opencode/packages/docs/config.mdx

---
title: "Config"
description: "Configure OpenCode."
---

<Tip>
  You shouldn't have to configure OpenCode manually. Ask OpenCode to update its configuration for you.
</Tip>

## Format

OpenCode supports both **JSON** and **JSONC** (JSON with Comments) configuration files.

```jsonc title="opencode.jsonc"
{
  "$schema": "https://opencode.ai/config.json",
  "model": "openai/gpt-5.2-custom",
  "providers": {
    "openai": {
      "models": {
        "gpt-5.2-custom": {
          "modelID": "gpt-5.2",
          "name": "GPT-5.2 Custom"
        }
      }
    }
  }
}
```

## Locations

OpenCode loads global configuration from:

```text
~/.config/opencode/opencode.json(c)
```

Project-specific configuration can use either form:

```text
/home/user/projects/my-app/opencode.json(c)
/home/user/projects/my-app/.opencode/opencode.json(c)
```

When OpenCode starts, it searches for configuration files from the current
directory upward to the project root. The files are merged, and configuration
closer to the current directory takes precedence.

For example, consider a monorepo with OpenCode started from
`/home/user/projects/acme/packages/web`:

```text
~/.config/opencode/opencode.json

/home/user/projects/acme/
├── opencode.json
└── packages/
    └── web/
        ├── opencode.json
        └── src/
```

OpenCode applies these files from lowest to highest precedence:

1. `~/.config/opencode/opencode.json`
2. `/home/user/projects/acme/opencode.json`
3. `/home/user/projects/acme/packages/web/opencode.json`

Settings in the package config override matching settings from the repository
config, which override matching settings from the global config. Settings that
do not conflict are preserved from every file.

## Schema

The complete OpenCode configuration schema is available at
[opencode.ai/config.json](https://opencode.ai/config.json).

Add the `$schema` field to your configuration file to enable validation and
autocomplete in editors that support JSON Schema:

```json title="opencode.json"
{
  "$schema": "https://opencode.ai/config.json"
}
```

Use the schema as the source of truth for available fields, accepted values,
and nested configuration shapes.

### Shell

Set the shell used by the terminal and shell tools.

```jsonc
{
  "shell": "/bin/zsh"
}
```

### Model

Set the default model in `provider/model` format. Add `#variant` to select a
specific model variant.

```jsonc
{
  "model": "anthropic/claude-sonnet-4-5#high"
}
```

See the [models guide](https://opencode.ai/docs/models/) for model selection
and local models.

### Default agent

Choose the primary agent used when a session does not select one explicitly.

```jsonc
{
  "default_agent": "build"
}
```

See the [agents guide](https://opencode.ai/docs/agents/) for built-in and custom
agents.

### Autoupdate

Control automatic updates. Set this to `false` to disable updates or `"notify"`
to receive update notifications.

```jsonc
{
  "autoupdate": false
}
```

### Sharing

Control whether sessions can be shared manually, shared automatically, or not
shared at all.

```jsonc
{
  "share": "manual"
}
```

See the [sharing guide](https://opencode.ai/docs/share/) for more details.

### Username

Set the username displayed in conversations.

```jsonc
{
  "username": "alice"
}
```

### Permissions

Define ordered rules that allow, deny, or ask before an agent uses a tool on a
matching resource.

```jsonc
{
  "permissions": [
    {
      "action": "bash",
      "resource": "git push *",
      "effect": "ask"
    }
  ]
}
```

See the [permissions guide](https://opencode.ai/docs/permissions/) for rule
matching and available actions.

### Agents

Override built-in agents or define specialized agents with their own model,
instructions, mode, and permissions.

```jsonc
{
  "agents": {
    "reviewer": {
      "description": "Review changes without editing files",
      "mode": "subagent",
      "system": "Focus on correctness, security, and missing tests.",
      "permissions": [
        { "action": "edit", "resource": "*", "effect": "deny" }
      ]
    }
  }
}
```

See the [agents guide](https://opencode.ai/docs/agents/) for all agent options
and file-based agents.

