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 | $0.00024 | $0.01974 |
| Sonnet 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 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.
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.
- 11d ago First seen · 432 lines · 48 tokens per session scan C 5cb6fdca97c8
ports is a skill published in the GitHub repository vinnie357/claude-skills (25 stars, last pushed yesterday), licensed MIT. It adds 48 tokens to every session and 3,948 once invoked, about $0.0002 per session on Opus 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.
Other skills, from other repositories
mem0-oss-to-platform
Plan and then execute a migration of a project from the mem0 open-source / self-hosted SDK (the local Memory class) to the mem0 Platform / hosted / managed SDK (the MemoryClient class). Use this whenever a developer wants to move, switch, or migrate their mem0 usage off OSS/self-hosted to the hosted API — e.g.…
agui-dotnet-protobuf
Use the protobuf wire transport (instead of the default Server-Sent Events) for an AG-UI connection with the AG-UI .NET SDK — a compact binary event stream negotiated via the Accept header. USE FOR: making an AGUIChatClient prefer protobuf by wiring an AGUIEventStreamHandler with ProtobufEventStreamFormatter (then…
azure-mgmt-botservice-dotnet
Azure Resource Manager SDK for Bot Service in .NET. Management plane operations for creating and managing Azure Bot resources, channels (Teams, DirectLine, Slack), and connection settings. Triggers: "Bot Service", "BotResource", "Azure Bot", "DirectLine channel", "Teams channel", "bot management .NET", "create bot".
fastapi-router-py
Create FastAPI routers with CRUD operations, authentication dependencies, and proper response models. Use when building REST API endpoints, creating new routes, implementing CRUD operations, or adding authenticated endpoints in FastAPI applications.
migrate-segw-to-rap
Reverse-engineer a SEGW-built OData V2 service (MPC/DPC/MPCEXT/DPCEXT) into a modern RAP V4 service — tables, CDS views (interface + projection), behavior definitions, draft entities, service definition + binding. Use when asked to "migrate this SEGW service to RAP", "convert OData V2 to V4 RAP", "modernize this…
telnyx-messaging-hosted-curl
Set up hosted SMS numbers, toll-free verification, and RCS messaging. Use when migrating numbers or enabling rich messaging features. This skill provides REST API (curl) examples.