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+---
+name: obsidian-bases
+description: Create and edit Obsidian Bases (.base files) with valid YAML schemas, filters, formulas, properties, summaries, and views. Use for database-like Obsidian views or when the user mentions Bases, .base files, table/card/list views, filters, formulas, or summaries.
+license: MIT
+metadata:
+  copilot-enabled-agents: claude, codex, opencode
+  copilot-builtin-version: "1"
+  copilot-upstream-revision: "a1dc48e68138490d522c04cbf5822214c6eb1202"
+---
+
+# Obsidian Bases
+
+## Workflow
+
+1. Read the existing <code>.base</code> file before editing it.
+2. Define global scope with <code>filters</code>.
+3. Add computed values under <code>formulas</code> only when needed.
+4. Configure property display names and one or more views.
+5. Validate YAML, formula references, quoting, and date/duration operations.
+6. Open or query the Base in Obsidian when the CLI is available.
+
+## Schema
+
+~~~yaml
+filters:
+  and:
+    - 'file.ext == "md"'
+    - 'status != "archived"'
+
+formulas:
+  days_until_due: 'if(due, (date(due) - today()).days, "")'
+
+properties:
+  status:
+    displayName: Status
+  formula.days_until_due:
+    displayName: "Days Until Due"
+
+summaries:
+  mean_rounded: 'values.mean().round(2)'
+
+views:
+  - type: table
+    name: Active
+    limit: 50
+    filters:
+      and:
+        - 'status != "done"'
+    order:
+      - file.name
+      - status
+      - formula.days_until_due
+    groupBy:
+      property: status
+      direction: ASC
+    summaries:
+      formula.days_until_due: Average
+~~~
+
+Views may be <code>table</code>, <code>cards</code>, or <code>list</code>.
+A <code>map</code> view depends on compatible map support.
+
+## Filters and properties
+
+Filters may be a single expression or recursively nested <code>and</code>,
+<code>or</code>, and <code>not</code> objects. Property namespaces are:
+
+- note properties: <code>status</code> or <code>note.status</code>
+- file metadata: <code>file.name</code>, <code>file.path</code>,
+  <code>file.folder</code>, <code>file.ctime</code>, <code>file.mtime</code>,
+  <code>file.tags</code>, <code>file.links</code>, and
+  <code>file.backlinks</code>
+- formulas: <code>formula.days_until_due</code>
+
+Use <code>file.hasTag()</code>, <code>file.hasLink()</code>,
+<code>file.hasProperty()</code>, and <code>file.inFolder()</code> for indexed
+file relationships. The <code>this</code> value refers to the Base itself, the
+embedding note, or the active file depending on where the Base is rendered.
+
+## Formula rules
+
+- Guard optional properties with <code>if()</code>.
+- Date subtraction returns a Duration, not a number. Access
+  <code>.days</code>, <code>.hours</code>, or another numeric field before
+  calling number methods such as <code>.round()</code>.
+- Every <code>formula.X</code> used by a view or property configuration must
+  have a matching <code>X</code> entry under <code>formulas</code>.
+- Wrap formulas containing double quotes in YAML single quotes.
+- Quote YAML strings containing special characters, especially colons and
+  leading punctuation.
+
+Read [Functions reference](references/FUNCTIONS_REFERENCE.md) for function and
+type-specific operations, and [Examples](references/EXAMPLES.md) for complete
+task-tracker and daily-notes Bases.
+
+## Validation checklist
+
+- The document parses as YAML and has a <code>views</code> list.
+- View <code>order</code>, <code>groupBy</code>, and summaries reference defined
+  note, file, or formula properties.
+- Formula quoting is balanced and duration math accesses a numeric field.
+- Embedded view names match exactly: <code>![[My Base.base#View Name]]</code>.
+
+## Attribution
+
+Adapted from <code>kepano/obsidian-skills</code> at revision
+<code>a1dc48e68138490d522c04cbf5822214c6eb1202</code>. See <code>LICENSE</code>.