* Support shell command execution for API key resolution in models.json
Add ! prefix support to apiKey field in models.json to execute shell commands
and use stdout as the API key. This allows users to store API keys in secure
credential managers like macOS Keychain, 1Password, Bitwarden, or HashiCorp Vault.
Example: "apiKey": "!security find-generic-password -ws 'anthropic'"
The apiKey field now supports three formats:
- !command - executes shell command, uses trimmed stdout
- ENV_VAR_NAME - uses environment variable value
- literal - uses value directly
fixes#697
* feat(coding-agent): cache API key command results for process lifetime
Shell commands (! prefix) are now executed once and cached. Environment
variables and literal values are not cached, so changes are picked up.
Addresses review feedback on #762.
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Co-authored-by: Mario Zechner <badlogicgames@gmail.com>
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