Herdr Opencode

Native Herdr lifecycle reporting for OpenCode v1 and v2 from one plugin.

Inside a Herdr pane, OpenCode's actual state (working / blocked / idle) and session identity are reported straight to the Herdr daemon over its socket — no screen scraping, no heuristic manifest matching. Herdr's agent panel shows the real state, and panes restore with opencode --session <id> after a server restart.

┌─ herdr ──────────────────────────────────────┐
│ pane: opencode        state: working ▮▮▮     │
│ pane: claude          state: blocked ⏸       │
└──────────────────────────────────────────────┘
        ▲ pane.report_agent / pane.report_agent_session
        │
   opencode v1 or v2, running this plugin

Why this exists

Herdr ships an OpenCode integration (herdr integration install opencode), but as of herdr 0.8.0 it has two problems this plugin fixes:

1. It does not load on modern OpenCode. The stock plugin uses a named export; OpenCode 1.18+ only invokes export default (herdr#2548).
2. It never reports state even when hand-patched, because root sessions were misclassified as child sessions and swallowed (herdr#2548, defect 2).
3. OpenCode 2 (opencode2) is not recognized at all — herdr's process detector looks for the opencode executable (discussion #1971).

This plugin speaks the same socket protocol, loads correctly on OpenCode ≥ 1.18.29 (v1) and on OpenCode 2 (opencode2), fixes the root/child classification, and adds nothing else — no dependencies, no hooks into your prompts.

Install

OpenCode v1

npm install -g @phux/herdr-opencode

// ~/.config/opencode/opencode.json
{
  "plugin": ["@phux/herdr-opencode"]
}

OpenCode 2 (opencode2)

npm install -g @phux/herdr-opencode

// ~/.config/opencode/opencode.json — v2 reads the same file family
{
  "plugins": ["@phux/herdr-opencode"]
}

Both hosts load the same entrypoint: v1 calls server(), v2 calls setup() (the dual shape from OpenCode's plugin docs).

Local file (no npm)

curl -fsSL https://raw.githubusercontent.com/no-phux/herdr-opencode/main/src/index.ts \
  -o ~/.config/opencode/plugins/herdr-opencode.ts

v1 discovers plugins/*.ts directly; v2 discovers direct files too (child directories as packages need a reasonably current v2 build — anomalyco/opencode#41530).

What it reports

OpenCode event	Herdr
session.created (root)	pane.report_agent_session with session_start_source: new
session.updated (changed root)	pane.report_agent_session
session.status → busy/running/streaming/…	state working
session.status → idle	state idle
session.status (unknown kind)	bare session re-report
tool.execute.*, permission.replied, session.compacted	state working
permission.asked, question.asked, session.error	state blocked
subagent/child sessions	dropped — child prompts project state without stealing the pane's root session

The wire protocol is Herdr's own: line-delimited JSON over HERDR_SOCKET_PATH (\\.\pipe\ on Windows), methods pane.report_agent and pane.report_agent_session, stamped with pane_id, source: herdr:opencode, agent: opencode, and a monotonic seq. One short-lived connection per report with a 500 ms timeout — a wedged daemon can never hang your session.

Notes for OpenCode 2 users

• OpenCode 2 installs as opencode2; Herdr's process detector currently keys on the opencode executable name. Until Herdr ships native v2 detection (discussion #1971), launch v2 through an alias so the pane is recognized:

  target="$(readlink -f "$(command -v opencode2)")"
  mkdir -p ~/.local/opt/opencode2-herdr
  ln -sfn "$target" ~/.local/opt/opencode2-herdr/opencode
  # launch ~/.local/opt/opencode2-herdr/opencode
  

• This plugin reports agent: opencode either way — that is the agent type Herdr's manifest already understands, and the v2 progress bar maps to working under Herdr's screen fallback while the pane is undetected.

Debugging

HERDR_OPENCODE_DEBUG=1 opencode   # reports to stderr as [herdr-opencode]
herdr agent list                  # agent_session should now be populated

If state never updates: check HERDR_ENV, HERDR_SOCKET_PATH, and HERDR_PANE_ID are set in the pane (they are injected by Herdr itself), and that the plugin is listed as loaded (/plugins in v2, or opencode's startup logs in v1).

Compared to herdr integration install opencode

	stock integration	herdr-opencode
OpenCode v1 ≥ 1.18.29	✗ (never loads)	✓
OpenCode v1 older	✓ (named export)	✓
OpenCode v2 (opencode2)	✗	✓
root/child classification	✗ (swallows all events)	✓ fixed
session restore	✗ (no session reported)	✓
dependencies	none	none

Keep the stock integration uninstalled while using this one — two reporters would interleave conflicting seq streams on the same pane.

Development

npm ci
npm test        # typecheck + build + node:test (classifier + real socket round-trip)

The classifier and wire protocol are pure and table-tested; the socket test stands up a real Unix socket server and asserts the exact JSON lines and their ordering.

License

MIT — published by no-phux for the Herdr community.