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SKILL.md
Boycott Filter
Manage a personal boycott list conversationally. Users complain about brands, the agent adds them to a local list with their reason, and a Chrome extension warns them on any page from those brands — displaying their own words back to them.
Overview
This skill is the conversational layer of a 3-part system:
This skill (Claude Code) — understands user intent, calls the local API
Local sync server (scripts/server.js, port 7847) — stores the list, serves it to the extension
Chrome extension (extension/) — scans pages, shows the warning banner
The user's value: they complain ONCE, they're reminded FOREVER — in their own voice, with their own reason. No more accidental clicks on brands they'd decided to stop supporting.
Prerequisites
Node.js 18+ installed
Chrome (or any Manifest V3 browser) with the bundled extension loaded manually (see README)
The local sync server must be running on port 7847
Check with:
curl -s http://127.0.0.1:7847/health
If not running, ask the user to run setup once in a terminal (the skill itself only has curl permission, by design — see README for security rationale):
bash ${CLAUDE_PLUGIN_ROOT}/scripts/setup.sh
Tell the user: "The boycott server isn't running. Open a terminal and run: bash ${CLAUDE_PLUGIN_ROOT}/scripts/setup.sh — that starts the local server and shows you how to load the Chrome extension. Then ask me again."
Instructions
When the user wants to ADD a brand
Detect phrases like:
"I'm done with X"
"Never buying from X again"
"Boycott X"
"Add X to my boycott list"
"Sick of X"
Extract:
Brand name (the thing they want to avoid)
Reason (their own words — critical, this is what will be shown back to them)
Aliases (optional — if you know subsidiaries, offer them: Nestlé → Nespresso, KitKat, Purina, etc.)
Keep the reason in the user's voice — don't paraphrase into corporate language. If they said "cheap garbage everywhere", store "cheap garbage everywhere" — not "low quality products with aggressive advertising".
If the user didn't give a reason, ask: "Got it. Any specific reason you want to remember why you decided to boycott?"
- Nestlé (+ Nespresso, KitKat): "Water extraction in drought zones"
When the user asks about the extension
Explain that the Chrome extension needs to be loaded manually once:
Open chrome://extensions
Enable Developer mode
Click "Load unpacked"
Select: ${CLAUDE_PLUGIN_ROOT}/extension/
After that, it auto-syncs every 30 seconds from the local server.
Output
Confirmation messages for add/remove actions — include the exact reason captured
List displays grouped by company with reasons visible
Server status if asked
For add, confirm like:
"Added Temu to your boycott list. Reason: cheap garbage, ads everywhere. You'll see a red banner next time you land on temu.com or any page mentioning Temu."
API reference (the local server)
Method
Endpoint
Body
Returns
GET
/list
—
{"companies":[...], "updated_at":"..."}
POST
/add
{"name","reason","aliases":[]}
{"ok":true, "list":{...}}
DELETE
/remove
{"name"}
{"ok":true, "list":{...}}
GET
/health
—
{"status":"ok", "companies":N}
Error Handling
Server not running (connection refused on port 7847): run the setup script. Don't silently fail — tell the user.
Brand already on list: server returns 409, tell the user gracefully ("Already on your list, reason: ...").
Brand not found on removal: server returns 404, tell the user it wasn't on the list.
Invalid JSON: server returns 400. Should not happen if the skill constructs the body correctly.
Examples
Example 1: Add with reason (most common)
User: "Ugh, another Shein ad. Never buying from them, fast fashion is killing everything."
Agent action:
curl -s -X POST http://127.0.0.1:7847/add \
-H 'Content-Type: application/json' \
-d '{"name":"Shein","reason":"fast fashion is killing everything","aliases":["shein.com","SHEIN"]}'
Response: "Added Shein. Next time you land on a page mentioning them, you'll see your reason: 'fast fashion is killing everything'."
Example 2: Parent + subsidiaries
User: "Boycott Nestlé, their water extraction practices in drought zones are criminal."
Agent action:
curl -s -X POST http://127.0.0.1:7847/add \
-H 'Content-Type: application/json' \
-d '{"name":"Nestlé","reason":"water extraction practices in drought zones are criminal","aliases":["Nestle","Nespresso","KitKat","Purina","Perrier","San Pellegrino"]}'
Response: "Added Nestlé with their main subsidiaries (Nespresso, KitKat, Purina, Perrier, San Pellegrino). The extension will match any of these. Want me to add more? Nestlé owns ~2,000 brands."
Example 3: List view
User: "What's on my boycott list?"
Agent action:
curl -s http://127.0.0.1:7847/list
Response formatting:
You're currently boycotting 3 brands:
Temu — "Cheap garbage, ads everywhere"
Shein — "Fast fashion is killing everything"
Nestlé (+ Nespresso, KitKat, Purina, Perrier) — "Water extraction practices in drought zones are criminal"
Example 4: Remove
User: "Actually remove Temu, I need something urgent from there."
