[UtkarshUsername]

Problem

Every sidebar inbox observation converts tracker state into two temporary arrays of entries just to copy working-state flags into a snapshot Map.

Change

Populate the snapshot Map directly. Observations still own a separate snapshot, so later tracker updates cannot change earlier answers.

Scope and approval

Small, focused removal of redundant intermediate allocations under CONTRIBUTING.md's focused-fix exception. No new cache, contract, setting, or intentional product behavior change.

Verification

Sampled allocation bytes per complete inbox observation:

Workload	Before	After	Reduction
100 idle threads	69,912	48,414	30.7%
1,000 idle threads	650,397	437,387	32.8%
1,000 working threads	650,228	433,209	33.4%

• Node 26.12.1/Windows, Vite-built helper, three separate allocation profiles per arm. Measured independently against upstream main; does not depend on perf(client): skip idle inbox placement serialization #27460.
• Five isolated A/B timing trials plus five paired A/A controls. Timing is inconclusive against baseline variation; no speedup claim. GC totals generally fell in separate probes; one whole-process diagnostic recorded a higher maximum pause (8.10 → 9.76 ms, including warmup and forced GCs). Peak RSS varied. No retained-memory or GC-pause guarantee.
• All 22 existing inbox tests and 115,200 generated thread-state comparisons pass, including saved-observation isolation, deadlines, notifications, placement changes, and working transitions.
• Targeted formatting/lint and client-runtime, desktop, and scripts typechecks pass. The same pre-existing web typecheck errors for two missing secret-provider packages remain. Browser rendering was not measured.
• Final committed source matches the measured candidate.

Model: gpt-6.1-sol. Harness: Codex in T3 Code.

[macroscopeapp]

Approvability

Verdict: Approved at 90e3623

Macroscope's review found this PR approvable — Inbox snapshots now populate their Map directly, avoiding temporary arrays while retaining independent snapshot values. The change leaves product behavior and defaults unchanged and presents no obvious material risk.

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[coderabbitai]

No actionable comments were generated in the recent review.

Recent review info

Run configuration

• Source mode: Auto
• Repository: pingdotgg/t3code
• Branch: main
• File: .coderabbit.config.ts
• Commit: 305a90d
• Layers: Repository TS config
• Review profile: CHILL
• Plan: Advanced
• Run ID: a5f98a84-ef0c-4e9a-8548-847352a575ea

Commits

Reviewing files that changed from the base of the PR and between 305a90d and 90e3623.

Files selected for processing: 1

• packages/client-runtime/src/state/threadInbox.ts

Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 8 remain after this review.

Walkthrough

createInboxReturnTracker.observe now builds its observed working-state map by iterating over thread states. The resulting key-value mapping remains unchanged.

Changes: Inbox snapshot

Layer / File(s)	Summary
Build observed snapshot packages/client-runtime/src/state/threadInbox.ts	observedWorking is populated by iterating over states and storing each state’s working value by key.

Priority: Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Refactor

Possibly related PRs

• pingdotgg/t3code#22458: Introduces the tracker’s per-thread state and Working-placement grace behavior.
• pingdotgg/t3code#24760: Establishes the tracker state and snapshot-stable observe result.
• pingdotgg/t3code#27460: Also changes allocation behavior in createInboxReturnTracker.observe.

Suggested reviewers: t3dotgg, macroscopeapp

Merge Risk: Minimal · up to 90e36

No merge-blocking behavior change was found in this focused allocation optimization.

Pre-merge checks: 4

Check name	Status	Explanation
Title check		The title clearly and concisely describes the main change: removing temporary arrays during inbox snapshot creation. It uses a conventional commit format and matches the changeset.
Description check		The description includes all required sections: Problem, Change, Scope and approval, and Verification. It explains the focused fix, reports measured allocation results, documents test and typecheck re…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Description check

Explanation

The description includes all required sections: Problem, Change, Scope and approval, and Verification. It explains the focused fix, reports measured allocation results, documents test and typecheck results, and identifies known pre-existing errors and limitations.

Finishing Touches

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