---
title: "Plugins"
description: "Extend OpenCode with plugins."
---

Plugins extend OpenCode in-process. They can transform agents, models, commands,
integrations, references, skills, and tools; intercept model requests and tool
execution; and call a location-scoped subset of the V2 client.

<Warning>
  The V2 plugin API is beta. Entrypoints, hooks, draft shapes, and configuration
  may change before the stable release. Use only the `/v2` exports described on
  this page; the root `@opencode-ai/plugin` API is the legacy API.
</Warning>

## Load plugins

Plugins can be loaded from npm packages, explicit local paths, or config
directories. Each module must have one default export containing a unique
plugin `id` and either a Promise `setup` function or an Effect `effect`
function.

### Configuration

Add ordered entries to the plural `plugins` field in `opencode.json(c)`:

```jsonc title="opencode.jsonc"
{
  "$schema": "https://opencode.ai/config.json",
  "plugins": [
    "opencode-acme-plugin@1.2.0",
    "@acme/opencode-plugin",
    "./plugins/local.ts",
    {
      "package": "./plugins/reviewer.ts",
      "options": {
        "agent": "reviewer",
        "strict": true
      }
    }
  ]
}
```

A string is either a package specifier or a local path. Local paths must start
with `./` or `../` and resolve relative to the configuration file containing
the entry. Absolute paths and `file://` URLs are also supported. Both scoped
packages and versioned package specifiers are supported.

Use the object form to pass JSON configuration to the plugin. OpenCode passes
`options` unchanged as `ctx.options`; omitted options become an empty object.
The plugin owns validation and defaults for its options.

See [Config](/config#locations) for configuration locations and precedence.
Entries from all applicable files are processed from lowest to highest
precedence rather than replacing the entire array.

### Local discovery

OpenCode automatically scans both of these directories in every discovered
OpenCode config directory:

```text
.opencode/plugin/
.opencode/plugins/
```

The equivalent global directories are
`~/.config/opencode/plugin/` and `~/.config/opencode/plugins/`. Direct `.ts` and
`.js` children are loaded. An immediate child directory is also loaded as a
package when OpenCode can resolve a string `exports`, `module`, or `main`
entrypoint, or an `index.ts` or `index.js` file.

A `plugin/` directory beside a project-root `opencode.json` is not discovered
automatically. Put it under `.opencode/`, or add its file explicitly with a
relative config entry.

### Enable and disable

A string beginning with `-` removes a previously selected target. `*` matches
everything, and a suffix of `.*` matches an ID or target prefix. Directives are
applied in order:

```jsonc title="opencode.jsonc"
{
  "plugins": [
    "-opencode.provider.*",
    "opencode.provider.openai",
    "-./plugin/old.ts",
    "-*",
    "./plugins/only-this-one.ts"
  ]
}
```

Use the same package specifier or resolved local target to remove an external
plugin. Built-in and embedded plugins can be selected by their plugin ID.
Explicit config directives run after local auto-discovery, so they can disable
discovered plugins.

User plugins are activated in configured order between OpenCode's internal
plugin phases. Hooks run sequentially in registration order, and later hooks
observe earlier mutations. Do not depend on the internal phase ordering while
the API is beta.

### Installation and dependencies

OpenCode installs bare package entries and their production dependencies into
an isolated cache. Package installation does not run lifecycle scripts.
Published packages should expose their plugin entrypoint and include every
runtime import in `dependencies`.

Local files and local package directories are imported directly. OpenCode does
**not** install their dependencies. Install dependencies in a `package.json`
visible from the plugin file, for example:

```sh
cd .opencode
bun add @opencode-ai/plugin@1.17.15 effect@4.0.0-beta.83
```

`effect` is required for Effect plugins and for the `Schema` values used by
typed tools. A Promise plugin that does not define tools may only need
`@opencode-ai/plugin`. Match these versions to the OpenCode release you target.

Configuration and discovered plugin files under watched config directories are
reloaded when they change. Reloading replaces the active plugin generation and
releases its scoped registrations. Restart OpenCode after changing an npm
package version or a local dependency when no watched file changed.

