Sigrid AI Toolkit

A Claude Code plugin marketplace for Sigrid integrations (documentation).

Sigrid MCP integrations can be used to leverage Sigrid's capabilities from AI Coding Assistants, Agents and other MCP-based LLM tools.

• Guardrails: Leverage Sigrid's code analysis to prevent AI Coding Assistants from introducing security and other quality issues
• Auto-fix agents: Use data from Sigrid to let AI Coding Agents auto-fix and improve existing quality issues at scale

The sigrid plugin

The plugin auto-configures the Sigrid MCP server (guardrails + auto-fix data) and ships skills for diagnosing and improving code quality — the auto-fix agents.

Skill	What it does
setup	Sets up your Sigrid profile (customer, system, conventions). Run this first.
sigrid-diagnose	Identifies your weakest maintainability property and surfaces high-leverage refactoring candidates
sigrid-improve	Executes refactoring candidates with guardrail verification
change-feedback	Runs Sigrid CI locally and returns structured quality feedback
architecture-drift	Flags architecture drift introduced by an in-progress change, grounded in Sigrid's architecture graph
fix-osh-risk	Remediates open source health findings — opens change requests or researched issues
resolve-security-findings	Triages and/or fixes security findings

Auto-run guardrails hook

The plugin automatically runs the guardrails check on production-code files as Claude edits them. It's on by default; turn it off via /plugin → Installed → sigrid → Configure options → Auto-run guardrails check.

Prerequisites

• Claude Code
• A Sigrid API token (sigrid-says.com)

Install

1. Install the Sigrid plugin marketplace

   /plugin marketplace add Software-Improvement-Group/sigrid-ai-toolkit
   

2. Install the plugin

   /plugin install sigrid@sigrid-ai-toolkit
   

   You'll be prompted for your Sigrid API token on first use. The token is stored securely in your system keychain.

3. Set up your profile

   /sigrid:setup
   

   This interviews you for your Sigrid customer/system and conventions, and writes them to a profile the skills read. The profile lives outside the plugin, so it survives updates.

4. Enable auto-update (recommended)

How to: Enable auto-update

We regularly add improvements and new features. To ensure you get these updates automatically:

• /plugin to enter the plugin overview
• Navigate to Marketplaces
• Navigate to sigrid-ai-toolkit and press enter to select
• Navigate to Enable auto-update and press enter to enable

Claude Code will now automatically update the Sigrid plugin for you.

Usage

See the Sigrid MCP documentation for MCP usage. Each skill has its own README.md under sigrid/skills/.

Customization — profile, not fork

Adapt the plugin by configuring, not forking. In order of preference (only the last loses clean updates):

1. Run /sigrid:setup → writes your profile. Survives /plugin update.
2. Edit the profile (${CLAUDE_PLUGIN_DATA}/CLAUDE.md, i.e. ~/.claude/plugins/data/sigrid-sigrid-ai-toolkit/CLAUDE.md) or connect a different git-host MCP. Survives updates.
3. Fork a SKILL.md → the escape hatch for rewriting a procedure. You then own updates to it.