Borrowing it
Nothing to install: this file belongs to ProfSynapse/nexus. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/ProfSynapse/nexus/main/CLAUDE.mdgit clone --depth 1 https://github.com/ProfSynapse/nexusWrote 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.
[](https://agentmods.dev/instructions/profsynapse/nexus/claude-md)<a href="https://agentmods.dev/instructions/profsynapse/nexus/claude-md"><img src="https://agentmods.dev/badge/instructions/profsynapse/nexus/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.
<a href="https://agentmods.dev/instructions/profsynapse/nexus/claude-md"><img src="https://agentmods.dev/badge/instructions/profsynapse/nexus/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.01259 | $0.01259 |
| Opus 5.5 | $0.00504 | $0.00504 |
| Sonnet 5.5 | $0.00252 | $0.00252 |
| Haiku 4.5 | $0.00126 | $0.00126 |
Grade A, and why
nexus 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.
How it starts
The opening of the file, as written. The whole thing — 101 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Nexus
Obsidian community plugin (claudesidian-mcp, manifest id nexus) that exposes the
vault to AI agents over MCP. TypeScript, esbuild, Obsidian Plugin API, MCP SDK.
isDesktopOnly: false — this plugin runs on mobile.
Hard rules
- Never top-level import Node built-ins or npm packages with Node deps — mobile
has no
fs/path/stream/events. Top-level imports run before anyPlatform.isDesktopguard. UsedesktopRequire()orawait import()inside a function. - Styles in
styles.css, never inline. NoinnerHTMLwith dynamic content.registerDomEvent, neveraddEventListener. requestUrl(), notfetch().normalizePath()for paths — and note it does not strip.., so confinement needs an explicit guard.- Never hardcode storage roots (
Nexus,.nexus) — resolve from settings. - Tool parameter schemas are documentation, not validation. There is no ajv behind them; guards belong in the service/normalizer layer.
Layout
| Path | Contents |
|---|---|
src/agents/ |
Agents and their tools (apps/ = opt-in app agents) |
src/services/ |
LLM providers, memory, conversations, chat, agent registration |
src/database/ |
Storage adapters, SQLite cache, migrations |
src/ui/, src/components/, src/settings/ |
Chat view, modals, settings tabs |
src/main.ts, src/connector.ts |
Plugin entry point; MCP connector |
docs/plans/ |
Design plans — the format to follow for new ones |
docs/changelog.md |
Release history |
Architecture in five lines
- Agent-Tool pattern. Agents extend
BaseAgentand register tools extendingBaseTool<Params, Result>. Results are{ success, ...data }or{ success: false, error }. - MCP exposes exactly two tools —
getTools(discovery) anduseTools(execution). Every other agent is internal. - Storage is hybrid: sharded JSONL event store is the source of truth, SQLite is a rebuildable cache.
- Services are singletons with constructor injection.
- The AI never gets a destructive delete — it gets
archive, which is reversible. Permanent delete is UI-only.
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 · 101 lines · 1,259 tokens per session scan A b43a1fbbe320
nexus CLAUDE.md is an instructions file published in the GitHub repository ProfSynapse/nexus (158 stars, last pushed 5d ago), licensed MIT. It adds 1,259 tokens to every session, about $0.0050 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.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.