agentmods.dev

SessionEnd

Session-ending hooks that stop session tracking, save a project checkpoint when planning files exist, and run quick edit-verification and parallel-work checks. A session is one period of work with the coding agent.

In plain words
What is it for?
Use them to record session progress and run quick project checks automatically at the end of an agent session.
Why use it?
Important state or unfinished changes can be overlooked when a session closes. These automatic commands preserve progress and perform final lightweight checks.

Hook

5 11d ago A scan tokens not measured original MIT
View the source file randomittin/heimdall
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add hooks/randomittin/heimdall/session-end
Clone the repo
git clone --depth 1 https://github.com/randomittin/heimdall
Per session not measured What this adds to a session before it is invoked.
When invoked not measured Not applicable: nothing here is loaded into a session.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Security

Grade A, and why

SessionEnd scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the commands this hook runs, not an audit. A hook is shell that executes on your machine at the event it names, which is why every command in it is printed with what was found.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

hooks/hooks.json · 20 lines

How it starts

The opening of the file, as written. The whole thing — 20 lines — stays where its author put it; the contents beside it link to each section on GitHub.

{
  "SessionEnd": [
    {
      "hooks": [
        {
          "type": "command",
          "command": "INPUT=$(cat); PLUGIN=\"${CLAUDE_PLUGIN_ROOT:-$(git rev-parse --show-toplevel 2>/dev/null || pwd)}\"; HP=\"$PLUGIN/bin/heimdall-presence\"; if [ -x \"$HP\" ]; then SID=$(printf '%s' \"$INPUT\" | jq -r '.session_id // empty' 2>/dev/null || true); \"$HP\" keeper-stop --session \"$SID\" >/dev/null 2>&1 || true; fi; exit 0"
        }
      ]
    },
    {
      "hooks": [
        {
          "type": "command",
          "command": "PLUGIN=\"${CLAUDE_PLUGIN_ROOT:-$(git rev-parse --show-toplevel 2>/dev/null || pwd)}\"; export PLUGIN; _hmd_to() { if command -v timeout >/dev/null 2>&1; then timeout 10s \"$@\"; elif command -v gtimeout >/dev/null 2>&1; then gtimeout 10s \"$@\"; else \"$@\"; fi; }; _hmd_to bash -c 'CKPT=\"$PLUGIN/bin/heimdall-checkpoint\"; if [ -x \"$CKPT\" ] && { [ -d .planning ] || [ -f heimdall-state.json ] || [ -f superx-state.json ]; }; then \"$CKPT\" write . >/dev/null 2>&1 || true; fi; \"$PLUGIN/bin/parallelism-tracker\" grade 2>&1 || true; \"$PLUGIN/bin/verify-edits\" --quick 2>&1 || true; if [ ! -f .heimdall-no-autocommit ] && [ ! -f .superx-no-autocommit ] && git rev-parse --git-dir >/dev/null 2>&1 && [ -n \"$(git status --porcelain 2>/dev/null)\" ]; then if [ -x \"$PLUGIN/bin/heimdall-autocommit\" ]; then \"$PLUGIN/bin/heimdall-autocommit\" \"session-end checkpoint\" >/dev/null 2>&1 || true; fi; fi' || true; ( CLEAN=\"$PLUGIN/bin/heimdall-cleanup\"; GC=\"$PLUGIN/bin/heimdall-gc\"; if [ -x \"$CLEAN\" ]; then \"$CLEAN\" --auto --repo \"${CLAUDE_PROJECT_DIR:-.}\" >/dev/null 2>&1; elif [ -x \"$GC\" ]; then \"$GC\" run --quiet >/dev/null 2>&1; else REAP=\"$PLUGIN/bin/heimdall-reap-idle\"; [ -x \"$REAP\" ] && [ -d .git ] && \"$REAP\" --apply >/dev/null 2>&1; fi; if [ -x \"$PLUGIN/bin/heimdall-reel\" ] && { [ -d .planning ] || [ -f heimdall-state.json ] || [ -f superx-state.json ]; }; then \"$PLUGIN/bin/heimdall-reel\" record . --name \"run-$(date +%Y%m%d

Read the full file on GitHub · 20 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 20 lines scan A 4445adb140ab

Subscribe to this mod's changes

SessionEnd is a hook published in the GitHub repository randomittin/heimdall (5 stars, last pushed 11d ago), licensed MIT. Its token cost is not measured: a hook is shell that never enters the context. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Code reviewGit and workflowPlanningai-codinganthropicclaude-codeclaude-pluginclideveloper-tools
Related

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SessionStart

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