feat: opencode runner (#22)
Co-authored-by: banteg <4562643+banteg@users.noreply.github.com>
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Sebastian N. Fernandez
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# OpenCode Runner
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This runner integrates with the [OpenCode CLI](https://github.com/sst/opencode).
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## Installation
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```bash
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npm i -g opencode-ai@latest
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```
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## Configuration
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Add to your `takopi.toml`:
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```toml
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[opencode]
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model = "claude-sonnet" # optional
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```
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## Usage
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```bash
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takopi opencode
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```
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## Resume Format
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Resume line format: `` `opencode --session ses_XXX` ``
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The runner recognizes both `--session` and `-s` flags (with or without `run`).
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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.
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## JSON Event Format
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OpenCode outputs JSON events with the following types:
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| Event Type | Description |
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|------------|-------------|
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| `step_start` | Beginning of a processing step |
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| `tool_use` | Tool invocation with input/output |
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| `text` | Text output from the model |
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| `step_finish` | End of a step (reason: "stop" or "tool-calls" when present) |
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| `error` | Error event |
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See [opencode-stream-json-cheatsheet.md](./opencode-stream-json-cheatsheet.md) for detailed event format documentation.
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# OpenCode `run --format json` Event Cheatsheet
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`opencode run --format json` writes one JSON object per line (JSONL) to stdout.
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Each line has a `type` field indicating the event type.
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## Event Types
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### `step_start`
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Marks the beginning of a processing step.
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Fields:
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- `type`: `"step_start"`
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- `timestamp`: Unix timestamp in milliseconds
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- `sessionID`: Session identifier (format: `ses_XXX`)
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- `part.id`: Part identifier
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- `part.sessionID`: Session ID (duplicated)
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- `part.messageID`: Message ID
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- `part.type`: `"step-start"`
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- `part.snapshot`: Git snapshot hash
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Example:
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```json
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{"type":"step_start","timestamp":1767036059338,"sessionID":"ses_494719016ffe85dkDMj0FPRbHK","part":{"id":"prt_b6b8e7ec7001qAZUB7eTENxPpI","sessionID":"ses_494719016ffe85dkDMj0FPRbHK","messageID":"msg_b6b8e702b0012XuEC4bGe0XhKa","type":"step-start","snapshot":"71db24a798b347669c0ebadb2dfad238f991753d"}}
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```
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### `tool_use`
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Tool invocation event. Emitted when a tool finishes (`status == "completed"`).
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Fields:
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- `type`: `"tool_use"`
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- `timestamp`: Unix timestamp in milliseconds
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- `sessionID`: Session identifier
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- `part.id`: Part identifier
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- `part.callID`: Unique call ID for this tool invocation
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- `part.tool`: Tool name (e.g., "bash", "read", "write", "grep")
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- `part.state.status`: `"completed"` (the CLI JSON output does not emit pending/running tool states)
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- `part.state.input`: Tool input parameters
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- `part.state.output`: Tool output (when completed)
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- `part.state.title`: Human-readable description
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- `part.state.metadata`: Additional metadata (exit codes, etc.)
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- `part.state.time.start`: Start timestamp
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- `part.state.time.end`: End timestamp
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Example:
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```json
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{"type":"tool_use","timestamp":1767036061199,"sessionID":"ses_494719016ffe85dkDMj0FPRbHK","part":{"id":"prt_b6b8e85bb001CzBoN2dDlEZJnP","sessionID":"ses_494719016ffe85dkDMj0FPRbHK","messageID":"msg_b6b8e702b0012XuEC4bGe0XhKa","type":"tool","callID":"r9bQWsNLvOrJGIOz","tool":"bash","state":{"status":"completed","input":{"command":"echo hello","description":"Print hello to stdout"},"output":"hello\n","title":"Print hello to stdout","metadata":{"output":"hello\n","exit":0,"description":"Print hello to stdout"},"time":{"start":1767036061123,"end":1767036061173}}}}
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```
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### `text`
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Text output from the model.
