OpenCode will be supported starting from next update! A few notes on the implementation

[jsgrrchg]

OpenCode support will be merged soon and is expected to be available in the next NeverWrite update.

A few notes about the implementation and its current scope:

What will work

OpenCode is being added to NeverWrite as a native ACP runtime. This means users will be able to configure and use opencode acp directly from the app, alongside the existing runtimes.

The integration includes:

• OpenCode runtime discovery and setup.
• OpenCode authentication flow support.
• Model, mode, and config handling through ACP.
• Chat sessions, streaming, tool calls, permissions, file reads/writes, terminal tools, and review diffs.
• Inline review support for OpenCode edits, including fixes for the diff reconstruction issues found during testing.

One important detail: connecting a new ACP runtime to NeverWrite’s review layer is not plug-and-play. Each provider implements diff streaming differently, so every runtime needs provider-specific handling.

Important note about subagents

OpenCode itself supports subagents, but exposing them in NeverWrite the same way Codex subagents work is a separate problem.

Codex currently works because the bundled Codex ACP bridge emits extra metadata and events for child sessions. NeverWrite uses those events to create real child tabs, link them to the parent conversation, and stream subagent activity into separate sessions.

This is a capability unique to NeverWrite, and it was implemented specifically to prevent silent writes.

OpenCode has real child sessions internally, but its current ACP bridge does not appear to expose those child sessions as independent ACP sessions in the same way. Because of that, NeverWrite can likely support a limited MVP later, where OpenCode subagent results are detected after a task completes and then shown as child sessions.

However, full live support — with streaming child sessions like Codex — would likely require changes upstream in OpenCode’s ACP bridge.

Relevant OpenCode repo:

https://github.com/anomalyco/opencode

Likely relevant files:

• packages/opencode/src/acp/agent.ts
• packages/opencode/src/acp/session.ts
• packages/opencode/src/tool/task.ts

Current plan

For this release, the goal is to merge stable OpenCode ACP support first.

If you rely on NeverWrite’s review layer, please do not use subagents with OpenCode yet.

OpenCode subagent support will be tracked separately. I plan to submit a PR to the OpenCode repo for this, and I’ve already tried contacting the author, but there is no guarantee of a response or upstream acceptance.

Another possible solution would be to bundle a custom OpenCode runtime with NeverWrite. However, I’d prefer to avoid that for now, since NeverWrite’s binary size is already large enough.

The safest path is:

1. First, validate OpenCode ACP traces from real usage.
2. Add a limited NeverWrite-side MVP if the metadata is stable enough.
3. Work with OpenCode upstream, or patch OpenCode’s ACP bridge, if we want full live child-session support.

So, in short: OpenCode support is coming soon. OpenCode subagents are feasible, but full native subagent support is not part of this first merge.