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.
npx agentmods add skills/puritysb/agentdeck/session-endnpx skills add puritysb/AgentDeck --skill session-endgit clone --depth 1 https://github.com/puritysb/AgentDeckWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00061 | $0.00500 |
| Opus 5 | $0.00030 | $0.00250 |
| Sonnet 5 | $0.00012 | $0.00100 |
| Haiku 4.5 | $0.00006 | $0.00050 |
Grade A, and why
session-end 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 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
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.
What it actually says
Session End
Use this skill at the end of a work session, before /clear, /new, switching tasks, or handing work to another Codex/Claude session.
Purpose
Produce a concise handoff that lets the next session continue without rereading the whole transcript. Separate temporary handoff notes from durable project knowledge.
Workflow
- Read
CLAUDE.mdand the top ofDEVELOPMENT_LOG.md. - Inspect the current work state:
git status --short
git diff --stat
- If files changed, inspect only relevant diffs needed to summarize the work. Do not revert unrelated changes.
- Summarize:
- goal and current outcome
- files changed and why
- verification run and results
- unresolved risks or blockers
- exact next action for the next session
- Update durable docs only when warranted:
DEVELOPMENT_LOG.md: add an entry for meaningful fixes, architectural decisions, hardware findings, or known pitfalls.CLAUDE.md: update only for project-wide architecture, invariants, setup, or workflow changes.AGENTS.md: update only for persistent agent behavior expectations.
- Do not write secrets, credentials, tokens, private device passcodes, or raw prompt transcripts into durable docs.
- If no durable doc update is warranted, say so explicitly in the final handoff.
Handoff Format
Return this shape:
**Session Handoff**
- Goal:
- Current state:
- Changed files:
- Verification:
- Open issues:
- Next action:
- Durable docs updated:
Keep it short enough to paste into a new Codex prompt. Include file paths for changed files, but avoid dumping large diffs.
Notes
- Use Codex
/compactwhen the active thread should continue with a compressed context. - Use
/newor/clearafter the handoff when the next task should start fresh. - Use Codex Memories for personal recurring preferences only; required AgentDeck rules belong in checked-in docs.
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.
- 2d ago First seen · 60 lines · 61 tokens per session scan A d754991aef8e
session-end is a skill published in the GitHub repository puritysb/AgentDeck (212 stars, last pushed 2d ago), licensed MIT. It adds 61 tokens to every session and 500 once invoked, about $0.0003 per session on Opus 5. 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 2026-08-30.
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