opencode-auto-resume

Plugin for OpenCode that automatically detects and recovers from LLM session failures — stalls, broken tool calls, hallucination loops, stuck subagent parents, and more. Fully silent, zero UI pollution.

What it does

LLM sessions fail in predictable ways. This plugin monitors all sessions and automatically recovers without user intervention. Each recovery path below references the upstream OpenCode issues that motivated it — these are problems not yet resolved in the official project.

Stall recovery

The stream goes silent but the session stays "busy". The UI shows a blinking cursor with no progress. If no events arrive for 48 seconds (chunkTimeoutMs + gracePeriodMs), the plugin sends "continue" with exponential backoff. After 3 failed attempts it gives up.

The plugin extracts the agent, model, and provider from the last session message, so it resumes with the exact same configuration the user was using (build, sisyphus, prometheus, etc.).

Motivated by:

• #34214 — Opencode freezes / becomes unresponsive mid-session
• #35207 — Session hangs indefinitely after MCP tool-call — no timeout recovery (deadlock)
• #31655 — Window completely frozen/unresponsive after reopening a project with a stalled session
• #34460 — Thread freezes after switching to Go model — requires Escape key to unstick

Tool calls as raw text

The model prints tool invocations as raw XML/JSON (<function=edit>..., {"type":"function",...}) instead of executing them. The session goes idle normally but the tool was never run. On idle, the plugin fetches the last messages and scans for XML tool-call patterns — including truncated and alternative formats. If found, it sends TOOL_TEXT_RECOVERY_PROMPT to force a clean tool call.

Also detects tool calls trapped inside thinking/reasoning parts and emits THINKING_TOOL_RECOVERY_PROMPT to extract them.

Motivated by:

• #31247 — Copilot Claude Opus 4.8 emits pseudo tool-call text instead of structured tool calls
• #34126 — OpenAI Chat parser treats standalone text before tool_calls as assistant text
• #33959 — OpenCode Desktop does not execute valid OpenAI tool calls from qwen3-coder:30b (Ollama)
• #35689 — DeepSeek silently stops executing (interleaved reasoning_content dropped in tool call messages)

Hallucination loop

The model generates the same broken output repeatedly. Each continue just picks up the broken generation. If a session needs 3+ continues within 10 minutes, the plugin aborts the request and sends "continue" fresh, forcing a clean restart.

A separate tool-call loop detector also catches the model calling the same tool 3+ consecutive times (or repeating patterns of length 2-5 occurring at least three times). When detected, it emits TOOL_LOOP_RECOVERY_PROMPT to break the loop instead of blindly continuing.

Motivated by:

• #22142 — Repetitive tool-call loops with alibaba-coding-plan-cn/qwen3.6-plus
• #16218 — Model repeats the same response in a loop after generating an answer
• #33216 — OpenCode Repeatedly Ignores Instructions and Loops Responses
• #35784 — opencode-go/glm-5.2 + read file loop
• #25129 — Thinking mode gets stuck in infinite repetition loop

Orphan parent

A subagent finishes but the parent session stays stuck as "busy" forever. The plugin detects when busyCount drops from >1 to 1, waits 15 seconds (subagentWaitMs), then aborts and resumes the parent.

Motivated by:

• #35066 — notify parent when subagent sessions finish
• #33050 — orphaned sessions continue looping after abort, causing sustained high CPU
• #32335 — opencode run processes don't exit after completing scheduled work, causing memory leak

Subagent stuck detection

Detects when a subagent hasn't received new text for >1 minute (or >3 minutes if a tool call is in progress). If stuck, sends a recovery prompt to the subagent before triggering abort+resume on the parent. This avoids killing a parent that merely has a slow child.

Motivated by:

• #35073 — subagent permission asks hang indefinitely (sync subagents treated as interactive)
• #35806 — malformed tool-input stream ordering crashes Session drains
• #32580 — Agent showing repeated thinking

Active-tool safety guard

Before any abort, the plugin calls checkSessionHasActiveTool() to verify the session isn't mid-tool-execution. If a tool is running, the abort is skipped. This prevents the plugin from killing a long-running build, test suite, or command — even when it looks like a stall.

Motivated by:

• #26063 — Tool execution aborted/terminated
• #31459 — "Tool execution aborted" during Preparing write
• #5937 — (internal) must never abort a tool execution

Model, agent & provider preservation

When resuming with "continue", the plugin extracts agent, model, and provider from the last session message — falling back to msg.info.agent / msg.info.model if the top-level field is missing. This preserves the user's UI selection across resumes instead of reverting to the default agent.

Motivated by:

• #35126 — Subagents launched via task tool ignore their model: frontmatter and inherit parent agent's model
• #35899 — Web: switching sessions overwrites user-selected model with agent default
• #34562 — Model provider not restored correctly when switching projects

ESC cancel respected

User presses ESC to cancel a request. The plugin detects MessageAbortedError and marks all busy sessions as cancelled, never resuming them. The grace period (gracePeriodMs) also lets late ESC/status events arrive before any action.

Motivated by:

• #28453 — ACP session/cancel emits agent_error for MessageAbortedError before cancelled result
• #32432 — Cancelled subagents can't be opened in TUI + Ctrl+X intermittently fails
• #30144 — Early prompt cancel can poison directory instance

Explicit completion via task_complete

The agent can call the built-in task_complete tool to signal that all work is done. When invoked, the plugin stops sending any further "continue" prompts, clears all pending timers, and marks the session as complete. This replaces fragile text-based heuristics (emoji patterns, language detection) with a deterministic signal.

🎉 emoji completion

An assistant message ending with 🎉 resets the tool-text timer and prevents a trigger — the emoji signals the agent considers the task complete.

