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fix(history): raise the transcript head-read window to fit restart bookkeeping

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Blank firstPrompt rows weren't all oversized messages -- traced one
directly: a session restarted many times (mux deaths, redeploys)
accumulates a batch of small bookkeeping lines (mode/permission-mode/
last-prompt/queue-operation, one batch per restart) ahead of the real
first message. With enough restarts these alone crossed the old 16KB
head-read window, so extraction found nothing even though the actual
first message was tiny (measured case: ~17.5KB of bookkeeping pushed a
189-byte real message just past the boundary).

Raise the head buffer from 16KB to 128KB (matching the existing
precedent at the codex-history head-read a few hundred lines up) and
fix three now-stale `> 16384`/`> 65536` fallback thresholds to
reference headBuf.length instead of hardcoded numbers, so the tail-read
fallbacks stay correctly scoped to "beyond what head already covered."

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
timkjr
2026-08-05 11:11:18 -05:00
co-authored by Claude Sonnet 5
parent a2aed38073
commit 18b473f0e4
2 changed files with 49 additions and 7 deletions
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src/web/routes/session-routes.ts
+15 -7
View File
@@ -2760,7 +2760,7 @@ export function registerSessionRoutes(
let foundContent = head ? hasConversation(head) : false;
let tail: string | null = null;
if (!foundContent && fileStat.size > 16384) {
if (!foundContent && fileStat.size > headBuf.length) {
const tailBuf = Buffer.alloc(32768);
tail = await readFileTail(filePath, tailBuf, fileStat.size);
if (tail) foundContent = hasConversation(tail);
@@ -2768,7 +2768,7 @@ export function registerSessionRoutes(
if (!foundContent) continue;
if (head) firstPrompt = extractFirstUserPrompt(head);
if (!firstPrompt && fileStat.size > 65536) {
if (!firstPrompt && fileStat.size > headBuf.length) {
if (!tail) {
const tailBuf = Buffer.alloc(32768);
tail = await readFileTail(filePath, tailBuf, fileStat.size);
@@ -2778,9 +2778,9 @@ export function registerSessionRoutes(
// COD-145: last (most recent) user prompt lives near the END of the file, so
// prefer the tail. For large files where no tail was read yet, read one
// (mirrors the firstPrompt > 65536 block). Small files fit in `head`, which
// then contains the whole transcript — scan it for the last match instead.
if (!tail && fileStat.size > 65536) {
// (mirrors the firstPrompt > headBuf.length block). Small files fit in `head`,
// which then contains the whole transcript — scan it for the last match instead.
if (!tail && fileStat.size > headBuf.length) {
const tailBuf = Buffer.alloc(32768);
tail = await readFileTail(filePath, tailBuf, fileStat.size);
}
@@ -2819,7 +2819,14 @@ export function registerSessionRoutes(
app.get('/api/history/sessions', async (req) => {
const query = req.query as { projectKey?: string; offset?: string; limit?: string };
const projectsDir = join(process.env.HOME || '/tmp', '.claude', 'projects');
const headBuf = Buffer.alloc(16384);
// 128KB (was 16KB): a session restarted many times over the course of a long
// conversation accumulates small bookkeeping lines (mode/permission-mode/
// last-prompt/queue-operation, one batch per restart) ahead of the real first
// message. 16KB was enough margin for a handful of restarts but not dozens —
// a genuinely tiny first message still came up blank because the metadata
// alone crossed the window. 128KB matches the existing precedent elsewhere in
// this file (line ~1431) rather than inventing a new size.
const headBuf = Buffer.alloc(131072);
// Multi-user: this scans the host-wide ~/.claude/projects tree, so a non-admin
// must only see history whose decoded workingDir is inside their own case space.
// Do NOT trust the caller-supplied projectKey — confine on the decoded path.
@@ -2926,7 +2933,8 @@ export function registerSessionRoutes(
const history: HistoryInput[] = [];
try {
const projectsDir = join(process.env.HOME || '/tmp', '.claude', 'projects');
const headBuf = Buffer.alloc(16384);
// 128KB (was 16KB) — see the sibling allocation above for why.
const headBuf = Buffer.alloc(131072);
const projectDirs = await fs.readdir(projectsDir);
for (const projDir of projectDirs) {
const projPath = join(projectsDir, projDir);