Add performance workflow and heap-snapshot-analysis skills#308834
Merged
roblourens merged 5 commits intomainfrom Apr 9, 2026
Merged
Add performance workflow and heap-snapshot-analysis skills#308834roblourens merged 5 commits intomainfrom
roblourens merged 5 commits intomainfrom
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Add two agent skills for memory/performance investigations: - vscode-performance-workflow: Drives repeatable VS Code scenarios, captures heap snapshots, and includes bundled chat smoke runners (chat-memory-smoke, chat-session-switch-smoke). - heap-snapshot-analysis: Parses V8 heap snapshots, compares before/after, and traces retainer paths. Both skills include scratchpad folders (gitignored) for one-off investigation scripts organized in dated subfolders with findings.md. (Written by Copilot)
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Pull request overview
Adds two new agent skills intended to support repeatable VS Code performance/memory investigations and V8 heap snapshot analysis, along with Playwright-based smoke runners and helper modules for snapshot parsing/diffing/retainer-path tracing.
Changes:
- Introduces a “vscode-performance-workflow” skill with documented investigation workflow plus bundled automation runners (chat memory smoke + session switching) and a user-data profile utility.
- Introduces a “heap-snapshot-analysis” skill with helpers to parse heap snapshots, compare before/after snapshots, and trace retainer paths, plus a scratchpad convention.
- Adds a standalone
scripts/chat-memory-smoke.mtsrunner at repo root.
Show a summary per file
| File | Description |
|---|---|
| scripts/chat-memory-smoke.mts | Adds a repo-root Playwright+CDP chat memory smoke runner that collects heap metrics and optional heap snapshots. |
| .github/skills/vscode-performance-workflow/SKILL.md | Documents the end-to-end performance workflow and how to use the bundled runners/scratchpad. |
| .github/skills/vscode-performance-workflow/scripts/chat-memory-smoke.mts | Adds a skill-scoped chat memory smoke runner with shared persistent profile + seed-copy support. |
| .github/skills/vscode-performance-workflow/scripts/chat-session-switch-smoke.mts | Adds a skill-scoped runner that creates multiple chat sessions and repeatedly switches between them while sampling heap. |
| .github/skills/vscode-performance-workflow/scripts/userDataProfile.mts | Adds a utility to prepare/copy user-data profiles (including seed-copy with cache/log exclusions). |
| .github/skills/vscode-performance-workflow/scratchpad/README.md | Documents scratchpad structure and usage tips for one-off investigations. |
| .github/skills/vscode-performance-workflow/scratchpad/.gitignore | Git-ignores scratchpad contents while keeping README/.gitignore. |
| .github/skills/heap-snapshot-analysis/SKILL.md | Documents snapshot analysis workflow and how to use helper modules. |
| .github/skills/heap-snapshot-analysis/helpers/parseSnapshot.ts | Adds a heap snapshot parser and graph builder for traversal/retainer analysis. |
| .github/skills/heap-snapshot-analysis/helpers/compareSnapshots.ts | Adds snapshot comparison (grouped by constructor) and console reporting helpers. |
| .github/skills/heap-snapshot-analysis/helpers/findRetainers.ts | Adds direct-retainer and retainer-path search utilities. |
| .github/skills/heap-snapshot-analysis/scratchpad/README.md | Documents scratchpad conventions and example imports for analysis scripts. |
| .github/skills/heap-snapshot-analysis/scratchpad/.gitignore | Git-ignores scratchpad contents while keeping README/.gitignore. |
Copilot's findings
- Files reviewed: 13/13 changed files
- Comments generated: 11
.github/skills/auto-perf-optimize/scripts/chat-session-switch-smoke.mts
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.github/skills/heap-snapshot-analysis/helpers/compareSnapshots.ts
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(Written by Copilot)
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dmitrivMS
approved these changes
Apr 9, 2026
benvillalobos
approved these changes
Apr 9, 2026
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Add two agent skills for driving memory/performance investigations:
vscode-performance-workflowDrives repeatable VS Code scenarios, captures renderer heap snapshots, and provides bundled automation runners:
The skill documents the full workflow: define scenario → develop automation → fast smoke → targeted snapshots → verify → analyze → fix → document. Includes guidance on safety (real machine, not sandboxed), auth/profile management, agent-browser observation, and scratchpad organization.
heap-snapshot-analysisParses V8 heap snapshots, compares before/after, and traces retainer paths. Provides helper modules:
Scratchpad convention
Both skills include gitignored
scratchpad/folders for one-off investigation scripts, organized in dated subfolders (YYYY-MM-DD-short-description/) with afindings.mddocumenting all ideas, decisions, and outcomes.(Written by Copilot)