← Daily Brief for September 18, 2026
GitHub exposes which Copilot CLI skills, agents, MCP servers, commands, and plugins are actually used
Focus: Technical AI Engineering
Date: September 17, 2026
Topics: agent observability, Copilot CLI, Agent Skills, MCP, plugins, usage metrics
Evidence: Official Announcement
Availability: General Availability
Summary: GitHub expanded the Copilot usage metrics API with CLI customization telemetry. Reports can now show top-used skills, custom agents, MCP servers, slash commands, and plugins plus counts of how many distinct items are being used; customer-defined names are grouped to protect privacy.
Why it matters: Agent customization is becoming an operational layer that needs the same observability as models and prompts. Teams can now distinguish a large catalog of configured assets from the smaller set people actually invoke, identify enablement gaps, and measure whether reusable agent components are spreading.
What to do now
Measure reuse before expanding the catalog: Track which reusable agent assets are invoked, how broadly they spread, and whether high-use assets also pass quality and outcome checks before investing in more customizations.
Source: Agentic CLI customizations now in the usage metrics API