Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add yale-som-hpc/claude-code-marketplace --skill connecting-securelygit clone --depth 1 https://github.com/yale-som-hpc/claude-code-marketplaceWrote 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/yale-som-hpc/claude-code-marketplace/connecting-securely)<a href="https://agentmods.dev/skills/yale-som-hpc/claude-code-marketplace/connecting-securely"><img src="https://agentmods.dev/badge/skills/yale-som-hpc/claude-code-marketplace/connecting-securely/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/yale-som-hpc/claude-code-marketplace/connecting-securely"><img src="https://agentmods.dev/badge/skills/yale-som-hpc/claude-code-marketplace/connecting-securely.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 | $0.00080 | $0.01280 |
| Opus 5 | $0.00040 | $0.00640 |
| Sonnet 5 | $0.00016 | $0.00256 |
| Haiku 4.5 | $0.00008 | $0.00128 |
Grade D, and why
connecting-securely scanned grade D with 2 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 11d 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.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
chmod 700 ~/.ssh Reaches for credential fileshighPrivilege escalation
SSH keys, cloud credentials, git-credentials, .npmrc, /etc/shadow: reading these is how a config file becomes a credential leak.
scp ~/.ssh/id_ed25519 hpc:~/.ssh/ How it starts
The opening of the file, as written. The whole thing — 141 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Connecting Securely
Rule: use SSH keys and agent forwarding; never copy private keys onto the cluster.
Do not copy private keys
Bad:
scp ~/.ssh/id_ed25519 hpc:~/.ssh/
Good:
ssh-add -l
ssh hpc
If you need GitHub from the cluster, use gh auth login or carefully scoped SSH agent forwarding. Do not store your laptop private key on GPFS. If gh is not installed, see installing software.
Local SSH config
Example ~/.ssh/config on your laptop:
Host hpc
HostName hpc.som.yale.edu
User yournetid
ServerAliveInterval 60
ServerAliveCountMax 3
ControlMaster auto
ControlPath ~/.ssh/cm-%r@%h:%p
ControlPersist 10m
Host b??? c???
User yournetid
ProxyJump hpc
HostName %h.cm.cluster
ServerAliveInterval keeps NAT/firewalls from silently dropping an idle session; ControlMaster/ControlPersist reuse one warm connection across repeated logins. To keep long agent work alive across laptop sleep or wifi drops, see staying connected.
Enable ForwardAgent yes only if you need it for Git or another SSH hop. Agent forwarding is convenient, but any process you run on the remote host can ask your agent to sign while the connection is active.
Now login works:
ssh hpc
Only connect to a compute node after Slurm has allocated it to you. Use the hostname printed inside your allocation, then tunnel to that node.
Permissions
chmod 700 ~/.ssh
chmod 600 ~/.ssh/config
chmod 600 ~/.ssh/authorized_keys 2>/dev/null || true
chmod 700 ~
This is a shared system. Keep private files private: do not make your home directory, .ssh, .env, tokens, or project credentials group/world-readable.
SSH agent checks
ssh-add -l
ssh -T [email protected]
Inside tmux or a long-running shell, SSH_AUTH_SOCK can go stale. The value is only a path to the forwarded agent socket created by your current SSH login; it is not the key itself. If GitHub auth worked yesterday and fails today, do not copy keys to the cluster. Start a fresh SSH login, restart the shell, or look into refreshing SSH_AUTH_SOCK so it points at a current working socket owned by you.
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.
- 11d ago First seen · 141 lines · 80 tokens per session scan D a46766d564b0
connecting-securely is a skill published in the GitHub repository yale-som-hpc/claude-code-marketplace (5 stars, last pushed 2mo ago), licensed Unlicense. It adds 80 tokens to every session and 1,280 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it D with 2 findings (asks for root, reaches for credential files). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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