What is launch-rhino?

A command that starts one managed Rhino session. Rhino is 3D design software, and the router handles the session's process and connection details.

Opening a Rhino session for later MCP tool calls, choosing Rhino 8, WIP, or 9 when supported, and closing the session afterward.

It avoids manually starting Rhino, finding an available port, and reconnecting the agent to it.

launch-rhino — Command for Claude Code by mcneel

Install

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.

Clone the repo

git clone --depth 1 https://github.com/mcneel/RhinoAI

Made for: Claude Code.

Or install rhino-mcp, the plugin that ships this one along with the rest of its 2 skills, 5 commands, 8 agents, 1 MCP server.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/commands/mcneel/rhinoai/launch-rhino/github.svg)](https://agentmods.dev/commands/mcneel/rhinoai/launch-rhino)

Your own site

<a href="https://agentmods.dev/commands/mcneel/rhinoai/launch-rhino"><img src="https://agentmods.dev/badge/commands/mcneel/rhinoai/launch-rhino/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.

Your own site · 80×15

<a href="https://agentmods.dev/commands/mcneel/rhinoai/launch-rhino"><img src="https://agentmods.dev/badge/commands/mcneel/rhinoai/launch-rhino.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 10 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 367 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00010	$0.00367
Opus 5	$0.00005	$0.00183
Sonnet 5	$0.00002	$0.00073
Haiku 4.5	$0.00001	$0.00037

Measured 10d ago against content hash 729d3cfc2e6b, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

launch-rhino scanned grade A with 0 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 10d 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

launch-rhino — 100% identical, 0 lines differ

cc-plugin/commands/launch-rhino.md · 43 lines

What it actually says

Spawn one Rhino managed by the router. The router (rhino-mcp-router.exe, shipped inside the Rhino-MCP-Platform yak) is the single stdio MCP server Claude Code talks to. It owns process lifecycle and port allocation — no port probing, no /mcp reconnect, no bash needed.

Argument

$1 — optional Rhino version (8, WIP, 9). Defaults to whatever the router was configured with at startup (typically 8).

If $1 doesn't match one of the supported versions, ask the user to clarify rather than guess.

Step 1 — spawn

Call:

mcp__plugin_rhino-mcp_rhino__spawn_slot(version="$1")

(Omit version to use the router's default.)

The call returns a ChildRhino object: { slot_id, port, pid, version }. The slot_id is an animal name (armadillo, axolotl, …).

Step 2 — report

Tell the user the slot ID and let them know subsequent tool calls should pass slot="<slot_id>".

Example:

Spawned Rhino 8 as slot armadillo (port 10500). Pass slot="armadillo" on any subsequent rhino-mcp tool call to target it.

Closing the Rhino

When the user is done:

mcp__plugin_rhino-mcp_rhino__close_slot(slot="armadillo")

For N parallel Rhinos, use /launch-rhinos instead — it handles spawn + fan-out + cleanup as one workflow.

Changes

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.

10d ago First seen · 43 lines · 10 tokens per session scan A 729d3cfc2e6b

Subscribe to this mod's changes

launch-rhino is a command published in the GitHub repository mcneel/RhinoAI (291 stars, last pushed today), licensed MIT. It adds 10 tokens to every session and 367 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

agent ai mcp

launch-rhino

Getting it into your agent

Wrote this? Show the measurements

What it costs to keep this loaded

Grade A, and why

Nothing flagged

Copies of this mod

What it actually says

Argument

Step 1 — spawn

Step 2 — report

Closing the Rhino

What this file has done since we first saw it

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