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Fields:
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- `type`: `"text"`
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- `timestamp`: Unix timestamp in milliseconds
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- `sessionID`: Session identifier
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- `part.id`: Part identifier
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- `part.type`: `"text"`
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- `part.text`: The actual text content
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- `part.time.start`: Start timestamp
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- `part.time.end`: End timestamp
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Example:
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```json
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{"type":"text","timestamp":1767036064268,"sessionID":"ses_494719016ffe85dkDMj0FPRbHK","part":{"id":"prt_b6b8e8ff2002mxSx9LtvAlf8Ng","sessionID":"ses_494719016ffe85dkDMj0FPRbHK","messageID":"msg_b6b8e8627001yM4qKJCXdC7W1L","type":"text","text":"```\nhello\n```","time":{"start":1767036064265,"end":1767036064265}}}
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```
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### `step_finish`
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Marks the end of a processing step.
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Fields:
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- `type`: `"step_finish"`
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- `timestamp`: Unix timestamp in milliseconds
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- `sessionID`: Session identifier
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- `part.id`: Part identifier
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- `part.type`: `"step-finish"`
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- `part.reason`: Optional. `"stop"` (final) or `"tool-calls"` (continuing) when present.
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- `part.snapshot`: Git snapshot hash
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- `part.cost`: Cost in USD
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- `part.tokens.input`: Input token count
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- `part.tokens.output`: Output token count
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- `part.tokens.reasoning`: Reasoning token count
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- `part.tokens.cache.read`: Cache read tokens
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- `part.tokens.cache.write`: Cache write tokens
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Example (final step):
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```json
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{"type":"step_finish","timestamp":1767036064273,"sessionID":"ses_494719016ffe85dkDMj0FPRbHK","part":{"id":"prt_b6b8e9209001ojZ4ECN1geZISm","sessionID":"ses_494719016ffe85dkDMj0FPRbHK","messageID":"msg_b6b8e8627001yM4qKJCXdC7W1L","type":"step-finish","reason":"stop","snapshot":"09dd05d11a4ac013136c1df10932efc0ad9116e8","cost":0.001,"tokens":{"input":671,"output":8,"reasoning":0,"cache":{"read":21415,"write":0}}}}
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```
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Example (tool-calls step):
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```json
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{"type":"step_finish","timestamp":1767036061205,"sessionID":"ses_494719016ffe85dkDMj0FPRbHK","part":{"id":"prt_b6b8e85fb001L4I3WHMqH6EQNI","sessionID":"ses_494719016ffe85dkDMj0FPRbHK","messageID":"msg_b6b8e702b0012XuEC4bGe0XhKa","type":"step-finish","reason":"tool-calls","snapshot":"ee3406d50c7d9048674bbb1a3e325d82513b74ed","cost":0,"tokens":{"input":21772,"output":110,"reasoning":0,"cache":{"read":0,"write":0}}}}
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```
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### `error`
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Session error event.
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Fields:
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- `type`: `"error"`
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- `timestamp`: Unix timestamp in milliseconds
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- `sessionID`: Session identifier
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- `error.name`: Error type
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- `error.data.message`: Human-readable error (when available)
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Example:
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```json
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{"type":"error","timestamp":1767036065000,"sessionID":"ses_494719016ffe85dkDMj0FPRbHK","error":{"name":"APIError","data":{"message":"Rate limit exceeded","statusCode":429,"isRetryable":true}}}
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```
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## Mapping to Takopi Events
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| OpenCode Event | Takopi Event | Condition |
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|----------------|--------------|-----------|
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| `step_start` | `StartedEvent` | First occurrence |
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| `tool_use` | `ActionEvent(phase="completed")` | `status == "completed"` |
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| `text` | (accumulate text) | - |
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| `step_finish` | `CompletedEvent` | `reason == "stop"` |
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| `step_finish` | (ignored) | `reason == "tool-calls"` |
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| `error` | `CompletedEvent(ok=False)` | - |
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If `step_finish` omits `reason`, Takopi treats a clean process exit as successful completion and emits `CompletedEvent(ok=True)` with accumulated usage.
