The local exec helpers covered the development container and a throwaway
sidecar next to it, but nothing reached into an application the stack had
already deployed. Swarm had swarm-app-exec for that; compose had no
counterpart, so the only remaining route was a nested docker exec, which the
contributor rules forbid.
The helper goes through container.sh's positional form rather than its cmd
environment variable. container.sh runs that variable through `sh -lc`, so an
already-composed command would be split a second time; passing argv through
untouched leaves exactly one shell level, inside the target container.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
kevinveenbirkenbachandClaude Opus 5