obsidian-bases

name	obsidian-bases
description	Create and edit Obsidian Bases (.base files) — database-like views of notes with filters, formulas, and summaries. Use when working with .base files, creating table/card/list/map views of vault notes, or when the user mentions Bases, database views, filters, or formulas in Obsidian.
model	haiku
allowed-tools	Read, Edit, Write

Obsidian Bases

File Format

Extension: .base — YAML content defining views, filters, and formulas.

Basic Structure

filters:
  and:
    - property: status
      operator: equals
      value: active
    - property: tags
      operator: contains
      value: project

views:
  - type: table
    name: Active Projects
    columns:
      - property: title
      - property: status
      - property: due_date

  - type: cards
    name: Card View
    cover: banner

  - type: list
    name: Simple List

Filter Operators

• equals, not-equals
• contains, not-contains
• greater-than, less-than, greater-than-or-equal, less-than-or-equal
• is-empty, is-not-empty
• starts-with, ends-with
• Combine with and / or

Formulas

formulas:
  days_until_due:
    expression: "dateDiff(today(), prop('due_date'), 'days')"
  is_overdue:
    expression: "prop('due_date') < today()"

View Types

• table — spreadsheet-like with configurable columns
• cards — visual card layout with optional cover image
• list — simple list view
• map — geographic map (requires location property)

Summaries

summaries:
  - property: effort
    function: sum
  - property: status
    function: count-by-value

Properties Reference

Use prop('property_name') in formulas to reference note properties. Property names are case-sensitive and must match frontmatter keys exactly.