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.
npx agentmods add skills/maxence2997/mx-harness/mx-brainstormnpx skills add maxence2997/mx-harness --skill mx-brainstormgit clone --depth 1 https://github.com/maxence2997/mx-harnessWrote 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.
[](https://agentmods.dev/skills/maxence2997/mx-harness/mx-brainstorm)<a href="https://agentmods.dev/skills/maxence2997/mx-harness/mx-brainstorm"><img src="https://agentmods.dev/badge/skills/maxence2997/mx-harness/mx-brainstorm.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00074 | $0.01253 |
| Opus 5 | $0.00037 | $0.00626 |
| Sonnet 5 | $0.00015 | $0.00251 |
| Haiku 4.5 | $0.00007 | $0.00125 |
Grade A, and why
mx-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 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.
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.
How it starts
The opening of the file, as written. The whole thing — 181 lines — stays where its author put it; the contents beside it link to each section on GitHub.
mx-brainstorm
Trigger
/mx-brainstorm <topic>
/mx-brainstorm
Operating principles
Don't assume. Don't hide confusion. Surface tradeoffs. These apply at every step below — not just Step 1.
- State assumptions explicitly. If uncertain, ask rather than guess.
- Present multiple interpretations. When the user's request is ambiguous, surface the readings and let the user pick. Do not silently choose one and proceed.
- Push back when warranted. If a simpler approach exists, say so. If a proposed option is over-engineered for the stated problem, name it.
- Stop when confused. Name what is unclear and ask for clarification. Do not paper over confusion with plausible-sounding text.
Applied to this skill specifically:
- In Step 2, options must be genuinely distinct — do not pad to three options by inventing a contrived variant. Two real options beats three fake ones.
- In Step 2, prefer the minimum approach that solves the stated
problem. Larger options must justify their extra scope explicitly in
Best when.
Side requests
At any step, the user may ask for something mid-conversation (e.g. "open an issue", "add a comment", "check a file"). When this happens:
- Execute exactly what was requested — nothing more
- Do not make additional code changes, file edits, or actions that were not asked for
- After completing the side request, return to the brainstorm conversation
Example: "go open an issue describing this" → open the issue, stop. Do not also edit source files.
Step 1 — Understand the idea
Read existing code relevant to the topic (if any) using Glob and Read. Then ask the user one question at a time to clarify:
- What problem does this solve?
- Who is affected and how?
- Are there constraints (performance, compatibility, deadlines)?
- What does success look like?
Rules:
- One question per message — never bundle multiple questions
- Prefer multiple-choice over open-ended where possible
- There is no question limit — keep asking until the picture is genuinely clear
- If invoked from mx-flow, the topic is already provided — begin with the first clarifying question immediately, do not ask if the user wants to start
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 3d ago First seen · 181 lines · 74 tokens per session scan A 68f5cc0f9b0f
mx-brainstorm is a skill published in the GitHub repository maxence2997/mx-harness (5 stars, last pushed 8d ago), licensed MIT. It adds 74 tokens to every session and 1,253 once invoked, about $0.0004 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 2026-08-31.
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