[FEATURE]: exec variable substitution

[nikaro]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

I would like to be able to do exec variables substitution, example for retrieving credentials from op (1Password CLI):

{
  "$schema": "https://opencode.ai/config.json",
  "provider": {
    "anthropic": {
      "models": {},
      "options": {
        "apiKey": "{exec:op read 'op://Vault/Provider/token'}"
      }
    }
  }
}

Could be interesting for these issues:

• [FEATURE]: Store provider credentials in environment variables #5423
• [FEATURE]: Allow storage of secrets in system credential store. #4318

Looks like a previous attempt at something like that was done: #2405

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• [FEATURE]: Store provider credentials in environment variables #5423: Store provider credentials in environment variables (discusses credential management alternatives)
• [FEATURE]: Allow storage of secrets in system credential store. #4318: Allow storage of secrets in system credential store (related credential storage approach)
• [FEATURE]: allow shell commands in the frontmatter #5082: Allow shell commands in the frontmatter (uses shell command execution for config substitution)
• [FEATURE]: {env:MY_VAR} support in agent yaml #5054: {env:MY_VAR} support in agent yaml (variable substitution in config files)

Feel free to ignore if none of these address your specific case.

[nikaro]

@thdxr any chance this would get accepted as a feature? 🥺

[nikaro]

Closing in favor of older issue: #231