What is checkpointing?

A session-recording and progress-tracking tool that saves checkpoints and keeps a short current state for an agent project.

It helps capture project activity, rebuild a progress summary, and organize logs and checkpoint files.

It prevents important decisions, completed work, and open problems from being lost as a long session grows or gets condensed.

How DeL-TaiseiOzaki/claude-code-orchestra configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to DeL-TaiseiOzaki/claude-code-orchestra. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/DeL-TaiseiOzaki/claude-code-orchestra/main/.claude/skills/checkpointing/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/DeL-TaiseiOzaki/claude-code-orchestra

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/del-taiseiozaki/claude-code-orchestra/checkpointing/github.svg)](https://agentmods.dev/skills/del-taiseiozaki/claude-code-orchestra/checkpointing)

Your own site

<a href="https://agentmods.dev/skills/del-taiseiozaki/claude-code-orchestra/checkpointing"><img src="https://agentmods.dev/badge/skills/del-taiseiozaki/claude-code-orchestra/checkpointing/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/del-taiseiozaki/claude-code-orchestra/checkpointing"><img src="https://agentmods.dev/badge/skills/del-taiseiozaki/claude-code-orchestra/checkpointing.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 26 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,794 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. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

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.

Model	Per session	Once invoked
Fable 5.1	$0.00026	$0.01794
Opus 5	$0.00013	$0.00897
Sonnet 5	$0.00005	$0.00359
Haiku 4.5	$0.00003	$0.00179

Measured 5d ago against content hash 73b647064139, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

checkpointing 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 5d ago.

The scan reads SKILL.md. This mod also ships 2 executable files (checkpoint.py, refresh_guard.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

.claude/skills/checkpointing/SKILL.md · 167 lines

How it starts

The opening of the file, as written. The whole thing — 167 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Checkpointing

Capture durable session context without growing the always-loaded root CLAUDE.md. Canonical state and artifacts live under .claude/.

Owned Paths

.claude/checkpoints/: full timestamped checkpoints; never deleted by the compact phase.
.claude/checkpoints/INDEX.md: generated catalog of every checkpoint.
PROGRESS.md: latest five checkpoint summaries.
.claude/STATE.md: one Progress Tracker link and current working blocks.
.claude/logs/: drafts, previews, work logs, and CLI activity.
.claude/docs/research/: research notes; inactive notes may be archived only after user approval.

Both scripts write nothing without --apply. Every default run produces preview files under .claude/logs/ and leaves PROGRESS.md and .claude/STATE.md untouched.

Full Checkpoint

Determine the time window from the newest checkpoint, or use all available history when none exists.
Gather the user requests and decisions from the current conversation, git changes, CLI logs, team work logs, and relevant design changes.
Write a Japanese five-part summary containing: 何をしたのか, どういうやり取りをユーザーと行ったのか, どうやったのか, 途中でどういう課題が起こったのか, and 将来のアクション. This is the irreducible judgment in the skill and is never generated: a missing, empty, stale, or incomplete summary aborts the run with exit 2.
Save the summary to .claude/logs/pending-summary.md, then preview:
```
python3 .claude/skills/checkpointing/checkpoint.py \
  --summary-file .claude/logs/pending-summary.md
```
Exit 0 reports result: preview and four preview files (checkpoint-preview-*, index-preview-*, progress-preview-*, state-preview-* under .claude/logs/). Exit 1 is a bad --since / --now; exit 2 is a summary or shared-state contract violation; exit 3 is a timestamp collision, a concurrent modification, or a write failure.

Add --label <slug> when the session's commit messages would not name it well; the label becomes the checkpoint's slug in the frontmatter and the index.
Review the four previews, then write for real:

Read the full file on GitHub · 167 lines

Files

What ships with it

3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

5d ago Changed · +1 tokens per session 73b647064139
6d ago Changed · +28 lines 4fa1f00b2a2d
10d ago First seen · 139 lines · 25 tokens per session scan A af08c2b1b6ce

Subscribe to this mod's changes

checkpointing is a skill published in the GitHub repository DeL-TaiseiOzaki/claude-code-orchestra (194 stars, last pushed 6d ago), licensed MIT. It adds 26 tokens to every session and 1,794 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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claude-code-orchestra: Skill for Claude Code