# Add Command

> Add support for a new CLI command. Use when implementing a handler or adding to SIMPLE_SAFE. Use when this capability is needed.

- Skill: `tomevault-io/add-command` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add tomevault-io/add-command`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/add-command/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: tomevault-io (https://skillmd.com/u/tomevault-io)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/tomevault-io/add-command

---


Add support for `$ARGUMENTS` in Dippy.

## 1. Research

**tldr pages:**
```
ls ~/source/tldr/pages/*/$ARGUMENTS*.md
cat ~/source/tldr/pages/*/$ARGUMENTS.md
```

**CLI docs:**
```
$ARGUMENTS --help
man $ARGUMENTS
```

Note which operations are read-only vs mutations.

## 2. Decide: Handler or SIMPLE_SAFE?

- **SIMPLE_SAFE**: Always safe regardless of arguments (read-only, no destructive flags). Go to step 3A.
- **Handler**: Needs subcommand/flag analysis. Go to step 3B.

## 3A. SIMPLE_SAFE Path

Add to `SIMPLE_SAFE` in `src/dippy/core/allowlists.py` and add tests to `tests/test_simple.py` in the appropriate category. Skip to step 5.

## 3B. Handler Path

Create `tests/cli/test_$ARGUMENTS.py`:

```python
"""Test cases for $ARGUMENTS."""

import pytest
from conftest import is_approved, needs_confirmation

TESTS = [
    # Safe operations
    ("$ARGUMENTS <safe-subcommand>", True),
    ("$ARGUMENTS --help", True),
    # Unsafe operations
    ("$ARGUMENTS <unsafe-subcommand>", False),
]

@pytest.mark.parametrize("command,expected", TESTS)
def test_command(check, command: str, expected: bool):
    result = check(command)
    if expected:
        assert is_approved(result), f"Expected approve: {command}"
    else:
        assert needs_confirmation(result), f"Expected confirm: {command}"
```

## 4. Implement Handler

Create `src/dippy/cli/$ARGUMENTS.py`:

```python
"""$ARGUMENTS handler for Dippy."""

from dippy.cli import Classification, HandlerContext

COMMANDS = ["$ARGUMENTS"]

SAFE_ACTIONS = frozenset({"list", "show", "status"})

def classify(ctx: HandlerContext) -> Classification:
    tokens = ctx.tokens
    action = tokens[1] if len(tokens) > 1 else None
    if action in SAFE_ACTIONS:
        return Classification("allow", description=f"$ARGUMENTS {action}")
    return Classification("ask", description="$ARGUMENTS")
```

For handler patterns (nested subcommands, flag-checking, delegation), see [patterns.md](patterns.md).

## 5. Iterate

```
just test
```

Fix failures until tests pass.

## 6. Verify

`just check` MUST pass before you're done.

---
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<!-- tomevault:4.0:skill_md:2026-04-11 -->