diff --git a/claude-code-tracing/hooks/notification.sh b/claude-code-tracing/hooks/notification.sh
index 6daafab..1467b5e 100644
--- a/claude-code-tracing/hooks/notification.sh
+++ b/claude-code-tracing/hooks/notification.sh
@@ -14,6 +14,8 @@ trace_id=$(get_state "current_trace_id")
 session_id=$(get_state "session_id")
 message=$(echo "$input" | jq -r '.message // empty' 2>/dev/null || echo "")
 title=$(echo "$input" | jq -r '.title // empty' 2>/dev/null || echo "")
+message=$(redact_content "$ARIZE_LOG_PROMPTS" "$message")
+title=$(redact_content "$ARIZE_LOG_PROMPTS" "$title")
 notif_type=$(echo "$input" | jq -r '.notification_type // "info"' 2>/dev/null || echo "info")
 
 span_id=$(generate_uuid | tr -d '-' | cut -c1-16)
diff --git a/claude-code-tracing/hooks/permission_request.sh b/claude-code-tracing/hooks/permission_request.sh
index 2c36c99..cc2af72 100644
--- a/claude-code-tracing/hooks/permission_request.sh
+++ b/claude-code-tracing/hooks/permission_request.sh
@@ -16,6 +16,7 @@ trace_id=$(get_state "current_trace_id")
 permission=$(echo "$input" | jq -r '.permission // empty' 2>/dev/null || echo "")
 tool=$(echo "$input" | jq -r '.tool_name // empty' 2>/dev/null || echo "")
 tool_input=$(echo "$input" | jq -c '.tool_input // empty' 2>/dev/null || echo "")
+tool_input=$(redact_content "$ARIZE_LOG_TOOL_DETAILS" "$tool_input")
 
 span_id=$(generate_uuid | tr -d '-' | cut -c1-16)
 ts=$(get_timestamp_ms)
diff --git a/claude-code-tracing/hooks/post_tool_use.sh b/claude-code-tracing/hooks/post_tool_use.sh
index 5247dec..84fb972 100644
--- a/claude-code-tracing/hooks/post_tool_use.sh
+++ b/claude-code-tracing/hooks/post_tool_use.sh
@@ -73,6 +73,15 @@ span_id=$(generate_uuid | tr -d '-' | cut -c1-16)
 
 user_id=$(get_state "user_id")
 
+# Redact content based on logging level
+tool_input=$(redact_content "$ARIZE_LOG_TOOL_CONTENT" "$tool_input")
+tool_response=$(redact_content "$ARIZE_LOG_TOOL_CONTENT" "$tool_response")
+tool_description=$(redact_content "$ARIZE_LOG_TOOL_DETAILS" "$tool_description")
+[[ -n "$tool_command" ]] && tool_command=$(redact_content "$ARIZE_LOG_TOOL_DETAILS" "$tool_command")
+[[ -n "$tool_file_path" ]] && tool_file_path=$(redact_content "$ARIZE_LOG_TOOL_DETAILS" "$tool_file_path")
+[[ -n "$tool_url" ]] && tool_url=$(redact_content "$ARIZE_LOG_TOOL_DETAILS" "$tool_url")
+[[ -n "$tool_query" ]] && tool_query=$(redact_content "$ARIZE_LOG_TOOL_DETAILS" "$tool_query")
+
 # Build base attributes
 attrs=$(jq -n \
   --arg sid "$session_id" --arg tool "$tool_name" \
diff --git a/claude-code-tracing/hooks/stop.sh b/claude-code-tracing/hooks/stop.sh
index cff47ad..4dc45f7 100644
--- a/claude-code-tracing/hooks/stop.sh
+++ b/claude-code-tracing/hooks/stop.sh
@@ -53,6 +53,9 @@ fi
 output=$(printf '%s' "$output" | head -c 5000)
 [[ -z "$output" ]] && output="(No response)"
 
+# Prompt is already redacted at capture time in user_prompt_submit.sh.
+# Model responses are always included — they are the primary value of tracing.
+
 # Compute total token count
 total_tokens=$((in_tokens + out_tokens))
 
diff --git a/claude-code-tracing/hooks/subagent_stop.sh b/claude-code-tracing/hooks/subagent_stop.sh
index f9dbe62..7ae78cc 100644
--- a/claude-code-tracing/hooks/subagent_stop.sh
+++ b/claude-code-tracing/hooks/subagent_stop.sh
@@ -69,6 +69,9 @@ if [[ -n "$transcript_path" && -f "$transcript_path" ]]; then
   subagent_output=$(echo "$subagent_output" | head -c 5000)
 fi
 