## Create a plugin

The Promise API is the simplest option. Export the result of `Plugin.define`
as the module default:

```ts title=".opencode/plugins/reviewer.ts"
import { Plugin } from "@opencode-ai/plugin/v2"

export default Plugin.define({
  id: "acme.reviewer",
  setup: async (ctx) => {
    const description =
      typeof ctx.options.description === "string"
        ? ctx.options.description
        : "Reviews code for regressions"

    await ctx.agent.transform((agents) => {
      agents.update("reviewer", (agent) => {
        agent.description = description
        agent.mode = "subagent"
      })
    })
  },
})
```

`setup` runs each time the plugin is activated for a Location. Register
long-lived behavior during setup; do not wait there on an infinite event
stream.

### Effect plugins

Use the Effect entrypoint when the implementation benefits from Effect
composition, fibers, or scoped resources:

```ts title=".opencode/plugins/reviewer-effect.ts"
import { Plugin } from "@opencode-ai/plugin/v2/effect"
import { Effect } from "effect"

export default Plugin.define({
  id: "acme.reviewer-effect",
  effect: (ctx) =>
    Effect.gen(function* () {
      yield* ctx.agent.transform((agents) => {
        agents.update("reviewer", (agent) => {
          agent.description = "Reviews code for regressions"
          agent.mode = "subagent"
        })
      })
    }),
})
```

The plugin effect is scoped. Finalizers, scoped fibers, and registrations are
released when the plugin reloads or unloads. OpenCode deliberately isolates the
effect from its private Core services; use only the public `ctx` capabilities.

## Context

Promise methods return Promises; the equivalent Effect methods return
`Effect`. Read and action methods use the same inputs and location-aware
responses as the V2 client APIs.

| Capability | Available operations |
| --- | --- |
| `ctx.agent` | `list`, `transform`, `reload` |
| `ctx.catalog.provider` | `list`, `get` |
| `ctx.catalog.model` | `list`, `default` |
| `ctx.catalog` | `transform`, `reload` |
| `ctx.command` | `list`, `transform`, `reload` |
| `ctx.integration` | `list`, `get`, `connect`, `attempt`, `transform`, `reload`, and connection lookup/resolution |
| `ctx.plugin` | `list` currently active plugin IDs |
| `ctx.reference` | `list`, `transform`, `reload` |
| `ctx.session` | `create`, `get`, `prompt`, `command`, `interrupt`, and `hook` |
| `ctx.skill` | `list`, `transform`, `reload` |
| `ctx.tool` | `transform` and `hook` |
| `ctx.aisdk` | `hook` |
| `ctx.event` | `subscribe` to the current public server event stream |
| `ctx.options` | Readonly options from the matching config object |

Unlike the legacy API, V2 does not provide `$`, `directory`, `worktree`, or a
general SDK client on the context. A plugin is Location-scoped, and the exposed
domain clients apply that Location by default.

### Transform hooks

Transforms synchronously edit a draft whenever a stateful domain is built.
Registering or disposing a transform rebuilds the domain from fresh state and
runs all active transforms in order. Call the domain's `reload()` method when
external data captured by a transform changes.

| Transform | Draft operations |
| --- | --- |
| `agent.transform` | `list`, `get`, `default`, `update`, `remove` |
| `catalog.transform` | Provider `list`, `get`, `update`, `remove`; model `get`, `update`, `remove`; default model `get`, `set` |
| `command.transform` | `list`, `get`, `update`, `remove` |
| `integration.transform` | Integration `list`, `get`, `update`, `remove`; method `list`, `update`, `remove` |
| `reference.transform` | `add`, `remove`, `list` |
| `skill.transform` | `source`, `list` |
| `tool.transform` | `add` |

Hook registrations are owned by the plugin scope. Transform and runtime hook
calls also return a `Registration` with `dispose` for explicit cleanup. Tool
contributions currently remain until the owning plugin scope closes, so prefer
scope cleanup for plugin-wide teardown while this API is beta.

