On macOS (bash 3.2 and certain Homebrew builds), sourcing a file
containing declare -x statements prints each declaration to stdout.
The session snapshot (written by export -p) is full of these, so
every command execution prepends ~60 lines of env vars into the LLM's
context window, wasting tokens and potentially exceeding context
limits (issue #15459).
Fix: redirect both stdout and stderr to /dev/null when sourcing the
snapshot. The source builtin still sets the variables in the current
shell — only the print output is suppressed. On Linux this is already
silent, so the redirect is harmless.
Fixes#15459
Sanjay Santhanam
a52ed70608