OpenCode

Status: adapter written and unit-tested against OpenCode’s plugin API; not yet verified in a live session. Claude Code comes first; OpenCode follows Codex and Grok Build.

Install

Add DD to the project’s opencode.json:

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

OpenCode runs plugins in Bun, which has no node:sqlite, so the adapter imports nothing from DD: it runs DD’s hooks in Node, which must be 22.16 or later on the PATH.

How DD reaches the agent on OpenCode

OpenCode has no hook that adds context before a tool runs, and text added to the system prompt changes it on every delivery, which invalidates the prompt cache. DD therefore appends the memories that fire at a tool call to that call’s result, framed as advisory project knowledge, once per session. The system prompt is left alone.

What OpenCode does not get: a memory arrives with the result of the call it applies to, not before it (a read is unaffected; an edit learns of its trap one step late), and there is no Stop hook, so DD does not ask the agent to save knowledge at the end of a turn and turn checks do not run. The agent can still save knowledge when asked.