OpenCode Drive

Use opencode-drive to launch an isolated OpenCode instance and control its TUI and simulated LLM.

Default to a one-shot Effect program. Use defineScript for named, visible, restartable, or manual-launch workflows; it is also Effect-only. Use live commands only for interactive development against a persistent or visible instance.

Catalog State IDs

Browse and copy OpenCode terminal state IDs from:

https://catalog.kitlangton.dev

Replayable flow states expose canonical <flow-id>/<state-id> addresses, for example:

patch-success-lifecycle/permission-prompt

Reproduce one from an opencode-drive source checkout:

bun run catalog:reproduce -- patch-success-lifecycle/permission-prompt \
  --opencode /path/to/opencode \
  --output /tmp/permission-prompt.frame.json

The command executes the registered recipe only through that checkpoint and writes an opencode-terminal-frame-v1 artifact. Only flows in apps/catalog/scenarios/index.ts are replayable. Browse-only flows and screen cards copy standalone capture IDs instead; do not invent a flow prefix. Use a protocol-compatible OpenCode checkout, ideally the source revision shown by the selected capture set.

To compare a committed local OpenCode branch against current v2 across every catalog state:

bun run catalog:capture -- \
  --opencode /path/to/opencode \
  --revision origin/v2 \
  --revision HEAD

Add repeated --theme flags to capture the same commit pair under multiple themes. Capture resolves detached immutable worktrees, retains earlier sets, and sorts sets by commit time. Uncommitted changes are excluded by design.

Effect Programs

Write drive.ts as a default-exported, fully provided Effect, then run it directly:

import { Effect } from "effect"
import { Llm, OpenCodeDriver } from "opencode-drive"

export default OpenCodeDriver.use(
  {
    project: {
      git: true,
      files: {
        "src/value.ts": "export const value = 1\n",
      },
    },
  },
  ({ ui, llm }) =>
    Effect.gen(function* () {
      yield* llm.queue(Llm.text("The value is 1."))
      yield* ui.submit("Read src/value.ts")
      yield* ui.waitFor("The value is 1.")
      yield* ui.screenshot("result")
    }),
)

opencode-drive run ./drive.ts

run type-checks the module before importing it and requires its default export to be an Effect<unknown, unknown, never>. It accepts exactly one module path; it does not accept --command.* flags or application arguments after --.

OpenCodeDriver.use is the normal lifecycle boundary. It creates an isolated project, starts the server and primary TUI, races the program against backend failure, settles queued LLM work, closes all TUIs, exports recordings, and removes the artifact directory unless keepArtifacts: true is set. Settlement failures fail the program.

Use OpenCodeDriver.make only when explicit settlement is necessary. It requires a scope, and the program must call driver.settle() before leaving that scope.

Deterministic Project DSL

Declare the project, semantic OpenCode configuration, and TUI configuration in OpenCodeDriver.use options:

export default OpenCodeDriver.use(
  {
    project: {
      git: true,
      files: { "README.md": "# Fixture\n" },
    },
    config: {
      autoupdate: false,
      username: "Drive",
    },
    tuiConfig: {
      theme: "system",
      scroll_speed: 1,
    },
    setup: ({ fs, config, tuiConfig }) =>
      Effect.gen(function* () {
        yield* fs.writeFile("src/setup.ts", "export const ready = true\n")
        config.username = "Setup wins"
        tuiConfig.scroll_speed = 2
      }),
  },
  ({ ui }) => ui.screenshot("home"),
)

The DSL is applied in this order:

1. project.files is written into the isolated project.
2. config and tuiConfig are deeply merged over .opencode/opencode.jsonc and .opencode/tui.jsonc fixture values. Objects merge recursively; arrays and scalar values replace existing values.
3. setup runs and may write project files or mutate the merged config and tuiConfig objects. Its mutations take final precedence.
4. Drive writes both configs as stable, formatted JSON. With project.git: true, it creates a repository and commits the complete pre-launch state with fixed Git identity and timestamps.

fs.writeFile is rooted inside the simulated project and creates parent directories. project.git: true refuses to replace existing Git metadata; omit it when prepared fixtures already include a repository.

UI And LLM

UI operations are Effects:

• ui.submit(text) types and presses Enter.
• ui.state(), ui.capture(), and ui.matches(text) inspect the terminal.
• ui.snapshot() returns the versioned semantic tree; ui.getNode(query, options?) polls for one exact semantic match.
• ui.waitFor(textOrPredicate, options?) polls until a match.
• ui.getElement(query, options?), ui.focus(...), and ui.click(...) target interactive elements.
• ui.screenshot(name?) exports an image and returns its absolute path.
• ui.resize({ cols, rows }), ui.press(...), and ui.arrow(...) control the TUI.

