// harnesses
Harnesses.
A harness is the agent runtime Karta runs your agent on. Declare one in your
karta.toml; Karta resolves it to a
ready runtime when you deploy.
[harness]
type = "claude-code" # one of the ids below
version = "2" # optional - a constraint or exact pin; omit for the defaultClaude Code claude-code
default version 2.1.152 - the version an omitted constraint resolves to
| Version | Status | Capabilities | Auth |
|---|---|---|---|
| 2.1.181 | supported | resume, approvals, file_upload, thinking | api_key, oauth_subscription |
| 2.1.152 | supported | resume, approvals, file_upload, thinking | api_key, oauth_subscription |
OpenCode opencode
default version 1.17.9 - the version an omitted constraint resolves to
| Version | Status | Capabilities | Auth |
|---|---|---|---|
| 1.17.9 | supported | resume | api_key |
Machine-readable: /harnesses.json. The CLI uses it for fast pre-flight feedback; release acceptance is authoritative.