checkpoint

checkpoint is a skill for Claude Code, Codex from adonai-labs/agent-runway. It costs 53 tokens per session (604 once invoked), scanned A, original, MIT.

A compact record of the current state of development work so another person, agent, or later session can continue. It captures what was done, what was checked, and what remains open.

In plain words
What is it for?
Use it before switching tasks, pausing work, handing a task to someone else, or planning how to resume later.
Why use it?
It prevents context and useful investigation details from being lost when work pauses or changes hands.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it before switching tasks, pausing work, handing a task to someone else, or planning how to resume later.

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Install with agentmods
npx agentmods add skills/adonai-labs/agent-runway/checkpoint
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.

Any agent
npx skills add adonai-labs/agent-runway --skill checkpoint
Clone the repo
git clone --depth 1 https://github.com/adonai-labs/agent-runway

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for checkpoint

README.md
[![agentmods](https://agentmods.dev/badge/skills/adonai-labs/agent-runway/checkpoint/github.svg)](https://agentmods.dev/skills/adonai-labs/agent-runway/checkpoint)
Your own site
<a href="https://agentmods.dev/skills/adonai-labs/agent-runway/checkpoint"><img src="https://agentmods.dev/badge/skills/adonai-labs/agent-runway/checkpoint/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.

agentmods 80×15 button for checkpoint

Your own site · 80×15
<a href="https://agentmods.dev/skills/adonai-labs/agent-runway/checkpoint"><img src="https://agentmods.dev/badge/skills/adonai-labs/agent-runway/checkpoint.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 53 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 604 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00053 $0.00604
Opus 5 $0.00026 $0.00302
Sonnet 5 $0.00011 $0.00121
Haiku 4.5 $0.00005 $0.00060

Measured 8d ago against content hash f49575a2f201, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

checkpoint 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 8d 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.

src/core/skills/checkpoint/SKILL.md · 112 lines

How it starts

The opening of the file, as written. The whole thing — 112 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Checkpoint

Invoke Skill

@checkpoint [optional title or mode]

Examples:

  • @checkpoint
  • @checkpoint before refactor
  • @checkpoint handoff

What this skill does

Creates a compact, factual snapshot of the current work state.

Use it when work is paused, switching context, handing off to another agent, or preserving a useful point during rapid iteration.


Workflow

1. Inspect current state

Gather only observable context:

  • current branch and git status, if available
  • recently changed files
  • current task intent
  • completed changes
  • validation already run
  • known risks, blockers, or open questions
  • the most useful next command or file to inspect

Do not invent completed work. If something was not validated, say so.

2. Choose checkpoint mode

Default mode is short.

Use handoff mode when the developer says handoff, handover, resume later, or explicitly asks for another agent/person to continue.

Mode Use when Length
Short Pausing or marking progress About 20-40 lines
Handoff Another session/person must continue Detailed enough to resume safely

3. Write the checkpoint

If filesystem write access is available, create:

.agent-runway/logs/checkpoints/YYYY-MM-DD-HHMM-<slug>.md

Use the local date/time when available. If the task has no clear title, use checkpoint as the slug.

If filesystem writes are not available, return the checkpoint content in chat and say it was not written to disk.

4. Use this template

# Checkpoint: <title>

Date: <local date/time>
Branch: <branch or unknown>
Status: <clean/dirty/unknown>

## Intent

<What the work is trying to accomplish.>

## Current State

<What is true right now. Mention changed files when useful.>

## Changes Made

- <Observed completed change>

## Validation

- <Command/result, or "Not run">

## Open Threads

- <Open question, risk, or blocker>

## Resume From Here

<The next concrete action.>

Read the full file on GitHub · 112 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. 8d ago First seen · 112 lines · 53 tokens per session scan A f49575a2f201

Subscribe to this mod's changes

checkpoint is a skill published in the GitHub repository adonai-labs/agent-runway (2 stars, last pushed 19d ago), licensed MIT. It adds 53 tokens to every session and 604 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 2026-08-31.

Related

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