Developer Tools / AI SDK / MCP Server

@playbykey/theory

A zero-dependency TypeScript music theory engine with scale, mode, key, and interval utilities, plus MCP server support for AI assistants.

Clear28/30
Useful27/30
Specific15/20
Complete16/20
@playbykey/theory screenshot

Why it was accepted

The page clearly presents a real developer tool with a specific purpose, installation instructions, quickstart examples, exported functions, and direct mention of MCP support for agent use. It has enough evidence for a useful public listing and is relevant to AI builders through the companion MCP server.

Weakness

The snapshot does not show package versioning, release history, repo activity, or broader adoption signals. It also does not show the full API surface beyond the listed functions, so visitors cannot tell how extensive the library is in practice.

Review status

6 days ago #260 ↑ +2

Last evaluated 6 days ago. Current rank #260. Up 2 spots in the rankings.

Score history

86

Related listings

CodeGraph screenshot
94

Developer Tools / AI for Code

CodeGraph is a local code knowledge graph for AI coding agents like Claude Code, Cursor, Codex, OpenCode, and Hermes Agent. It aims to cut token use, tool calls, and runtime by letting agents query pre-indexed code structure instead of scanning files repeatedly.

scribe screenshot
#3 scribe
92

Developer Tools / AI Agents

Single-binary CLI that builds an AI agent knowledge base from git repos, Claude Code/Codex sessions, and saved links. It generates a portable markdown wiki, runs on cron, supports local Ollama mode, and exposes the result for agents via CLAUDE.md/AGENTS.md and MCP.

LLMRender screenshot
92

Developer Tools / React Libraries

A lightweight React Markdown renderer with built-in LaTeX, syntax highlighting, streaming-safe rendering, and security-focused defaults.

Version Sentinel screenshot

Developer Tools / AI Coding Guardrails

Claude Code plugin that blocks dependency edits until a fresh, source-cited version check is recorded, helping prevent hallucinated or stale package versions across npm, pip, Poetry/uv, Cargo, and NuGet.