PrimeCal MCP Tools and Resources

This page documents the canonical PrimeCal MCP surface exposed by the server.

Tool Families

Organisations, Resources, and Reservations

primecal_organisations_list
primecal_organisations_active_set
primecal_organisations_billing_status_get
primecal_organisations_billing_settings_update
primecal_organisations_stripe_onboardingLink_create
primecal_organisations_payments_debug_get
primecal_resourceTypes_list
primecal_resources_list
primecal_reservations_availability_list
primecal_reservations_list
primecal_reservations_get
primecal_reservations_create

Common input fields:

organisationId for active-organisation switching only
resourceTypeId
optional resourceId
date for day-level availability
startTime / endTime for reservation creation
optional status, startFrom, and endTo for reservation listing

Important behavior:

reservation and resource tools resolve the active organisation from the agent context, not from arbitrary client payloads
billing and payment-debug tools also use the active organisation, but require explicit organisation scope and organisation-admin ownership context
availability uses the same blocking logic as public booking
MCP does not expose Stripe keys, Checkout sessions, payment intents, or webhook handling
reservation creation is limited to non-payment flows unless the owner context is acting in an administrative organisation role

Billing-specific input fields:

defaultCurrency for billing-safe updates
optional reservationId / bookingId
optional paymentStatus
optional limit

Calendars and Events

primecal_calendars_list
primecal_calendars_get
primecal_calendars_events_list
primecal_calendars_events_search_v2
primecal_calendars_events_get_v2
primecal_calendars_events_create
primecal_calendars_events_update
primecal_calendars_events_delete
primecal_calendar_userGroups_list
primecal_calendar_userGroups_details
primecal_calendar_userGroups_createInvite
primecal_calendar_userGroups_acceptInvite
primecal_calendar_userGroups_attachCalendars
primecal_calendar_userGroups_detachCalendars

Common input fields:

optional calendarId (number)
optional calendarIds (number array)
from / to (ISO 8601 UTC timestamps)
optional fields, limit, cursor, expandRecurrences, includeFullDescription, and userTimezone
eventId or id for updates/deletes
event object for create/update payloads

Recommended references:

People-group tool input fields:

groupId (number)
groupIds (number array) for optional filtering on list
calendarIds (number array) for attach/detach operations
permission (read, write, or admin) for attach operations
email and optional message for invite creation
token for invite acceptance

People-group tools are gated by calendar.userGroups.* action keys. Attach and detach tools require both group scope and calendar scope.

Tasks and Reminders

primecal_tasks_list
primecal_tasks_create
primecal_tasks_update
primecal_tasks_delete
primecal_tasks_labels_list
primecal_tasks_labels_create
primecal_tasks_labels_update
primecal_tasks_labels_delete
primecal_tasks_focus_list
primecal_tasks_auto_schedule
primecal_tasks_accept_assignment
primecal_tasks_bounce_assignment
primecal_tasks_dependencies_add
primecal_tasks_dependencies_remove
primecal_tasks_checklist_list
primecal_tasks_checklist_add
primecal_tasks_checklist_update
primecal_tasks_checklist_remove
primecal_reminders_create
primecal_reminders_update

Reminder tools are task-backed and map reminder fields (remindAt, note) into task fields (dueDate, body).

primecal_tasks_create/primecal_tasks_update also accept durationMinutes (1-1440, used by auto-scheduling), context (deep_work, errand, admin, kid_safe, low_energy), autoScheduled, and preferredWindowStartHour/preferredWindowEndHour (0-23) — e.g. "block 30 minutes of deep work to write the report" maps to primecal_tasks_create with durationMinutes: 30, context: 'deep_work'.

primecal_tasks_focus_list accepts an optional date (YYYY-MM-DD, defaults to today UTC) and returns the same schedule-ordered, dependency-filtered list as GET /api/tasks/focus.

primecal_tasks_auto_schedule, primecal_tasks_accept_assignment, and primecal_tasks_bounce_assignment each accept taskId or id; bounce also accepts an optional reason (max 500 chars). primecal_tasks_dependencies_add/_remove take taskId and dependsOnTaskId.

primecal_tasks_checklist_list/_add/_update/_remove all take taskId, plus title (add), or itemId/id with optional title/isDone/order (update), or itemId/id (remove) — e.g. "add 'book venue' to my party-planning task's checklist" maps to primecal_tasks_checklist_add. All four return the task's full updated checklist.

