Boycott Filter

Personal boycott list managed conversationally through Claude Code, synced to a Chrome extension that warns you when you visit boycotted brands.

When to use

• User says "never buying from X again", "I hate X", "boycott X", "block X"
• User complains about a brand, company, or product they want to avoid
• User asks to see, add, remove, or update their boycott list
• User asks about the Chrome extension or boycott filter status

How it works

1. User tells you about a brand they want to avoid (casually or explicitly)
2. You extract: company name, reason (from their complaint), and aliases (known sub-brands)
3. You add it to the boycott list via the local sync server
4. Chrome extension picks it up within 30 seconds and warns on matching pages

Server

The boycott filter runs a local HTTP server on port 7847.

Start the server

node ~/.claude/plugins/cache/boycott-filter-marketplace/boycott-filter/1.0.0/scripts/server.js &

API

Base URL: http://127.0.0.1:7847

Add a company

curl -s -X POST http://127.0.0.1:7847/add \
  -H 'Content-Type: application/json' \
  -d '{"name":"Temu","reason":"Cheap garbage, ads everywhere","aliases":["temu.com"]}'

Remove a company

curl -s -X DELETE http://127.0.0.1:7847/remove \
  -H 'Content-Type: application/json' \
  -d '{"name":"Temu"}'

List all boycotted companies

curl -s http://127.0.0.1:7847/list

Chrome Extension

The extension must be loaded manually (one-time setup):

1. Open chrome://extensions
2. Enable Developer mode (toggle top right)
3. Click Load unpacked
4. Select the extension/ folder from this plugin directory

The extension:

• Polls the server every 30 seconds for list updates
• Scans every page for boycotted company names and aliases
• Shows a red warning banner at the top with the company name and your reason
• Badge on the extension icon shows match count
• Works offline (falls back to cached list in chrome.storage)
• Popup UI for quick add/remove

Conversational patterns

When the user says something like:

• "Ugh, another Shein ad. Never buying from them." → Add Shein with reason "Sick of their ads"
• "Boycott Nestlé, their water practices are criminal" → Add Nestlé with reason "Criminal water practices", aliases: ["Nestle", "Nespresso", "KitKat", "Purina"]
• "Remove Temu from my boycott list" → Remove Temu
• "What's on my boycott list?" → GET /list and display

Always capture the reason — it's the key feature. The user's own words remind them why they decided to boycott when they encounter the brand later.

Suggest aliases when you know them — parent companies own many brands. Ask the user if they want to include subsidiaries.

Data

The boycott list is stored at:

~/.claude/plugins/cache/boycott-filter-marketplace/boycott-filter/1.0.0/boycott-list.json

Format:

{
  "companies": [
    {
      "name": "Temu",
      "reason": "Cheap garbage, ads everywhere",
      "aliases": ["temu.com"],
      "added_at": "2026-04-12T15:00:00Z"
    }
  ],
  "updated_at": "2026-04-12T15:00:00Z"
}

Setup

On first use, start the server:

bash ~/.claude/plugins/cache/boycott-filter-marketplace/boycott-filter/1.0.0/scripts/setup.sh

Then load the Chrome extension manually (see above).