Create executable hook scripts with error handling and register them in settings.json.
npx skills add https://github.com/cowwoc/styler --skill register-hook
Please help me install this Agent Skill. Skill: register-hook Source: https://github.com/cowwoc/styler/tree/main/.claude/skills/register-hook Command: npx skills add https://github.com/cowwoc/styler --skill register-hook
This Skill automates the creation and registration of hook scripts with standardized error handling and proper placement in settings.json, reducing setup mistakes and manual configuration time.
Use the register-hook.sh script to create a hook named "log-bash-commands" with trigger "PreToolUse" and matcher "Bash", and provide the script content as needed. The script would include: #!/bin/bash set -euo pipefail trap 'echo "ERROR in log-bash-commands.sh at line $LINENO: Command failed: $BASH_COMMAND" >&2; exit 1' ERR JSON_INPUT=$(cat) COMMAND=$(echo "$JSON_INPUT" | jq -r '.tool_input.command // empty') echo "[$(date -Iseconds)] $COMMAND" >> /tmp/bash-log.txt
High-intent search queries and answers about installing and using this skill.
Create a bash hook script with mandatory error handling by starting with `#!/bin/bash`, adding `set -euo pipefail` to exit on errors, and implementing an ERR trap that logs the line number and failed command before exiting. This pattern ensures hooks fail safely and provide debugging information when issues occur.
Register a hook in settings.json by specifying the trigger event (SessionStart, UserPromptSubmit, PreToolUse, PostToolUse, or PreCompact), the script path, and a matcher to filter when it runs. Valid matcher syntax targets specific tools; PreToolUse hooks commonly use matchers like 'Bash' to run only for particular tool invocations.
Create a bash script with error handling and executable permissions, add it to settings.json with the correct trigger and matcher configuration, restart Claude to activate the hook, and verify execution by testing the trigger condition. The register-hook.sh script automates these steps and provides test instructions.
Yes, changes to settings.json require a Claude restart to take effect. The hook registration process includes a restart reminder to alert you that the new hook won't execute until you restart.
Hook scripts must be executable and follow bash best practices: use `set -euo pipefail` for strict error handling, include an ERR trap for error reporting, and employ valid matcher syntax when registering. These requirements prevent silent failures and ensure hooks behave predictably across environments.
Yes, the PreToolUse trigger allows hooks to run before a tool executes. You can use tool matchers to filter which tools trigger the hook—for example, a 'Bash' matcher runs your hook only before bash commands, enabling selective tool monitoring or preprocessing.
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