What is helios9-MCP-Server CLAUDE.md?

Development instructions for a TypeScript MCP server called Helios-9. MCP is a way for an AI assistant to call tools exposed by another program, while TypeScript is a programming language with static type checking.

Use them when compiling the server, running it in development or production, cleaning build output, selecting a full or core TypeScript build, and configuring the correct Helios-9 API key.

They document the commands needed to build, develop, start, and clean the server. They also distinguish the two different API-key types used in the Helios-9 system.

How jakedx6/helios9-MCP-Server configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to jakedx6/helios9-MCP-Server. 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/jakedx6/helios9-MCP-Server/master/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/jakedx6/helios9-MCP-Server

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

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Your own site

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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

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Per session 2,654 This file is loaded in full into every session.

When invoked 2,654 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.

Model	Per session	Once invoked
Fable 5.1	$0.02654	$0.02654
Opus 5	$0.01327	$0.01327
Sonnet 5	$0.00531	$0.00531
Haiku 4.5	$0.00265	$0.00265

Measured 9d ago against content hash 0df8a6ffdd30, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

helios9-MCP-Server 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 9d 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 · 288 lines

How it starts

The opening of the file, as written. The whole thing — 288 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Commands

Build and Development

Build: npm run build - Compiles TypeScript to JavaScript in dist/
Development: npm run dev - Runs TypeScript compiler in watch mode
Start: npm start - Runs the compiled server from dist/index.js
Clean: npm run clean - Removes dist/ directory

TypeScript Configuration

Full build: tsc - Uses tsconfig.json (includes all tools)
Core build: tsc -p tsconfig.core.json - Minimal build with only essential tools

CRITICAL: API Key Types - DO NOT CONFUSE

There are TWO completely different types of API keys in the Helios-9 ecosystem:

1. Helios-9 MCP API Keys (Required for MCP Server)

Purpose: Authenticate the MCP server to access user's Helios-9 data
Format: hel9_[32-character-hex] (e.g., hel9_59805140fd5b0a3b25efa9081eb3cf840db7dc70...)
Generated from: Helios-9 app → Settings → API Keys
Used in: HELIOS_API_KEY environment variable
Stored in: mcp_api_keys table (hashed)
Function: Allows MCP server to perform CRUD operations on projects, tasks, documents

2. LLM Provider API Keys (BYOK - Bring Your Own Key)

Purpose: Power AI features like chat, task generation, and future semantic search
Formats:
- OpenAI: sk-...
- Anthropic: sk-ant-...
Generated from: Provider's platform (OpenAI/Anthropic)
Managed in: Helios-9 app → Settings → AI Provider Configuration
Stored in: api_keys table (AES-256-CBC encrypted)
Function: Enables AI-powered features, user pays provider directly

NEVER mix these up - they serve completely different purposes!

Architecture Overview

This is a Model Context Protocol (MCP) server that provides AI agents with structured access to project management functionality. The architecture follows these key principles:

Project Hierarchy Structure

Helios-9 follows a three-level hierarchy for organizing work:

Projects → Top-level containers for related work
Initiatives → Strategic objectives within projects that group related tasks
Tasks → Individual work items that can belong to initiatives

Read the full file on GitHub · 288 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.

9d ago First seen · 288 lines · 2,654 tokens per session scan A 0df8a6ffdd30

Subscribe to this mod's changes

helios9-MCP-Server CLAUDE.md is an instructions file published in the GitHub repository jakedx6/helios9-MCP-Server (2 stars, last pushed 1y ago), licensed MIT. It adds 2,654 tokens to every session, about $0.0133 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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helios9-MCP-Server: Instructions file for Claude Code