OpenViking OpenCode Plugin

A unified OpenCode plugin for OpenViking repository retrieval and long-term memory.

This is the only OpenCode plugin example maintained in this repository. It supersedes the former split examples for indexed repository prompt injection and long-term memory.

The plugin uses OpenCode hooks for lifecycle behavior and registers OpenViking's standard stdio MCP proxy for model tools. It does not install or require an OpenCode skill, and agents do not need to run ov shell commands.

What It Does

• Injects indexed viking://resources/ repositories into the system prompt.
• Exposes the same OpenViking MCP tools used by the Claude Code and Codex memory plugins.
• Maps each OpenCode session to an OpenViking session.
• Captures user and assistant text messages into OpenViking.
• Commits sessions at lifecycle boundaries for memory extraction.
• Automatically recalls relevant memories and injects them as hidden synthetic context for the current user message.
• Blocks accidental local filesystem reads of viking:// URIs and points the agent back to openviking_read, openviking_glob, or openviking_search.

Files

examples/opencode-plugin/
├── index.mjs
├── package.json
├── README.md
├── INSTALL-ZH.md
├── lib/
│   ├── config.mjs
│   ├── mcp-config.mjs
│   ├── runtime.mjs
│   ├── repo-context.mjs
│   ├── memory-session.mjs
│   ├── memory-recall.mjs
│   ├── session-inject.mjs
│   ├── viking-uri-guard.mjs
│   └── utils.mjs
├── servers/
│   └── mcp-proxy.mjs
├── tests/
└── wrappers/
    └── openviking.js

There is intentionally no skills/openviking/SKILL.md. The tool surface comes from OpenViking's MCP endpoint.

Requirements

• OpenCode
• OpenViking HTTP server
• Node.js 18+
• An OpenViking API key if your server requires authentication

Start OpenViking first:

openviking-server --config ~/.openviking/ov.conf

Installation

Published Package

Normal users should enable it through OpenCode's package plugin mechanism:

The published npm package is @openviking/opencode-plugin; verify availability with:

npm view @openviking/opencode-plugin version

{
  "plugin": ["@openviking/opencode-plugin"]
}

Source Install

For development or PR testing, copy the package into OpenCode's plugin directory with a top-level wrapper:

mkdir -p ~/.config/opencode/plugins/openviking
cp examples/opencode-plugin/wrappers/openviking.js ~/.config/opencode/plugins/openviking.js
cp examples/opencode-plugin/index.mjs examples/opencode-plugin/package.json ~/.config/opencode/plugins/openviking/
cp -r examples/opencode-plugin/lib ~/.config/opencode/plugins/openviking/
cp -r examples/opencode-plugin/servers ~/.config/opencode/plugins/openviking/

This creates a stable OpenCode plugin layout:

~/.config/opencode/plugins/
├── openviking.js
└── openviking/
    ├── index.mjs
    ├── package.json
    ├── lib/
    └── servers/

The top-level openviking.js is only a wrapper:

export { OpenVikingPlugin, default } from "./openviking/index.mjs"

This wrapper is only for source installs with the directory layout shown above. npm package installs load index.mjs directly through package.json. Use the .js wrapper for source installs; OpenCode's local plugin scanner discovers JavaScript/TypeScript plugin files.

Configuration

Create ~/.config/opencode/openviking-config.json:

{
  "enabled": true,
  "timeoutMs": 30000,
  "repoContext": { "enabled": true, "cacheTtlMs": 60000 },
  "autoRecall": {
    "enabled": true,
    "limit": 6,
    "scoreThreshold": 0.35,
    "maxContentChars": 500,
    "preferAbstract": true,
    "tokenBudget": 2000,
    "minQueryLength": 3
  },
  "commitTokenThreshold": 20000,
  "commitKeepRecentCount": 10,
  "profileTokenBudget": 10000,
  "resumeContextBudget": 32000
}

API keys are resolved from environment variables or ~/.openviking/ovcli.conf and sent as Authorization: Bearer ... by both hooks and the MCP proxy. account and user are trusted-mode identity headers sent as X-OpenViking-Account and X-OpenViking-User; leave them empty when using API-key mode with user/admin API keys. By default the plugin derives a peer from the project directory using Claude's project-directory naming rule: every non-letter-or-digit character becomes -, with no path normalization. For example, /Users/x/Dev/OpenViking becomes -Users-x-Dev-OpenViking. Data-plane memory/resource requests send the effective peer as X-OpenViking-Actor-Peer; captured session messages store it as body peer_id. Configure peerId or OPENVIKING_PEER_ID to override the workspace-derived peer, or set workspacePeer=false / OPENVIKING_WORKSPACE_PEER=0 to turn workspace-derived peers off.

Recall defaults to the broad mode: global memory, the current workspace, and other workspace memories can all be recalled, with other workspaces penalized and rendered later. Set recallPeerScope="actor" or OPENVIKING_RECALL_PEER_SCOPE=actor for the isolation mode, which only sees global memory plus the current workspace. In deployments where one bot serves multiple real people, such as zouk, vikingbot, or AstrBot, use the isolation mode with an explicit actor peer so one person's memories are not recalled into another person's session.

OPENVIKING_API_KEY, OPENVIKING_ACCOUNT, OPENVIKING_USER, and OPENVIKING_PEER_ID take precedence over values in this file.

For advanced setups, OPENVIKING_PLUGIN_CONFIG can point to another config file path.

OpenCode's local read, glob, and grep tools cannot read viking:// URIs. When the agent accidentally tries that, the plugin blocks the filesystem tool call and points it to the OpenViking MCP tools.

MCP Tools

OpenCode sees the OpenViking MCP server as openviking, so tool names are namespaced with openviking_.

• openviking_recall: balanced current-task recall using OpenViking's /recall endpoint.
• openviking_search: deep semantic retrieval across memories, resources, and skills.
• openviking_find: fast semantic retrieval.
• openviking_remember: store important facts or decisions for memory extraction.
• openviking_read: read one or more viking:// files.
• openviking_list: list a viking:// directory.
• openviking_grep: exact text or regex search.
• openviking_glob: glob file matching.
• openviking_add_resource: add a URL, local file, sitemap, or feed.
• openviking_forget: delete a viking:// URI after explicit user confirmation.
• openviking_list_watches / openviking_cancel_watch: inspect or cancel resource watches.
• openviking_code_search, openviking_code_outline, openviking_code_expand: inspect indexed code symbols.
• openviking_health: check OpenViking server health.

The proxy forwards the server's real tools/list response; the plugin does not maintain a separate native tool list.

Runtime Files

The plugin writes runtime files to ~/.config/opencode/openviking/ by default:

• openviking-memory.log
• openviking-session-state.json

Set runtime.dataDir in config to override this directory.