Notes your agent can navigate without burning its context window.
HermesMarkdown structures your vault so agents know what to read — and what to skip. Plain .md files your AI can query like a database, not brute-force through.
Most Markdown editors are great for writing. They're terrible for agents.
When you drop a vault into Claude Code or Cowork, the agent starts from scratch every time. It has no idea which files are relevant, what they cover, or when to reach for them. It either burns through your context window — or guesses, and pulls the wrong file.
HermesMarkdown fixes this before the agent ever opens a file.
Agents know what to read before they open a single file
HermesMarkdown generates an AGENTS.md index your agent reads first. It defines a three-tier protocol: scan read_when to filter without loading, read scope to confirm relevance, load the full file only when needed. Your context window stays clean. Retrieval stays precise.
Pull up a live readability score on demand from the command palette so you know how well any file is structured — without it cluttering the page while you write.
Your notes, structured on your terms
The four default fields — scope, read_when, related, and tags — are a starting point, not a contract. Drop the ones you don't need, rename them, or skip frontmatter entirely. HermesMarkdown scores heading structure, typed code fences, and table formatting too — a clean plain note still earns a real readability rating.
A wizard walks you through it on new files. Every agent that reads your vault benefits from whatever structure you add — permanently.
Table editor
Click inside any Markdown table for a full toolbar. In the editor dialog, click a cell to select it and double-click (or hit Enter) to type — arrow keys and Tab move between cells. Add rows, sort by date or number, export to CSV. Output is clean, auto-padded Markdown. Insert a starter grid with /table or the {table} shortcode.
You bring your own AI keys
Connect your Anthropic or Google Gemini API key. HermesMarkdown uses it to auto-generate scope fields, suggest related links, and improve your writing — inline, in the editor. Your keys stay in your browser. We never see them or proxy your requests.
Filter the whole vault, not just one file
Open any local directory as a vault and save directly to your machine — no upload required. Filter your entire vault by tag, date, or word count with Smart Workspaces. A built-in Today's Work view shows everything you touched in the last 24 hours. WikiLinks connect notes vault-wide — type [[note name]] and navigate with a click.
Google Drive sync
Opt-in cloud backup. Connect your Google Drive and HermesMarkdown syncs in the background — your vault stays on your machine and works offline first. Disconnect any time, files stay put. It 's an escape hatch, not a dependency.
Vault
Drive
Nothing but the page, until you ask for more
The app opens straight into a full-screen writing surface — no sidebar, no tabs, nothing else. Hover the left edge when you need the file tree, or pin it open. Open files side by side and drag tabs between panes. Elements in the editor are live — click [ ] to toggle tasks, click any date to open a calendar picker, and Ctrl+Click any WikiLink to navigate instantly.
Real formulas & smart syntax
Type =SUM(B2:D2) into any table cell — Excel-style formulas with cell references, ranges, and functions like AVERAGE and IF, computed live right where you're typing. Click cells to build a reference instead of typing it — Excel-style point mode — and currency symbols in referenced cells carry through to the result automatically, no setup needed. Type / for the template menu — Daily Note, Meeting Notes, and more. Shortcodes expand inline: ..d for today's date, calc() for inline expressions.
Own your context. Own your output.
Plain .md files. Structured for agents. Runs in your browser, saves to your machine.