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 vinnie357/claude-skills --skill portsgit clone --depth 1 https://github.com/vinnie357/claude-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/vinnie357/claude-skills/ports)<a href="https://agentmods.dev/skills/vinnie357/claude-skills/ports"><img src="https://agentmods.dev/badge/skills/vinnie357/claude-skills/ports/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/vinnie357/claude-skills/ports"><img src="https://agentmods.dev/badge/skills/vinnie357/claude-skills/ports.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 | $0.00048 | $0.03948 |
| Opus 5.5 | $0.00019 | $0.01579 |
| Sonnet 5.5 | $0.00010 | $0.00790 |
| Haiku 4.5 | $0.00005 | $0.00395 |
Grade C, and why
ports scanned grade C with 1 finding 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.
Recursive force deletehighDestructive command
rm -rf with a variable or a broad path is one typo away from removing the wrong tree.
user_input = "file.txt; rm -rf /" How it starts
The opening of the file, as written. The whole thing — 432 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Elixir Ports
Ports are Elixir's mechanism for communicating with external OS programs via stdin/stdout. A Port is not a network port — it is a process-like entity that manages an external OS program, forwarding messages as bytes and delivering responses back to the owning Elixir process.
Port Fundamentals
Open a port with Port.open/2. The most common name forms are {:spawn, command} and {:spawn_executable, path}.
# Spawn by shell command string (uses shell, PATH lookups apply)
port = Port.open({:spawn, "cat"}, [:binary])
# Spawn executable directly (no shell, preferred for security)
port = Port.open({:spawn_executable, "/usr/bin/python3"}, [
:binary,
args: ["-u", "my_script.py"]
])
Send data to the port and receive from it:
# Send bytes to the external process's stdin
Port.command(port, "hello\n")
# Receive response — messages arrive in the process mailbox
receive do
{^port, {:data, data}} ->
IO.puts("Got: #{data}")
end
Close the port explicitly or let it close when the owner process exits:
Port.close(port)
# The port will reply {port, :closed} after the external process exits
Port Options Reference
| Option | Description |
|---|---|
:binary |
Deliver data as binaries (recommended; default is charlists) |
{:packet, N} |
Prefix each message with N-byte length header (N = 1, 2, or 4) |
{:line, L} |
Deliver complete lines up to L bytes; partial lines flagged |
:stream |
No framing — raw bytes delivered as received (default) |
:exit_status |
Send {port, {:exit_status, code}} when the program exits |
:use_stdio |
Use stdin/stdout for communication (default) |
:stderr_to_stdout |
Merge stderr into stdout stream |
{:cd, dir} |
Set working directory for the external process |
{:env, env_list} |
EXTENDS the spawned process's environment (does NOT replace it) |
{:args, arg_list} |
Argument list when using :spawn_executable |
{:arg0, string} |
Override argv[0] for the external process |
:parallelism |
Hint to scheduler for improved throughput |
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.
- 2mo ago First seen · 432 lines · 48 tokens per session scan C 5cb6fdca97c8
ports is a skill published in the GitHub repository vinnie357/claude-skills (27 stars, last pushed 14d ago), licensed MIT. It adds 48 tokens to every session and 3,948 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it C with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
ports compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| portsvinnie357/claude-skills | Skill | 27 | 14d ago | MIT | C | 48 | Claude Code |
| mem0-oss-to-platformmem0ai/mem0 | Skill | 69k | 3d ago | Apache-2.0 | A | 217 | Claude Code, Codex |
| azure-mgmt-botservice-dotnetmicrosoft/skills | Skill | 3.2k | today | MIT | A | 78 | Claude Code |
| fastapi-router-pymicrosoft/skills | Skill | 3.2k | today | MIT | A | 46 | Claude Code |
| api-designericrisco/rsc-harness | Skill | 573 | today | MIT | A | 105 | Claude Code, Codex |
| migrate-segw-to-raparc-mcp/arc-1 | Skill | 254 | today | MIT | A | 106 | Claude Code |
| telnyx-messaging-hosted-curlteam-telnyx/ai | Skill | 225 | today | MIT | A | 45 | Claude Code |