pub const TOOL_RESULT_NOT_STARTED_METADATA_KEY: &str = "agentkit.tool.not_started";Expand description
Marks a synthetic error result whose tool never began executing (failed
lookup, proposed-request error, or permission-checker denial). Distinct
from TOOL_RESULT_FAILURE_KIND_METADATA_KEY: a tool can fail with a
permission denial mid-execution, in which case it did start.