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Agent skill

Memstack Product Feature Spec

by cwinvestments in cwinvestments/memstack

A skill your agent uses when the user says 'feature spec', 'spec this feature', 'write a spec', 'functional requirements', or needs a detailed specification for one feature with user flows, edge…

ProprietaryAuto-check passedProduct & Project Management

Install Memstack Product Feature Spec

skills CLI
$ npx skills add cwinvestments/memstack --skill memstack-product-feature-spec -a claude-code

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

GitHub CLI
$ gh skill install cwinvestments/memstack memstack-product-feature-spec --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/product/feature-spec .claude/skills/memstack-product-feature-spec && 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-product-feature-spec
GitHub stars
423
Token cost
~2.4k tokens
SKILL.md length
669 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 'feature spec', 'spec this feature', 'write a spec', 'functional requirements', or needs a detailed specification for one feature with user flows, edge…

  • Works in 6 steps: Gather Feature Context → Write Feature Brief → Define User Flows → …
  • The user says feature spec
  • SKILL.md covers Activation, Context Guard, Common Mistakes and Protocol, plus 3 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Memstack Product Feature Spec is an agent skill from cwinvestments/memstack. Use this skill when the user says 'feature spec', 'spec this feature', 'write a spec', 'functional requirements', or needs a detailed specification for one feature with user flows, edge cases, API definitions, and acceptance criteria. Do NOT use for full PRDs or user story generation.

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 Product & Project Management, covering PRD writing, User stories and UX design. 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 feature spec
  • Spec this feature
  • Functional requirements
  • Needs a detailed specification for one feature with user flows

Example prompts

  • “feature spec”
  • “spec this feature”
  • “write a spec”
  • “/memstack-product-feature-spec”

Workflow steps

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

  1. Gather Feature Context
  2. Write Feature Brief
  3. Define User Flows
  4. Document Edge Cases & Error States
  5. Define API Contract (if applicable)
  6. Estimate Effort & Dependencies

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 markdown and json).

    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

Memstack Product Feature Spec loads about 2.4k tokens when it runs. Until then it costs about 79 tokens; SKILL.md has 669 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~79
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 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 669 words (~2,369 tokens).

“Creates a detailed specification for a single feature including user story, acceptance criteria, user flows, edge cases, API definitions, dependencies, and effort estimate.”

— opening of SKILL.md by cwinvestments, Proprietary
name
memstack-product-feature-spec
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/product/feature-spec of cwinvestments/memstack.

Open the folder on GitHubat commit 00370ce

Compare with similar skills

Memstack Product Feature Spec 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 Product Feature Spec compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Memstack Product Feature Spec this skillcwinvestments/memstack423—~2.4kAutomated safety check: PassProprietary
Product Skillsalirezarezvani/claude-skills28k—~2.6kAutomated safety check: PassMIT
Ralph Tui Create Beadssubsy/ralph-tui2.5k1 repos~2.6kAutomated safety check: PassMIT
Ralph Tui Create Beads Rustsubsy/ralph-tui2.5k1 repos~2.8kAutomated safety check: PassMIT
Ralph Tui Create JSONsubsy/ralph-tui2.5k1 repos~2.6kAutomated safety check: PassMIT
To Prdywwynm/EverythingDone14411 repos~777Automated safety check: PassGPL-3.0

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Categories

Questions about Memstack Product Feature Spec

What does Memstack Product Feature Spec do?

A skill your agent uses when the user says 'feature spec', 'spec this feature', 'write a spec', 'functional requirements', or needs a detailed specification for one feature with user flows, edge…. Memstack Product Feature Spec is an agent skill from cwinvestments/memstack. Use this skill when the user says 'feature spec', 'spec this feature', 'write a spec', 'functional requirements', or needs a detailed specification for one feature with user flows, edge cases, API definitions, and acceptance criteria.

When should I use Memstack Product Feature Spec?

Memstack Product Feature Spec fits situations like: the user says feature spec; spec this feature; functional requirements; needs a detailed specification for one feature with user flows.

How do I install Memstack Product Feature Spec in Claude Code?

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

How do I install Memstack Product Feature Spec in Codex?

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

Can I use Memstack Product Feature Spec 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-product-feature-spec -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-product-feature-spec, .gemini/skills/memstack-product-feature-spec, .github/skills/memstack-product-feature-spec and .opencode/skills/memstack-product-feature-spec in your project.

What does Memstack Product Feature Spec need to run?

SKILL.md names no scripts, command-line tools or credentials: Memstack Product Feature Spec is instructions for the agent only.

Does Memstack Product Feature Spec 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 Product Feature Spec 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 Product Feature Spec use?

Memstack Product Feature Spec 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 Product Feature Spec use?

About 2.4k tokens (SKILL.md is roughly 9.5k 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 Product Feature Spec?

Skills that share tags, products or a category with Memstack Product Feature Spec: Product Skills (alirezarezvani/claude-skills, 28k stars), Ralph Tui Create Beads (subsy/ralph-tui, 2.5k stars), Ralph Tui Create Beads Rust (subsy/ralph-tui, 2.5k stars) and Ralph Tui Create JSON (subsy/ralph-tui, 2.5k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Memstack Product Feature Spec?

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.