pm-brainstorm

An informal product-idea discussion with Nano, an expert product manager who uses your company context and current goals.

In plain words
What is it for?
Use it to discuss product ideas, user needs, feature choices, and priorities in named, resumable sessions.
Why use it?
It gives you a thinking partner for exploring user problems and deciding what to build next without requiring a formal product requirements document.

Skill for Claude CodeCodex

Part of the nanopm plugin — 26 skills, 1 hook 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/nmrtn/nanopm/pm-brainstorm
Any agent
npx skills add nmrtn/nanopm --skill pm-brainstorm
Clone the repo
git clone --depth 1 https://github.com/nmrtn/nanopm

Made for: Claude Code, Codex.

Or install nanopm, the plugin that ships this one along with the rest of its 26 skills, 1 hook.

Per session 64 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,942 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 2 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 $0.00064 $0.01942
Opus 5 $0.00032 $0.00971
Sonnet 5 $0.00013 $0.00388
Haiku 4.5 $0.00006 $0.00194

Measured 3d ago against content hash d1a7bfb13189, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade C, and why

pm-brainstorm scanned grade C with 2 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 3d 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.

Downloads and executes remote codehighSupply chain

curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.

{ echo "ERROR: nanopm not installed. Run: curl -fsSL https://raw.githubusercontent.com/nmrtn/nanopm/main/setup | bash"; exit 1; }

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

{ echo "ERROR: nanopm not installed. Run: curl -fsSL https://raw.githubusercontent.com/nmrtn/nanopm/main/setup | bash"; exit 1; }
pm-brainstorm/SKILL.md · 141 lines

How it starts

The opening of the file, as written. The whole thing — 141 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Multi-host portability rules. When invoking AskUserQuestion:

  1. The header field MUST be a short noun phrase (≤ 12 characters). Mistral Vibe rejects longer headers with string_too_long. Pick from: Start, Target, Scope, Audience, Methodology, Feature, Question.
  2. The options list MUST have at least 2 items. Vibe rejects empty/single-option calls. For free-text input, always provide ≥ 2 framing options (e.g. Yes, here's the input / Skip) — never call ask_user_question with options: [].

Preamble (run first)

source ~/.nanopm/lib/nanopm.sh 2>/dev/null || \
  source .nanopm/lib/nanopm.sh 2>/dev/null || \
  { echo "ERROR: nanopm not installed. Run: curl -fsSL https://raw.githubusercontent.com/nmrtn/nanopm/main/setup | bash"; exit 1; }
nanopm_preamble
echo "OBJECTIVES: $( [ -f .nanopm/wiki/docs/objectives.md ] && echo present || echo absent )"

What this is

/pm-brainstorm is an informal jam with Nano, the expert CPO on your product team — a skeptical-but-supportive partner, in service of you (the PM/founder), who already knows your company, product, and current objectives. It is NOT a gated pipeline step: no falsifiable bet is forced, no PRD is produced, nothing is blocked. It's the "let's just think about this out loud" surface — for a vague feature idea, a user problem, a "is this even worth building" gut check.

The value over a blank ChatGPT thread: full context is already loaded (CONTEXT-SUMMARY.md

  • OBJECTIVES.md from the preamble), and the conversation is resumable later via your host's native session resume — so the thinking compounds instead of evaporating.

This skill primes the persona and context, then you just keep talking. The multi-turn conversation that follows IS the jam.

Phase 1: New jam or resume a past one

Read the user's past brainstorms (most recent first):

source ~/.nanopm/lib/nanopm.sh 2>/dev/null || source .nanopm/lib/nanopm.sh 2>/dev/null || true
nanopm_brainstorm_list --limit 8

Read the full file on GitHub · 141 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. 3d ago First seen · 141 lines · 64 tokens per session scan C d1a7bfb13189

Subscribe to this mod's changes

pm-brainstorm is a skill published in the GitHub repository nmrtn/nanopm (48 stars, last pushed 1mo ago), licensed MIT. It adds 64 tokens to every session and 1,942 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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