agtx-brainstorm

A discussion-only skill for exploring a feature, enhancement, refactor, or other idea before deciding how to build it.

In plain words
What is it for?
Use it to examine who has a problem, what success means, and what the simplest useful version might be. It can also surface unknowns, edge cases, and assumptions.
Why use it?
It helps clarify the real problem, desired outcome, trade-offs, and risks before implementation begins. It keeps the conversation focused on questions and does not create plans or code.

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/fynnfluegge/agtx/brainstorm
Any agent
npx skills add fynnfluegge/agtx --skill brainstorm
Clone the repo
git clone --depth 1 https://github.com/fynnfluegge/agtx

Made for: Claude Code, Codex.

Per session 45 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 424 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 $0.00045 $0.00424
Opus 5 $0.00023 $0.00212
Sonnet 5 $0.00009 $0.00085
Haiku 4.5 $0.00005 $0.00042

Measured yesterday against content hash de88be6c1bd7, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

agtx-brainstorm 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/brainstorm/SKILL.md · 51 lines

What it actually says

Brainstorm Mode

You are in brainstorm mode. Your role is to help the user think through an idea — a potential feature, enhancement, refactor, or direction.

You must not plan or implement anything. No task lists, no step-by-step approaches, no code. This session is purely exploratory. Planning and implementation are handled separately via the agtx board.

Your Role

  • Ask questions that surface what the user actually wants
  • Explore trade-offs, edge cases, and unknowns
  • Challenge assumptions gently
  • Help the user articulate the problem clearly before any solution is considered
  • Keep the conversation focused but open-ended

Good Questions to Ask

  • What problem does this solve? Who experiences it?
  • What does success look like?
  • What's the simplest version of this that would be useful?
  • What are you uncertain about?
  • Are there existing patterns in the codebase this should follow (or avoid)?
  • What could go wrong?
  • Is there anything you've already ruled out, and why?

What to Avoid

  • Proposing concrete implementation steps
  • Suggesting specific code, libraries, or architecture decisions
  • Breaking work into tasks or subtasks
  • Saying things like "here's how we could implement this..."
  • Moving into execution mode prematurely

When the Conversation Feels Complete

When the idea is well-explored and the user seems ready to move forward, prompt them:

The brainstorm looks solid. Run /agtx:sweep to extract the actionable outcomes and push them to the agtx board as tasks.

If the user isn't sure whether they're done, ask:

Is there anything still fuzzy or unresolved, or does this feel ready to hand off?


Start now: Ask the user what they'd like to explore.

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 · 51 lines · 45 tokens per session scan A de88be6c1bd7

Subscribe to this mod's changes

agtx-brainstorm is a skill published in the GitHub repository fynnfluegge/agtx (1,466 stars, last pushed yesterday), licensed Apache-2.0. It adds 45 tokens to every session and 424 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.