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## Session ID Format
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OpenCode uses session IDs in the format: `ses_XXXXXXXXXXXXXXXXXXXX`
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Example: `ses_494719016ffe85dkDMj0FPRbHK`
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## Tool Types
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Common tool names in OpenCode:
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- `bash`: Shell command execution
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- `read`: Read file contents
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- `write`: Write file contents
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- `edit`: Edit file contents
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- `glob`: File pattern matching
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- `grep`: Content search
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- `webfetch`: Fetch web content
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- `websearch`: Web search
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- `task`: Spawn sub-agent tasks
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# OpenCode to Takopi Event Mapping
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This document describes how OpenCode JSON events are translated to Takopi's normalized event model.
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## Event Translation
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### StartedEvent
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Emitted on the first `step_start` event that contains a `sessionID`.
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```
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OpenCode: {"type":"step_start","sessionID":"ses_XXX",...}
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Takopi: StartedEvent(engine="opencode", resume=ResumeToken(engine="opencode", value="ses_XXX"))
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```
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### ActionEvent
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Tool usage is translated to action events. Note: `opencode run --format json` currently only emits `tool_use` events when the tool finishes (`status == "completed"`). Pending/running tool states exist in the schema but are not emitted by the CLI JSON stream.
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**Started phase** (when tool is pending/running, if emitted by the JSON stream):
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```
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OpenCode: {"type":"tool_use","part":{"tool":"bash","state":{"status":"pending",...}}}
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Takopi: ActionEvent(engine="opencode", action=Action(kind="command"), phase="started")
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```
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**Completed phase** (when tool finishes):
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```
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OpenCode: {"type":"tool_use","part":{"tool":"bash","state":{"status":"completed","metadata":{"exit":0}}}}
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Takopi: ActionEvent(engine="opencode", action=Action(kind="command"), phase="completed", ok=True)
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```
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### CompletedEvent
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Emitted on `step_finish` with `reason="stop"` or on `error` events.
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**Success**:
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```
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OpenCode: {"type":"step_finish","part":{"reason":"stop","tokens":{...},"cost":0.001}}
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Takopi: CompletedEvent(engine="opencode", ok=True, answer="<accumulated text>", usage={...})
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```
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If `step_finish` omits `reason`, Takopi treats a clean process exit as successful completion and emits `CompletedEvent(ok=True)` with the accumulated usage.
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**Error**:
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```
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OpenCode: {"type":"error","error":{"name":"APIError","data":{"message":"API rate limit exceeded"}}}
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Takopi: CompletedEvent(engine="opencode", ok=False, error="API rate limit exceeded")
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```
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## Tool Kind Mapping
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| OpenCode Tool | Takopi ActionKind |
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|---------------|-------------------|
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| `bash`, `shell` | `command` |
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| `edit`, `write`, `multiedit` | `file_change` |
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| `read` | `tool` |
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| `glob` | `tool` |
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| `grep` | `tool` |
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| `websearch`, `web_search` | `web_search` |
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| `webfetch`, `web_fetch` | `web_search` |
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| `todowrite`, `todoread` | `note` |
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| `task` | `tool` |
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| (other) | `tool` |
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## Usage Accumulation
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Token usage is accumulated across all `step_finish` events and reported in the final `CompletedEvent.usage`:
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```json
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{
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"total_cost_usd": 0.001,
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"tokens": {
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"input": 22443,
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"output": 118,
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"reasoning": 0,
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"cache_read": 21415,
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"cache_write": 0
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}
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}
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```
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@@ -43,6 +43,8 @@ The canonical ResumeLine embedded in chat MUST be the engine’s CLI resume comm
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- `claude --resume <id>`
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- `pi --session <path>`
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ResumeLine MUST resume the interactive session when the engine offers both interactive and headless modes. It MUST NOT point to a headless/batch command that requires a new prompt (e.g., a `run` subcommand that errors without a message).
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Takopi MUST treat the runner as authoritative for:
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- formatting a ResumeToken into a ResumeLine
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