Gemini CLI Monitoring & Observability

Gemini CLI has the most complete OTel implementation — logs, traces, and metrics with GenAI semantic convention compliance. Optelly captures token usage, thinking tokens, tool calls, lines changed, model routing, and multi-agent sessions.

What You Get

Token & Thinking Metrics

Track input, output, cached, and thinking tokens per request. See how much reasoning your Gemini agent does — unique visibility into extended thinking.

Rich Tool Tracking

See every tool call — file reads, edits, shell commands, grep searches, and even Google web searches — with duration, success status, and accept/reject decisions.

Session Timelines & Agent Lifecycle

Track full session history including agent start/finish events, model routing switches, conversation turn counts, and total session duration. Up to 90-day retention on Pro.

Lines of Code & Full OTel

Track lines added and removed per session. Gemini CLI exports logs, traces, and metrics natively — Optelly connects with one command, no proxy required.

Setup in 30 Seconds

1. Install

Run npx optelly setup — this configures the OTel environment variables that Gemini CLI reads automatically.

2. Code

Launch Gemini CLI as usual. Telemetry is exported automatically via OpenTelemetry — no changes to your workflow.

3. Watch

Open optelly.com to see your Gemini agent in the office. Track costs, tokens, and session activity live.

Get Started — Free

npx optelly setup

Also works with Claude Code and Codex