Borrowing it
Nothing to install: this file belongs to Chachamaru127/codex-harness. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/Chachamaru127/codex-harness/main/.codex/skills/session/SKILL.mdgit clone --depth 1 https://github.com/Chachamaru127/codex-harnessWrote 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/chachamaru127/codex-harness/session)<a href="https://agentmods.dev/skills/chachamaru127/codex-harness/session"><img src="https://agentmods.dev/badge/skills/chachamaru127/codex-harness/session.svg" alt="Measured on agentmods" 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 | $0.00057 | $0.01484 |
| Opus 5 | $0.00028 | $0.00742 |
| Sonnet 5 | $0.00011 | $0.00297 |
| Haiku 4.5 | $0.00006 | $0.00148 |
Grade A, and why
session 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 6d 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 — 191 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Session Skill (Unified)
Consolidates all session-related functionality into one skill.
Usage
/session # Show available options
/session list # Show active sessions
/session inbox # Check incoming messages
/session broadcast "message" # Send message to all sessions
Subcommands
/session list - List Active Sessions
Shows all active Claude Code sessions in the current project.
📋 Active Sessions
| Session ID | Status | Last Activity |
|------------|--------|---------------|
| abc123 | active | 2 min ago |
| def456 | idle | 15 min ago |
/session inbox - Check Inbox
Checks for incoming messages from other sessions.
📬 Session Inbox
| From | Time | Message |
|------|------|---------|
| abc123 | 5m ago | "Ready for review" |
| def456 | 10m ago | "API implementation done" |
/session broadcast "message" - Broadcast Message
Sends a message to all active sessions.
/session broadcast "Review complete, ready for merge"
Capabilities
| Feature | Description | Reference |
|---|---|---|
| Initialization | Start new session, load context | See ../session-init/SKILL.md |
| Memory | Persist learnings across sessions | See ../session-memory/SKILL.md |
| State Control | Resume/fork session based on flags | See references/session-control.md |
| Communication | Cross-session messaging | See ../session-state/SKILL.md |
メモリ最適化（CC 2.1.38+）
Claude Code 2.1.38 以降、セッション再開時のメモリ使用量が 68% 削減 されました。
長時間セッション管理のベストプラクティス
| ワークロード | 推奨戦略 |
|---|---|
| 通常実装 | 1-2時間ごとに --resume で再開 |
| 大規模リファクタ | 機能単位でセッション分割 → 各セッションで --resume |
| 並列タスク | /work all で並列実行、長時間なら途中で --resume |
| メモリ警告時 | 即座に --resume で再開（以前より高速） |
セッション名の自動生成（CC 2.1.41+）
/rename を引数なしで実行すると、会話コンテキストからセッション名を自動生成します。
長時間セッションや --resume を多用するワークフローでセッションの識別が容易になります。
What ships with it
4 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.
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.
- 6d ago First seen · 191 lines · 57 tokens per session scan A 7ec2e9293718
session is a skill published in the GitHub repository Chachamaru127/codex-harness (2 stars, last pushed 6mo ago), licensed MIT. It adds 57 tokens to every session and 1,484 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.
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