+# Redact subagent output unless opted in
+subagent_output=$(redact_content "$ARIZE_LOG_TOOL_CONTENT" "$subagent_output")
+
 # Fall back to current time if no start time found
 [[ -z "$start_time" ]] && start_time="$end_time"
 
diff --git a/claude-code-tracing/hooks/user_prompt_submit.sh b/claude-code-tracing/hooks/user_prompt_submit.sh
index 6046d61..c07d520 100644
--- a/claude-code-tracing/hooks/user_prompt_submit.sh
+++ b/claude-code-tracing/hooks/user_prompt_submit.sh
@@ -46,7 +46,9 @@ inc_state "trace_count"
 set_state "current_trace_id" "$(generate_uuid | tr -d '-')"
 set_state "current_trace_span_id" "$(generate_uuid | tr -d '-' | cut -c1-16)"
 set_state "current_trace_start_time" "$(get_timestamp_ms)"
-set_state "current_trace_prompt" "$(echo "$input" | jq -r '.prompt // empty' 2>/dev/null | head -c 1000)"
+prompt=$(echo "$input" | jq -r '.prompt // empty' 2>/dev/null | head -c 1000)
+prompt=$(redact_content "$ARIZE_LOG_PROMPTS" "$prompt")
+set_state "current_trace_prompt" "$prompt"
 
 # Track transcript position for parsing AI response later
 transcript=$(echo "$input" | jq -r '.transcript_path // empty' 2>/dev/null || echo "")
diff --git a/claude-code-tracing/scripts/setup.sh b/claude-code-tracing/scripts/setup.sh
index 1b40294..4705f56 100644
--- a/claude-code-tracing/scripts/setup.sh
+++ b/claude-code-tracing/scripts/setup.sh
@@ -87,7 +87,8 @@ case "$choice" in
 
   2|arize|ax|AX)
     echo ""
-    read -p "Arize API Key: " api_key
+    read -sp "Arize API Key: " api_key
+    echo ""
     read -p "Arize Space ID: " space_id
 
     if [[ -z "$api_key" || -z "$space_id" ]]; then
@@ -130,6 +131,32 @@ if [[ -n "$user_id" ]]; then
   echo -e "${GREEN}✓${NC} User ID set: $user_id"
 fi
 
+# Content logging levels
+echo ""
+echo -e "${YELLOW}Security:${NC} Traces can contain sensitive data — credentials, PII, file contents."
+echo "Tool details and tool content are redacted by default. Prompts are included"
+echo "by default for debugging visibility. Adjust these settings to match your"
+echo "security requirements."
+echo ""
+
+echo -e "  Log user prompts? [Y/n]: \c"
+read -p "" log_prompts
+echo -e "  Log what tools were asked to do (commands, file paths, URLs)? [y/N]: \c"
+read -p "" log_tool_details
+echo -e "  Log what tools returned (file contents, command output)? [y/N]: \c"
+read -p "" log_tool_content
+
+log_env='{"ARIZE_LOG_PROMPTS": "true"}'
+[[ "$log_prompts" =~ ^[Nn]$ ]] && log_env='{}'
+[[ "$log_tool_details" =~ ^[Yy]$ ]] && log_env=$(echo "$log_env" | jq '. + {"ARIZE_LOG_TOOL_DETAILS": "true"}')
+[[ "$log_tool_content" =~ ^[Yy]$ ]] && log_env=$(echo "$log_env" | jq '. + {"ARIZE_LOG_TOOL_CONTENT": "true"}')
+
+if [[ "$log_env" != "{}" ]]; then
+  ensure_settings_file
+  jq --argjson logging "$log_env" '.env = (.env // {}) + $logging' \
+    "$SETTINGS_FILE" > "${SETTINGS_FILE}.tmp" && mv "${SETTINGS_FILE}.tmp" "$SETTINGS_FILE"
+fi
+
 echo ""
 echo "Configuration saved to $SETTINGS_FILE"
 echo ""
diff --git a/codex-tracing/hooks/notify.sh b/codex-tracing/hooks/notify.sh
index f380b98..eea7ba5 100644
--- a/codex-tracing/hooks/notify.sh
+++ b/codex-tracing/hooks/notify.sh
@@ -87,6 +87,9 @@ fi
 user_prompt=$(printf '%s' "$user_prompt" | head -c 5000)
 assistant_output=$(printf '%s' "$assistant_output" | head -c 5000)
 [[ -z "$assistant_output" ]] && assistant_output="(No response)"
+
+# Redact user prompt unless opted in. Model responses are always included.
+user_prompt=$(redact_content "$ARIZE_LOG_PROMPTS" "$user_prompt")
 debug_dump "${debug_prefix}_text" "$(jq -nc --arg user "$user_prompt" --arg assistant "$assistant_output" '{input:$user,assistant:$assistant}')"
 