Ready-to-continue auto-resume

When the assistant prints phrases like "Ready to continue with task" or "Proceeding with task", the plugin automatically sends "continue" without waiting for the user. This catches the common pattern where the model stops to ask for permission it doesn't need.

Done-claim verification

If the assistant claims the task is done ("task done", "finished", "all complete") but open todos remain, the plugin sends DONE_WITHOUT_WORK_PROMPT asking the agent to verify and finish remaining work. This uses the real todo.updated event state — not regex on the message text.

False-positive protection during subagent work

Long tool execution or active subagents can look like a stall. Only the session emitting events gets its timer reset (not all sessions). When multiple sessions are busy, stall detection is paused entirely. The plugin also clears existing timers before creating a new setTimeout in idle handlers to prevent queued continue triggers.

Spurious error suppression

After normal completion, OpenCode sometimes fires a session.error. All logging goes through ctx.client.app.log() (zero console.log), and errors on already-idle sessions are silently ignored.

Motivated by:

• #33687 — Interrupted assistant messages retain non-error finish value (orphan tool-input-start abort)
• #28958 — Plugin hook rejection aborts unrelated parallel sessions
• #25899 — ACP prompt() returns stopReason: end_turn + zero usage on user cancel

Session discovery & cleanup

Periodically calls session.list() (every 60s) to pick up sessions that were missed by event tracking. Idle sessions are cleaned up after 10 minutes or when the idle map exceeds 50 entries, preventing memory leaks.

Motivated by:

• #35750 — Upgrade to 1.17.x hides pre-existing sessions — new path column not back-filled during migration
• #33102 — OpenCode Go workspace subscription is orphaned/hidden and cannot be managed from dashboard
• #27759 — Session heartbeat for multi-session liveness detection

Architecture

Any SSE Event
  ├─ has sessionID? → touchSession(sid) — reset only that session's timer
  └─ no sessionID → ignore

session.status events:
  ├─ busy → reset timer, clear retry counters
  └─ idle → schedule tool-text check (3s delay)
              └─ fetch messages → scan for XML / thinking-tool patterns
                  ├─ found → send recovery prompt (with backoff)
                  └─ not found → check ready-to-continue / done-claim patterns
              └─ orphan check: busyCount dropped from >1 to 1?
                  └─ subagentWaitMs watch → abort + continue

todo.updated events:
  └─ track real todo state (not regex on message text)

Timer loop (every 5s):
  for each busy session:
    ├─ orphan watch active? → wait or abort+continue
    ├─ busyCount > 1? → skip (subagent running)
    ├─ active tool running? → skip (never abort tools)
    └─ idle > 48s? → hallucination loop? abort : continue with backoff

Periodic (every 60s): session.list() to discover missed sessions
Periodic: cleanup idle sessions older than 10min or >50 entries

Installation

Via npm (recommended)

npm install opencode-auto-resume

Add to your opencode.jsonc:

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

With options:

{
  "plugin": [
    ["opencode-auto-resume", {
      "chunkTimeoutMs": 45000,
      "gracePeriodMs": 3000,
      "maxRetries": 3
    }]
  ]
}

Via GitHub (manual clone)

OpenCode may clone the repository to ~/.config/opencode/plugins/opencode-auto-resume/ automatically.

To update the plugin:

cd ~/.config/opencode/plugins/opencode-auto-resume
git pull
bun run build

Configuration

{
  "plugin": [
    [
      "file:///home/YOURUSER/.config/opencode/plugins/opencode-auto-resume/dist/index.js",
      { "chunkTimeoutMs": 45000, "maxRetries": 3 }
    ]
  ]
}

Configurable options

| Option | Default | Description | |---|---|---| | chunkTimeoutMs | 45000 | Inactivity timeout before considering stream stalled | | gracePeriodMs | 3000 | Extra wait before acting (lets ESC/status events arrive) | | checkIntervalMs | 5000 | Timer poll interval | | maxRetries | 3 | Max auto-resume attempts before giving up | | baseBackoffMs | 1000 | First retry delay (doubles each attempt) | | maxBackoffMs | 8000 | Backoff cap | | subagentWaitMs | 15000 | Wait before treating orphan parent as stuck | | loopMaxContinues | 3 | Continues in window before triggering abort | | loopWindowMs | 600000 | Hallucination loop detection window (10 min) |

Internal constants (not configurable)

| Constant | Value | Description | |---|---|---| | TOOL_TEXT_CHECK_DELAY_MS | 3000 | Delay before scanning idle session for tool-as-text | | ABORT_CONTINUE_DELAY_MS | 2000 | Delay between abort and continue | | MAX_IDLE_SESSIONS | 50 | Idle session map cap before cleanup | | IDLE_CLEANUP_MS | 600000 | Idle session age before cleanup (10 min) | | SESSION_DISCOVERY_INTERVAL_MS | 60000 | session.list() poll interval (60s) |

Verification

To verify the plugin is loaded, run /status inside OpenCode — it lists all loaded plugins and their versions. You should see opencode-auto-resume in the list.

The plugin handles all recovery automatically — no manual intervention needed.

Troubleshooting

| Problem | Solution | |---|---| | Resumes after ESC | Increase gracePeriodMs to 5000 | | Too aggressive | Increase chunkTimeoutMs to 60000 | | Too slow to react | Decrease checkIntervalMs to 2000 | | Orphan parent not detected | Increase subagentWaitMs to 20000 | | Hallucination loop not caught | Decrease loopMaxContinues to 2 | | Tool-text not detected | Check server logs — requires SDK message fetching | | Long-running tool killed | Should not happen — active-tool guard prevents it. Report a bug. |