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/johnnichev/selectools/handoffnpx skills add johnnichev/selectools --skill handoffgit clone --depth 1 https://github.com/johnnichev/selectoolsWhat 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 | $0.00023 | $0.00302 |
| Opus 5 | $0.00012 | $0.00151 |
| Sonnet 5 | $0.00005 | $0.00060 |
| Haiku 4.5 | $0.00002 | $0.00030 |
Grade A, and why
handoff 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 Handoff
Auto-fill HANDOFF.md with the current session state so the next session can resume.
Steps
-
Run
git status --shortto find modified/untracked files -
Run
git log --oneline -5to get recent commits -
Run
git branch --show-currentto get current branch -
Run
python3 -m pytest tests/ -x -q --tb=no 2>&1 | tail -1to check test status -
Write
HANDOFF.mdwith:
# Session Handoff
## What I Was Doing
[Summarize from conversation context - what was the user working on?]
## Current State
- Branch: [from git branch]
- Last commit: [from git log]
- Tests passing: [from pytest output]
- Files in progress: [from git status]
## What's Left
1. [Infer from conversation - what hasn't been done yet?]
## Key Decisions Made
- [List decisions from this session that aren't in the code]
## Watch Out For
- [Any gotchas or context that would be lost]
- Tell the user: "HANDOFF.md updated. Run
/clearto start fresh. The next session will read HANDOFF.md automatically."
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 · 42 lines · 23 tokens per session scan A bca0928a6665
handoff is a skill published in the GitHub repository johnnichev/selectools (11 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 23 tokens to every session and 302 once invoked, about $0.0001 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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