marimo-check

marimo-check is a command for Claude Code from koaning/wigglystuff. It costs 5 tokens per session (119 once invoked), scanned A, original, MIT.

A command result from running marimo's notebook checker with automatic fixes enabled. It reports warnings and errors for a specified marimo notebook.

In plain words
What is it for?
Use it to decide whether to open a notebook and fix the warnings or errors reported by marimo.
Why use it?
It shows whether the notebook has checker-reported problems without requiring manual inspection first.

Command for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Good fit Use it to decide whether to open a notebook and fix the warnings or errors reported by marimo.

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Install with agentmods
npx agentmods add commands/koaning/wigglystuff/marimo-check
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.

Clone the repo
git clone --depth 1 https://github.com/koaning/wigglystuff

Made for: Claude Code.

Wrote 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.

agentmods badge for marimo-check

README.md
[![agentmods](https://agentmods.dev/badge/commands/koaning/wigglystuff/marimo-check/github.svg)](https://agentmods.dev/commands/koaning/wigglystuff/marimo-check)
Your own site
<a href="https://agentmods.dev/commands/koaning/wigglystuff/marimo-check"><img src="https://agentmods.dev/badge/commands/koaning/wigglystuff/marimo-check/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for marimo-check

Your own site · 80×15
<a href="https://agentmods.dev/commands/koaning/wigglystuff/marimo-check"><img src="https://agentmods.dev/badge/commands/koaning/wigglystuff/marimo-check.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 5 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 119 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00005 $0.00119
Opus 5.5 $0.00002 $0.00048
Sonnet 5.5 $0.00001 $0.00024
Haiku 4.5 $0.00001 $0.00012

Measured yesterday against content hash 757d4ad5d85b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

marimo-check 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.

.claude/commands/marimo-check.md · 16 lines

What it actually says

Context

This is the output of the "uvx marimo check --fix $ARGUMENTS" command:

!uvx marimo check --fix $ARGUMENTS || true

Your task

Only (!) if the context suggests we need to edit the notebook, read the file $ARGUMENTS, then fix any warnings or errors shown in the output above. Do not make edits or read the file if there are no issues.

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 · 16 lines · 5 tokens per session scan A 757d4ad5d85b

Subscribe to this mod's changes

marimo-check is a command published in the GitHub repository koaning/wigglystuff (450 stars, last pushed yesterday), licensed MIT. It adds 5 tokens to every session and 119 once invoked, about $0.0000 per session on Opus 5.5. 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 2026-10-14.

Related

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