MCP Server Builder
anthropics/skills
Guides the design and implementation of Model Context Protocol servers in TypeScript or Python, from tool naming and error messages to evaluation.
Coding Agent System - unified memory, tasks, rules, and skills.
Install Cas
$ npx skills add codingagentsystem/cas --skill cas -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install codingagentsystem/cas cas --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/codingagentsystem/cas.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/cas .claude/skills/cas && rm -rf skills-srcUse ~/.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/
Install the "cas" agent skill from https://github.com/codingagentsystem/cas/tree/main/.claude/skills/cas into .claude/skills/cas/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cas", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/codingagentsystem/cas/tree/main/.claude/skills/casType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add codingagentsystem/cas --skill cas -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install codingagentsystem/cas cas --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/codingagentsystem/cas.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/cas .agents/skills/cas && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "cas" agent skill from https://github.com/codingagentsystem/cas/tree/main/.claude/skills/cas into .agents/skills/cas/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cas", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add codingagentsystem/cas --skill cas -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install codingagentsystem/cas cas --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/codingagentsystem/cas.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/cas .cursor/skills/cas && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "cas" agent skill from https://github.com/codingagentsystem/cas/tree/main/.claude/skills/cas into .cursor/skills/cas/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cas", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/codingagentsystem/cas.git --path .claude/skills/cas--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add codingagentsystem/cas --skill cas -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install codingagentsystem/cas cas --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/codingagentsystem/cas.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/cas .gemini/skills/cas && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "cas" agent skill from https://github.com/codingagentsystem/cas/tree/main/.claude/skills/cas into .gemini/skills/cas/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cas", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install codingagentsystem/cas casInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add codingagentsystem/cas --skill cas -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/codingagentsystem/cas.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/cas .github/skills/cas && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "cas" agent skill from https://github.com/codingagentsystem/cas/tree/main/.claude/skills/cas into .github/skills/cas/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cas", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add codingagentsystem/cas --skill cas -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install codingagentsystem/cas cas --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/codingagentsystem/cas.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/cas .opencode/skills/cas && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "cas" agent skill from https://github.com/codingagentsystem/cas/tree/main/.claude/skills/cas into .opencode/skills/cas/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cas", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
cas- GitHub stars
- 176
- Token cost
- ~723 tokens
- SKILL.md length
- 338 words
- Files
- 1
- Skills in repo
- 7
- Repo updated
- First seen
- Licence
- MIT
At a glance
Coding Agent System - unified memory, tasks, rules, and skills.
- You need to remember something
- SKILL.md covers WHEN TO USE CAS (ALWAYS), Task Tools (USE INSTEAD OF…, Memory Tools and Search Tools, plus 2 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Search past context
What it does
Cas is an agent skill from codingagentsystem/cas. Coding Agent System - unified memory, tasks, rules, and skills. Use when you need to remember something, track work, search past context, or manage tasks. (project)
Its SKILL.md is about 720 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 Agent Workflows. It works with Model Context Protocol. The repository describes itself as: Multi-agent orchestration for Claude Code. Persistent memory, tasks, rules, and skills that make AI agents actually coordinate. The licence is MIT.
When your agent uses it
- You need to remember something
- Search past context
Example prompts
- “/cas”
What it can do on your machine
Read from SKILL.md and the folder at commit a0a4b5a. 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
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
Cas loads about 723 tokens when it runs. Until then it costs about 42 tokens; SKILL.md has 338 words of instructions outside code blocks.
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 codingagentsystem/cas at commit a0a4b5a, republished under its MIT licence (© codingagentsystem). 338 words, ~723 tokens.
Download SKILL.mdSave it as
.claude/skills/cas/SKILL.md (or your agent's skills folder).- name
- cas
- description
- Coding Agent System - unified memory, tasks, rules, and skills. Use when you need to remember something, track work, search past context, or manage tasks. (project)
- managed_by
- cas
CAS - Coding Agent System
IMPORTANT: Use CAS MCP tools instead of built-in tools for task and memory management.
CAS provides persistent memory and task management across sessions. Built-in tools like TodoWrite are ephemeral and don't persist.
WHEN TO USE CAS (ALWAYS)
- Task tracking: Use
mcp__cas__taskwith action: create instead of TodoWrite - Planning tasks: Use
mcp__cas__taskwith action: create and blocked_by for dependencies - Storing learnings: Use
mcp__cas__memorywith action: remember to store context - Searching context: Use
mcp__cas__searchwith action: search to find past work
Task Tools (USE INSTEAD OF TodoWrite)
Creating Tasks
Use mcp__cas__task with action: create and parameters:
title(required) - Task titlepriority- 0=critical, 1=high, 2=medium (default), 3=low, 4=backlogstart- Set to true to start immediately (RECOMMENDED)notes- Initial working notes
Managing Tasks
All task operations use mcp__cas__task with different actions:
- action: ready - Show tasks ready to work on
- action: blocked - Show blocked tasks
- action: list - List all tasks
- action: show - Show task details (requires id)
- action: update - Update notes as you work (requires id)
- action: close - Close with resolution (requires id)
Task Dependencies
- action: dep_add - Add blocking dependency (requires id, to_id)
- action: dep_list - List dependencies (requires id)
Memory Tools
All memory operations use mcp__cas__memory with different actions:
- action: remember - Store a memory entry (requires content)
- action: get - Get entry details (requires id)
- action: helpful - Mark as helpful (requires id)
- action: harmful - Mark as harmful (requires id)
Search Tools
Use mcp__cas__search with different actions:
- action: search - Search memories (requires query)
- action: context - Get full session context
Iteration Loops
Use loops for long-running repetitive tasks. The loop blocks session exit and re-injects your prompt until completion.
