feature

A feature-management tool for creating, viewing, tracking, completing, and archiving feature specifications and implementation plans.

In plain words
What is it for?
Use it to create a feature brief and plan, list or inspect features, mark completed work, and archive finished plans.
Why use it?
It keeps the planned work, its requirements, and its progress in one repeatable structure instead of scattered notes.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/gh33k/session-plugin/feature
Any agent
npx skills add gh33k/session-plugin --skill feature
Clone the repo
git clone --depth 1 https://github.com/gh33k/session-plugin

Made for: Claude Code, Codex.

Per session 6 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,498 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00006 $0.02498
Opus 5 $0.00003 $0.01249
Sonnet 5 $0.00001 $0.00500
Haiku 4.5 $0.00001 $0.00250

Measured yesterday against content hash 744d4d29ffdb, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

feature scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/feature/SKILL.md · 404 lines

How it starts

The opening of the file, as written. The whole thing — 404 lines — stays where its author put it; the contents beside it link to each section on GitHub.

session:feature

Manage feature spec/plan lifecycle. Create new features during plan sessions, track progress during build sessions, and mark complete when finished.

Usage

/session:feature create <name>    - Create a new feature with spec and plan
/session:feature list             - List all features and their status
/session:feature show <name>      - Show feature details
/session:feature complete <name>  - Mark feature as complete
/session:feature archive <name>   - Archive a completed feature's plan

Instructions

/session:feature create

Creates a new feature directory with spec.md and plan.md from templates.

Best used during: PLAN sessions

Steps:
  1. Validate feature name:

    • Must be lowercase, hyphenated (e.g., user-auth, payment-flow)
    • Cannot already exist
    ls -d .project/features/{{name}} 2>/dev/null && echo "EXISTS"
    
  2. Create feature directory:

    mkdir -p .project/features/{{name}}
    
  3. Gather feature information - Ask the user:

    • "What is this feature about?" (for Overview)
    • "What are the main goals?" (for Goals section)
    • "What should this feature NOT do?" (for Non-Goals)
    • "What are the key requirements?" (for Requirements)
    • "How will we know it's done?" (for Acceptance Criteria)
  4. Create spec.md: Use the template from plugins/session-workflow/templates/feature-spec.md.template

    Fill in:

    • {{FEATURE_NAME}}: The feature name (title-cased)
    • {{STATUS}}: draft
    • {{CREATED_DATE}}: Today's date
    • {{UPDATED_DATE}}: Today's date
    • {{FEATURE_OVERVIEW}}: User's description
    • Goals, Non-Goals, Requirements, Acceptance Criteria from user input
    • Leave technical details as placeholders or ask if user wants to fill them
  5. Create plan.md: Use the template from plugins/session-workflow/templates/feature-plan.md.template

    Ask the user:

    • "What's the implementation goal?"
    • "What's the current state before this feature?"
    • "What high-level changes are needed?"
    • "How should we break this into phases?"

Read the full file on GitHub · 404 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 404 lines · 6 tokens per session scan A 744d4d29ffdb

Subscribe to this mod's changes

feature is a skill published in the GitHub repository gh33k/session-plugin (2 stars, last pushed 7mo ago), licensed MIT. It adds 6 tokens to every session and 2,498 once invoked, about $0.0000 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.