opencode-codex-meter

An OpenCode plugin that reports Codex subscription quota and per-session token usage — without spending a model turn.

What it does

• Sidebar panel — a persistent panel in OpenCode's sidebar showing live quota bars (5h and weekly windows) and per-model token usage, updating in real time as tokens stream.

  ┌─ Codex Meter ────────────────────────────────┐
  │ 5h quota      [████████░░░░░░░░░░░░] 37%      │
  │ Weekly quota  [████████████░░░░░░░░] 62%      │
  │                                               │
  │ openai/gpt-5.5  (5 msgs)                      │
  │   Input        184,230                        │
  │   Output         8,491                        │
  │   Reasoning     21,048                        │
  │   Cache read   421,120                        │
  │   Cache write       0                         │
  │   Total        634,889                        │
  └───────────────────────────────────────────────┘
  

• codex_usage tool — ask the agent to call it for a detailed report covering both quota and per-session token totals.

• codex-meter CLI — print a report from your shell:

  codex-meter --session <session-id>        # human-readable
  codex-meter --session <session-id> --json # JSON output
  codex-meter --quota-only                  # quota only, no session needed

Quota data comes from the ChatGPT backend and may be unavailable (the plugin keeps working with token totals only). Token totals are always available.

Install

opencode plugin opencode-codex-meter --global

That's it. This one command installs the package and configures both the server tool and the TUI sidebar — no manual config editing required.

Manual install (alternative): if you prefer to edit config files by hand, the plugin must be registered in both config files because OpenCode keeps server and TUI plugins separate:

// ~/.config/opencode/opencode.json
{ "plugin": ["opencode-codex-meter"] }

// ~/.config/opencode/tui.json
{ "plugin": ["opencode-codex-meter"] }

Then run npm install opencode-codex-meter in ~/.config/opencode/. Using opencode plugin ... --global is strongly recommended instead.

Run

1. Start OpenCode in a project:

   opencode

2. Authenticate with your ChatGPT/Codex account (only needed once for quota data; token totals work without auth):

   opencode auth login -p openai

3. Start a session and send a message. The sidebar panel appears automatically and updates as the session progresses.

To get a report on demand, ask the agent: "Call the codex_usage tool." Or from a shell:

codex-meter --session <session-id>

Configuration

All settings are optional environment variables:

Variable	Default	Purpose
CODEX_METER_ENABLED	true	Disable all plugin behavior.
CODEX_METER_AUTH_PATH	unset	Explicit auth.json path.
CODEX_METER_QUOTA_TTL_MS	90000	Quota cache lifetime (ms).
CODEX_METER_QUOTA_TIMEOUT_MS	5000	Network request timeout (ms).
CODEX_METER_WARNING_PERCENT	80	Warning threshold.
CODEX_METER_DEBUG	false	Sanitized debug logging.

Troubleshooting

• No quota data — run opencode auth login -p openai. The plugin never refreshes tokens; restart OpenCode after re-authenticating. The wham endpoint is undocumented and may occasionally fail; token totals keep working.
• Sidebar not appearing — ensure the plugin is installed via opencode plugin opencode-codex-meter --global (writes both opencode.json and tui.json). Restart OpenCode. Open a session and send at least one message.
• CLI cannot connect — ensure the OpenCode server is running (opencode serve) or pass --server-url http://127.0.0.1:4096.

Privacy

• Reads only the OpenAI OAuth access token, expires, and accountId from ~/.local/share/opencode/auth.json.
• Never reads, stores, or logs the refresh token.
• Never writes to auth.json or refreshes OAuth credentials.
• The only network destination is https://chatgpt.com/backend-api/wham/usage.

See SECURITY.md for the full security policy.

License

MIT