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BC iptables

iptables and nftables are the Linux kernel packet-filtering tools used to build host firewalls, open or block ports and set up NAT. Use when a user asks to set up a firewall on a Linux server, block or allow a port or IP, restrict SSH, configure masquerade or port forwarding, persist rules across reboots, migrate from iptables to nftables, or fix Docker and ufw conflicts.

TerminalSkills/skills Agent Skills author: TerminalSkills Apache-2.0 2 files body ≈ 1 794 tokens Open the sourcegithub.com↗ analyzed 4 d ago

iptables and nftables are the Linux kernel packet-filtering tools used to build host firewalls, open or block ports and set up NAT.

As a process C 50/100 · Has gaps — weak spots: result and completion, when it triggers, inputs and preconditions

GeneratorDockerInfrastructureWriting and documentstype and topics are labelled automatically from the skill text
Runs in: Claude / Claude Code ChatGPT / Codex Gemini CLI Cursor GitHub Copilot / VS Code Qwen Code Kimi Code CLI Z.ai (GLM) DeepSeek (Deep Code) Mistral Vibe LangChain (deepagents) OpenClaw Goose OpenCode
JSON
Technical rating
B
92/100
safety, quality, tests
Safety 60%
96
Quality 40%
85
Run on models
none yet
Process rating
C
50/100
Has gaps
Result and completion w 14
0
Inputs and preconditions w 11
0
When it triggers w 12
20
the three weakest of ten parameters · all ten

How to improve

    For the model run — optional
    • Your own cases (evals/evals.json, 4–6 real requests with expected answers): the full check would then run those instead of a model-drafted suite.
    • A spec.yaml with trigger phrases and assertions — a behaviour contract for CI; `skilltest init` writes a template.

    Guard findings · 4

    ✓ No critical or high findings

    Medium and low: 4
    • low Dangerous commands cmd-background-process SKILL.md:76
      Starts a background / autostarted process (documentation of a security skill)
      sudo systemctl enable --now nftables     # Debian/Ubuntu: loads /etc/nftables.conf at boot
      security skill
    • low Dangerous commands cmd-privilege SKILL.md:148
      Privilege escalation / world-writable permissions (documentation of a security skill)
      echo 'net.…ard=1' | sudo tee /etc/sysctl.d/90-f…onf
      security skill

    A further 2 matches are quotations in this security skill's documentation and are not counted as findings.

    Files scanned: 2. Evidence is masked. Grey chips explain why severity was lowered.

    Against the Agent Skills spec

    • note edit-residue the text marks something as outdated (lines 6, 102): check that old rules are not kept next to new ones — the full check reads the text for contradictions

    Process rating: all ten parameters 50/100

    • 0Result and completion. Does not say what the result is
    • 0Inputs and preconditions. Does not say what the process needs to start
    • 20When it triggers. No condition that starts the skill
    • 30Running it twice. 16 mutating operations with no state check
    • 50Failures and branches. 0 branches, has a failure section
    • 60Tools and files. Uses tools (bash) that frontmatter does not declare
    • 100Steps. 7 steps
    • 100Consistency. Name and required fields are in place
    • 100Execution cost. Instruction body is 1794 tokens
    • 100Progress reporting. Reports progress

    Everything here is measured from the skill text rather than judged by a model, so the numbers are checkable. A parameter weighs more when it is a more common reason for the process to stall.

    Quality signals

    • +5Description has no quoted example phrases that should trigger the skill
    • +4Description does not say when NOT to use the skill (false activations)
    • +3Output format is not stated: the model decides each time
    • +2Single-language instructions
    • +3Description length 374: enough signal without eating the budget
    • +4Structure: 12 headings
    • +3Step-by-step instructions: 7 items
    • +4Has examples (9 code blocks)
    • +1License stated

    Quality base 70; lint remarks subtract, signals add up to 100. Result: 85.