Routines and Household

primecal_routine_templates_list
primecal_routine_templates_clone
primecal_routine_templates_instantiate
primecal_routine_templates_streak
primecal_routine_templates_skip
primecal_household_items_list
primecal_household_items_create
primecal_household_items_mark_used_up
primecal_household_items_consume

primecal_routine_templates_clone accepts templateId/id and an optional groupId to clone a system template into a people group instead of the caller's personal templates. primecal_routine_templates_instantiate accepts templateId/id and starts the template right now — e.g. "start my evening routine" — the same as the Start now button, independent of the template's recurrence schedule.

primecal_routine_templates_streak accepts templateId/id and returns { currentStreak, longestStreak, lastCompletedDate, totalInstantiations }. primecal_routine_templates_skip accepts templateId/id and skips today's occurrence without creating tasks — e.g. "skip cleaning this week, we're travelling" — without disturbing rotation history.

primecal_household_items_create accepts name, category, quantity, groupId, expiryDate (YYYY-MM-DD), shelfLifeDays (1-3650), and lowStockThreshold (>= 0, an independent count-based restock trigger). primecal_household_items_mark_used_up accepts an item id and flags it so the hourly restock scan raises a task for it. primecal_household_items_consume accepts itemId/id and an optional amount (defaults to 1) to reduce quantity — e.g. "used 2 rolls of paper towels."

See the Routine Templates API and Household Items API for the underlying REST contract and rotation/restock behavior these tools call into.

Automation

primecal_automation_rules_list
primecal_automation_rules_get
primecal_automation_rules_trigger
primecal_automation_rules_audit_list

Common input fields:

ruleId (number)
optional status, fromDate, toDate
pagination (page, limit)

Profile and Context

primecal_profile_get
primecal_context_snapshot

Context snapshot input:

days (1-30)
tasksLimit (1-200)
eventsLimit (1-200)
includeCompletedTasks (boolean)

Notifications

primecal_notifications_list
primecal_notifications_mark_read
primecal_notifications_act
primecal_notifications_preferences_get
primecal_notifications_preferences_update

Common input fields:

optional unreadOnly, archived (booleans), and threadId (number) for list filtering
optional afterCursor (opaque ISO-timestamp cursor) for list pagination
ids (number array, 1-100) for marking notifications read
notificationId (number) and actionType (confirm | snooze | delegate | claim | done | undo | ack), plus an optional payload object (e.g. { snoozeUntil } or { snoozeMinutes } for a snooze action) for primecal_notifications_act
preferences (array of { eventType, channels, digest?, fallbackOrder?, quietHours? }) for preference updates

All five tools are scoped to the authenticated user's own notifications and preferences; there is no cross-user access. primecal_notifications_list returns at most 50 notifications, newest first. primecal_notifications_act records the 'acted' lifecycle stage via the same NotificationsService.recordAction path as the REST /notifications/:id/act endpoint, and also handles side effects (marking read, archiving on done/confirm, snooze rescheduling, clearing archive state on undo). primecal_notifications_preferences_update replaces the stored preference for each submitted eventType — event types left out of the array are removed, matching the behavior of PUT /api/notifications/preferences.

Resources

primecal.current-context (primecal://current-context)
primecal.automation-summary (primecal://automation-summary)
primecal.calendar.user-groups (primecal://calendar/user-groups)
primecal.calendar.user-group-detail (primecal://calendar/user-groups/{id})

Both resources return application/json textual content in MCP resources/read responses.

People-group resources are read-only and only include groups and calendars allowed by the agent's scope.

