last30days
mvanhorn/last30days-skillResearch skill that searches Reddit, X, YouTube, Hacker News, Polymarket and more for the last 30 days, scores results by engagement, and writes a cited brief.
Recommended
Broad access Depth 5/5
A Claude data analysis skill is rarely one thing. In our catalog the data category mixes three kinds of work: query and schema rules for databases, collecting data from the web, and turning numbers into reports or charts. We reviewed 18 skills: 8 get an install verdict and 10 come with caveats.
Few of these are notebook style analysis skills that load a CSV and plot it. If that is your job, check whether you need a skill at all. The ones here help most where you need fixed rules, integrations or a set output format.
What to look for in a Claude data analysis skill
Start with the source of truth. A database rulebook such as Supabase’s is useful because it encodes constraints the agent would otherwise guess: query shape, connections, locking, row level security. A scraping or research skill is only as safe as the services it calls.
Check where credentials go. Data skills often take database URLs, API tokens or paid-service keys. Look for skills that send a key only to the service it belongs to. Check what leaves your machine: scraped pages and exports can contain customer data, and the Claude Code docs warn you to verify that you trust each connected server.
Then check whether the skill can write. Reading a database is one risk, running migrations another. Keep production access read-only. Of the 18 skills, 2 are clean, 10 are marked “review” and 6 have broad access. The security page explains the labels.
Recommended data skills
- supabase-postgres-best-practices is clean. A 3 KB entry file points to 34 rule files on queries, connections, schema, locking, RLS and monitoring. It works for any Postgres, not only Supabase, and it has about 465,000 recorded installs.
- PM Skills Marketplace is clean: 69 product management skills and 42 command workflows in nine plugins, covering discovery, strategy, analytics and launch. It is mostly Markdown with no integrations. One note: the README includes an optional Windows workaround that creates a SYSTEM level scheduled task, so read it before copying commands.
- AntV Infographic skills turn your text into a self-contained infographic. The creator skill is useful alone; the other four matter only if you contribute to the library. The generated HTML pulls the AntV library from unpkg at the latest version, so pin it if you ship the output.
- Claude Ads reads exported ad platform data and writes versioned JSON reports. It is read-only by default and approval gated for changes. It needs Python 3.11 or 3.12.
- ToolUniverse gives an agent access to thousands of scientific databases through a Python SDK and MCP server. It is deep and we label it broad access, so see the science category for its notes.
On the cautious side, the Microsoft azure-kusto skill is a single file of KQL patterns for Azure Data Explorer and is only worth installing if you run Kusto. Nexscope’s Amazon Skills are mostly prompts without data behind them.
For web data collection, see browser skills. For market and search analysis, see SEO and marketing. The category page lists all 18, and how we review covers scoring.