ClaudeSuperPower
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SessionEnd

Hook
0Other

Fires on

SessionEnd

Once, as the session closes.

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
node "${CLAUDE_PLUGIN_ROOT}/hooks/session-end-cleanup.mjs"

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": {
    "SessionEnd": [
      {
        "hooks": [
          {
            "type": "command",
            "command": "node \"${CLAUDE_PLUGIN_ROOT}/hooks/session-end-cleanup.mjs\""
          }
        ]
      }
    ]
  }
}

Source

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

#!/usr/bin/env node

// hooks/src/session-end-cleanup.mts
import { createHash } from "crypto";
import { readdirSync, readFileSync, rmSync, unlinkSync } from "fs";
import { tmpdir } from "os";
import { join, resolve } from "path";
import { fileURLToPath } from "url";
var SAFE_SESSION_ID_RE = /^[a-zA-Z0-9_-]+$/;
function tempSessionIdSegment(sessionId) {
  if (SAFE_SESSION_ID_RE.test(sessionId)) {
    return sessionId;
  }
  return createHash("sha256").update(sessionId).digest("hex");
}
function removeFileIfPresent(path) {
  try {
    unlinkSync(path);
  } catch {
  }
}
function removeDirIfPresent(path) {
  try {
    rmSync(path, { recursive: true, force: true });
  } catch {
  }
}
function parseSessionEndHookInput(raw) {
  try {
    if (!raw.trim()) return null;
    return JSON.parse(raw);
  } catch {
    return null;
  }
}
function normalizeSessionEndSessionId(input) {
  if (!input) return null;
  const sessionId = input.session_id ?? input.conversation_id ?? "";
  return typeof sessionId === "string" && sessionId.length > 0 ? sessionId : null;
}
function parseSessionIdFromStdin() {
  return normalizeSessionEndSessionId(parseSessionEndHookInput(readFileSync(0, "utf8")));
}
function main() {
  const sessionId = parseSessionIdFromStdin();
  if (sessionId === null) {
    process.exit(0);
  }
  const tempRoot = tmpdir();
  const prefix = `vercel-plugin-${tempSessionIdSegment(sessionId)}-`;
  let entries = [];
  try {
    entries = readdirSync(tempRoot).filter((name) => name.startsWith(prefix));
  } catch {
  }
  for (const entry of entries) {
    const fullPath = join(tempRoot, entry);
    if (entry.endsWith(".d")) {
      removeDirIfPresent(fullPath);
    } else {
      removeFileIfPresent(fullPath);
    }
  }
  process.exit(0);
}
var SESSION_END_CLEANUP_ENTRYPOINT = fileURLToPath(import.meta.url);
var isSessionEndCleanupEntrypoint = process.argv[1] ? resolve(process.argv[1]) === SESSION_END_CLEANUP_ENTRYPOINT : false;
if (isSessionEndCleanupEntrypoint) {
  main();
}
export {
  normalizeSessionEndSessionId,
  parseSessionEndHookInput
};

Shipped by 1 plugin

Installing any of these installs this hook.

vercel232

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