nexus

A command-line tool for reading, searching, and editing an Obsidian vault, which is a folder of linked notes stored as files.

In plain words
What is it for?
Use it to find and read notes, manage folders and tasks, work with canvases or saved prompts, and update your personal knowledge base.
Why use it?
It helps you work with notes and other vault content from the shell without manually opening Obsidian or guessing which file a search result refers to.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/profsynapse/nexus/skill
Any agent
npx skills add ProfSynapse/nexus --skill skill
Clone the repo
git clone --depth 1 https://github.com/ProfSynapse/nexus

Made for: Claude Code, Codex.

Per session 112 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,135 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00112 $0.01135
Opus 5 $0.00056 $0.00567
Sonnet 5 $0.00022 $0.00227
Haiku 4.5 $0.00011 $0.00113

Measured 2d ago against content hash 7c110bc3e222, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

nexus 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 2d 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.

skill/SKILL.md · 91 lines

How it starts

The opening of the file, as written. The whole thing — 91 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Nexus vault CLI

nexus drives a running Nexus (Obsidian) vault from the shell over a local socket — no MCP config. It has two verbs: discover what you can do, then execute.

Start here

Run nexus --help first. It is the authoritative, always-current manual — commands, the context contract, CLI syntax, gotchas, and the tool catalog. It's offline and instant (no socket), so read it before your first real command instead of guessing.

For a common task, nexus playbook <name> gives you a ready-to-run recipe plus your workspaces and the exact tools it needs, in one call. Run nexus playbook to see what's available (typically: vault-work, organize, tasks, prompt).

The mindset (this is what --help can't teach you)

  • Explore → inspect → exploit. Search/list find locations; content read gets contents; then you write. A search hit is a {path, score}, not the note — never quote, summarize, or edit from a hit without reading it first.
  • nexus tools returns schemas, not data. It's discovery. Don't loop it hoping for vault content — that comes from nexus use --memory … --goal … -- content read ….
  • --memory and --goal are real and enforced. You're operating a person's live vault; pass a genuine running summary and objective, not placeholders.
  • You can't escape the vault. Paths are vault-relative; .., ~, and absolute paths are rejected. That's a guardrail, not a bug.
  • Nothing is destroyed. The AI gets archive (reversible), not delete.
  • Windows: nexus vaults discovers local named pipes. If policy blocks enumeration, pass --vault <name> or set NEXUS_VAULT.

The shape

nexus tools [selector]              # discover — tool schemas (never vault data)
nexus use --memory "<what you're doing>" --goal "<objective>" -- \
    <agent command --flags>         # execute — runs one tool, prints the result

The -- delimiter is canonical: context belongs before it; the tool command belongs after it. This avoids nested command-string quoting, especially in Windows PowerShell. The legacy one-string form remains supported.

Read the full file on GitHub · 91 lines

Files

What ships with it

5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 2d ago First seen · 91 lines · 112 tokens per session scan A 7c110bc3e222

Subscribe to this mod's changes

nexus is a skill published in the GitHub repository ProfSynapse/nexus (154 stars, last pushed 2d ago), licensed MIT. It adds 112 tokens to every session and 1,135 once invoked, about $0.0006 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 2026-08-30.

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