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Fantastical Calendar · twhsi | DecimalAI

productivityby twhsi

Fantastical Calendar

twhsi/fantastical-calendar

Source twhsi/skills ↗License Not recorded

Create Fantastical calendar events and reminders from Codex on macOS.

SkillScore41Maintained

Automatic

Personal Assistant pack

Last verified 8/24/2026

What it changes

Passed 4 of 9 test cases with the skill, and 3 of 9 without it.

Without skill32%

With skill41%

Checks it passed that the model alone missed

Includes the --dry-run flag in the command
Uses the relative path scripts/fantastical_parse.py

2 fixed7 passed either way13 still failing0 broke

Pass-rate lift: +9 pp
Tokens: +6%
Agent turns: 0%
Response time: -34%

Model gemini-3.6-flashMeasured 8/24/2026v19 of 22 cases passed with skill · 9 comparable

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/twhsi-fantastical-calendar/SKILL.md https://app.decimal.ai/s/twhsi-fantastical-calendar/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add twhsi-fantastical-calendar, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/twhsi-fantastical-calendar/ and pins it in .decimal/skills.lock

decimalai skills add twhsi-fantastical-calendar

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/twhsi-fantastical-calendar/SKILL.md https://app.decimal.ai/s/twhsi-fantastical-calendar/SKILL.md

Raw file: /s/twhsi-fantastical-calendar/SKILL.md ↗ · machine-readable summary at /s/twhsi-fantastical-calendar.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 2 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 2

Prompt

What CLI command should be executed to preview 'Design Review on 2026-07-04 at 10:00 for 1 hour' using the skill repository's script?

What was checked, without and with the skill
Checked	Without skill	With skill
Uses the relative path scripts/fantastical_parse.py	Missed	Passed

case-13 · gemini-3.6-flash · 8/24/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md61 lines3 filesincludes scripts

Fantastical Calendar

Overview

Use this skill to turn a user's natural-language scheduling request into a Fantastical event or reminder through the local macOS Fantastical app.

Prefer the bundled script over ad hoc AppleScript:

python3 scripts/fantastical_parse.py "Project review on 2026-06-19 at 10:00" --notes "Prep deck before the call"

The script defaults to preview mode: it opens Fantastical with the parsed item but does not add it immediately.

Workflow

Clarify only when a calendar detail is genuinely ambiguous: date, time, duration, title, attendee context, calendar, or whether it is an event vs reminder.
Convert relative dates into explicit dates before sending to Fantastical whenever possible. Use the user's current timezone from the thread context or check the system date if needed.
Build one concise Fantastical sentence containing the title, exact date, start time, and duration or end time.
Put extra context, links, preparation notes, or source text in --notes instead of overloading the event title.
Run scripts/fantastical_parse.py from this skill folder.
Tell the user whether Fantastical was opened for review or the item was added immediately.

Add Policy

Use preview mode unless the user explicitly asks to add/create/schedule it now or has confirmed the parsed result.

Preview:

python3 scripts/fantastical_parse.py "Deep work on 2026-06-19 from 09:00 to 11:00"

Add immediately:

python3 scripts/fantastical_parse.py "Deep work on 2026-06-19 from 09:00 to 11:00" --add-immediately

Dry run for validation:

Track record

Benchmark

4 / 9

test cases passed, vs 3 / 9 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

twhsi / skills

skills/fantastical-calendar/SKILL.md

View on GitHub ↗

Imported 8/3/2026Version v1Bundled 2 files · scripts

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

Fantastical Calendar

Overview

Workflow

Add Policy

Track record

Benchmark

Adoption

SkillSafety

Source

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