AgentSkillsCN

is-empty

检查文本是否为空、空或仅包含空白字符

SKILL.md
--- frontmatter
name: is-empty
description: Check if text is null, empty, or only whitespace
type: python
schema_hint:
  target: "$variable or Note ID"
  out: "$variable (optional)"
parameters: none
examples:
  - '{"type":"if","condition":{"type":"tool_condition","tool":"is-empty","target":"$text"},"then":[...]}'

Is Empty

Check whether text contains meaningful content or is effectively empty.

Purpose

  • •Validate note content exists
  • •Enable conditional logic in plans
  • •Filter out empty results
  • •Guard against null/missing data

Input Format

Accepts:

  • •Plain text string
  • •Note content

Parameters

None.

Output Format

Returns boolean:

  • •True if text is null, empty string, or only whitespace
  • •False if text contains any non-whitespace content

Usage Examples

Basic validation:

json
{"type":"is-empty","target":"$result","out":"$is_empty"}

Used in conditional:

json
{"type":"is-empty","target":"$search_results","out":"$no_results"}

Guidelines

  • •Treats null, empty string, whitespace-only as empty
  • •Newlines, tabs, spaces count as whitespace
  • •Any visible character makes content non-empty

Examples

Empty cases:

code
null → true
"" → true
"   " → true
"\n\t  \n" → true

Non-empty cases:

code
"Hello" → false
" x " → false
"0" → false