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 skills add vergil-project/vergil-claude-plugin --skill handoffgit clone --depth 1 https://github.com/vergil-project/vergil-claude-pluginWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/vergil-project/vergil-claude-plugin/handoff)<a href="https://agentmods.dev/skills/vergil-project/vergil-claude-plugin/handoff"><img src="https://agentmods.dev/badge/skills/vergil-project/vergil-claude-plugin/handoff/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/vergil-project/vergil-claude-plugin/handoff"><img src="https://agentmods.dev/badge/skills/vergil-project/vergil-claude-plugin/handoff.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What 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 5.1 | $0.00081 | $0.01015 |
| Opus 5 | $0.00041 | $0.00508 |
| Sonnet 5 | $0.00016 | $0.00203 |
| Haiku 4.5 | $0.00008 | $0.00102 |
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 9d 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.
How it starts
The opening of the file, as written. The whole thing — 130 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Handoff
Overview
Standardize session-to-session continuity when an agent must restart mid-work (plugin updates, context limits, crashes). Replaces ad-hoc memory files with a disciplined, template-driven handoff protocol.
Not the PR handoff. This is session-continuity state, distinct from the
.vergil/pr-template.ymlPR handoff used by theimplement/auditpair.
Two modes:
/handoff stop— Capture current work state before killing the session./handoff start— Resume from the last handoff file after restarting.
Memory policy exemption. This skill writes to the memory directory
as part of its documented workflow. Because the human invokes /handoff
explicitly, the write has implicit approval and is exempt from the
global memory management policy's approval requirement.
Mode: stop
Write a structured handoff file to the project memory directory:
<memory-dir>/handoff_active.md
Template
The agent fills in the template from conversation context. The agent writes the content — this skill provides the structure.
---
name: active handoff
description: Session handoff — <one-line summary of in-progress work>
type: project
---
## In-progress task
<What the agent was doing when stop was called. Phase, step, branch name,
PR numbers — enough to resume without re-deriving.>
## Completed this session
<Bulleted list of completed items with PR/issue URLs.>
## Remaining work queue
<Numbered list in execution order. Each item is one sentence.>
## Key context
<Anything non-obvious that the next session needs to know: workarounds in
effect, known failures, blocked items, environment state.>
## Restart command
<The exact slash command or instruction to resume.>
Behavior
- Fill in the template from conversation context.
- Write the file to
<memory-dir>/handoff_active.md. - Add a pointer to
MEMORY.md(or update the existing pointer):- [Active handoff](handoff_active.md) — <one-line summary>. - Confirm the handoff file was written and tell the user it is safe to kill the session.
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.
- 9d ago First seen · 130 lines · 81 tokens per session scan A dac92f872fa2
handoff is a skill published in the GitHub repository vergil-project/vergil-claude-plugin (2 stars, last pushed 7d ago), licensed MIT. It adds 81 tokens to every session and 1,015 once invoked, about $0.0004 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 2026-08-31.
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