opencode-rtk-plugin

An OpenCode v2 plugin that routes every shell command through rtk, cutting LLM token usage by 60-90% on common dev commands.

OpenCode sends tool output back to the model. rtk compresses that output (git, grep, ls, test runners, build logs, and more) into a token-efficient form before the model ever sees it. This plugin wires the two together.

Why

• Smaller context, lower cost. Command output is the biggest hidden token sink in an agent loop.
• No prompt changes. Rewriting happens in the shell hook, transparently.
• Single source of truth. All rewrite rules live in rtk rewrite; this plugin is a thin delegating adapter, so rules never drift.

Requirements

• OpenCode v2 (opencode --version reports 2.x).
• rtk >= 0.23.0 on PATH — see rtk-ai/rtk: brew install rtk

Install

From npm

opencode plugin add opencode-rtk-plugin

From GitHub

opencode plugin add github:nabheet/opencode-rtk-plugin

Or add it to opencode.json(c) directly:

{
  "$schema": "https://opencode.ai/config.json",
  "plugins": ["opencode-rtk-plugin"]
}

Manual

Copy this directory to .opencode/plugins/opencode-rtk-plugin/ (project) or ~/.config/opencode/plugins/opencode-rtk-plugin/ (global), then list it:

{
  "plugins": [{ "package": "./.opencode/plugins/opencode-rtk-plugin" }]
}

Options

{
  "plugins": [
    {
      "package": "opencode-rtk-plugin",
      "options": {
        "binary": "rtk",
        "timeoutMs": 5000,
        "enabled": true
      }
    }
  ]
}

Option	Default	Description
binary	"rtk"	Path or name of the rtk executable.
timeoutMs	5000	Per-rewrite timeout in milliseconds.
enabled	true	Set false to disable the plugin.

How it works

The plugin registers one OpenCode v2 shell hook:

ctx.shell.hook("create.before", (event) => {
  // event.command is the command about to run; mutate it to rewrite
})

For each shell command it runs rtk rewrite <command> and replaces the command with rtk's output when it differs. If rtk is missing, times out, or errors, the original command runs unchanged.

Compatibility

• Targets OpenCode v2 (plugins config + id/setup plugin definition). OpenCode v1 used a different plugin API and is not supported.
• rtk ships hooks for Claude Code, Codex, Cursor, Gemini CLI, Copilot and others. OpenCode is not among them, so this plugin fills that gap.

Prereleases

Every push to a PR publishes an installable beta to the npm beta dist-tag:

opencode plugin add opencode-rtk-plugin@beta

Releases (maintainers)

All publishing happens in GitHub Actions via npm trusted publishing (OIDC provenance). Never publish from a local shell.

.github/workflows/ci.yml is the single workflow file (npm allows one trusted publisher per package; the workflow filename must stay ci.yml):

• test — lint + plugin-export smoke check on main and PRs (Node 24).
• push to main → publish job publishes the next patch to latest, pushes a vX.Y.Z tag, and opens a GitHub release. The version is derived from the last published latest, so repeated merges never collide; an intentional minor/major bump in package.json is honored.
• tag v*-beta* → publish job publishes beta + a prerelease GitHub release.
• every PR push → prerelease job publishes <version>-beta.<run_number> to beta (same-repo, non-draft, non-dependabot PRs; re-runs deduped).
• manual dispatch → next -beta.X staging publish from main, no git change.

License

MIT — see LICENSE. rtk itself is Apache-2.0 and is not bundled or vendored here.