log.sh

#!/usr/bin/env bash
set -euo pipefail

# Mirrors the session to a log to work around Claude Code TUI limitations:
# - inability to see full bash output (the ctrl+o expander is unreliable)
# - inability to see web search results (the TUI shows only the query)
# - inability to copy agent replies (/copy grabs too much; manual select drops formatting)
# - inability to copy user prompts (the TUI adds indent and newline artifacts)

log_file="${CLAUDE_LOG:-/tmp/claude.log}"

input="$(cat)"
get() { jq -r "$1" <<<"$input"; }

event=$(get '.hook_event_name // ""')
tool=$(get '.tool_name // ""')
description=$(get '.tool_input.description // ""')
cwd=$(get '.cwd // ""')
cwd="${cwd/#$HOME/~}"
duration=$(get '.duration_ms // ""')

g=$'\033[32m'
r=$'\033[0m'

header() {
  printf '\n\n\n%s========================= %s %s %s =========================%s\n' \
    "$g" "$1" "$cwd" "$(date '+%Y-%m-%d %H:%M:%S')" "$r"
}

field() {
  if [[ $2 == *$'\n'* ]]; then
    printf '%s# %s:%s\n%s\n' "$g" "$1" "$r" "$2"
  else
    printf '%s# %s:%s %s\n' "$g" "$1" "$r" "$2"
  fi
}

if [ "$event" = "MessageDisplay" ]; then
  msg_buf="/tmp/claude-msg-$(get '.message_id // "unknown"')"
  jq -j '.delta // ""' <<<"$input" >>"$msg_buf"
  if [ "$(get '.final // false')" = "true" ]; then
    { header "$event"; cat "$msg_buf"; printf '\n'; } >>"$log_file"
    rm -f "$msg_buf"
  fi
  exit 0
fi

if [ "$event" = "UserPromptSubmit" ]; then
  { header "$event"; printf '%s\n' "$(get '.prompt // ""')"; } >>"$log_file"
  exit 0
fi

{
  header "$tool"
  [ -n "$description" ] && field "desc" "$description"

  case "$tool" in
    Bash)
      if [ "$event" = "PostToolUseFailure" ]; then
        output=$(get '.error // ""')
      else
        output=$(get 'if (.tool_response | type) == "string" then .tool_response else (.tool_response.stdout // "") end')
      fi
      field "command" "$(get '.tool_input.command // ""')"
      [ "$(get '.is_interrupt // false')" = "true" ] && field "interrupt" "true"
      field "output" "$output"
      ;;
    Read)
      field "file" "$(get '.tool_input.file_path // .tool_response.file.filePath // ""')"
      field "lines" "$(get 'if .tool_response.file then (.tool_response.file | "\(.startLine)-\(.startLine + .numLines - 1) of \(.totalLines)") else "" end')"
      ;;
    WebSearch)
      field "query" "$(get '.tool_input.query // ""')"
      field "summary" "$(get '[.tool_response.results[]? | select(type=="string")] | join("\n\n")')"
      ;;
    Glob)
      field "glob" "$(get '.tool_input.pattern // ""')"
      field "results" "$(get 'if (.tool_response | type) == "string" then .tool_response
                              elif (.tool_response.filenames? != null) then (.tool_response.filenames | join("\n"))
                              else (.tool_response | tostring) end')"
      ;;
    *)
      field "tool_input" "$(get '.tool_input')"
      field "tool_response" "$(get '.tool_response')"
      ;;
  esac

  [ -n "$duration" ] && field "duration" "${duration}ms"
} >>"$log_file"

exit 0

settings.json

{
  "PostToolUse": [
    { "matcher": "Bash|Read|WebSearch|Glob",
      "hooks": [{ "type": "command", "command": "/path/to/log.sh" }] }
  ],
  "PostToolUseFailure": [
    { "matcher": "Bash",
      "hooks": [{ "type": "command", "command": "/path/to/log.sh" }] }
  ],
  "MessageDisplay": [
    { "hooks": [{ "type": "command", "command": "/path/to/log.sh" }] }
  ],
  "UserPromptSubmit": [
    { "hooks": [{ "type": "command", "command": "/path/to/log.sh" }] }
  ]
}