checkpoint

checkpoint is a skill for Claude Code from panayiotism/claude-harness. It costs 58 tokens per session (3,540 once invoked), scanned A, original, MIT.

A command for saving the state of a development session and its decisions. It can prepare changes for version control, remote sharing, review, and later continuation.

In plain words
What is it for?
Use it when pausing work, creating or updating a pull request, preserving project memory, archiving completed features, or recording a session handoff.
Why use it?
It reduces the chance of losing progress, context, decisions, or completed feature information between sessions.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: mentions subagents; mentions Claude Code.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the claude-harness plugin — 6 skills, 1 agent, 8 hooks shipped together

Good fit Use it when pausing work, creating or updating a pull request, preserving project memory, archiving completed features, or recording a session handoff.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code
/plugin marketplace add panayiotism/claude-harness
Claude Code
/plugin install claude-harness

Made for: Claude Code.

Or install claude-harness, the plugin that ships this one along with the rest of its 6 skills, 1 agent, 8 hooks.

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/panayiotism/claude-harness/checkpoint/github.svg)](https://agentmods.dev/skills/panayiotism/claude-harness/checkpoint)
Your own site
<a href="https://agentmods.dev/skills/panayiotism/claude-harness/checkpoint"><img src="https://agentmods.dev/badge/skills/panayiotism/claude-harness/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/panayiotism/claude-harness/checkpoint"><img src="https://agentmods.dev/badge/skills/panayiotism/claude-harness/checkpoint.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 58 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,540 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 $0.00058 $0.03540
Opus 5 $0.00029 $0.01770
Sonnet 5 $0.00012 $0.00708
Haiku 4.5 $0.00006 $0.00354

Measured 9d ago against content hash d33c647d0362, 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 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.

skills/checkpoint/SKILL.md · 337 lines

How it starts

The opening of the file, as written. The whole thing — 337 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Checkpoint - Save Session Progress

Create a checkpoint of the current session: commit, push, PR, memory persistence, and feature archival.

Arguments: $ARGUMENTS

Session ID: ${CLAUDE_SESSION_ID} — session state lives in .claude-harness/sessions/${CLAUDE_SESSION_ID}/.

Phase 0: Set Paths

  1. Set path variables:
    • FEATURES_FILE=".claude-harness/features/active.json"
    • ARCHIVE_FILE=".claude-harness/features/archive.json"
    • MEMORY_DIR=".claude-harness/memory/"
    • PROGRESS_FILE=".claude-harness/claude-progress.json"
    • SESSION_DIR=".claude-harness/sessions/${CLAUDE_SESSION_ID}/"

Phase 1: Update Progress

  1. Update ${PROGRESS_FILE} with:
    • Summary of what was accomplished this session
    • Any blockers encountered
    • Recommended next steps
    • Update lastUpdated timestamp

Phase 1.6: Persist to Memory Layers (OKF bundle)

Memory layers are an OKF v0.1 bundle at ${MEMORY_DIR}: one markdown concept file per entry with YAML frontmatter (required type field), plus an index.md listing per directory. See schemas/okf-memory.md for the format.

1.6. Persist session decisions to ${MEMORY_DIR}/decisions/:

  • For each key decision made during this session:
    • Write a concept file dec-{NNN}-{slug}.md (next NNN from existing files; slug = lowercased decision, non-alphanumerics as hyphens, <=48 chars):
      ---
      type: Decision
      id: dec-{NNN}
      title: "{what was decided, <=80 chars}"
      timestamp: {ISO timestamp}
      feature: {feature-id}
      ---
      
      # {full decision text}
      
      ## Rationale
      {why this decision was made}
      
      ## Alternatives
      - {other options considered}
      
      ## Impact
      {files or areas affected}
      
    • Append * [{id}: {title}](/decisions/{filename}) - {short description} to ${MEMORY_DIR}/decisions/index.md
  • Rolling window: if more than 50 decision concepts exist, delete the oldest files and their index lines (FIFO)
  • Report: "Recorded {N} decisions to episodic memory"

Read the full file on GitHub · 337 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. 9d ago First seen · 337 lines · 58 tokens per session scan A d33c647d0362

Subscribe to this mod's changes

checkpoint is a skill published in the GitHub repository panayiotism/claude-harness (79 stars, last pushed 1mo ago), licensed MIT. It adds 58 tokens to every session and 3,540 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.