### Runtime hooks

Runtime hooks intercept live operations. Their event objects expose specific
mutable fields:

| Hook | Mutable fields |
| --- | --- |
| `ctx.aisdk.hook("sdk", callback)` | `sdk`, after inspecting `model`, `package`, and `options` |
| `ctx.aisdk.hook("language", callback)` | `language`, after inspecting `model`, `sdk`, and `options` |
| `ctx.session.hook("request", callback)` | `system`, `messages`, and the `tools` record immediately before model dispatch |
| `ctx.tool.hook("execute.before", callback)` | `input`, before the selected tool executes |
| `ctx.tool.hook("execute.after", callback)` | `result`, `output`, and `outputPaths`, after execution settles |

For example, remove a tool from selected model requests and normalize another
tool's input:

```ts title=".opencode/plugins/guards.ts"
import { Plugin } from "@opencode-ai/plugin/v2"

export default Plugin.define({
  id: "acme.guards",
  setup: async (ctx) => {
    await ctx.session.hook("request", (event) => {
      delete event.tools.write
    })

    await ctx.tool.hook("execute.before", (event) => {
      if (event.tool !== "lookup" || typeof event.input !== "object" || event.input === null) return
      event.input = { ...event.input, source: "plugin" }
    })
  },
})
```

A hook failure fails the operation it intercepts. Keep runtime hooks fast and
handle expected errors inside the callback.

## Add a tool

Use `Tool.make` with Effect schemas. Promise tools use async executors:

```ts title=".opencode/plugins/greeting.ts"
import { Plugin } from "@opencode-ai/plugin/v2"
import { Tool } from "@opencode-ai/plugin/v2/tool"
import { Schema } from "effect"

const greeting = Tool.make({
  description: "Create a greeting",
  input: Schema.Struct({ name: Schema.String }),
  output: Schema.String,
  execute: async ({ name }) => `Hello, ${name}!`,
})

export default Plugin.define({
  id: "acme.greeting",
  setup: async (ctx) => {
    await ctx.tool.transform((tools) => {
      tools.add("greeting", greeting)
    })
  },
})
```

Unsupported characters in tool and group names are normalized to underscores.
The resulting exposed key must begin with a letter and contain at most 64
letters, digits, underscores, or hyphens. `tools.add` also accepts
`{ group, deferred }`:

- `group` prefixes and groups the exposed tool name.
- `deferred: true` makes the tool available through the deferred `execute`
  tool instead of exposing it directly.

The executor receives a second context argument containing `sessionID`,
`agent`, `assistantMessageID`, and `toolCallID`. Use
`Tool.withPermission(tool, "permission-name")` to assign a permission key.
Effect plugins import the helper from `@opencode-ai/plugin/v2/effect/tool` and
return an `Effect` from `execute`.

## Types

`Plugin.define` infers the context and callbacks. The Promise root also
re-exports the canonical `Agent`, `Command`, `Connection`, `Credential`,
`Integration`, `Model`, `Provider`, `Reference`, and `Skill` schema namespaces.
Import narrower API types from their public subpaths when needed:

```ts
import { Plugin, Model } from "@opencode-ai/plugin/v2"
import type { Context } from "@opencode-ai/plugin/v2/plugin"
import type { AgentDraft } from "@opencode-ai/plugin/v2/agent"
import type { ToolExecuteBeforeEvent } from "@opencode-ai/plugin/v2/tool"
```

Effect equivalents live below `@opencode-ai/plugin/v2/effect`, such as
`@opencode-ai/plugin/v2/effect/plugin` and
`@opencode-ai/plugin/v2/effect/tool`. Avoid importing types or runtime values
from `@opencode-ai/core` or `@opencode-ai/server`; those are private host
implementation details.

## Publish a package

A package plugin uses the same default export as a local plugin. A minimal
manifest is:

```json title="package.json"
{
  "name": "opencode-acme-plugin",
  "version": "1.0.0",
  "type": "module",
  "exports": "./src/index.ts",
  "dependencies": {
    "@opencode-ai/plugin": "1.17.15",
    "effect": "4.0.0-beta.83"
  }
}
```

Use versions compatible with the OpenCode release you target and test the
installed package, not only a workspace-linked copy. Because the plugin API is
beta, publish compatible plugin updates when V2 entrypoints or contracts
change.

## Verify loading

List active plugin IDs for the current Location through the V2 API:

```sh
opencode2 api get /api/plugin
```

If a plugin is absent, check the server log described in
[Troubleshooting](/troubleshooting#read-logs). Invalid modules and setup failures are
logged; one failing package does not prevent unrelated valid packages from
being resolved.