ensemble-feature

ensemble-feature is a skill for Claude Code, Codex from FortiumPartners/ensemble. It costs 46 tokens per session (1,669 once invoked), scanned A, original, MIT.

A single planning workflow that turns an idea into a Product Requirements Document, a technical design, and an implementation task plan.

In plain words
What is it for?
Use it to create and refine product and technical requirements, then generate an implementation plan; it does not execute the code changes.
Why use it?
It joins product planning and technical planning into one ordered process, while allowing review points before implementation begins.

Skill for Claude CodeCodex

Written for Claude Code and Codex: user-invocable in frontmatter, but also installed under .codex/. Also seen: model in frontmatter; names the AskUserQuestion tool; mentions Codex.

Part of the ensemble-codex plugin — 40 skills shipped together

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/fortiumpartners/ensemble/ensemble-feature
Any agent
npx skills add FortiumPartners/ensemble --skill ensemble-feature
Clone the repo
git clone --depth 1 https://github.com/FortiumPartners/ensemble

Made for: Claude Code, Codex.

Or install ensemble-codex, the plugin that ships this one along with the rest of its 40 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for ensemble-feature

README.md
[![agentmods](https://agentmods.dev/badge/skills/fortiumpartners/ensemble/ensemble-feature.svg)](https://agentmods.dev/skills/fortiumpartners/ensemble/ensemble-feature)
Your own site
<a href="https://agentmods.dev/skills/fortiumpartners/ensemble/ensemble-feature"><img src="https://agentmods.dev/badge/skills/fortiumpartners/ensemble/ensemble-feature.svg" alt="Measured on agentmods" height="20"></a>
Per session 46 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,669 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 5.1 $0.00046 $0.01669
Opus 5 $0.00023 $0.00834
Sonnet 5 $0.00009 $0.00334
Haiku 4.5 $0.00005 $0.00167

Measured 6d ago against content hash 6c063b6b1fe2, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

ensemble-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 6d ago.

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.

packages/codex/.codex/skills/commands/ensemble-feature/SKILL.md · 167 lines

How it starts

The opening of the file, as written. The whole thing — 167 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Ensemble Command: /ensemble:feature

This Codex skill mirrors the Ensemble slash command /ensemble:feature. Follow the workflow below, adapt to the current repository, and keep outputs structured.

Orchestrate the complete idea-to-plan pipeline as a single command. Runs five commands in strict sequence: (1) create-prd, (2) refine-prd, (3) create-trd, (4) refine-trd, (5) implement-trd-beads --plan. Each step completes before the next begins. Refinement steps (2 and 4) pause for user input via AskUserQuestion. The --skip-refine flag bypasses both refinement steps for an uninterrupted run. Planning only -- no code is executed. Terminates with a handoff message showing how to start implementation.

Workflow

Phase 1: Argument Parsing

1. Parse Arguments and Set Variables Parse $ARGUMENTS and initialize pipeline variables.

  1. If $ARGUMENTS is empty or blank, print the following and exit without running any pipeline step: Usage: /ensemble:feature [--skip-refine]

  2. Scan $ARGUMENTS for the --skip-refine token. If found, set SKIP_REFINE=true and remove the token from the remaining text. If not found, set SKIP_REFINE=false.

  3. Scan the remaining text for any other tokens that begin with --. If any unknown flag is found, print the following and exit without running any pipeline step: Error: Unknown flag ''. Only --skip-refine is supported. Usage: /ensemble:feature [--skip-refine]

  4. Set FEATURE_DESCRIPTION to the remaining argument text after removing --skip-refine if it was present. Preserve the description verbatim -- no transformation, truncation, or summarization.

Phase 2: Pipeline Execution

1. Step 1 - create-prd Print: [Step 1/5] create-prd...

Invoke /ensemble:create-prd with FEATURE_DESCRIPTION as the argument. Pass the description verbatim with no modification.

Read the full file on GitHub · 167 lines

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. 6d ago First seen · 167 lines · 46 tokens per session scan A 6c063b6b1fe2

Subscribe to this mod's changes

ensemble-feature is a skill published in the GitHub repository FortiumPartners/ensemble (11 stars, last pushed 1mo ago), licensed MIT. It adds 46 tokens to every session and 1,669 once invoked, about $0.0002 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 2026-08-30.

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