Greptile Summary

This PR optimizes Pi session token usage by skipping the resolveBootstrapContextForRun() call (~35k tokens) on continuation messages, gating it behind a single fs.stat(params.sessionFile) check (isFirstMessage). The duplicate fs.stat concern flagged in the prior review has been cleanly resolved by reusing isFirstMessage as hadSessionFile.

• The repairSessionFileIfNeeded function only repairs existing files and never creates or deletes the session file, confirming hadSessionFile = !isFirstMessage is semantically equivalent to the original fresh fs.stat check.
• workspaceNotes is now undefined on every continuation turn — it is derived from the empty hookAdjustedBootstrapFiles and controls the "Reminder: commit your changes after edits" line that is injected into the system prompt. Since the system prompt is regenerated on each turn, this reminder will be missing from all follow-up messages. The PR description states "no behavioral change", but this is a real change to the system prompt content on continuation turns that needs to be verified as intentional.

Confidence Score: 3/5

• Core optimization is correct, but a side-effect on workspaceNotes needs verification before merging.
• The isFirstMessage / hadSessionFile consolidation is logically sound and the prior duplicate-stat concern is resolved. The unresolved issue is that workspaceNotes — the system-prompt reminder to commit workspace changes — is now derived from the always-empty hookAdjustedBootstrapFiles on continuation turns, silently removing it from the system prompt for all follow-up messages. Whether this is intentional needs confirmation, since the system prompt is not persisted in the session file and must include anything the model needs on every turn.
• src/agents/pi-embedded-runner/run/attempt.ts — the workspaceNotes derivation at lines 1296-1300 should be reviewed for correctness on continuation turns.

This is a comment left during a code review.
Path: src/agents/pi-embedded-runner/run/attempt.ts
Line: 1296-1300

Comment:
**`workspaceNotes` silently dropped from system prompt on continuation turns**

`workspaceNotes` (the "Reminder: commit your changes in this workspace after edits." line) is derived from `hookAdjustedBootstrapFiles`, which is now always `[]` on continuation messages. As a result, `workspaceNotes` will be `undefined` for every continuation turn and the reminder will be absent from the system prompt for those requests.

The system prompt is regenerated from scratch on every turn — it is not stored in the session file and replayed — so any content that should appear on all turns must be included unconditionally. If the `workspaceNotes` reminder needs to remain in the system prompt for continuation messages (so the model is consistently reminded to commit after edits), the guard must be evaluated independently of the bootstrap-file check, for example:

```typescript
// Evaluate once from the original bootstrap files so it is present on all turns,
// not just the first message.
const workspaceNotes = isFirstMessage
  ? hookAdjustedBootstrapFiles.some(
      (file) => file.name === DEFAULT_BOOTSTRAP_FILENAME && !file.missing,
    )
    ? ["Reminder: commit your changes in this workspace after edits."]
    : undefined
  : params.workspaceHasBootstrapFile  // pass this flag through params, or derive another way
  ? ["Reminder: commit your changes in this workspace after edits."]
  : undefined;
```

If the intent is that this reminder is only needed for the first turn (because it is already present in the session history from the first turn's system prompt), please add a comment explaining that, since the system prompt is not currently stored in session history in a way that would make it available on continuation turns.

How can I resolve this? If you propose a fix, please make it concise.

_{Last reviewed commit: d228f31}

Addressed in d228f31 — replaced the duplicate fs.stat call at line 1364 with const hadSessionFile = !isFirstMessage, eliminating the redundant filesystem round-trip and keeping the two variables explicitly in sync. Added a linking comment at the isFirstMessage declaration.

Also rebased on latest main.

@greptile-apps anything else?

@codex Re: detecting first turn from transcript content rather than file existence — acknowledged. The current approach (!isFirstMessage from fs.stat) is consistent with the existing pattern at line 1083 and works correctly for the normal flow where the session file is created on first message. Pre-created or partially-written session files from crash recovery are an edge case that would need the SessionManager to expose a "has prior turns" check, which is a larger refactor. Noting this as a potential follow-up.

The duplicate fs.stat call was consolidated as suggested — now reuses the isFirstMessage result computed earlier.

Anything else to address?

Rebased onto latest upstream/main.