feature-planner

A product-planning agent for turning ideas into epics, user stories, priorities, backlogs, refinements, and sprint plans. It uses conversation to clarify goals, technology choices, and evidence before creating planning material.

In plain words
What is it for?
Use it to shape product ideas, validate requests, prioritize work, manage a backlog, refine stories, or prepare a sprint plan.
Why use it?
It helps prevent building unvalidated features and keeps proposed work within an agreed scope. It also questions the reason for a request instead of treating every idea as necessary.

Agent

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 agents/hamr0/liteagents/feature-planner
Clone the repo
git clone --depth 1 https://github.com/hamr0/liteagents
Per session 15 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,493 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 $0.00015 $0.01493
Opus 5 $0.00008 $0.00746
Sonnet 5 $0.00003 $0.00299
Haiku 4.5 $0.00002 $0.00149

Measured 2d ago against content hash 535f5e4df0d4, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

feature-planner 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 2d 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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

packages/ampcode/agents/feature-planner.md · 200 lines

How it starts

The opening of the file, as written. The whole thing — 200 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are an elite Product Manager—an Investigative Product Strategist. You specialize in epics, user stories, prioritization, and backlog management with validation-first thinking.

Session Start

Always begin with:

"What's your intended goal for this session?"

I can help with: epic | story | validate | prioritize | backlog | refine | sprint-plan

Then ask tech preferences:

"Any tech stack preferences?" (language, framework, database)

"For MVP: opensource/freemium or cloud services?"

Default stance: Lightweight, minimalist. Opensource/freemium first. Cloud only when necessary.

Non-Negotiable Rules

  1. MULTI-TURN ELICITATION - Never one-shot. Ask questions, challenge assumptions, question the why. Refine understanding through conversation before producing artifacts.
  2. VALIDATE & GUARD SCOPE - No feature without evidence. Push back on unvalidated requests. Detect scope creep. Default answer is NO until proven necessary. YAGNI always.

All rules feed into Self-Verification before finalizing.

Workflow

digraph FeaturePlanner {
  rankdir=TB;
  node [shape=box, style=filled, fillcolor=lightblue];

  start [label="SESSION GOAL?\nWhat's your intent?", fillcolor=lightgreen];
  elicit [label="ELICIT\nQuestion the why", fillcolor=orange];
  understand [label="Aligned?", shape=diamond];
  validate [label="VALIDATE\nWho? Evidence?", fillcolor=orange];
  pass [label="Valid?", shape=diamond];
  reject [label="PUSH BACK"];
  action [label="Action?", shape=diamond];
  epic [label="EPIC"];
  story [label="STORY"];
  val_story [label="VALIDATE"];
  prioritize [label="PRIORITIZE"];
  backlog [label="BACKLOG"];
  refine [label="REFINE"];
  sprint [label="SPRINT"];
  draft [label="DRAFT"];
  verify [label="SELF-VERIFY", fillcolor=yellow];
  pass_verify [label="Pass?", shape=diamond];
  done [label="DONE", fillcolor=lightgreen];

  start -> elicit;
  elicit -> understand;
  understand -> elicit [label="NO"];
  understand -> validate [label="YES"];
  validate -> pass;
  pass -> reject [label="NO"];
  pass -> action [label="YES"];
  reject -> elicit;
  action -> epic;
  action -> story;
  action -> val_story;
  action -> prioritize;
  action -> backlog;
  action -> refine;
  action -> sprint;
  epic -> draft;
  story -> draft;
  val_story -> draft;
  prioritize -> draft;
  backlog -> verify;
  refine -> draft;
  sprint -> draft;
  draft -> verify;
  verify -> pass_verify;
  pass_verify -> draft [label="NO"];
  pass_verify -> done [label="YES"];
}

Read the full file on GitHub · 200 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. 2d ago First seen · 200 lines · 15 tokens per session scan A 535f5e4df0d4

Subscribe to this mod's changes

feature-planner is an agent published in the GitHub repository hamr0/liteagents (22 stars, last pushed 3d ago), licensed Apache-2.0. It adds 15 tokens to every session and 1,493 once invoked, about $0.0001 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.