agentmods.dev

things-mac

A command-line tool for managing Things 3, a task-management app on macOS. It can read tasks and add or update them through Things’ interfaces.

In plain words
What is it for?
It helps list inbox and upcoming tasks, search the local database, inspect projects and tags, and add tasks with notes, dates, or project placement.
Why use it?
It lets an agent work with Things tasks without requiring manual entry in the app.

Skill for Claude CodeCodex

456 2mo ago A scan 68 tokens copy · 97% MIT
View the source file understudy-ai/understudy
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/understudy-ai/understudy/things-mac
Any agent
npx skills add understudy-ai/understudy --skill things-mac
Clone the repo
git clone --depth 1 https://github.com/understudy-ai/understudy

Made for: Claude Code, Codex.

Per session 68 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 985 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 97% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00068 $0.00985
Opus 5 $0.00034 $0.00492
Sonnet 5 $0.00014 $0.00197
Haiku 4.5 $0.00007 $0.00098

Measured 2d ago against content hash 1e0a51bf22e9, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

things-mac scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

97% identical to things-mac — 6 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/things-mac/SKILL.md · 87 lines

What it actually says

Things 3 CLI

Use things to read your local Things database (inbox/today/search/projects/areas/tags) and to add/update todos via the Things URL scheme.

Setup

  • Install (recommended, Apple Silicon): GOBIN=/opt/homebrew/bin go install github.com/ossianhempel/things3-cli/cmd/things@latest
  • If DB reads fail: grant Full Disk Access to the calling app (Terminal for manual runs; Understudy.app for gateway runs).
  • Optional: set THINGSDB (or pass --db) to point at your ThingsData-* folder.
  • Optional: set THINGS_AUTH_TOKEN to avoid passing --auth-token for update ops.

Read-only (DB)

  • things inbox --limit 50
  • things today
  • things upcoming
  • things search "query"
  • things projects / things areas / things tags

Write (URL scheme)

  • Prefer safe preview: things --dry-run add "Title"
  • Add: things add "Title" --notes "..." --when today --deadline 2026-01-02
  • Bring Things to front: things --foreground add "Title"

Examples: add a todo

  • Basic: things add "Buy milk"
  • With notes: things add "Buy milk" --notes "2% + bananas"
  • Into a project/area: things add "Book flights" --list "Travel"
  • Into a project heading: things add "Pack charger" --list "Travel" --heading "Before"
  • With tags: things add "Call dentist" --tags "health,phone"
  • Checklist: things add "Trip prep" --checklist-item "Passport" --checklist-item "Tickets"
  • From STDIN (multi-line => title + notes):
    • cat <<'EOF' | things add -
    • Title line
    • Notes line 1
    • Notes line 2
    • EOF

Examples: modify a todo (needs auth token)

  • First: get the ID (UUID column): things search "milk" --limit 5
  • Auth: set THINGS_AUTH_TOKEN or pass --auth-token <TOKEN>
  • Title: things update --id <UUID> --auth-token <TOKEN> "New title"
  • Notes replace: things update --id <UUID> --auth-token <TOKEN> --notes "New notes"
  • Notes append/prepend: things update --id <UUID> --auth-token <TOKEN> --append-notes "..." / --prepend-notes "..."
  • Move lists: things update --id <UUID> --auth-token <TOKEN> --list "Travel" --heading "Before"
  • Tags replace/add: things update --id <UUID> --auth-token <TOKEN> --tags "a,b" / things update --id <UUID> --auth-token <TOKEN> --add-tags "a,b"
  • Complete/cancel (soft-delete-ish): things update --id <UUID> --auth-token <TOKEN> --completed / --canceled
  • Safe preview: things --dry-run update --id <UUID> --auth-token <TOKEN> --completed

Delete a todo?

  • Not supported by things3-cli right now (no “delete/move-to-trash” write command; things trash is read-only listing).
  • Options: use Things UI to delete/trash, or mark as --completed / --canceled via things update.

Notes

  • macOS-only.
  • --dry-run prints the URL and does not open Things.
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 87 lines · 68 tokens per session scan A 1e0a51bf22e9

Subscribe to this mod's changes

things-mac is a skill published in the GitHub repository understudy-ai/understudy (456 stars, last pushed 2mo ago), licensed MIT. It adds 68 tokens to every session and 985 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. It is 97% identical to things-mac, differing in 6 lines, and is treated as a copy.

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