streamfog-mcp: Cursor rule for Cursor

.cursorrules

cursorrules is a cursor rule for Cursor from sandraschi/streamfog-mcp. It costs 269 tokens per session, scanned A, original, MIT.

Coding rules for Streamfog MCP, a bridge that lets tools control augmented-reality effects, face filters, and virtual avatars in a live OBS broadcast.

In plain words
What is it for?
Checking bridge health, listing or changing stream lenses, clearing effects, toggling an avatar, and developing the related Python and React code.
Why use it?
They document the required checks and project conventions so changes do not target the wrong effect, break the bridge, or expose environment secrets.

Cursor rule for Cursor

Written for Cursor: installed under .cursor/. Also seen: mentions Cursor.

This is sandraschi/streamfog-mcp's own configuration. It tells Cursor how to work on streamfog-mcp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything streamfog-mcp configures →

Reuse

Borrowing it

Nothing to install: this file belongs to sandraschi/streamfog-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.

Copy the file
curl -O https://raw.githubusercontent.com/sandraschi/streamfog-mcp/master/.cursorrules
Clone the repo
git clone --depth 1 https://github.com/sandraschi/streamfog-mcp

Made for: Cursor.

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.

agentmods badge for cursorrules

README.md
[![agentmods](https://agentmods.dev/badge/rules/sandraschi/streamfog-mcp/cursorrules/github.svg)](https://agentmods.dev/rules/sandraschi/streamfog-mcp/cursorrules)
Your own site
<a href="https://agentmods.dev/rules/sandraschi/streamfog-mcp/cursorrules"><img src="https://agentmods.dev/badge/rules/sandraschi/streamfog-mcp/cursorrules/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.

agentmods 80×15 button for cursorrules

Your own site · 80×15
<a href="https://agentmods.dev/rules/sandraschi/streamfog-mcp/cursorrules"><img src="https://agentmods.dev/badge/rules/sandraschi/streamfog-mcp/cursorrules.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 269 This file is loaded in full into every session.
When invoked 269 The same file — it is already loaded in full.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00269 $0.00269
Opus 5.5 $0.00108 $0.00108
Sonnet 5.5 $0.00054 $0.00054
Haiku 4.5 $0.00027 $0.00027

Measured 1mo ago against content hash 9417ce1f080c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

cursorrules 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 1mo 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:

.cursorrules · 26 lines

What it actually says

Streamfog MCP - Cursor rules

Session Context (Streamfog MCP)

You can control Streamfog AR lenses, face filters, and Vtuber avatars on the live OBS stream via the Streamer.bot bridge (5 MCP tools: streamfog_status, streamfog_set_lens, streamfog_clear_effects, streamfog_toggle_avatar, streamfog_list_lenses).

Before starting work:

  1. Check bridge health: streamfog_status()
  2. List available lenses: streamfog_list_lenses()

At end of work, save state:

  • Confirm the last dispatched action resolved to the intended lens or effect
  • If lenses.json was edited, reload with streamfog_list_lenses(reload=True)

Coding rules

  • Python: ruff (line-length 120), type hints on all public functions
  • FastMCP tools live in src/streamfog_mcp/tools/; register via @mcp.tool()
  • REST endpoints live in src/streamfog_mcp/server.py (FastAPI gateway)
  • Ports: backend 10994, frontend 10995 (fleet registry - never change)
  • Frontend: React + Vite + Tailwind + Zustand; run biome check src/
  • Never bundle .env into builds - only .env.example
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.

  1. 1mo ago First seen · 26 lines · 269 tokens per session scan A 9417ce1f080c

Subscribe to this mod's changes

cursorrules is a cursor rule published in the GitHub repository sandraschi/streamfog-mcp (2 stars, last pushed 2d ago), licensed MIT. It adds 269 tokens to every session, about $0.0011 per session on Opus 5.5. 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.