What is matter_webcontrol CLAUDE.md?

An agent guide for a Python server that controls Matter smart-home devices, such as lights and sensors, through REST and MCP interfaces. Matter is a standard for connecting smart-home devices from different manufacturers.

Use it when changing device control, thermostat or sensor conversions, authentication, REST endpoints, MCP access, bridges, storage paths, or tests in this project.

It gives the assistant the project's architecture and rules, helping it place changes in the correct layer and preserve the shared business logic and test structure.

How dongnh/matter_webcontrol configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to dongnh/matter_webcontrol. 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/dongnh/matter_webcontrol/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/dongnh/matter_webcontrol

Made for: Claude Code.

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/instructions/dongnh/matter_webcontrol/claude-md/github.svg)](https://agentmods.dev/instructions/dongnh/matter_webcontrol/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/dongnh/matter_webcontrol/claude-md"><img src="https://agentmods.dev/badge/instructions/dongnh/matter_webcontrol/claude-md/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/instructions/dongnh/matter_webcontrol/claude-md"><img src="https://agentmods.dev/badge/instructions/dongnh/matter_webcontrol/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,381 This file is loaded in full into every session.

When invoked 1,381 The same file — it is already loaded in full.

Security scan B 1 finding. 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	$0.01381	$0.01381
Opus 5.5	$0.00552	$0.00552
Sonnet 5.5	$0.00276	$0.00276
Haiku 4.5	$0.00138	$0.00138

Measured 2mo ago against content hash a7464f4650cc, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

matter_webcontrol CLAUDE.md scanned grade B 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.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

# HTTP server — no sudo needed when devices are already on the LAN.

CLAUDE.md · 86 lines

How it starts

The opening of the file, as written. The whole thing — 86 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Matter Web Controller — Agent Guide

What is this?

A Python server for controlling Matter smart home devices (lights, sensors) and external logical bridges via REST API and MCP.

Project structure

cli/
  core.py            — DeviceController: all business logic (single source of truth)
  constants.py       — magic values: Thermostat modes/clusters, sensor keys, mired bounds, extract_matter_pin
  conversions.py     — pure unit math (brightness/mired/kelvin/centi); zero deps
  serializers.py     — pure (device, names) -> dict builders + resolved_names merge
  paths.py           — resolve one data dir + every cache/storage path
  schemas.py         — Pydantic request models (POST bodies)
  auth.py            — constant-time api-key check + non-loopback bind refusal
  server.py          — FastAPI routes only (thin wrappers calling core)
  mcp_server.py      — MCP server (HTTP client calling matter-srv)
  matter_bridge.py   — Matter protocol bridge (WebSocket) + public facade + persistence
  logic_bridge.py    — Logical bridge manager (HTTP federation with remote instances)
tests/               — pytest suite; fakes.py is the single fake source (shared with dev/)

Architecture rules

All business logic lives in cli/core.py — server.py and mcp_server.py are thin wrappers only. Never duplicate logic.
MCP server is an HTTP client — It calls the running matter-srv HTTP server. It does NOT import core.py, matter_bridge.py, or logic_bridge.py.
Device IDs are canonical — Always dev_* format (e.g. dev_a3f7c1b2). Aliases are display-only, never used for ID resolution.
Physical vs logical routing — Commands check logical bridges first, then fall back to physical Matter devices. There is exactly one router (DeviceController._route) and one deduped enumerator (._iter_devices) — route/enumerate through them, don't re-implement the traversal.
Bridge access goes through the facade — core/server never touch bridge._private members; use the public methods on MatterBridgeServer (sync, names_for, add_alias, device_ids_for_node, subscribe_occupancy, …).
Mutations are POST-only with a Pydantic body from cli/schemas.py; secrets go in the body, never the URL.

Read the full file on GitHub · 86 lines

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.

2mo ago First seen · 86 lines · 1,381 tokens per session scan B a7464f4650cc

Subscribe to this mod's changes

matter_webcontrol CLAUDE.md is an instructions file published in the GitHub repository dongnh/matter_webcontrol (0 stars, last pushed 2mo ago), licensed MIT. It adds 1,381 tokens to every session, about $0.0055 per session on Opus 5.5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Backend and APIs Hardware and IoT

matter_webcontrol CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
matter_webcontrol CLAUDE.mddongnh/matter_webcontrol	Instructions file	0	2mo ago	MIT	B	1,381	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

matter_webcontrol: Instructions file for Claude Code