I ran the same browser smoke task through two paths: direct Chrome DevTools MCP and a custom CLI skill around mcp2cli . In GitHub Copilot CLI with gpt-5. 3-codex-medium , direct Chrome DevTools MCP added about 5k tokens of upfront context before the agent did any work.
Source: [Dev.to](https://dev.to/maximsaplin/cli-over-mcp-a-small-chrome-devtools-experiment-in-copilot-cli-5gpi)