Claude Reply Tokens

Claude Reply Tokens is a VS Code companion extension that shows the token usage for the latest Claude Code reply in the status bar.

It does not depend on private APIs from the official anthropic.claude-code extension. Instead, it reads Claude Code's local JSONL session logs and computes the latest full assistant reply chain for the current workspace.

Features

• Shows the latest Claude reply token usage in the VS Code status bar
• Aggregates a full reply chain instead of only the last assistant JSONL record
• Matches Claude sessions to the current workspace
• Refreshes automatically when Claude writes new transcript lines
• Opens a latest-turn analysis panel from the status bar
• Shows rolling cumulative usage for the current workspace (1h / 1d / 3d / 7d / 30d)
• Estimates API cost using auto-synced Anthropic pricing or manual overrides
• Keeps the matching transcript available as a separate command

How It Works

The extension scans Claude's local projects/**/*.jsonl files, finds the most relevant session for the current workspace, and reconstructs the latest full turn by walking parentUuid across assistant records and intermediate tool_result user records.

The total includes:

• input_tokens
• output_tokens
• cache_creation_input_tokens
• cache_read_input_tokens

Clicking the status bar opens a latest-turn analysis panel that shows:

• Exact token buckets for the turn (input / output / cache write / cache read)
• Rolling cumulative token usage for the current workspace (1h / 1d / 3d / 7d / 30d)
• A heuristic content mix by message-block category (user text / tool result / assistant tool use / assistant thinking / assistant text)
• Per-assistant-step totals so you can see which call in the turn was expensive

Claude's JSONL logs expose usage per assistant record, not per content block, so the content-category section is heuristic rather than exact token accounting.

Requirements

• VS Code 1.86.0 or later
• Claude Code installed and actively writing transcript files locally

Settings

This extension contributes the following settings:

• claudeReplyTokens.dataDirectory Override the Claude config directory. Point it at the folder that contains projects/.
• claudeReplyTokens.refreshIntervalSeconds Fallback full-rescan interval in seconds. Minimum: 30.
• claudeReplyTokens.pricingMode Cost pricing mode. auto syncs from Anthropic pricing pages and falls back to bundled defaults. manual uses your configured overrides.
• claudeReplyTokens.pricingAutoSyncIntervalHours Auto-sync interval for Anthropic pricing in hours. Minimum: 1.
• claudeReplyTokens.manualPricing Manual pricing overrides keyed by Claude model ID or alias. Values are USD per million tokens.

Example:

{
  "claudeReplyTokens.manualPricing": {
    "claude-sonnet-4-6": {
      "inputPerMillionUsd": 3,
      "outputPerMillionUsd": 15,
      "cacheWritePerMillionUsd": 3.75,
      "cacheReadPerMillionUsd": 0.3
    }
  }
}

Commands

• Claude Reply Tokens: Refresh
• Claude Reply Tokens: Open Latest Claude Turn Analysis
• Claude Reply Tokens: Sync Claude Pricing Now
• Claude Reply Tokens: Open Claude Transcript
• Claude Reply Tokens: Open Claude Reply Tokens Settings

Development

Recommended local toolchain:

• Node.js 20.x LTS
• VS Code 1.86.0 or later

If you use nvm, run:

nvm use

Install dependencies:

npm install

Compile:

npm run compile

Run tests:

npm test

Launch an Extension Development Host:

1. Open this project in VS Code
2. Press F5

Packaging

Create a VSIX package:

npm run package:vsix

This produces a file like:

claude-reply-tokens-0.3.0.vsix

Install locally:

code --install-extension ./claude-reply-tokens-0.3.0.vsix --force

Team Distribution

Recommended workflow:

1. Run npm run package:vsix
2. Upload the generated .vsix to your shared release location
3. Ask teammates to install it with code --install-extension ... --force

Notes

• This extension currently tracks the current workspace only
• It does not hook into the official Claude Code extension internals
• If multiple Claude sessions match the same workspace, it uses the one with the latest assistant activity
• Before publishing to VS Code Marketplace, replace YOUR_PUBLISHER_ID in package.json with your real publisher ID