SkillsLib.ai

Tui Validate

Validate TUI output with semantic LLM-based screenshot testing

4.5(50 reviews)
1,000+ downloads
Updated Oct 2026
Verified SafeSecurity VerifiedThis skill was analyzed by our AI security scanner for harmful content including data exfiltration, system manipulation, credential theft, and prompt injection. No threats were detected.

What You Can Do

You can validate Terminal User Interface applications by capturing their output as high-fidelity screenshots and using Claude as a semantic judge to verify layout, content, and visual hierarchy. Instead of relying on fragile string matching, this skill understands context—checking that UI components render correctly, states display as expected, and visual regression doesn't occur, even when minor formatting changes happen.

Features

Screenshot capture via freeze

generates SVG/PNG snapshots of terminal output with syntax highlighting and styling preserved

Semantic validation with LLM-as-judge

Claude evaluates UI layout, content presence, and visual hierarchy instead of brittle regex matching

Multiple input sources

validate files, live commands, tmux sessions, or raw ANSI text

Built-in validation criteria

predefined checks for common TUI patterns (forms, tables, menus, status displays)

Custom criteria definition

write your own semantic validation rules tailored to your application

Visual regression testing

detect when TUI output changes unexpectedly without breaking on minor formatting

Documentation-ready output

generate validated screenshots suitable for manuals and guides

Structured validation reports

get clear pass/fail results with Claude's reasoning about what succeeded or failed

Example Output

Example 1: Validating a form TUI

Input: command:./my-app --form Criteria: "Form contains all required fields (name, email, submit button) in correct order"

Output:

code
✓ PASS: Form validation successful
  - Name field present and visible
  - Email field present below name
  - Submit button present and accessible
  - Form layout matches expected hierarchy

Example 2: Regression testing a dashboard

Input: tmux:dashboard-session Criteria: "Dashboard displays metrics, status indicators green, and no error messages"

Output:

code
✗ FAIL: Dashboard validation failed
  - Metrics panel present ✓
  - Status indicators present but YELLOW (expected GREEN)
  - No error messages ✓
  Recommendation: Check status indicator logic

What's Included

  • `tui-validate.md` skill instruction file:
  • Template criteria definitions for common TUI patterns (forms, tables, lists, status displays):
  • Example validation prompts for screenshot capture and semantic checking:
  • Freeze configuration snippets for different output formats (SVG, PNG):
  • Troubleshooting checklist for capture and validation failures:

Who It's For

  • DevOps engineers — validating CLI tools and terminal dashboards in CI/CD pipelines
  • Terminal application developers — testing TUI rendering and state changes
  • QA engineers — running visual regression tests on command-line interfaces
  • Documentation writers — capturing and validating TUI screenshots for guides and manuals
  • Systems engineers — verifying monitoring tools and status dashboards display correctly

Best For

  • Visual regression testing for terminal applications without brittle string assertions
  • Semantic validation of CLI tool output, forms, and interactive menus
  • Screenshot capture and validation for technical documentation
  • Verifying TUI state and layout after code changes or configuration updates
  • End-to-end testing of terminal-based dashboards and monitoring tools

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