brainstorm-ideas-existing

An agent skill by phuryn, from phuryn/pm-skills. Tags: brainstorming, design, developer-tools, product-strategy, strategy.

What it does

Brainstorm product ideas for an existing product using multi-perspective ideation from PM, Designer, and Engineer viewpoints. Use when generating new feature ideas, brainstorming solutions for an identified opportunity, or ideating with a product trio.

Install

With the skills CLI, which installs into Claude Code, Codex, Cursor and other agents:

npx skills add phuryn/pm-skills --skill brainstorm-ideas-existing

Or copy the skill folder into Claude Code's skills directory by hand (~/.claude/skills for every project, or .claude/skills inside one):

git clone --depth 1 https://github.com/phuryn/pm-skills
cp -r pm-skills/pm-product-discovery/skills/brainstorm-ideas-existing ~/.claude/skills/brainstorm-ideas-existing

Safety box score

Grade A, minimal risk: 7 of 100 risk points, rated 2026-10-16. The grade rates what the skill and its scripts can reach on the machine of whoever installs it, across eight categories from shell execution to secrets access. How the score works.

This is a read-mostly brainstorming skill: it asks the agent to review user-provided research, optionally search the web for a product URL, and may save a markdown summary in the workspace. It does not ship scripts or ask for credentials, so the main risks are limited network access and writing a document to local files.

Category levels, from 0 (none) to 3 (high)
Category	Level	Why
Code & shell execution	0 (none)	No scripts, shell commands, or code evaluation are included in `SKILL.md`.
Network access	1 (low)	It says, "If they mention a product URL, use web search to understand the product," which sends queries to external search services.
Filesystem reach	1 (low)	It may read user-provided files and says, "If the output is substantial, save it as a markdown document in the user's workspace," but it does not describe broader file access.
Secrets & credentials	0 (none)	There is no request for tokens, passwords, `.env` files, keychains, or other credentials.
Privilege & persistence	0 (none)	The skill does not request sudo, global installs, services, shell changes, or OS-level configuration.
Instruction hijack surface	0 (none)	No prompt-injection style instructions appear; phrases like "Think step by step" are generic reasoning guidance, not an attempt to override rules.
Irreversible actions	0 (none)	It is an ideation-only workflow and does not instruct the agent to send messages, deploy, publish, pay, or delete anything.
Transparency	0 (none)	All content is plain markdown text; there are no binaries, hidden payloads, or unreviewable installers.

Before installing

Confirm that web search is acceptable for your use case, since product URLs may be sent to external search services.
Keep sensitive research or personas out of the workspace unless you want the agent to read them.
If you expect a long brainstorm, decide in advance whether you want a markdown file written back into the workspace.

Rated 2026-10-16 by an automated review of 1 file from the skill's repository.

Source

Repository: phuryn/pm-skills (all skills from this repository)
Path: pm-product-discovery/skills/brainstorm-ideas-existing/SKILL.md
Branch: main
Updated: 2026-09-19

brainstorm-ideas-new — Brainstorm feature ideas for a new product in initial discovery from PM, Designer, and Engineer perspectives.
product-vision — Brainstorm an inspiring, achievable, and emotional product vision that motivates teams and aligns stakeholders.
principle-redesign-from-first-principles — Apply when integrating a new requirement into an existing design.
ansoff-matrix — Generate an Ansoff Matrix analysis mapping growth strategies across market penetration, market development, product development, and diversification.
brainstorm-experiments-existing — Design experiments to test assumptions for an existing product — prototypes, A/B tests, spikes, and other low-effort validation methods.
brainstorm-experiments-new — Design lean startup experiments (pretotypes) for a new product.