Added support for the JetBrains AI Assistant

README.md

@@ -30,6 +30,7 @@ OpenUsage lives in your menu bar and shows you how much of your AI coding subscr
 - [**Cursor**](docs/providers/cursor.md) / credits, total usage, auto usage, API usage, on-demand, CLI auth
 - [**Factory / Droid**](docs/providers/factory.md) / standard, premium tokens
 - [**Gemini**](docs/providers/gemini.md) / pro, flash, workspace/free/paid tier
+- [**JetBrains AI Assistant**](docs/providers/jetbrains-ai-assistant.md) / quota, remaining
 - [**Kimi Code**](docs/providers/kimi.md) / session, weekly
 - [**MiniMax**](docs/providers/minimax.md) / coding plan session
 - [**Windsurf**](docs/providers/windsurf.md) / prompt credits, flex credits

docs/plugins/api.md

@@ -58,6 +58,7 @@ ctx.host.log.error("API request failed: " + error.message)
 host.fs.exists(path: string): boolean
 host.fs.readText(path: string): string   // Throws on error
 host.fs.writeText(path: string, content: string): void  // Throws on error
+host.fs.listDir(path: string): string[]  // Throws if directory cannot be opened; per-entry errors are silently skipped
 ```
 
 ### Path Expansion
@@ -79,6 +80,19 @@ try {
 }
 ```
 
+### Directory Listing
+
+Use `listDir` to inspect immediate child names under a directory:
+
+```javascript
+let entries = []
+try {
+  entries = ctx.host.fs.listDir("~/Library/Application Support/JetBrains")
+} catch {
+  entries = []
+}
+```
+
 **Example: Persisting plugin state**
 
 ```javascript

docs/providers/jetbrains-ai-assistant.md

@@ -0,0 +1,46 @@
+# JetBrains AI Assistant
+
+Tracks JetBrains AI Assistant quota from the local IDE quota cache.
+
+## Data Source
+
+The plugin reads `AIAssistantQuotaManager2.xml` from JetBrains IDE config directories.
+
+### Candidate base directories
+
+- macOS: `~/Library/Application Support/JetBrains`
+- Linux: `~/.config/JetBrains`
+- Windows: `~/AppData/Roaming/JetBrains`
+
+For each base directory, the plugin lists real IDE directories on disk (WebStorm, IntelliJ IDEA, PyCharm, etc.), then picks the valid entry with the latest quota window.
+
+## Parsed Fields
+
+From `quotaInfo`:
+- `current` -> used quota
+- `maximum` -> quota limit
+- `available` -> remaining quota
+- `until` -> next reset timestamp
+
+From `nextRefill`:
+- `tariff.duration` -> period duration when present (for pacing in UI)
+- `next` -> primary renewal/reset timestamp used in OpenUsage
+
+From nested quota buckets:
+- `tariffQuota.available` + `topUpQuota.available` are used as remaining when top-level `available` is missing.
+- Large raw values are normalized to credits for display (JetBrains stores quota in finer-grained internal units).
+
+## Displayed Lines
+
+| Line      | Scope    | Description |
+|-----------|----------|-------------|
+| Quota     | Overview | Used percentage |
+| Used      | Detail   | Used quota amount |
+| Remaining | Detail   | Remaining quota |
+
+## Errors
+
+| Condition | Message |
+|-----------|---------|
+| No valid quota file found | "JetBrains AI Assistant not detected. Open a JetBrains IDE with AI Assistant enabled." |
+| Quota file present but invalid | "JetBrains AI Assistant quota data unavailable. Open AI Assistant once and try again." |