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# OpenCode Runner
This runner integrates with the [OpenCode CLI](https://github.com/sst/opencode).
Shipped in Takopi v0.5.0.
## Installation
```bash
npm i -g opencode-ai@latest
```
## Configuration
Add to your `takopi.toml`:
=== "takopi config"
```sh
takopi config set opencode.model "claude-sonnet"
```
=== "toml"
```toml
[opencode]
model = "claude-sonnet" # optional
```
## Usage
```bash
takopi opencode
```
## Resume Format
Resume line format: `` `opencode --session ses_XXX` ``
The runner recognizes both `--session` and `-s` flags (with or without `run`).
Note: The resume line is meant to reopen the interactive TUI session. `opencode run` is headless and requires a message or command, so it is not the canonical resume command.
## JSON Event Format
OpenCode outputs JSON events with the following types:
| Event Type | Description |
|------------|-------------|
| `step_start` | Beginning of a processing step |
| `tool_use` | Tool invocation with input/output |
| `text` | Text output from the model |
| `step_finish` | End of a step (reason: "stop" or "tool-calls" when present) |
| `error` | Error event |
See [stream-json-cheatsheet.md](./stream-json-cheatsheet.md) for detailed event format documentation.