TL;DR The hidden trail : Cursor, Claude Code, and GitHub Copilot store credentials across config files, env variables, logs, shell history, and temp files that repository and CI scanners never inspect. The evidence : GitGuardian's State of Secrets Sprawl 2026 found 24,008 unique secrets in public MCP configuration files, 2,117 of them valid, plus a 3.2% leak rate in Claude Code-assisted commits. The fix : GitGuardian Developer Endpoint Protection discovers this trail fleet-wide w...