ClaudeSuperPower
SubmitLog in
P

PostToolUse (Edit|Write)

Hook
0Other

Fires on

PostToolUsematchingEdit|Write

Immediately after a tool returns, with its result available.

Where this sits in a session

  1. Session start→
  2. Prompt submitted→
  3. Prompt expansion→
  4. Before tool use→
  5. After tool use→
  6. Notification→
  7. Before compaction→
  8. Subagent finished→
  9. Turn finished→
  10. Session end

Observes only — Emits messages or context. It never returns a permission decision.

What it runs

Executed automatically when the event fires — no prompt, no confirmation.

command· timeout 120s
bash "${CLAUDE_PLUGIN_ROOT}/scripts/validate-template.sh"

Install it yourself

Paste into .claude/settings.json to run this hook without installing the whole plugin. Adjust the paths to point at your own copy of the scripts.

settings.json
{
  "hooks": {
    "PostToolUse": [
      {
        "hooks": [
          {
            "type": "command",
            "command": "bash \"${CLAUDE_PLUGIN_ROOT}/scripts/validate-template.sh\"",
            "timeout": 120
          }
        ],
        "matcher": "Edit|Write"
      }
    ]
  }
}

Source

Read this before installing — it runs on your machine with your permissions.

#!/bin/bash
# Validates SAM templates after editing template.yaml or template.yml.
# Runs as a PostToolUse hook on Edit/Write operations.

set -euo pipefail

# Skip if jq is not installed
if ! command -v jq &> /dev/null; then
  echo '{"systemMessage": "jq not found — SAM template validation skipped. Install jq for automatic validation."}'
  exit 0
fi

INPUT=$(cat)

FILE_PATH=$(echo "$INPUT" | jq -r '.tool_input.file_path // empty')

# Only validate SAM template files
case "$FILE_PATH" in
  *template.yaml|*template.yml) ;;
  *) exit 0 ;;
esac

# Skip if SAM CLI is not installed
if ! command -v sam &> /dev/null; then
  echo '{"systemMessage": "SAM CLI not found — template validation skipped. Install SAM CLI for automatic validation."}'
  exit 0
fi

# Skip if file doesn't exist (deleted)
if [ ! -f "$FILE_PATH" ]; then
  exit 0
fi

OUTPUT=$(sam validate --template "$FILE_PATH" --lint 2>&1) && STATUS=0 || STATUS=$?

if [ $STATUS -eq 0 ]; then
  echo '{"systemMessage": "SAM template validation and linting passed."}'
else
  FORMATTED=$(echo "$OUTPUT" | jq -Rs '{systemMessage: ("SAM template validation/linting failed:\n" + .)}' 2>/dev/null) || \
    FORMATTED="{\"systemMessage\": \"SAM template validation/linting failed:\\n$OUTPUT\"}"
  echo "$FORMATTED"
fi

exit 0

Shipped by 1 plugin

Installing any of these installs this hook.

aws-serverless844

Reviews

Log in to leave a review.

No reviews yet — be the first.

Explore related

Other things in this space — across every part of the ecosystem, not just hooks.