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Claude Code Plugin

The official Mostly Good Metrics plugin for Claude Code. It connects Claude to your MGM projects via MCP and bundles the complete portable MGM skill set.

Install​

Inside Claude Code:

/plugin marketplace add Mostly-Good-Metrics/claude-plugin
/plugin install mostly-good-metrics@mostly-good-metrics

First run: the first time Claude calls an MGM tool, Claude Code opens your browser to sign in to Mostly Good Metrics (OAuth). No API keys or manual configuration needed — approve once and you're connected.

What you get​

The plugin connects the MGM MCP server (https://app.mostlygoodmetrics.com/mcp), giving Claude tools to query events, run and save queries, build funnels, measure retention, manage experiments, and read your dashboard. See MCP server for the full tool list.

Skills​

  • analyze-metrics — Claude uses this automatically when you ask how something is doing.
    • "How are signups trending this month?"
    • "Which platform drives the most sessions?"
  • funnel-doctor — Claude uses this automatically for conversion questions.
    • "Where do users drop off during onboarding?"
    • "Build a checkout funnel and tell me what to fix first."
  • weekly-review — produce a compact week-over-week report: WAU, signups, top-event deltas, notable movers, and one suggested action.
  • instrument-my-app — Claude uses this automatically when you want to add analytics to code.
    • "Add MGM tracking to my Flutter app."
    • "What events should I track for this signup flow?"
  • audit-instrumentation — verify event quality and diagnose missing or misleading data.
  • build-dashboard — build saved queries and useful dashboard widgets.
  • retention-cohorts — create and interpret mature retention cohorts.
  • run-experiment — plan, launch, monitor, and conclude experiments safely.

The instrument-my-app skill knows all six SDKs: Swift, Android, Flutter, JavaScript, React Native, and Capacitor.

The skill instructions are maintained in the Mostly-Good-Metrics/skills repository and work in Codex and other compatible agents too. See Agent skills for cross-agent installation.