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compare: fix/opencode-plugin-compact-loses-agent
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Commits on May 7, 2026

  1. fix: restore correct agent context after implicit compaction in proce… 

    …ed_to_phase

## High level changes

- `plugin.ts`: Added `lastKnownAgent` variable that caches the last enabled agent name seen in `chat.message`
- `plugin.ts`: Post-compaction `promptAsync` now passes `agent: lastKnownAgent` in the request body so the continue message runs under the original workflow agent
- `plugin.ts`: Added `postCompactionAutoResume` flag set on `session.compacted` to bypass the agent filter for OpenCode's own auto-continue message
- `plugin.ts`: `chat.message` hook checks `bypassAgentFilter` before the `isAgentEnabled` guard so phase instructions are injected instead of a suppression/no-workflow notice

## Motivation

After `proceed_to_phase` triggers implicit compaction, OpenCode resumes the session using its default agent (e.g. `build`) rather than the original workflow agent. This caused two problems:
1. OpenCode's built-in auto-continue `chat.message` arrived with agent `build`, hit the `WORKFLOW_AGENTS` filter, and injected "No Active Workflow Detected" instead of phase instructions.
2. The plugin's own follow-up `promptAsync` (sent on `session.idle`) also omitted the agent field, so it too ran under the wrong agent, losing system prompt and tool access.

## Details

- `lastKnownAgent` is only updated when `isAgentEnabled` is true, ensuring a subagent name (e.g. `general`, `explore`) never overwrites the cached workflow agent.
- `postCompactionAutoResume` is set to `true` on `session.compacted` and consumed (set back to `false`) by the very next `chat.message` invocation. This is a one-shot bypass: it covers exactly OpenCode's implicit auto-continue turn and nothing more.
- The `promptAsync` body now spreads `{ agent: lastKnownAgent }` when a cached agent is available. `PromptInput.agent` is an optional string field in the OpenCode API, so this is a safe additive change with no effect when `lastKnownAgent` is `null`.
    @mrsimpson
    mrsimpson committed May 7, 2026
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