Claude BusyCal connectorWhat Claude can do in your BusyCal account.
The Claude BusyCal connector exposes 21 tools: 9 read, 12 write. Claude can search your events and tasks, find free slots, then create, move, complete or delete items in BusyCal on your Mac. Below: what it reads, what it changes, and why the tool count differs.
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Why plug BusyCal into Claude
Planning a week means flipping between calendars, a task list and a scratch pad of who needs what. With this desktop extension, you talk to Claude about your schedule and it reads and writes BusyCal directly on your Mac. Changes are saved in BusyCal as usual and sync through the calendar accounts you already use.
A morning overview, then quick fixes. Ask what your day looks like: query_events and query_tasks pull today's items, and a follow-up like push the review to Thursday goes through move_event without you opening the app.
The next free hour, found for you. find_next_available looks for the next open slot of a given length, and create_event books it, with time zones, reminders and travel time if you mention them.
Act on what you already selected. Highlight a few tasks in BusyCal and say defer these to Monday: selected_items reads the selection, then defer_task changes each due date.
What it won't do: work outside BusyCal. The publisher states the extension only reads and writes BusyCal calendar data, never your files or other apps. It needs BusyCal installed on the Mac and runs inside Claude Desktop. Nothing happens on its own either: Claude acts when you ask. Scheduled jobs across apps are an automation tool's trade; the Integrations hub covers that side.
The vocabulary in one minute
Five words you will meet while plugging BusyCal into Claude.
- Connector
- The link you set up once between Claude and something you already use, here BusyCal on your Mac, so Claude can work in it while it answers.
- Tool
- One named job the connector opens to Claude, like moving an event. Claude picks the tools it needs; the directory lists them by name.
- Authorization
- The step where you hand Claude the access it will use afterwards. Granted once per person, and it can be taken back the same way.
- Approval
- The confirmation Claude waits for before it goes ahead with something that changes your calendar, shown in the chat when it matters.
- MCP
- The shared standard connectors are built on: it is what lets an assistant like Claude talk to an outside app such as BusyCal.
Connect BusyCal to Claude in three steps
- 01
Find BusyCal in Claude
This is a desktop extension, so it lives in Claude Desktop. In Claude's settings, open Customize, then Connectors, and look for BusyCal. On a Team or Enterprise workspace, an Owner or Primary Owner switches it on first.
- 02
Start the connection
Click Connect on its row and follow the prompts. If the link breaks later, use Disconnect, then plug it back in; access can also be withdrawn from the other side whenever you want.
- 03
Read what you grant
Read the authorization screen before you accept: it decides what the access covers, and it may sound wider than what Claude does day to day. BusyCal says its extension needs no permissions beyond what BusyCal already has.
The 21 tools, sorted by what they do
BusyCal gives Claude 21 tools: 9 that read your account, 12 that change something in it.
Nine tools look things up, twelve create, change or remove items. Names stay in English, exactly as Claude shows them.
- 9 read
- 12 write
What Claude reads (9)
9 toolsNine tools that browse, search or reveal items without changing them.
list_accounts
Lists the calendar accounts BusyCal holds on your Mac, so Claude knows where each calendar lives before it does anything else.
list_calendars
Returns your calendars, optionally filtered by account, and can leave out subscription, holiday or birthday calendars that only clutter the answer.
selected_items
Reads the events or tasks you have selected right now in the BusyCal window, with the same fields a search returns, so Claude can work on exactly those items without searching again.
query_items
Searches across events, tasks, journals, graphics and stickies at once, which is the widest net BusyCal offers to Claude.
query_events
Finds events by keyword, date range or calendar, so Claude can tell you what your schedule holds without you scrolling through weeks of it.
query_tasks
Finds tasks by keyword, date range or calendar: the to-do side of your BusyCal data, searched apart from events.
query_availability
Shows your free and busy time slots across the date range you give, so Claude proposes openings from your real calendar instead of guessing.
find_next_available
Looks ahead for the first free slot of at least the length you set, and returns that single slot rather than a full map of your availability.
open_item
Opens a specific event or task in the BusyCal window, so you see it in the app itself. Nothing is edited.
What Claude changes (12)
12 toolsTwelve tools that add, edit, move or delete items in BusyCal. No source details a confirmation for them: the general rule below applies.
create_natural_language_item
Approval: see the ruleCreates an event, task or journal entry from a line of BusyCal Quick Entry text, with the item type stated explicitly.
create_event
Approval: see the ruleAdds an event to any calendar, with location, reminders, travel time and named time zones for meetings across regions.
create_task
Approval: see the ruleAdds a task with an optional due date, reminders, priority, starred status and time zone, on the calendar you name.
duplicate_item
Approval: see the ruleCopies an existing event or task, optionally onto another calendar. For recurring items, only the selected occurrence is copied by default.
move_event
Approval: see the ruleMoves an event to a new date or time, with a named time zone if needed.
defer_task
Approval: see the ruleChanges a task's due date, optionally with a time zone, and leaves the rest of the task as it was.
complete_task
Approval: see the ruleMarks a task as completed in BusyCal, which syncs through your usual calendar account.
uncomplete_task
Approval: see the ruleUndoes a completion and puts a finished task back among open ones.
update_event
Approval: see the ruleChanges an event's title, location, notes, links, tags, reminders or travel time, without touching its date.
update_task
Approval: see the ruleRewrites a task's title, notes, links, tags, reminders, priority or starred status.
delete_event
Approval: see the ruleRemoves an event from BusyCal, and the deletion syncs through the account that holds that calendar.
delete_task
Approval: see the ruleRemoves a task outright, rather than marking it done.
What Claude asks before it acts
By default, Claude stops and asks for your go-ahead before any action it takes on your behalf. For BusyCal, no source says which of the twelve writing tools, deletions included, trigger a prompt of their own.
BusyCal draws its own boundary: it describes the extension as able to read and write BusyCal calendar data only, without access to your files, other apps or anything outside BusyCal. On Team and Enterprise, owners decide whether members can let some actions through without being asked each time, and they can restrict what a connector may do for the whole organization; nobody undoes that from their own account. And Claude never reaches further than the person connected.
Which plans it's available on
None of the 819 sheets in the official directory shows plan availability. For one specific connector, the answer isn't published anywhere: a real hole in the catalogue.
The general rule is public. Remote connectors are open to all users on Claude, Cowork, Claude Desktop and mobile, and desktop extensions like BusyCal's install in Claude Desktop. On Team and Enterprise, an Owner or Primary Owner switches a connector on for the organization before members can link it. To see where this one stands for your account, open the connector's sheet in the official directory, which is the only place kept current.
Where this connector stops
A connector is not an automation. Claude calls these tools while it answers you: no event gets created at midnight and no task moves while you are away.
Everything BusyCal-specific here comes from BusyCal's own documentation, since no Claude help article covers it. The directory badge is not a security audit, and Anthropic says on every sheet that it doesn't control which tools a publisher exposes or guarantee their behavior. The extension also needs BusyCal running on the Mac, which it opens itself if needed. The same questions get the same treatment on the Claude activecampaign connector page.
How many tools does BusyCal give Claude?
- Claude connector directory, BusyCal sheet ↗October 2026The sheet lists 21 tools for BusyCal.
- BusyCal documentation ↗September 2026Extension version 1.2.0 gives Claude 26 tools, five more than earlier versions exposed.
What this page followsNeither is wrong: they describe different versions of the extension. This page documents the 21 tools on the directory sheet. The five extra tools depend on the version you install, so check which BusyCal and extension versions you run if one seems missing.
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