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harden: scope entrypoint detection to message lines, add fallback coverage

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Two follow-ups from reviewing the entrypoint-filter and head-buffer
fixes before submitting them upstream:

1. extractTranscriptEntrypoint() scanned any line containing the
   substring "entrypoint", not specifically the first "type":"user"/
   "type":"assistant" message line (unlike its sibling
   extractFirstUserPrompt, which does scope to type). A transcript
   that started under an older Claude Code version (no entrypoint
   field) and got resumed under a newer one mid-conversation could
   pick up the field from a much later message than the true first
   one, misattributing the session's origin. Scoped it to match.

2. Added a regression test proving the tail-read fallback still
   engages correctly when bookkeeping accumulation exceeds even the
   new 128KB head window, not just the 16KB it previously blanked at.

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 18b473f0e4
commit 251706be3b
2 changed files with 87 additions and 1 deletions
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src/web/routes/session-routes.ts
+11 -1
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@@ -2462,6 +2462,13 @@ export function registerSessionRoutes(
* an SDK/automated invocation. Used to exclude non-interactive transcripts
* (CI review bots, etc.) from the resumable history list — they were never
* something a user can resume into.
*
* Scoped to `"type":"user"`/`"type":"assistant"` lines specifically, mirroring
* `extractFirstUserPrompt`'s type check, rather than any line that happens to
* contain the substring "entrypoint". A transcript that started under an older
* Claude Code version (no entrypoint field) and got resumed under a newer one
* mid-conversation could otherwise pick up the field from a much later message
* than the true first one, misattributing the session's origin.
*/
function extractTranscriptEntrypoint(text: string): string | undefined {
let start = 0;
@@ -2469,10 +2476,13 @@ export function registerSessionRoutes(
const end = text.indexOf('\n', start);
const line = end === -1 ? text.slice(start) : text.slice(start, end);
start = end === -1 ? text.length : end + 1;
if (!line.includes('"type":"user"') && !line.includes('"type":"assistant"')) continue;
if (!line.includes('"entrypoint"')) continue;
try {
const entry = JSON.parse(line);
if (typeof entry.entrypoint === 'string') return entry.entrypoint;
if ((entry.type === 'user' || entry.type === 'assistant') && typeof entry.entrypoint === 'string') {
return entry.entrypoint;
}
} catch {
// Malformed/truncated line — skip
}