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Agent skill

Memstack Development API Designer

by cwinvestments in cwinvestments/memstack

A skill your agent uses when the user says 'design API', 'API endpoints', 'REST API', 'API designer', 'route structure', 'API architecture', or is designing RESTful API routes, request/response…

ProprietaryAuto-check passedBackend & APIs

Install Memstack Development API Designer

skills CLI
$ npx skills add cwinvestments/memstack --skill memstack-development-api-designer -a claude-code

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

GitHub CLI
$ gh skill install cwinvestments/memstack memstack-development-api-designer --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/development/api-designer .claude/skills/memstack-development-api-designer && 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
memstack-development-api-designer
GitHub stars
423
Token cost
~4.4k tokens
SKILL.md length
717 words
Files
1
Skills in repo
87
Repo updated
First seen
Licence
Proprietary

At a glance

A skill your agent uses when the user says 'design API', 'API endpoints', 'REST API', 'API designer', 'route structure', 'API architecture', or is designing RESTful API routes, request/response…

  • Works in 9 steps: Design Route Structure → Auth Guard Pattern → Input Validation with Zod → …
  • The user says design API
  • SKILL.md covers Activation, Protocol and Level History
  • Needs STRIPE_SECRET_KEY and STRIPE_WEBHOOK_SECRET

What it does

Memstack Development API Designer is an agent skill from cwinvestments/memstack. Use this skill when the user says 'design API', 'API endpoints', 'REST API', 'API designer', 'route structure', 'API architecture', or is designing RESTful API routes, request/response schemas, and endpoint organization. Do NOT use for API security audits or database design.

Its SKILL.md is about 4.4k 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 Backend & APIs, covering API design and REST APIs. It works with Zod. 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.

When your agent uses it

  • The user says design API
  • Route structure
  • API architecture
  • Is designing RESTful API routes

Example prompts

  • “design API”
  • “API endpoints”
  • “REST API”
  • “/memstack-development-api-designer”

Requirements

  • A credential in STRIPE_SECRET_KEY
  • A credential in STRIPE_WEBHOOK_SECRET

Workflow steps

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

  1. Design Route Structure
  2. Auth Guard Pattern
  3. Input Validation with Zod
  4. Consistent Response Format
  5. HTTP Status Codes
  6. Rate Limiting
  7. Webhook Endpoints
  8. Generate TypeScript Interfaces
  9. Complete Route Handler Template

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

    No scripts in the folder and no shell commands in SKILL.md (its code samples are typescript).

    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 these keys or tokens, usually read from environment variables:

    • STRIPE_SECRET_KEY
    • STRIPE_WEBHOOK_SECRET

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

Context cost

Memstack Development API Designer loads about 4.4k tokens when it runs. Until then it costs about 77 tokens; SKILL.md has 717 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~77
When it runs · the whole SKILL.md, loaded when a task matches
~4.4k

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 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

Its licence (Proprietary) doesn't allow us to republish the file, so here is its outline and opening line. It has 717 words (~4,361 tokens).

“Produces production-ready Next.js App Router API routes with auth guards, Zod validation, typed responses, and consistent error handling.”

— opening of SKILL.md by cwinvestments, Proprietary
name
memstack-development-api-designer
version
1.0.0
license
Proprietary, MemStack™ Pro by CW Affiliate Investments LLC. See LICENSE.txt

Read the full SKILL.md on GitHub

Files

Just SKILL.md in skills/development/api-designer of cwinvestments/memstack.

Open the folder on GitHubat commit 00370ce

Compare with similar skills

Memstack Development API Designer 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.

Memstack Development API Designer compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Memstack Development API Designer this skillcwinvestments/memstack423—~4.4kAutomated safety check: PassProprietary
Pangolin CRUD Endpointsfosrl/pangolin23k—~461Automated safety check: PassCustom licence
API DesignerJeffallan/claude-skills12k2 repos~2kAutomated safety check: PassMIT
Nodejs Backend Patternsever-works/ever-works15818 repos~4kAutomated safety check: PassAGPL-3.0
OpenAPI to MCP Servermcp-use/mcp-use11k—~5.2kAutomated safety check: PassApache-2.0
Old Coder API DesignAmazingAng/old-coder7491 repos~3.4kAutomated safety check: PassMIT

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Works with

Categories

Questions about Memstack Development API Designer

What does Memstack Development API Designer do?

A skill your agent uses when the user says 'design API', 'API endpoints', 'REST API', 'API designer', 'route structure', 'API architecture', or is designing RESTful API routes, request/response…. Memstack Development API Designer is an agent skill from cwinvestments/memstack. Use this skill when the user says 'design API', 'API endpoints', 'REST API', 'API designer', 'route structure', 'API architecture', or is designing RESTful API routes, request/response schemas, and endpoint organization.

When should I use Memstack Development API Designer?

Memstack Development API Designer fits situations like: the user says design API; route structure; API architecture; is designing RESTful API routes.

How do I install Memstack Development API Designer in Claude Code?

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

How do I install Memstack Development API Designer in Codex?

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

Can I use Memstack Development API Designer 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 memstack-development-api-designer -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/memstack-development-api-designer, .gemini/skills/memstack-development-api-designer, .github/skills/memstack-development-api-designer and .opencode/skills/memstack-development-api-designer in your project.

What does Memstack Development API Designer need to run?

Going by SKILL.md and its folder, Memstack Development API Designer needs credentials named STRIPE_SECRET_KEY and STRIPE_WEBHOOK_SECRET. Our summary lists: A credential in STRIPE_SECRET_KEY; A credential in STRIPE_WEBHOOK_SECRET.

Does Memstack Development API Designer 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 Memstack Development API Designer 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 Memstack Development API Designer use?

Memstack Development API Designer carries a proprietary licence (declared in SKILL.md). It is published on GitHub, but it is not open source: read the licence file before using or sharing it.

How many tokens does Memstack Development API Designer use?

About 4.4k tokens (SKILL.md is roughly 17k 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 Memstack Development API Designer?

Skills that share tags, products or a category with Memstack Development API Designer: Pangolin CRUD Endpoints (fosrl/pangolin, 23k stars), API Designer (Jeffallan/claude-skills, 12k stars), Nodejs Backend Patterns (ever-works/ever-works, 158 stars) and OpenAPI to MCP Server (mcp-use/mcp-use, 11k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Memstack Development API Designer?

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.