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 BagelHole/DevOps-Security-Agent-Skills --skill ssh-configurationgit clone --depth 1 https://github.com/BagelHole/DevOps-Security-Agent-SkillsWrote 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/bagelhole/devops-security-agent-skills/ssh-configuration)<a href="https://agentmods.dev/skills/bagelhole/devops-security-agent-skills/ssh-configuration"><img src="https://agentmods.dev/badge/skills/bagelhole/devops-security-agent-skills/ssh-configuration/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/bagelhole/devops-security-agent-skills/ssh-configuration"><img src="https://agentmods.dev/badge/skills/bagelhole/devops-security-agent-skills/ssh-configuration.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 | $0.00028 | $0.02567 |
| Opus 5 | $0.00014 | $0.01283 |
| Sonnet 5 | $0.00006 | $0.00513 |
| Haiku 4.5 | $0.00003 | $0.00257 |
Grade D, and why
ssh-configuration 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 8d 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.
- Root or sudo access on the server for sshd_config changes 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.
ssh-keygen -t ed25519 -C "[email protected]" -f ~/.ssh/id_ed25519 How it starts
The opening of the file, as written. The whole thing — 309 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SSH Configuration
Secure SSH server and client configuration for production environments, including key management, hardened sshd settings, bastion host architecture, tunneling, and multiplexing.
When to Use
- Setting up secure remote access to Linux or Unix servers
- Hardening SSH daemon configuration to meet compliance requirements
- Configuring bastion / jump hosts for private network access
- Creating SSH tunnels for secure port forwarding
- Managing SSH keys for teams or automated deployments
- Troubleshooting connection, authentication, or performance issues
Prerequisites
- OpenSSH client installed locally (
ssh -Vto verify) - OpenSSH server installed on target (
sshd) - Root or sudo access on the server for sshd_config changes
- Firewall rules allowing TCP port 22 (or custom SSH port)
Key Generation and Management
# Generate an Ed25519 key (recommended -- fast, secure, short)
ssh-keygen -t ed25519 -C "[email protected]" -f ~/.ssh/id_ed25519
# Generate an RSA 4096-bit key (for legacy compatibility)
ssh-keygen -t rsa -b 4096 -C "[email protected]" -f ~/.ssh/id_rsa_legacy
# Generate a key with a custom comment and no passphrase (CI/CD use only)
ssh-keygen -t ed25519 -C "ci-deploy-key" -f ~/.ssh/ci_deploy -N ""
# Copy public key to a remote server
ssh-copy-id -i ~/.ssh/id_ed25519.pub user@server
# Manually append a public key (when ssh-copy-id is unavailable)
cat ~/.ssh/id_ed25519.pub | ssh user@server "mkdir -p ~/.ssh && chmod 700 ~/.ssh && cat >> ~/.ssh/authorized_keys && chmod 600 ~/.ssh/authorized_keys"
# List fingerprints of keys on the agent
ssh-add -l
# Start the SSH agent and add a key
eval "$(ssh-agent -s)"
ssh-add ~/.ssh/id_ed25519
# Add a key with a lifetime (auto-removed after 8 hours)
ssh-add -t 28800 ~/.ssh/id_ed25519
# Remove all keys from the agent
ssh-add -D
# Convert an OpenSSH key to PEM format (for tools that need it)
ssh-keygen -p -m PEM -f ~/.ssh/id_rsa_legacy
# Show the public key fingerprint (SHA256)
ssh-keygen -lf ~/.ssh/id_ed25519.pub
# Rotate a key: generate new, deploy, then revoke old
ssh-keygen -t ed25519 -f ~/.ssh/id_ed25519_new -C "[email protected] rotated $(date +%Y-%m)"
ssh-copy-id -i ~/.ssh/id_ed25519_new.pub user@server
# After verifying the new key works, remove the old public key from authorized_keys on the server
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.
- 8d ago First seen · 309 lines · 28 tokens per session scan D 8b5e11280374
ssh-configuration is a skill published in the GitHub repository BagelHole/DevOps-Security-Agent-Skills (1,084 stars, last pushed 3mo ago), licensed MIT. It adds 28 tokens to every session and 2,567 once invoked, about $0.0001 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 2026-09-03.
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