cli-patterns

Patterns for building production-quality CLI tools with predictable behavior, parseable output, and agentic workflows. Triggers: cli tool, command line tool, build cli, cli patterns, agentic cli, cli design, typer cli, click cli.

1.64x

Quality

72%

Does it follow best practices?

Impact

94%

1.64x

Average score across 3 eval scenarios

Securityby

Passed

No known issues

Optimize this skill with Tessl

npx tessl skill review --optimize ./data/skills-md/0xdarkmatter/claude-mods/cli-patterns/SKILL.md

Evaluation results

94%

57%

Local Contact Manager CLI

Stream separation and JSON output schema

Criteria

Without context

With context

stdout data only

100%

Rich stderr

100%

JSON list schema

40%

100%

JSON single-item schema

62%

100%

JSON error schema

100%

Error on stderr too

100%

NOT_FOUND exit code

100%

VALIDATION exit code

25%

Exit code constants

100%

_error helper

100%

Fail fast on missing args

100%

No decoration on stdout

100%

26%

Personal Note-Taking CLI

Command architecture, naming conventions, help system

Criteria

Without context

With context

Typer used

100%

Tool name convention

87%

100%

Resource plural noun

100%

Action verb lowercase

100%

Long flag kebab-case

100%

Short flag single letter

100%

--version flag

60%

100%

Help has examples

100%

jq pipe example

50%

100%

Command hierarchy

100%

Boolean flag no value

87%

100%

Consistent --json flag

20%

100%

90%

30%

Expense Tracker CLI

Data conventions and semantic exit codes

Criteria

Without context

With context

ISO 8601 date output

100%

Flexible date input

100%

Money as decimal

100%

Currency field included

100%

No money formatting

100%

IDs as strings

100%

Enum UPPER_SNAKE_CASE output

Enum case-insensitive input

100%

NOT_FOUND exit 3

100%

VALIDATION exit 4

100%

Correct error code string

100%

Repository: NeverSight/skills_feed
Commit: f772de4

Evaluated: about 1 month ago
Agent: Claude Code
Model: Claude Sonnet 4.6

Table of Contents

Local Contact Manager CLI Personal Note-Taking CLI Expense Tracker CLI

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