AgentNotch is a macOS menu bar application that provides real-time telemetry visibility for AI coding assistants directly within your Mac's notch area. The app monitors and displays activity from Claude Code and OpenAI Codex as they perform coding tasks, allowing developers to maintain awareness of AI assistant operations 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 input/output token usage and estimated costs in real-time. It features source-aware design with color-coded indicators (orange for Claude Code, blue for Codex, light blue for unknown sources) for visual distinction. 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 application works by receiving telemetry data via OpenTelemetry Protocol (OTLP) on port 4318. Users configure their AI coding tools to send telemetry data to this local endpoint, which AgentNotch then processes and displays visually in the menu bar. The app expands on hover to show detailed information about recent tool calls and usage metrics.

Benefits include maintaining awareness of AI assistant activities while multitasking, preventing unexpected API costs through real-time monitoring, and providing immediate visual feedback about coding assistant operations. Use cases include monitoring Claude Code and OpenAI Codex activities during development workflows, tracking token consumption for cost management, and observing AI tool execution patterns.

The target audience is developers who use AI coding assistants, specifically those working with Claude Code and OpenAI Codex on macOS systems. The app integrates with AI coding tools through OpenTelemetry Protocol and requires macOS 14.0 (Sonoma) or later, preferably on MacBook Pro 14\" or 16\" models from 2021+ with notches, though it falls back to the menu bar on other Macs.