Build deterministic simulated responses with the Llm namespace and schedule them through the driver's llm controller:

yield* llm.queue(
  Llm.reasoning("Checking the fixture"),
  Llm.pause(20),
  Llm.text("The value is 1.", { delay: 2, chunkSize: 15 }),
)

llm.queue(...) declares the next response without waiting. llm.send(...) waits for the next request and completes its response. For ongoing responses, the handler passed to llm.serve returns an Effect Stream; registering the handler is an Effect. Available outputs include text, reasoning, pause, toolCall, raw, finish, and disconnect; a normal response gets finish("stop") when no terminal output is supplied.

import { Stream } from "effect"
import { Llm } from "opencode-drive"

yield* llm.serve((_request, index) =>
  Stream.make(Llm.text(`Response ${index + 1}`)),
)

Use the capability names literally: opencode is the generated OpenCode SDK, tui is the primary frontend process, ui is tui.ui, and tuis launches additional frontend processes.

Additional TUIs share the server and LLM controller:

const secondary = yield* tuis.launch({
  viewport: { cols: 120, rows: 40 },
  recording: true,
})
yield* secondary.ui.screenshot("secondary")

Reports And Paths

OpenCodeDriver exports a branded AbsolutePath schema and a compact RunReport containing the artifact root, retention, recording paths, and endpoint compatibility. It also exports decodeAbsolutePath and decodeRunReport for validating unknown values.

driver.settle() returns the report with its recording paths. Use OpenCodeDriver.useReport(options, run) when a safe lifecycle program also needs the report alongside its result.

Drive prefers protocol negotiation and reports explicit legacy fallback. Set opencode.compatibility to "required" when protocol skew must fail before the program runs. Additional built-in tool adapters remain follow-ups.

Arbitrary Dynamic Tools

Use runtime tools.attach for tools that do not have a shipped Drive adapter. Attachment replaces the complete dynamic set without affecting configured static adapters. Take invocations by the model call ID, while Drive owns producer IDs, progress sequences, reconnect replay, and exactly-one terminal commitment.

yield* tools.attach({
  tools: [
    {
      name: "lookup",
      description: "Look up a value",
      inputSchema: {
        type: "object",
        properties: { query: { type: "string" } },
        required: ["query"],
      },
      options: { codemode: false },
    },
  ],
})

const lookup = yield* tools.take("call_lookup")
yield* lookup.progress({ structured: { phase: "searching" } })
yield* lookup.finish({
  structured: { answer: 42 },
  content: [{ type: "text", text: "42" }],
})

Use awaitCancelled() to observe native interruption. Do not synthesize cancellation or expose transport sequence numbers. Dynamic effective names may not collide with configured shell, webfetch, or websearch adapters.

Simulated Shell Execution

Declare the built-in tools Drive should intercept, then control each invocation from the running program. Unregistered tools remain real. Calls may be accepted in arrival order or by the stable ID supplied in Llm.toolCall, so parallel invocations can progress and settle independently.

import { Effect } from "effect"
import { Llm, OpenCodeDriver } from "opencode-drive"

export default OpenCodeDriver.use({ tools: ["shell"] }, ({ tools, llm, ui }) =>
  Effect.gen(function* () {
    const shells = yield* tools.control("shell")
    yield* llm.queue(
      Llm.toolCall({
        index: 0,
        id: "call_shell",
        name: "shell",
        input: { command: "compile" },
      }),
      Llm.finish("tool-calls"),
    )
    yield* ui.submit("Compile the project")
    const shell = yield* shells.take("call_shell")
    yield* shell.progress(`Running ${shell.input.command}\n`)
    yield* shell.succeed({ output: "Controlled success\n", exit: 0 })
  }),
)

The same declaration and runtime tools capability are available in defineScript. Supported adapters are shell, webfetch, and websearch. Each progress value replaces the visible tool output, so send accumulated text when earlier lines should remain visible. Calls settle exactly once; awaitInterrupted() observes session interruption or transport disconnection.

The callback form remains available for fixed behavior that does not need runtime orchestration:

import { Effect } from "effect"
import { Tool } from "opencode-drive"

const tools = (registry: Tool.Registry) => {
  registry.handle("shell", ({ input, progress }) =>
    Effect.gen(function* () {
      yield* progress(`Running ${input.command}\n`)
      return { output: "Controlled success\n", exit: 0 }
    }),
  )
}

Foreground callback handler Effects are interrupted when OpenCode interrupts the session, the transport disconnects, or Drive shuts down. Detached background shell handlers continue after their launch response and are interrupted when Drive shuts down.

