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maxmsp-mcp: Instructions file for Claude Code

CLAUDE.md

maxmsp-mcp CLAUDE.md is an instructions file for Claude Code from ersatzben/maxmsp-mcp. It costs 539 tokens per session, scanned A, original, MIT.

Project instructions for using an MCP server to edit Max/MSP patches, which are visual programs for music and multimedia made from connected objects.

In plain words
What is it for?
Use them when creating or modifying Max/MSP patches, placing objects, connecting components, or setting up math, messages, triggers, dials, and random values.
Why use it?
They prevent common patch-editing mistakes, such as overlapping objects or using the wrong values and object options.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md.

This is ersatzben/maxmsp-mcp's own configuration. It tells Claude Code how to work on maxmsp-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 maxmsp-mcp configures →

not rated 172repo +2 4mo ago A scan 539 tokens original MIT
View source ↗ ersatzben/maxmsp-mcp
Reuse

Borrowing it

Nothing to install: this file belongs to ersatzben/maxmsp-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/ersatzben/maxmsp-mcp/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/ersatzben/maxmsp-mcp

Made for: Claude Code.

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Per session 539 This file is loaded in full into every session.
When invoked 539 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 $0.00539 $0.00539
Opus 5.5 $0.00216 $0.00216
Sonnet 5.5 $0.00108 $0.00108
Haiku 4.5 $0.00054 $0.00054

Measured 2mo ago against content hash 651b36a82b64, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

maxmsp-mcp CLAUDE.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 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.

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.

CLAUDE.md · 40 lines

What it actually says

MaxMSP MCP Server

This project provides MCP tools for programmatic Max/MSP patch manipulation.

Critical Rules

Run /maxmsp skill before creating or modifying patches - it contains all placement rules, object gotchas, and tool usage guidelines that MUST be followed.

Quick Reminders (details in skill)

  • CONSIDER SUBPATCHERS for new functionality!
  • NO OVERLAP: Always call get_avoid_rect_position() before placing objects
  • Message boxes: Use numbers [200, 0, 50] not strings ["200", "0", "50"]
  • Auto-sizing: Objects & comments auto-size; messages fixed 70px; UI objects keep defaults

Required Flags

  • Math/pack/unpack: JSON strips .0 from numbers. Use STRING args to preserve floats: ["0", "127", "0", "25."]. Use ["f", "f", "f"] for unpack. Set int_mode=True to explicitly allow integers. Exception: scale with output range ≤ 2 auto-detects float intent.
  • dial: Use dial with @size attribute instead of live.dial (set use_live_dial=True to bypass)
  • trigger/t: Set trigger_rtl=True - fires right-to-left ([t b f] sends f first)
  • random: Set random_bang=True - numbers set range, bangs trigger output (use [t b] to convert)
  • coll: Always include @embed 1 to persist data on save

MCP Tools

Key tools for object manipulation:

  • get_avoid_rect_position() - Get bounding box before placing
  • add_max_object() - Create object (auto-fits width)
  • recreate_with_args() - Change creation-time args, preserving connections
  • move_object() - Reposition object
  • autofit_existing() - Apply auto-fit to existing object

Architecture

  • server.py - Python FastMCP server with Socket.IO
  • MaxMSP_Agent/max_mcp.js - Main Max-side JavaScript handler
  • MaxMSP_Agent/max_mcp_v8_add_on.js - V8 JavaScript with obj.boxtext access

After code changes: Reload js objects in Max (double-click to open editor, then close) and restart node.script (script stop, script start).

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. 2mo ago First seen · 40 lines · 539 tokens per session scan A 651b36a82b64

Subscribe to this mod's changes

maxmsp-mcp CLAUDE.md is an instructions file published in the GitHub repository ersatzben/maxmsp-mcp (172 stars, last pushed 4mo ago), licensed MIT. It adds 539 tokens to every session, about $0.0022 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 2026-08-30.

Creative and media
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