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/tanstack/devtools/devtools-marketplacenpx skills add TanStack/devtools --skill devtools-marketplacegit clone --depth 1 https://github.com/TanStack/devtoolsWhat 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 | $0.00054 | $0.03513 |
| Opus 5 | $0.00027 | $0.01757 |
| Sonnet 5 | $0.00011 | $0.00703 |
| Haiku 4.5 | $0.00005 | $0.00351 |
Grade A, and why
devtools-marketplace 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 2d 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 — 391 lines — stays where its author put it; the contents beside it link to each section on GitHub.
TanStack Devtools Marketplace
Prerequisite: Build a working plugin first using the devtools-plugin-panel skill. The marketplace submission assumes you already have a published npm package that exports either a JSX panel component or a function-based plugin.
Overview
The TanStack Devtools Marketplace is a built-in registry inside the devtools shell. Users browse it from the Marketplace tab, and can install plugins with a single click. Submission is a PR to the packages/devtools/src/tabs/plugin-registry.ts file in the TanStack/devtools repository.
PluginMetadata Interface
Every marketplace entry conforms to the PluginMetadata interface exported from packages/devtools/src/tabs/plugin-registry.ts:
export interface PluginMetadata {
/** Package name on npm (e.g., '@acme/react-analytics-devtools') */
packageName: string
/** Display title shown on the marketplace card */
title: string
/** Short description of what the plugin does */
description?: string
/** URL to a logo image (SVG, PNG, etc.) */
logoUrl?: string
/** Required base package dependency */
requires?: {
/** Required package name (e.g., '@tanstack/react-query') */
packageName: string
/** Minimum required version (semver) */
minVersion: string
/** Maximum version (if there's a known breaking change) */
maxVersion?: string
}
/** Plugin import configuration -- enables one-click auto-install */
pluginImport?: {
/** The exact export name to import from the package
* (e.g., 'FormDevtoolsPlugin' or 'ReactQueryDevtoolsPanel') */
importName: string
/** 'jsx' = component rendered via { name, render: <Component /> }
* 'function' = called directly as FnName() in the plugins array */
type: 'jsx' | 'function'
}
/** Custom plugin ID for matching against registered plugins.
* The default behavior lowercases the package name and replaces
* non-alphanumeric characters with '-'.
* Example: pluginId: 'tanstack-form' matches 'tanstack-form-4'. */
pluginId?: string
/** URL to the plugin's documentation */
docsUrl?: string
/** Plugin author/maintainer */
author?: string
/** Repository URL */
repoUrl?: string
/** Framework this plugin supports */
framework: 'react' | 'solid' | 'vue' | 'svelte' | 'angular' | 'other'
/** Mark as featured -- appears in the Featured section with animated border.
* Reserved for official TanStack partners. */
featured?: boolean
/** Mark as new -- shows a "New" banner on the card */
isNew?: boolean
/** Tags for filtering and categorization */
tags?: Array<string>
}
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.
- 2d ago First seen · 391 lines · 54 tokens per session scan A 8a8b5f1d4e26
devtools-marketplace is a skill published in the GitHub repository TanStack/devtools (493 stars, last pushed 2d ago), licensed MIT. It adds 54 tokens to every session and 3,513 once invoked, about $0.0003 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.
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