Borrowing it
Nothing to install: this file belongs to shigechika/aruba-central-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/shigechika/aruba-central-mcp/main/.github/copilot-instructions.mdgit clone --depth 1 https://github.com/shigechika/aruba-central-mcpWrote 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/instructions/shigechika/aruba-central-mcp/copilot-instructions)<a href="https://agentmods.dev/instructions/shigechika/aruba-central-mcp/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/shigechika/aruba-central-mcp/copilot-instructions.svg" alt="Measured on agentmods" 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 | $0.02084 | $0.02084 |
| Opus 5 | $0.01042 | $0.01042 |
| Sonnet 5 | $0.00417 | $0.00417 |
| Haiku 4.5 | $0.00208 | $0.00208 |
Grade A, and why
aruba-central-mcp copilot-instructions.md 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 7d 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.
How it starts
The opening of the file, as written. The whole thing — 147 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Repository overview
aruba-central-mcp is an MCP (Model Context Protocol) server exposing Aruba
Central (GreenLake New Central API) data — APs, switches, wireless clients —
to AI assistants over stdio transport. Built on the official mcp Python
SDK's FastMCP (aruba_central_mcp/server.py), with ArubaClient
(aruba_central_mcp/client.py) handling OAuth2 Client Credentials auth,
httpx, and automatic pagination.
See CLAUDE.md for the authoritative command list and architecture notes —
read it before reviewing changes to client.py, server.py, or
__main__.py.
Build & validate
python3 -m venv .venv
.venv/bin/pip install -e ".[test]"
.venv/bin/pytest -v # all tests
.venv/bin/pytest -v tests/test_client.py # client tests only
.venv/bin/pytest -v tests/test_server.py # server tests only
python3 -m py_compile aruba_central_mcp/client.py # syntax check
This mirrors .github/workflows/test.yml (pip install -e ".[test]" +
pytest tests/ -v, matrix over Python 3.10–3.14, plus one Windows job
specifically to catch stdio newline regressions —
see modelcontextprotocol/python-sdk#2433), plus a lint job running
ruff check . at the pinned version. Lint findings are therefore already
enforced and not worth restating; formatting is not gated, so ruff format
nits are still noise.
What to focus review on in this repo
1. This is a stdio MCP server — stdout is a JSON-RPC channel, not a log
Any print() or library logging that writes to stdout (instead of stderr)
corrupts the protocol stream for the connected client. Flag any new code
path that writes to stdout directly, uses a logger without an explicit
stderr handler, or lets a dependency's default logging config leak through.
This exact bug class is why CI runs a dedicated Windows job (stdio newline
handling is platform-sensitive) — treat it as a real, previously-hit failure
mode, not a theoretical one.
2. FastMCP already wraps tool returns — don't ask for manual envelope code
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.
- 7d ago First seen · 147 lines · 2,084 tokens per session scan A 9a136fcae357
aruba-central-mcp copilot-instructions.md is an instructions file published in the GitHub repository shigechika/aruba-central-mcp (0 stars, last pushed 8d ago), licensed MIT. It adds 2,084 tokens to every session, about $0.0104 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 2026-08-31.
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