Sigge
Sigge helps your AI assistant write copy that sounds like you, in Swedish or English. The plugin brings thirteen copy frameworks, a writing guide for each language and a check for AI-writing patterns. Your own assistant does the writing. It works right after installation, with no account and nothing to sign in to.
Sigge is a free service from AC0.
What you can ask for
| Ask | What happens |
|---|---|
| "Write a landing page for our bookkeeping firm." | write gathers the brief, picks the frameworks that fit, writes in your voice and checks the draft before you see it. |
| "Check this text for AI patterns." | check quotes each empty buzzword, false contrast and throat-clearing opener, and fixes them with the smallest possible edits. |
| "Review my sales email before I send it." | review reads the text as a copy chief would and points to the passages that need work. |
| "What can Sigge do?" | start gives a short introduction. |
You can also call a skill by name, for example /sigge:write in Claude Code.
Install
Claude Code
/plugin install sigge --marketplace Ac0AI/sigge
Claude on the web, desktop and Cowork: open Customize, then Plugins, choose Add marketplace and enter Ac0AI/sigge.
Codex
codex plugin marketplace add Ac0AI/sigge
codex plugin add sigge@sigge
ChatGPT: add https://sigge.si/mcp as a custom MCP server under Plugins, without sign-in. This gives the tools; the skills need Codex or a workspace that has imported the marketplace.
What ships with the plugin
- Thirteen frameworks, each with a table for choosing a move, named moves with example lines, a complete fictional worked example, common mistakes and links to the original sources: Hormozi, Cialdini, Schwartz, Dunford, Jobs to Be Done, Wiebe, Fogg, Ogilvy, Hopkins, James Clear and more.
- A writing guide for natural Swedish and one for English.
- A checker for AI-writing patterns in both languages. It needs Node.js; without it the assistant reads the text against the pattern list instead.
- A copy chief checklist with 25 checks.
The connection to sigge.si
The plugin also connects to https://sigge.si/mcp. It adds 59 perspectives, source search and a tool that picks frameworks for a task. It needs no account. If the connection is unavailable, the skills use what ships with the plugin.
Privacy
The skills run in your own assistant, and the bundled checker runs wherever your assistant runs it. When the assistant uses the tools at sigge.si/mcp instead, the query or text is sent there, answered and not stored; the tools are read-only and call no language model. Sigge has no accounts and sets no cookies. Full policy: sigge.si/privacy.
Limits
The frameworks and perspectives are our own applications of public material. They are not the authors' official services and are not endorsed by them. A framework is a way to think, not evidence about your product and not a promise about conversion. The pattern check finds known phrases; a clean result does not prove the text is good, and a finding does not prove an AI wrote it.
License
MIT. See LICENSE. The license does not cover the original works the sources link to. Corrections and rights questions: issues or hej@sigge.si.