### Snapshots

Enable or disable the snapshots used by undo and revert behavior.

```jsonc
{
  "snapshots": false
}
```

### Watcher

Ignore files and directories that should not trigger filesystem updates.

```jsonc
{
  "watcher": {
    "ignore": ["dist/**", "coverage/**"]
  }
}
```

### Formatter

Enable built-in formatters, disable formatting entirely, or configure formatter
commands by name.

```jsonc
{
  "formatter": {
    "prettier": {
      "command": ["bunx", "prettier", "--write", "$FILE"],
      "extensions": [".js", ".ts", ".tsx"]
    }
  }
}
```

See the [formatters guide](https://opencode.ai/docs/formatters/) for built-in
formatters and custom commands.

### LSP

Enable built-in language servers, disable them, or configure servers by name.

```jsonc
{
  "lsp": {
    "typescript": {
      "command": ["typescript-language-server", "--stdio"],
      "extensions": [".ts", ".tsx"]
    }
  }
}
```

See the [LSP guide](https://opencode.ai/docs/lsp/) for language server setup.

### Attachments

Control how oversized image attachments are resized or rejected before they are
sent to a model.

```jsonc
{
  "attachments": {
    "image": {
      "auto_resize": true,
      "max_width": 2000,
      "max_height": 2000,
      "max_base64_bytes": 5242880
    }
  }
}
```

### Tool output

Set the maximum number of lines and bytes retained from a tool result.

```jsonc
{
  "tool_output": {
    "max_lines": 2000,
    "max_bytes": 51200
  }
}
```

### MCP

Configure local and remote Model Context Protocol servers. Global timeouts can
be overridden by an individual server.

```jsonc
{
  "mcp": {
    "servers": {
      "playwright": {
        "type": "local",
        "command": ["bunx", "@playwright/mcp"]
      }
    }
  }
}
```

See the [MCP guide](https://opencode.ai/docs/mcp-servers/) for remote servers,
OAuth, environment variables, and timeouts.

### Compaction

Control automatic context compaction and how much recent context it preserves.

```jsonc
{
  "compaction": {
    "auto": true,
    "keep": {
      "tokens": 8000
    },
    "buffer": 20000
  }
}
```

### Skills

Add directories or URLs that OpenCode should search for agent skills.

```jsonc
{
  "skills": ["./team-skills", "https://example.com/.well-known/skills/"]
}
```

See the [skills guide](https://opencode.ai/docs/skills/) for skill structure and
automatic discovery under `.opencode/skills/`.

### Commands

Define reusable slash commands as named prompt templates.

```jsonc
{
  "commands": {
    "review": {
      "description": "Review the current changes",
      "template": "Review the current diff for correctness and missing tests."
    }
  }
}
```

See the [commands guide](https://opencode.ai/docs/commands/) for arguments,
models, agents, and file-based commands.

### Instructions

Load additional instruction files, globs, or URLs into the agent's context.

```jsonc
{
  "instructions": ["CONTRIBUTING.md", "docs/guidelines/*.md"]
}
```

See the [rules guide](https://opencode.ai/docs/rules/) for project instructions
and `AGENTS.md`.

### References

Make local directories or Git repositories available as named supporting
context.

```jsonc
{
  "references": {
    "docs": {
      "path": "../product-docs",
      "description": "Product behavior and terminology"
    },
    "effect": {
      "repository": "Effect-TS/effect",
      "branch": "main"
    }
  }
}
```

See the [references guide](https://opencode.ai/docs/references/) for shorthand,
visibility, and path resolution.

### Plugins

Load plugins from packages or local files. Use the object form when a plugin
accepts options.

```jsonc
{
  "plugins": [
    "opencode-example-plugin",
    {
      "package": "./plugins/local.ts",
      "options": {
        "enabled": true
      }
    }
  ]
}
```

See the [plugins guide](/plugins) for plugin development and configuration.

### Providers

Configure providers and add or override their models, request settings,
headers, and model variants.

```jsonc
{
  "providers": {
    "openai": {
      "models": {
        "gpt-5.2-custom": {
          "modelID": "gpt-5.2",
          "name": "GPT-5.2 Custom",
          "limit": {
            "context": 200000,
            "output": 32000
          }
        }
      }
    }
  }
}
```

See the [providers guide](https://opencode.ai/docs/providers/) for credentials,
custom endpoints, provider packages, and model configuration.