OpenCode

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OpenCode is an open-source AI coding agent that runs in the terminal and can be used alongside any editor or IDE.

Key Features

LSP support that loads the right language tooling for the model
Multi-session workflows so you can run multiple agents on the same project
Shareable session links for collaboration and debugging
MCP support for external tools and data sources
Editor-agnostic workflow that works in any IDE

Installation and Setup

Add the npm registry:

npm config set @aie:registry https://plugins.dev.aie.ai.t-systems.net/v1/npm

Install OpenCode globally:
Terminal window
```
npm install -g @aie/opencode
```
If you are on Windows and need a proxy, set the required environment variables before starting OpenCode.
Get an API key from the portal:
- AI Foundation Services API Key Portal
Run:
Terminal window
```
opencode auth login https://plugins.dev.aie.ai.t-systems.net
```
This sets up OpenCode with the configuration published at https://plugins.dev.aie.ai.t-systems.net/.well-known/opencode, which we recommend for compliant usage with AI Foundation Services models.
Run OpenCode:
Terminal window
```
opencode
```
In OpenCode, run the following command to choose your provider and sign in with your API key:
Terminal window
```
/connect
```
Select AI Foundation Services from the provider list, then provide your API key when prompted.

You can now start a chat and use OpenCode.

Example Config

If you’d rather configure OpenCode declaratively (or pin a default model and base URL), create opencode.json at your project root or ~/.config/opencode/opencode.json for a global default:

{
  "$schema": "https://opencode.ai/config.json",
  "model": "openai/gpt-4.1", // Set your default model (format: provider_id/model_id)

  "provider": {
    "openai": {
      "options": {
        "baseURL": "https://llm-server.llmhub.t-systems.net/v2"
      }
    }
  },

  // Set permissions for built-in tools
  "permission": {
    "edit": "allow",
    "websearch": "allow"
  }
}

OpenCode automatically picks up OPENAI_API_KEY from your environment, so the config only needs the baseURL. If you set the variable during the Quickstart, no further key configuration is needed here.