Claude Desktop — Feature Flags

Claude Desktop feature flag system, extracted via ASAR bundle analysis + runtime introspection (CDP).

System Architecture

claude.ai /api/desktop/features ──→ GrowthBook (custom wrapper)
                                        │
                                        ▼
                              ct("ID") checks in code
                                        │
                        ┌───────────────┼───────────────┐
                        ▼               ▼               ▼
                  desktopBootFeatures  $3i (dynamic)   V3i (hardcoded)
                   (39 capabilities)   (model-based)   (1p-only, 9 flags)

Feature Sources

Source	Description	Count
fcache (disk)	Local cache at `~/Library/Application Support/Claude/fcache`	189 features
V3i	Hardcoded 1p — returned by `hardcodedMainGrowthBookFeatures()`	9 features
$3i	Dynamic — generated from `buildConfig()` and `supports1mContextModels()`	29 features
desktopBootFeatures	Named capabilities passed to renderer	39 features

Feature Format

{
  "2976814254": {
    "value": true,
    "on": true,
    "off": false,
    "source": "force",
    "experiment": null,
    "experimentResult": null
  }
}

source: "force" — hardcoded in code (1p)
source: "defaultValue" — $3i default
source: "server" — came from /api/desktop/features endpoint

3p Flow

hardcodedMainGrowthBookFeatures() → null
  → fetch GET /api/desktop/features (from configured server)
    → cache in fcache (gzip, 24h TTL)
      → ct() checks

1p Flow

hardcodedMainGrowthBookFeatures() → V3i (9 hardcoded features)
  → fetch GET /api/desktop/features (from claude.ai)
    → merge with V3i
      → ct() checks

Identified 3p Stubs

Stub	Function	Impact
`_vt()`	`return Promise.resolve({})`	Voice skill never loads
`y4n`	`Object.freeze({__proto__:null})`	Empty Echo MCP server
`hardcodedMainGrowthBookFeatures()`	`return null`	No 1p features

Named Features

⭐ V3i — Hardcoded 1p (forces `on:true`)

ID	Name	Function
`2976814254`	`ccd-builtin-tools`	Built-in MCP tools + preview server
`3246569822`	`can-save-skill`	Enables "Save Skill" button in UI
`1143815894`	`force-disable-host-loop`	Forcefully disables host loop
`123929380`	`memory-reflect-skill`	Memory reflection skill
`1696890383`	`cowork-memory-guidelines`	Cowork memory path + guidelines
`2307090146`	`plugin-oauth-storage`	OAuth credential storage for plugins
`2940196192`	`louder-panda-beta`	Louder Panda beta feature
`3732274605`	`chilling-sloth-beta`	Chilling Sloth beta feature
`1978029737`	`cowork-native-file-preview`	Native file preview in Cowork

🧠 Voice (`1985784543`)

Name: voice:setup-voice-skill
1p: Active (confirmed by protocol captures)
3p: BLOCKED — feature not in cache + _vt() is a stub
Module: getSetupVoiceSkill() via await _vt() — returns undefined in 3p
To activate: Replace stub _vt + return feature on:true

🖥️ Computer Use (`4116586025`)

Name: computer-use-availability
1p: supported
3p: NOT in cache
Dependency: Purely local (ct() + platform check)

🛠️ Skills

ID	Name	1p	3p
`123929380`	`memory-reflect-skill`	on (V3i)	off
`1824824999`	`skill-custom-description`	?	off
`1004628546`	`memory-reflect-config`	on	on
`4066504968`	`cowork-setup-config`	on	on
`2800354941`	`skill-sort-alpha`	?	on

🔌 Plugins

ID	Name	1p	3p
`4274871493`	`plugin-sync-v2`	on (force)	on (force)
`3633961296`	`plugin-backfill-migration`	on (force)	on (force)
`1609612026`	`plugin-account-enabled`	on (force)	on (force)
`720735283`	`plugin-stale-check`	on (force)	on (force)
`3758515526`	`plugin-marketplace-config`	on	on

🖥️ VM & Cowork

ID	Name	1p	3p
`4160352601`	`vm-heartbeat-restart`	on	off
`2339084909`	`vm-heartbeat-simple`	on (force)	on (force)
`4141490266`	`cowork-additional-tools`	?	off
`3371831021`	`cowork-cu-only-mode`	?	off

⏰ Scheduler

ID	Name	1p	3p
`3516166472`	`wake-scheduler-feature`	unavailable	on
`3300773012`	`scheduler-offline-gate`	?	off
`2893011886`	`scheduler-battery-interval`	?	on

🔐 OAuth / Auth

ID	Name	1p	3p
`2438134137`	`oauth-design-scope`	?	off
`2392971184`	`oauth-sessions-scope`	on (force)	on (force)

desktopBootFeatures — 39 Named Capabilities

Extracted from 1p webview via window.desktopBootFeatures:

Supported (24)

nativeQuickEntry, quickEntryDictation, quickEntryGlobalShortcut, customQuickEntryDictationShortcut, chillingSlothFeat, chillingSlothEnterprise, chillingSlothLocal, yukonSilver, yukonSilverGems, yukonSilverGemsCache, desktopTopBar, ccdPlugins, computerUse, tearOffHalo, coworkArtifactPopout, claudeDesignWindow, coworkRemoteSessionSpaces, coworkBranchSession, bootstrapConfig, chatIn3p, builtinMcpPresets, chatTab [beta]

Unavailable (15)

artifactsPane, plushRaccoon, quietPenguin, chillingSlothPool, wakeScheduler, coworkKappa, coworkArtifacts, markTaskComplete, framebufferPreview, iosSimulator, androidEmulator, iosSimulatorH264, grandPrix, grandPrixRequest, surfaceTogglesPreview, chatCodeExecution, epitaxyMcpApps

Name → Numeric ID Mapping

Named Feature	Numeric ID	Resolver
`chillingSlothFeat`	`1928275548`	`DHr()` → `ct("1928275548")`
`chillingSlothLocal`	`2115990222`	`SHr()` → `ct("2115990222")`
`chillingSlothPool`	`1992087837`	`ct("1992087837")`
`wakeScheduler`	`3516166472`	`ER(xHr)` → `ct("3516166472")` + platform
`computerUse`	`4116586025`	`LHr()` → `ct("4116586025")` + platform
`framebufferPreview`	`1928275548`	`GHr()` → same as chillingSlothFeat

Multiple features are hardcoded Md = {status: "supported"}: ccdPlugins, tearOffHalo, coworkArtifactPopout, claudeDesignWindow, coworkRemoteSessionSpaces, coworkBranchSession, bootstrapConfig, chatIn3p, builtinMcpPresets

Complete Analysis

CSV with 226 features, names, 1p/3p state, and compliance: ~/.bezetacil/workdir/claude-desktop/feature-flags.csv

References

claude-desktop-bundles — Bundle architecture (ASAR, Vite, remote vs local)
claude-desktop-analysis-workflow — Analysis tools (LSP, ast-grep, CDP)
claude-desktop-infra-stack — Proposed infrastructure stack
claude-desktop-voice-protocol — STT/TTS WebSocket protocol