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fix: strip ANSI escape codes from session persistence hooks (#642) (#684)

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Windows terminals emit control sequences (cursor movement, screen
clearing) that leaked into session.tmp files and were injected
verbatim into Claude's context on the next session start.

Add a comprehensive stripAnsi() to utils.js that handles CSI, OSC,
charset selection, and bare ESC sequences. Apply it in session-end.js
(when extracting user messages from the transcript) and in
session-start.js (safety net before injecting session content).
This commit is contained in:
Affaan Mustafa 2026-03-20 01:38:11 -07:00 • committed by GitHub
parent 9a478ad676
commit 28de7cc420
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4 changed files with 87 additions and 3 deletions
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6
scripts/hooks/session-end.js
View file

@ -21,6 +21,7 @@ const {
readFile,
writeFile,
runCommand,
stripAnsi,
log
} = require('../lib/utils');
@ -58,8 +59,9 @@ function extractSessionSummary(transcriptPath) {
: Array.isArray(rawContent)
? rawContent.map(c => (c && c.text) || '').join(' ')
: '';
if (text.trim()) {
userMessages.push(text.trim().slice(0, 200));
const cleaned = stripAnsi(text).trim();
if (cleaned) {
userMessages.push(cleaned.slice(0, 200));
}
}

4
scripts/hooks/session-start.js
View file

@ -15,6 +15,7 @@ const {
findFiles,
ensureDir,
readFile,
stripAnsi,
log,
output
} = require('../lib/utils');
@ -42,7 +43,8 @@ async function main() {
const content = readFile(latest.path);
if (content && !content.includes('[Session context goes here]')) {
// Only inject if the session has actual content (not the blank template)
output(`Previous session summary:\n${content}`);
// Strip ANSI escape codes that may have leaked from terminal output (#642)
output(`Previous session summary:\n${stripAnsi(content)}`);
}
}