Day in Our Data · Saturday, October 3, 2026, 11 a.m. to 3 p.m.
Claude Code gets much more useful when you plug things into it. Here is what each kind of add-on does, and the ones worth installing today.
| Add-on | What it is | Example | How you add it |
|---|---|---|---|
| Connector (MCP server) | A bridge to an outside service, so Claude can read from it or act in it. | Let Claude open issues on GitHub, or drive a real browser to test your page. | claude mcp add … in your terminal, or Settings → Connectors on claude.ai. |
| Skill | A folder of instructions and scripts Claude loads only when a task needs it. | Build an Excel file with working formulas; make a PDF report. | Usually bundled in a plugin. Your own go in .claude/skills/. |
| Plugin | A bundle of skills, commands, agents, hooks, and connectors you install in one go. | Compound Engineering: a whole plan → build → review workflow. | /plugin inside a session, or claude plugin install …. |
Workflow · Every
Turns vibe coding into a repeatable loop: brainstorm, plan, build, review, then write down what you learned so the next loop is faster. The workflow page is built around it.
/plugin marketplace add EveryInc/compound-engineering-plugin
/plugin install compound-engineeringOfficial · Anthropic
One-word commands to commit, push, and open a pull request, so saving your work is never the hard part.
/plugin install commit-commands@claude-plugins-officialOfficial · Anthropic
Helps Claude make web pages and dashboards that look designed, not default. Good for any project with a public page.
/plugin install frontend-design@claude-plugins-officialOfficial · Anthropic
A guided feature workflow: explore the code, ask clarifying questions, design, build, review.
/plugin install feature-dev@claude-plugins-officialOfficial · Anthropic
Specialist reviewers that read your changes for bugs, missing tests, and unclear code before a teammate does.
/plugin install code-review@claude-plugins-official
/plugin install pr-review-toolkit@claude-plugins-officialOfficial · Anthropic
Warns about risky patterns (leaked secrets, unsafe input handling) as Claude edits. Cheap insurance for anything public.
/plugin install security-guidance@claude-plugins-officialOfficial · Anthropic
Gives Claude real code intelligence (go-to-definition, type errors) for Python or JavaScript/TypeScript, so it catches mistakes before running anything.
/plugin install pyright-lsp@claude-plugins-official
/plugin install typescript-lsp@claude-plugins-officialOfficial · Anthropic
Helps you write your own skill: for example, how our team cleans Village CSVs, so every teammate's Claude does it the same way.
/plugin install skill-creator@claude-plugins-officialAnthropic skills
Let Claude read and produce real spreadsheets, PDFs, Word files, and slide decks. Perfect for turning a cleaned dataset into a one-page handout for a commission.
/plugin marketplace add anthropics/skills
/plugin install document-skills@anthropic-agent-skillsAnthropic skills
Design, testing, and communication skills, including one for testing web apps in a real browser. Read them to learn how skills are written.
/plugin install example-skills@anthropic-agent-skillsWrite your own
Create .claude/skills/clean-village-csv/SKILL.md with a short description and the steps your team agreed on. Claude loads it whenever a task matches the description.
---
name: clean-village-csv
description: Clean a Village of Oak Park CSV before analysis
---
1. Trim whitespace in every column; standardise dates to YYYY-MM-DD.
2. Report rows dropped and why.
3. Save to data/clean/ and cite the source file in the README.Add connectors from your terminal with claude mcp add, then check them with /mcp inside a session. If you use claude.ai or the desktop app, connect services under Settings → Connectors instead.
| Connector | Why today | How to add |
|---|---|---|
| GitHub | Create your repo, open issues for your team's to-do list, and review pull requests without leaving Claude. | claude mcp add --transport http github https://api.githubcopilot.com/mcp/ (sign in when prompted), or the GitHub connector on claude.ai. |
| Playwright | Claude opens your page in a real browser, clicks around, and takes screenshots: automated QA. | claude mcp add playwright npx @playwright/mcp@latest (needs Node.js). |
| Google Drive | Pull in a shared team doc or spreadsheet as context. | claude.ai Settings → Connectors. |
| Notion or Slack | Read your team's notes or channel; post a status update at demo time. | claude.ai Settings → Connectors. |
| Figma | Turn a sketch or mockup into a working page, or send a page back to Figma. | claude.ai Settings → Connectors, or Figma's own MCP server. |
| Supabase | A free hosted database if your prototype needs to save data. | claude.ai Settings → Connectors. |
| Mermaid Chart | Draw flowcharts and architecture diagrams from a description. | claude.ai Settings → Connectors. |
You do not need to learn these. Knowing the names helps you ask for them.
| Library | Good for | Try asking |
|---|---|---|
| pandas | Loading and cleaning CSVs; totals, averages, grouping. | Load the business licenses and count openings per year by corridor. |
| geopandas | Maps: joining points to boundaries, distances. | Which schools have a crash within 300 feet of a safe route? |
| folium | Interactive web maps you can open in a browser. | Make a folium map of trees coloured by genus. |
| plotly / matplotlib | Charts: interactive or static. | Chart the tax levy over 20 years in today's dollars. |
| streamlit | A shareable data app in one Python file. | Turn this into a streamlit app with a dropdown for the school. |
| pytest | Automated checks that your code and numbers are right. | Write tests for the cleaning function. See testing. |