pub const TOOL_CALL_KEY: &str = "flow:tool_call";Expand description
Written when the governed flow admits a tool call, before it runs:
{"tool": name, "id": call id}. With TOOL_DENIED_KEY and
TOOL_RESULT_KEY it puts every governance decision about a tool in the
mutation journal, in order, which is what makes a recorded session
replayable as a scenario.