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Hook: chained commands (cd dir && cmd) are never rewritten #112
Description
Problem
Claude Code frequently emits chained commands like:
cd /Users/me/code/project && git status
cd /some/dir && python3 -m pytest tests/ -v
cd /foo && git add . && git commit -m "msg"The hook script sets FIRST_CMD="$CMD" and then matches against patterns like ^git[[:space:]]+status. Since the full command starts with cd, none of the patterns match, and the hook silently passes through.
rtk discover shows this is the dominant source of missed savings -- 271 git status, 65 tail, 81 grep, 105 ls calls missed in 30 days of usage (~84K tokens saveable).
Fix
Extract the last command segment after && or ; for pattern matching, then reassemble the full command after rewriting:
CHAIN_PREFIX=""
FINAL_CMD="$CMD"
if [[ "$CMD" == *" && "* ]]; then
CHAIN_PREFIX="${CMD% && *} && "
FINAL_CMD="${CMD##* && }"
elif [[ "$CMD" == *" ; "* ]]; then
CHAIN_PREFIX="${CMD% ; *} ; "
FINAL_CMD="${CMD##* ; }"
fi
# ... match/rewrite against FINAL_CMD ...
# Reassemble
if [ -n "$CHAIN_PREFIX" ]; then
REWRITTEN="${CHAIN_PREFIX}${REWRITTEN}"
fiThis uses bash parameter expansion (no regex issues with && in =~).
Environment
- rtk 0.15.3
- macOS (Tahoe)
- Claude Code CLI
Reacted by PowerPress, jabbahudson and Art Shendrik
Activity
ahundt commentedon Feb 14, 2026
I have hooks that do this, it is actually harder than that to do correctly. You have to use an bash lexer to actually parse the commands and determine if a given chunk is actually a command or part of other commands and params. There are also edge cases like heredocs and comments and many more to get it right.
feat: add hybrid command engine with safe execution
ahundt commentedon Feb 15, 2026
Hey @Rmohid I've implemented this request in #131 if you can give it a try let me know what you think!
F0rty-Tw0 commentedon Feb 16, 2026
I had the same issue, and just updated my RTK hooks to catch that.
feat: add Rust-based hook engine with chained command rewriting
pszymkowiak commentedon Feb 17, 2026
Tracked in PR #156 (Hook Engine + Chained Command Rewriting).
Rmohid commentedon Feb 18, 2026
Verified fix: PR #156 adds Rust hook engine with lexer/chain parser.
cd /tmp && git statuscorrectly rewrites tocd /tmp && rtk git status. Build passes, 541 tests pass (336 in hook engine, 15 chain-specific). PR #150 also handles this case.feat: add Rust-based hook engine with chained command rewriting
feat: add Rust-based hook engine with chained command rewriting
feat: add Rust-based hook engine with chained command rewriting
feat: add hybrid command engine with safe execution
feat: add Rust-based hook engine with chained command rewriting