Use mcp__cas__coordination with different actions:
- action: loop_start - Start a loop (requires prompt, session_id, optional completion_promise and max_iterations)
- action: loop_status - Check current loop status (requires session_id)
- action: loop_cancel - Cancel active loop (requires session_id)
To complete a loop, output <promise>DONE</promise> (or your custom promise text).
Rules & Skills
Use mcp__cas__rule and mcp__cas__skill with different actions:
- rule action: list - Show active rules
- rule action: helpful - Promote rule to proven (requires id)
- skill action: list - Show enabled skills
© codingagentsystem, 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 .claude/skills/cas of codingagentsystem/cas.
Open the folder on GitHubat commit a0a4b5a
Compare with similar skills
Cas 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Cas this skillcodingagentsystem/cas | 176 | — | ~723 | Automated safety check: Pass | MIT | |
| MCP Server Builderanthropics/skills | 180k | 62 repos | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| MCP Server BuildershareAI-lab/learn-claude-code | 78k | 5 repos | ~1.2k | Automated safety check: Pass | MIT | |
| MCP Integration for Pluginsanthropics/claude-plugins-official | 37k | 11 repos | ~3.1k | Automated safety check: Pass | Apache-2.0 | |
| Fastmcp Client CLIPrefectHQ/fastmcp | 28k | 1 repos | ~823 | Automated safety check: Pass | Apache-2.0 | |
| MemPalace Memory SearchMemPalace/mempalace | 59k | — | ~1.4k | Automated safety check: Pass | MIT |
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Walks through building MCP servers in Python or TypeScript that expose tools, resources and prompts to Claude, with templates, registration and testing.
- Official
MCP Integration for Plugins
anthropics/claude-plugins-official
Explains how to bundle Model Context Protocol servers in a Claude Code plugin, covering config files, stdio, SSE, HTTP and WebSocket server types, and authentication.
Fastmcp Client CLI
PrefectHQ/fastmcp
Query and invoke tools on MCP servers using fastmcp list and fastmcp call.
MemPalace Memory Search
MemPalace/mempalace
Mines project files and conversation exports into a local, searchable memory palace and recalls past work by semantic search through the mempalace CLI.
Crush Configuration
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Explains how to configure the Crush coding agent with crushrc or crush.json, covering providers, models, LSPs, MCP servers, hooks, permissions and config precedence.
More from codingagentsystem/cas
Cas Search
codingagentsystem/cas
Search across CAS content (memories, tasks, rules, skills, code).
Cas Supervisor
codingagentsystem/cas
Factory supervisor guide for multi-agent EPIC orchestration.
Cas Worker
codingagentsystem/cas
Factory worker guide for task execution in CAS multi-agent sessions.
Cas Memory Management
codingagentsystem/cas
How to store and retrieve persistent memories using CAS. An agent skill from codingagentsystem/cas.
Cas Supervisor Checklist
codingagentsystem/cas
Quick startup checklist for factory supervisors. An agent skill from codingagentsystem/cas.
Cas Task Tracking
codingagentsystem/cas
How to track work using CAS tasks instead of built-in TodoWrite.
Related
Works with
Categories
Questions about Cas
What does Cas do?
Coding Agent System - unified memory, tasks, rules, and skills. Cas is an agent skill from codingagentsystem/cas. Coding Agent System - unified memory, tasks, rules, and skills.
When should I use Cas?
Cas fits situations like: you need to remember something; search past context.
How do I install Cas in Claude Code?
Run `npx skills add codingagentsystem/cas --skill cas -a claude-code`. Or copy the skill folder (.claude/skills/cas in codingagentsystem/cas) into .claude/skills/cas in your project. Claude Code loads it when a task matches its description.
How do I install Cas in Codex?
Run `npx skills add codingagentsystem/cas --skill cas -a codex`. Or copy the skill folder (.claude/skills/cas in codingagentsystem/cas) into .agents/skills/cas in your project. Codex loads it when a task matches its description.
Can I use Cas 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 codingagentsystem/cas --skill cas -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/cas, .gemini/skills/cas, .github/skills/cas and .opencode/skills/cas in your project.
What does Cas need to run?
SKILL.md names no scripts, command-line tools or credentials: Cas is instructions for the agent only.
Does Cas 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 Cas 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 Cas use?
Cas 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 Cas use?
About 723 tokens (SKILL.md is roughly 2.9k 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 Cas?
Skills that share tags, products or a category with Cas: MCP Server Builder (anthropics/skills, 180k stars), MCP Server Builder (shareAI-lab/learn-claude-code, 78k stars), MCP Integration for Plugins (anthropics/claude-plugins-official, 37k stars) and Fastmcp Client CLI (PrefectHQ/fastmcp, 28k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Cas?
codingagentsystem (a GitHub organization) maintains it in codingagentsystem/cas, which has 176 GitHub stars. The repository holds 7 skills in this directory. The repository was last updated on March 12, 2026.
Source: codingagentsystem/cas on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.