backnotprop__plannotator/apps/opencode-plugin

@plannotator/opencode

Annotate plans. Not in the terminal.

Interactive Plan Review for OpenCode. Select the exact parts of the plan you want to change—mark for deletion, add a comment, or suggest a replacement. Feedback flows back to your agent automatically.

Obsidian users can auto-save approved plans to Obsidian as well. See details

Watch Demo

Install

OpenCode 2 beta

Install OpenCode 2 from npm's next tag, then add Plannotator to the V2 plugins field:

{
  "$schema": "https://opencode.ai/config.json",
  "plugins": [
    {
      "package": "@plannotator/opencode@latest",
      "options": {
        "workflow": "plan-agent",
        "planningAgents": ["plan"]
      }
    }
  ]
}

Restart OpenCode 2 and verify that plannotator appears in opencode2 plugin list.

OpenCode 2 support is experimental while its plugin API is in beta. The core submit_plan review flow works everywhere. Two newer capabilities depend on which plugin API your OpenCode build ships with, and Plannotator detects both at runtime rather than requiring a particular channel:

• Slash commands. Native command execution landed upstream in @opencode-ai/plugin (anomalyco/opencode issue #2185, PR #44765) and currently ships on the beta and dev dist-tags; the next and latest tags still carry the older API. Capability is detected from the command draft OpenCode hands the plugin, not from the plugin API's shape: ctx.command.transform exists on both generations, and only the newer draft has add. On a host that has it, Plannotator registers /plannotator-review, /plannotator-annotate, and /plannotator-last itself and runs the same machinery OpenCode 1 uses, so your raw arguments reach the CLI unchanged and nothing is routed through the model. On an older host it registers nothing and the commands run from their markdown definitions, which ask the agent to run the plannotator CLI and relay its output; that path works but costs a model turn and depends on the agent following the instruction.
• Command precedence. OpenCode activates its own config-command loader after package plugins, and the last definition to claim a name wins, so the markdown stubs the installer writes to ~/.config/opencode/commands would otherwise shadow the native definitions on every normal install. Plannotator re-registers the three names shortly after startup so its own definitions are the ones that run. If that reclaim cannot run, the stubs keep the names and the commands still work through the model-mediated fallback.
• Agent switching. ctx.session.switchAgent arrived with the same plugin API generation. On a host that exposes it, an agent switch chosen in the review UI is applied to the session. On an older host the plan is still approved and a warning is written to the server log; switch to build manually before implementation.
• Abort signal. V2 tool execution still exposes no abort signal. Cancelling a turn cannot stop a running review server or CLI child immediately.
• TUI toasts. OpenCode 2 has a TUI plugin entry point, but it is separate from the server plugin Plannotator registers, so session URLs are written to the server output rather than shown as a toast. Remote sessions should read the URL from the OpenCode log.

OpenCode 1

Add to your opencode.json:

{
  "$schema": "https://opencode.ai/config.json",
  "plugin": ["@plannotator/opencode@latest"]
}

Restart OpenCode. By default, the submit_plan tool is available to OpenCode's plan agent, not to build or other primary agents.

OpenCode 1 slash commands: Run the install script to get /plannotator-review, /plannotator-annotate, and /plannotator-last:

curl -fsSL https://plannotator.ai/install.sh | bash

This also clears any cached plugin versions.

Workflow Modes

The examples below use the OpenCode 1 config shape. OpenCode 2 places the same option keys under the plugin entry's options object shown above. In V2, manual registers no tool, so it leaves only the slash commands: useful on a host with native command execution, inactive on one without it.

• plan-agent (default): submit_plan is available to OpenCode's built-in plan agent plus any extra agents listed in planningAgents. This keeps Plannotator integrated with OpenCode plan mode without nudging build to call it.
• manual: submit_plan is not registered. Use /plannotator-last, /plannotator-annotate, and /plannotator-review when you want Plannotator.
• user-managed: submit_plan is registered but no prompts or agent permissions are modified. You manage which agents can call submit_plan via OpenCode's native agent configuration.
• all-agents: legacy broad behavior. Primary agents can see and call submit_plan.

