AgentNotch is a macOS menu bar application that provides real-time visibility into AI coding assistants by displaying telemetry data directly in your Mac's notch area. The app monitors AI coding tools like Claude Code and OpenAI Codex, allowing developers to see what their AI assistants are doing without interrupting their workflow.

Key features include real-time tool tracking that shows every tool call as it happens, including file reads, code edits, and shell commands. The app provides token and cost monitoring to track token usage and estimated costs in real-time. It features source-aware design with color-coded indicators: orange for Claude Code, blue for Codex, and light blue for unknown sources. Completion detection notifies users when AI assistants finish tasks, and the app is lightweight and native, living in the Mac's notch without using screen real estate.

The app works by receiving telemetry data via OpenTelemetry Protocol (OTLP) on port 4318. Users configure their AI tools to send telemetry to this local endpoint, and AgentNotch displays the incoming data visually in the notch area. The app expands on hover to show detailed information about recent tool calls and usage statistics.

Benefits include never being surprised by API bills due to real-time cost monitoring, knowing exactly what AI assistants are doing at any moment, and maintaining workflow efficiency by avoiding context switching. Use cases include monitoring AI coding sessions, tracking API usage costs, and debugging AI tool behavior during development work.

The target audience is developers who use AI coding assistants, specifically those working with Claude Code and OpenAI Codex on macOS systems. The app requires macOS 14.0 (Sonoma) or later and works best on Macs with notches, though it falls back to the menu bar on other Macs. It integrates with AI tools through OpenTelemetry Protocol and runs entirely locally without sending data externally.