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Provider credentials are never stored in Celly or the repository. They are registered with sbx and injected by the sandbox’s forward proxy, so the agent uses them without ever seeing them in a config file or a command line.

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Built-in providers

For providers sbx knows about, register the credential interactively:
For example, to add an Anthropic key:
sbx stores the secret and exposes it to sandboxes through the proxy. Repeat per provider.

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Custom providers

For a provider that is not built in, register the host and the environment variable name that should carry the secret:
This tells the proxy to inject DEEPSEEK_API_KEY for requests to api.deepseek.com. Use the provider’s API host and the exact environment variable name OpenCode expects.
sbx secret set-custom is global by default, so the credential applies to every sandbox on the host. Sandboxes that already exist must be recreated (/project remove then /project add <name> <path>, or stop and recreate) to pick up a newly added secret.

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Network policy

The sandbox egress policy is the balanced preset (initialized with sbx policy init balanced), which is the floor for every sandbox. A provider’s API host must be reachable under that policy.
  • Built-in providers are covered by the preset.
  • A custom provider host may need to be allowed explicitly for the sandbox to reach it. Verify with sbx policy ls and adjust per sandbox where useful.
See the security reference for how egress and credentials fit into the threat model.

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Selecting a model per thread

Models are chosen inside a thread with /model. Because a flattened list across all providers can overflow Discord’s 25-option select menu, /model is a two-step flow:
  1. /model shows a provider picker (for example anthropic (12)).
  2. Picking a provider shows that provider’s models; choosing one sets it for the thread.
/agent works the same way but in a single step, since the agent list is not paginated by provider.
Both commands wake the project’s sandbox before asking it for models or agents, and they only work inside a thread. Model and agent overrides are stored per thread; a thread with neither set uses the DEFAULT_MODEL / DEFAULT_AGENT seeded at first boot.

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Verify

After configuring a provider, ask the agent something in a thread. If replies fail, check that the provider host is reachable under the network policy and that the sandbox was created (or recreated) after the secret was registered.