Default config:

{
  "$schema": "https://opencode.ai/config.json",
  "plugin": [
    ["@plannotator/opencode@latest", {
      "workflow": "plan-agent",
      "planningAgents": ["plan"]
    }]
  ]
}

Runtime selection is automatic. In Bun-hosted OpenCode, Plannotator uses the embedded server bundled with the plugin. In Node-hosted or wrapped OpenCode environments, the plugin falls back to the installed plannotator CLI and sends the result back through OpenCode. You can force the fallback while debugging:

{
  "$schema": "https://opencode.ai/config.json",
  "plugin": [
    ["@plannotator/opencode@latest", {
      "runtime": "cli"
    }]
  ]
}

If you use other OpenCode plugins, keep everything in one plugin array and attach Plannotator's options directly to the Plannotator entry:

{
  "$schema": "https://opencode.ai/config.json",
  "plugin": [
    ["@plannotator/opencode@latest", {
      "workflow": "plan-agent",
      "planningAgents": ["plan", "sisyphus"]
    }],
    "@tarquinen/opencode-dcp@latest",
    "octto",
    "oh-my-opencode-slim"
  ]
}

Do not put { "workflow": "plan-agent" } as its own item in the plugin array. OpenCode plugin entries must be either a plugin string or a two-item array like [pluginName, options].

Restore the old broad behavior:

{
  "$schema": "https://opencode.ai/config.json",
  "plugin": [
    ["@plannotator/opencode@latest", {
      "workflow": "all-agents"
    }]
  ]
}

Use commands only:

{
  "$schema": "https://opencode.ai/config.json",
  "plugin": [
    ["@plannotator/opencode@latest", {
      "workflow": "manual"
    }]
  ]
}

Register the tool but manage prompts and permissions yourself:

{
  "$schema": "https://opencode.ai/config.json",
  "plugin": [
    ["@plannotator/opencode@latest", {
      "workflow": "user-managed"
    }]
  ]
}

How It Works

1. The configured planning agent calls submit_plan → Plannotator opens in your browser
2. Select text → annotate (delete, replace, comment)
3. Approve → Agent proceeds with implementation
4. Request changes → Annotations sent back as structured feedback

Features

• Visual annotations: Select text, choose an action, see feedback in the sidebar
• Local by default: Plans, annotations, drafts, history, and configuration stay local. Every app load checks GitHub for updates without sending plan content, and there is currently no opt-out setting; URL annotation, hosted PR review, AI, sharing, and Workspaces use the network when selected.
• Legacy link sharing: Small markdown shares use compressed, unencrypted URL fragments. Larger and raw HTML shares can use client-encrypted short links. Workspaces is the primary direction for team sharing.
• Plan Diff: See what changed when the agent revises a plan after feedback
• Annotate last message: Run /plannotator-last to annotate the agent's most recent response
• Annotate files, folders, and URLs: Run /plannotator-annotate when you want manual review of an artifact
• Obsidian integration: Auto-save approved plans to your vault with frontmatter and tags

Environment Variables

Variable	Description
PLANNOTATOR_REMOTE	Set to 1 / true for remote mode, 0 / false for local mode, or leave unset for SSH auto-detection. Uses a fixed port in remote mode; browser-opening behavior depends on the environment.
PLANNOTATOR_PORT	Fixed port to use. Default: random locally, 19432 for remote sessions.
PLANNOTATOR_BROWSER	Custom browser to open plans in. macOS: app name or path. Linux/Windows: executable path.
PLANNOTATOR_SHARE_URL	Custom share portal URL for self-hosting. Default: https://share.plannotator.ai.
PLANNOTATOR_PASTE_URL	Custom paste service URL for self-hosting. Default: https://plannotator-paste.plannotator.workers.dev.
PLANNOTATOR_PLAN_TIMEOUT_SECONDS	Timeout for submit_plan review wait. Default: 345600 (96h). Set 0 to disable timeout.
PLANNOTATOR_BIN	Override the CLI path used by the OpenCode plugin's CLI runtime fallback. Default: plannotator on PATH.

Devcontainer / Docker

Works in containerized environments. Set the env vars and forward the port:

{
  "containerEnv": {
    "PLANNOTATOR_REMOTE": "1",
    "PLANNOTATOR_PORT": "9999"
  },
  "forwardPorts": [9999]
}

If nothing opens automatically, open http://localhost:9999 when submit_plan is called.

See devcontainer.md for full setup details.

Obsidian Integration

Save approved plans directly to your Obsidian vault.

1. Open Settings in Plannotator UI
2. Enable "Obsidian Integration" and select your vault
3. Approved plans save automatically with:
   • Human-readable filenames: Title - Jan 2, 2026 2-30pm.md
   • YAML frontmatter (created, source, tags)
   • Auto-extracted tags from plan title and code languages
   • Backlink to [[Plannotator Plans]] for graph view

Links

• Website
• GitHub
• Claude Code Plugin

License

Copyright 2025 backnotprop Licensed under MIT or Apache-2.0.