Effect Scripts

Use defineScript with start --script when the workflow must have a stable instance name, be visible, rerun on restart, or explicitly launch and kill its server and TUIs. setup and run return Effects. Operations on fs, ui, llm, tools, server, and tuis also return Effects; there is no Promise API or compatibility shim.

import { Effect } from "effect"
import { defineScript, Llm } from "opencode-drive"

export default defineScript({
  config: { autoupdate: false },
  tuiConfig: { theme: "system" },
  project: {
    git: true,
    files: { "src/value.ts": "export const value = 1\n" },
  },
  run: ({ ui, llm }) =>
    Effect.gen(function* () {
      yield* llm.queue(Llm.text("The value is 1."))
      yield* ui.submit("Read src/value.ts")
      yield* ui.waitFor("The value is 1.")
    }),
})

Always type-check a script before starting it:

opencode-drive check ./drive.ts
opencode-drive start --name demo --script ./drive.ts

For a new script, run opencode-drive script init ./drive.ts once. It creates a canonical Effect-native starter and refuses to overwrite an existing file. check adds focused migration guidance when it finds Promise-style script callbacks.

The script DSL applies project, config, tuiConfig, and setup with the same deterministic ordering described above. Automatic scripts run again after opencode-drive restart --name demo.

Use launch: "manual" only when the workflow must control server and TUI restarts itself. In manual mode tui and ui are null; run server.launch() before tuis.launch(name). Only one server may run at a time, server.kill() permits relaunch, and a closed TUI name may be reused.

export default defineScript({
  launch: "manual",
  run: ({ server, tuis }) =>
    Effect.gen(function* () {
      yield* server.launch()
      const alice = yield* tuis.launch("alice", { recording: true })
      yield* alice.ui.screenshot("alice")
      yield* alice.close()
    }),
})

Cancellation uses Effect interruption. Interrupting the script or an operation's fiber interrupts in-flight work and runs scoped finalizers; do not introduce AbortSignal or Promise cancellation wrappers.

Prepare An Instance

Use init only when files must be copied into an isolated home or project before a named live or scripted instance starts:

artifacts=$(opencode-drive init --name demo)
cp -R ./fixtures/home/. "$artifacts/"
cp -R ./fixtures/project/. "$artifacts/files/"
opencode-drive start --name demo --dev ~/projects/opencode

The simulated project is under $artifacts/files. A later start --name demo reuses the prepared artifacts; otherwise start initializes them automatically.

Drive uses an in-memory OpenCode database by default. For a script that restarts the OpenCode service and must recover the same sessions, set OPENCODE_DRIVE_DB to a file-backed path. Relative paths resolve inside the isolated run's OpenCode data directory:

OPENCODE_DRIVE_DB=restart.sqlite \
  opencode-drive start --name restart-demo --script ./restart.ts

Live Interaction

Use live commands to inspect or iterate on a persistent instance. Headless start requires a unique --name; visible instances may omit it. Headless start detaches after the instance is ready, so do not add &. Always stop the instance when finished.

opencode-drive start --name demo

opencode-drive send --name demo \
  --command.ui.type '{"text":"Explain this project"}' \
  --command.ui.enter

opencode-drive send --name demo --command.ui.state
opencode-drive send --name demo --command.ui.capture
opencode-drive send --name demo --command.ui.screenshot
opencode-drive stop --name demo

send executes command flags from left to right. JSON-valued commands take one JSON argument. Supported commands are:

• --command.ui.type '{"text":"..."}'
• --command.ui.press '{"key":"p","modifiers":{"ctrl":true}}'
• --command.ui.enter
• --command.ui.arrow '{"direction":"down"}'
• --command.ui.focus '{"target":12}'
• --command.ui.click '{"target":12,"x":4,"y":1}'
• --command.ui.resize '{"cols":120,"rows":40}'
• --command.ui.screenshot or --command.ui.screenshot '{"name":"home"}'
• --command.ui.state
• --command.ui.snapshot
• --command.ui.capture
• --command.ui.matches '{"text":"OpenCode"}'
• --command.ui.recording.finish

Start with --record to record a headless live instance. stop finishes the recording, exports the MP4, performs owner cleanup, and prints the path.

opencode-drive start --name demo --record
opencode-drive stop --name demo

dir prints a live instance's artifact directory, and list lists active instances:

opencode-drive dir --name demo
opencode-drive list

Prune

prune removes inactive artifact directories. To remove one instance's artifacts, pass the instance name supplied to init or start, not the generated run-* artifact directory name:

opencode-drive prune --name demo

# Force removal of all artifact directories, including active ones.
opencode-drive prune --force