Function evaluate_cursor_post_tool_use

src/hooks/cursor.rs:358–367

Pure decision logic for Cursor `postToolUse` hook events. Returns a soft `additional_context` payload (Cursor's documented `postToolUse` output shape) for exploration tools tracedecay can replace. Invalid or unrelated tool events fail open with no output. Session-level dedupe lives in [`cursor_post_tool_use_decision`]; this stays pure for tests.

(event_json: &str)

/// dedupe lives in [`cursor_post_tool_use_decision`]; this stays pure for
/// tests.
pub fn evaluate_cursor_post_tool_use(event_json: &str) -> Option<String> {
    let parsed: Value = serde_json::from_str(event_json).ok()?;
    let hint = decide_hint(&cursor_tool_hint_input(&parsed))?;
    Some(
        serde_json::json!({
            "additional_context": format_tool_hint(&hint),
        })
        .to_string(),
    )
}

/// Impure `postToolUse` path: [`evaluate_cursor_post_tool_use`] plus
/// per-session hint dedupe persisted under the project's `.tracedecay/` dir.