Chat Customizations Editor

This handles the split-view management UI where you configure agents, skills, instructions, hooks, prompts, MCP servers, and plugins across workspace, user, and extension storage. It filters by harness (Local, Copilot CLI, Claude) and follows a strict pattern: all UI behavior is driven by declarative harness descriptors, so widget code stays clean of conditionals. The architecture is interesting because it bridges VS Code's extension API down through IPC to internal interfaces, meaning any change to customization items ripples through five layers. You'll spend time in the spec at `AI_CUSTOMIZATIONS.md` and the component fixtures, which include CI-blocking screenshot tests that catch layout regressions automatically. Useful when you're wiring up new customization types or debugging why a particular harness isn't showing the storage sources you expect.

skills.sh installs: 212
GitHub stars: 195.3K
last updated: Aug 21, 2026

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Install

$ npx -y skills add microsoft/vscode --skill chat-customizations-editor --agent claude-code

Installs into .claude/skills of the current project.

Files

Chat Customizations Editor

Split-view management pane for AI customization items across workspace, user, extension, and plugin storage. Supports harness-based filtering (Local, Copilot CLI, Claude).

Spec

src/vs/sessions/AI_CUSTOMIZATIONS.md — read for ownership and interface contracts. Update it only when those contracts change; behavior and regressions belong in focused tests.

Key Folders

Folder	What
`src/vs/workbench/contrib/chat/common/`	`ICustomizationHarnessService`, `ISectionOverride`, `ICustomizationItemProvider` — shared interfaces
`src/vs/workbench/contrib/chat/browser/aiCustomization/`	Management editor, list widgets (prompts, MCP, plugins), harness service registration
`src/vs/sessions/contrib/chat/browser/`	Sessions-window overrides (harness service, workspace service)
`src/vs/sessions/contrib/sessions/browser/`	Sessions tree view counts and toolbar