags, products or a category with Shard: Vercel Composition Patterns (supabase/supabase, 111k stars), Finishing a Development Branch (obra/superpowers, 297k stars), Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars) and PR Babysitter (openinterpreter/openinterpreter, 69k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Shard?

cwinvestments (a GitHub user) maintains it in cwinvestments/memstack, which has 423 GitHub stars. The repository holds 87 skills in this directory. The repository was last updated on September 26, 2026.

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