opencode run --attach exits 0 after first tool-call step_finish, drops final text event (1.17.20 + 1.18.4) #38661

Description

opencode run --attach <url> --format json exits 0 after the first step_finish (reason: "tool-calls") and never emits the second step's text event — even though the server completes the full agentic loop.

Confirmed via server-side SQLite: the --attach session has all 9 parts stored (including the final text from step 2), but the CLI only output 4 events (step 1 only) before exiting.

This makes --attach unusable for any agent that uses tools.

Plugins

None

OpenCode version

1.17.20 (also reproduced on 1.18.4)

Steps to reproduce

1. Start a server with an agent that calls a tool first:

opencode serve --hostname 0.0.0.0 --port 4096

Agent (~/.config/opencode/agents/hello-world.md) — must call a tool then reply:

---
name: hello-world
mode: primary
model: zai-coding-plan/glm-5.2   # any OpenAI-compatible provider reproduces this
tools:
  mcp__my-mcp__get_info: true
---
First call `mcp__my-mcp__get_info`, then reply to the user. Two steps required.

2. Local opencode run works (full 2-step loop, 6 events):

opencode run --agent hello-world --format json --auto --pure "hi"
# → step_start, tool_use, step_finish(tool-calls), step_start, text, step_finish(stop) ✓

3. opencode run --attach is broken (1 step only, 4 events, no text):

opencode run --attach http://<server>:4096 --agent hello-world --format json --auto --pure "hi"
# → step_start, tool_use, step_finish(tool-calls), [exit 0] ✗

Reproduces on loopback (127.0.0.1:4096 from inside the same container) — not a networking issue.

Server-side proof (the key evidence)

After the --attach call above, querying the session in the server's SQLite DB (opencode.db) shows all 9 parts including the final text:

parts stored for attach session:
  [0] text      "hi"                    (user)
  [1] step-start                        (step 1)
  [2] reasoning
  [3] tool       my-mcp__get_info
  [4] step-finish
  [5] step-start                        (step 2 ← server started it)
  [6] reasoning
  [7] text      "Here is the info..."   ← final response EXISTS in DB
  [8] step-finish

The server completed step 2 and stored the text, but the CLI exited before consuming those events.

Session token counts confirm: output: 66 tokens (attach) vs output: 65 (local baseline) — the model generated similar output in both cases.

Suspected code location

packages/opencode/src/cli/cmd/run.ts, the event loop break condition (~line 789):

if (
  event.type === "session.status" &&
  event.properties.status.type === "idle"
) {
  break   // ← exits before step 2 events arrive
}

In --attach mode the server appears to emit session.status: idle between step 1 and step 2; the CLI treats it as turn-complete and exits. Local mode doesn't hit this (in-process event timing differs).

Operating System

Linux x86_64 (Docker containers, node:20-slim based)

Terminal

Non-interactive (--format json piped to stdout, no TTY)