Borrowing it
Nothing to install: this file belongs to albertomarturelo/sii. 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/albertomarturelo/sii/main/.agents/skills/session-start/SKILL.mdgit clone --depth 1 https://github.com/albertomarturelo/siiWrote 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/albertomarturelo/sii/session-start)<a href="https://agentmods.dev/skills/albertomarturelo/sii/session-start"><img src="https://agentmods.dev/badge/skills/albertomarturelo/sii/session-start/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.
<a href="https://agentmods.dev/skills/albertomarturelo/sii/session-start"><img src="https://agentmods.dev/badge/skills/albertomarturelo/sii/session-start.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00058 | $0.00348 |
| Opus 5.5 | $0.00023 | $0.00139 |
| Sonnet 5.5 | $0.00012 | $0.00070 |
| Haiku 4.5 | $0.00006 | $0.00035 |
Grade A, and why
session-start 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 yesterday.
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.
What it actually says
Read the following files in order, then produce a brief summary:
docs/ROADMAP.md— the surface checklist: what is shipped (✅), in progress (🚧), blocked (🔒) and planned (📋).docs/decisions/_index.md— any recent decisions that might affect current work.git log --oneline -10+gh issue list --state open— what actually moved last, and what is still open.
Then state:
- What was being worked on at the last session close.
- What is currently blocked and why.
- What should be the focus of THIS session.
Do NOT read source code files yet. The point of this command is to orient yourself in O(1k) tokens, not O(50k). Source code reading happens after the focus is chosen.
Derive "what was last worked on" from the recent commits and open issues,
not from a status file: docs/CURRENT_STATUS.md is NOT versioned (untracked
since #79) and may be absent or stale. If the last commit is more than a few
days old, say so — the context may have moved on outside this repo.
What ships with it
1 file 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.
- yesterday First seen · 32 lines · 58 tokens per session scan A d728d0798041
session-start is a skill published in the GitHub repository albertomarturelo/sii (16 stars, last pushed yesterday), licensed MIT. It adds 58 tokens to every session and 348 once invoked, about $0.0002 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 2026-10-24.
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