 # --- Generate span IDs ---
@@ -338,6 +341,7 @@ if [[ "$event_count" -gt 0 ]]; then
     if [[ -n "$result" && "$result" != "null" ]]; then
       result_time_ns=$(echo "$result" | jq -r '.time_ns // "0"' 2>/dev/null)
       tool_output=$(echo "$result" | jq -r '.attrs.output // .attrs.result // .attrs["tool.output"] // ""' 2>/dev/null | head -c 2000)
+      tool_output=$(redact_content "$ARIZE_LOG_TOOL_CONTENT" "$tool_output")
     fi
 
     # Convert nanosecond timestamps to milliseconds for build_span
diff --git a/core/common.sh b/core/common.sh
index e42f7bc..a706764 100644
--- a/core/common.sh
+++ b/core/common.sh
@@ -25,12 +25,37 @@ ARIZE_VERBOSE="${ARIZE_VERBOSE:-false}"
 ARIZE_TRACE_DEBUG="${ARIZE_TRACE_DEBUG:-false}"
 ARIZE_LOG_FILE="${ARIZE_LOG_FILE:-/tmp/arize-agent-kit.log}"
 
+# --- Content redaction controls ---
+# Prompts, tool arguments, and tool output may contain credentials, PII, or
+# confidential data. These flags control what is included in exported spans.
+# When a flag is off, spans record only content length: <redacted (N chars)>.
+#
+# ARIZE_LOG_PROMPTS:      User prompts (default: on). Model responses are always included.
+# ARIZE_LOG_TOOL_DETAILS: What was requested — bash commands, file paths, URLs, grep patterns (default: off).
+# ARIZE_LOG_TOOL_CONTENT: What was returned — full tool output such as file contents, command output, API responses (default: off).
+ARIZE_LOG_PROMPTS="${ARIZE_LOG_PROMPTS:-true}"
+ARIZE_LOG_TOOL_DETAILS="${ARIZE_LOG_TOOL_DETAILS:-false}"
+ARIZE_LOG_TOOL_CONTENT="${ARIZE_LOG_TOOL_CONTENT:-false}"
+
 # --- Logging ---
 _log_to_file() { [[ -n "$ARIZE_LOG_FILE" ]] && echo "[$(date '+%Y-%m-%d %H:%M:%S')] $*" >> "$ARIZE_LOG_FILE" || true; }
 log() { [[ "$ARIZE_VERBOSE" == "true" ]] && { echo "[arize] $*" >&2; _log_to_file "$*"; } || true; }
 log_always() { echo "[arize] $*" >&2; _log_to_file "$*"; }
 error() { echo "[arize] ERROR: $*" >&2; _log_to_file "ERROR: $*"; }
 
+# --- Content Redaction Helpers ---
+# Returns redacted placeholder with content length, or the original content if logging is enabled.
+# Usage: redact_content "$ARIZE_LOG_PROMPTS" "$content"
+redact_content() {
+  local flag_value="$1" content="$2"
+  if [[ "$flag_value" == "true" ]]; then
+    printf '%s' "$content"
+  else
+    local len=${#content}
+    printf '<redacted (%d chars)>' "$len"
+  fi
+}
+
 # --- Utilities ---
 generate_uuid() {
   uuidgen 2>/dev/null | tr '[:upper:]' '[:lower:]' || \