What is cos-session-sync?

A session-synchronisation tool that distributes information from the current session into relevant files in a vault, including profiles, projects, decisions, and context.

Use it to update those vault files with information from the current working session.

It reduces the need to copy session details manually into the files used to keep project knowledge.

How will-pagane/chief-of-staff-template configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to will-pagane/chief-of-staff-template. 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/will-pagane/chief-of-staff-template/main/.claude/skills/cos-session-sync/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/will-pagane/chief-of-staff-template

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/will-pagane/chief-of-staff-template/cos-session-sync/github.svg)](https://agentmods.dev/skills/will-pagane/chief-of-staff-template/cos-session-sync)

Your own site

<a href="https://agentmods.dev/skills/will-pagane/chief-of-staff-template/cos-session-sync"><img src="https://agentmods.dev/badge/skills/will-pagane/chief-of-staff-template/cos-session-sync/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/will-pagane/chief-of-staff-template/cos-session-sync"><img src="https://agentmods.dev/badge/skills/will-pagane/chief-of-staff-template/cos-session-sync.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 2,975 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 unknown 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	$0.02975
Opus 5.5	$0.00010	$0.01190
Sonnet 5.5	$0.00005	$0.00595
Haiku 4.5	$0.00003	$0.00298

Measured 2mo ago against content hash a3d6967f0641, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

cos-session-sync 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 2mo 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.

.claude/skills/cos-session-sync/SKILL.md · 255 lines

The source is not reproduced here

No licence file

Read it on GitHub

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.

2mo ago First seen · 255 lines · 26 tokens per session scan A a3d6967f0641

Subscribe to this mod's changes

cos-session-sync is a skill published in the GitHub repository will-pagane/chief-of-staff-template (5 stars, last pushed 2mo ago), with no licence file. It adds 26 tokens to every session and 2,975 once invoked, about $0.0001 per session on Opus 5.5. 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.

Memory and context

cos-session-sync next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
cos-session-syncwill-pagane/chief-of-staff-template	Skill	5	2mo ago	none	A	26	Claude Code
knowledge-ingestopenclaw/openclaw	Skill	394k	yesterday	MIT	A	80	Claude Code, Codex
mem0-oss-to-platformmem0ai/mem0	Skill	68k	2d ago	Apache-2.0	A	217	Claude Code, Codex
forgetasgeirtj/system_prompts_leaks	Skill	71k	2d ago	CC0-1.0	A	74	Claude Code, Codex
Cortexdanielmiessler/LifeOS	Skill	20k	yesterday	MIT	A	184	Claude Code
memoryopensquilla/opensquilla	Skill	7.1k	6d ago	Apache-2.0	A	44	Claude Code, Codex
ha-data-storesshiwenwen/hope-agent	Skill	1.9k	yesterday	MIT	A	115	Claude Code, Codex

chief-of-staff-template: Skill for Claude Code