Enterprise Reservation JSON-RPC Examples

Switch the active organisation

{
  "jsonrpc": "2.0",
  "id": 30,
  "method": "tools/call",
  "params": {
    "name": "primecal_organisations_active_set",
    "arguments": {
      "organisationId": 12
    }
  }
}

Read availability for one service

{
  "jsonrpc": "2.0",
  "id": 31,
  "method": "tools/call",
  "params": {
    "name": "primecal_reservations_availability_list",
    "arguments": {
      "date": "2026-05-20",
      "resourceTypeId": 8
    }
  }
}

Create a non-payment reservation

{
  "jsonrpc": "2.0",
  "id": 32,
  "method": "tools/call",
  "params": {
    "name": "primecal_reservations_create",
    "arguments": {
      "resourceTypeId": 8,
      "resourceIds": [41, 42],
      "startTime": "2026-05-20T10:00:00Z",
      "endTime": "2026-05-20T11:00:00Z",
      "notes": "Agent-assisted booking"
    }
  }
}

Read active-organisation billing status

{
  "jsonrpc": "2.0",
  "id": 33,
  "method": "tools/call",
  "params": {
    "name": "primecal_organisations_billing_status_get",
    "arguments": {}
  }
}

Update the default billing currency

{
  "jsonrpc": "2.0",
  "id": 34,
  "method": "tools/call",
  "params": {
    "name": "primecal_organisations_billing_settings_update",
    "arguments": {
      "defaultCurrency": "eur"
    }
  }
}

Prepare Stripe onboarding

{
  "jsonrpc": "2.0",
  "id": 35,
  "method": "tools/call",
  "params": {
    "name": "primecal_organisations_stripe_onboardingLink_create",
    "arguments": {}
  }
}

Inspect payment-debug state

{
  "jsonrpc": "2.0",
  "id": 36,
  "method": "tools/call",
  "params": {
    "name": "primecal_organisations_payments_debug_get",
    "arguments": {
      "paymentStatus": "pending",
      "limit": 10
    }
  }
}

People-Group JSON-RPC Examples

List scoped groups and calendars

{
  "jsonrpc": "2.0",
  "id": 20,
  "method": "tools/call",
  "params": {
    "name": "primecal_calendar_userGroups_list",
    "arguments": {
      "includeCalendars": true
    }
  }
}

Create a group invite

{
  "jsonrpc": "2.0",
  "id": 21,
  "method": "tools/call",
  "params": {
    "name": "primecal_calendar_userGroups_createInvite",
    "arguments": {
      "groupId": 9,
      "email": "teammate@example.com",
      "message": "Join the shared planning calendars."
    }
  }
}

The result is intentionally generic and does not disclose whether the email maps to an existing PrimeCal user.

Attach a calendar to a group

{
  "jsonrpc": "2.0",
  "id": 22,
  "method": "tools/call",
  "params": {
    "name": "primecal_calendar_userGroups_attachCalendars",
    "arguments": {
      "groupId": 9,
      "calendarIds": [5],
      "permission": "write"
    }
  }
}

Read the group summary resource

{
  "jsonrpc": "2.0",
  "id": 23,
  "method": "resources/read",
  "params": {
    "uri": "primecal://calendar/user-groups"
  }
}

Schema and Result Model

All tools are listed through MCP tools/list and publish JSON Schema-compatible inputSchema objects.

Result shape follows MCP conventions, with the following important distinctions:

Array-returning tools

Tools that return collections (listOrganisations, listResources, listReservations, primecal_calendars_events_list, etc.) do not set structuredContent. Callers must parse the JSON string in content[0].text to obtain the array.

{
  "content": [
    {
      "type": "text",
      "text": "[{\"id\":41,\"name\":\"Pool lane A\"},{\"id\":42,\"name\":\"Pool lane B\"}]"
    }
  ]
}

Object-returning tools

Tools that return a single object set structuredContent to the object directly (not wrapped in another object).

{
  "content": [
    {
      "type": "text",
      "text": "{\"id\":42,\"title\":\"Project review\"}"
    }
  ],
  "structuredContent": {
    "id": 42,
    "title": "Project review"
  }
}

Error envelope

All errors set isError: true, include a human-readable description in content[0].text, and always set structuredContent to the error object:

{
  "isError": true,
  "content": [
    {
      "type": "text",
      "text": "Agent does not have access to this tool or scope."
    }
  ],
  "structuredContent": {
    "error": {
      "type": "forbidden",
      "message": "Agent does not have access to this tool or scope.",
      "statusCode": 403,
      "retriable": false
    }
  }
}

Error type values:

`type`	HTTP status	Meaning
`validation_error`	400	Malformed input or DTO validation failure.
`unauthorized`	401	Missing or invalid agent key.
`forbidden`	403	Valid key but insufficient permission scope.
`not_found`	404	Requested resource does not exist.
`conflict`	409	State conflict (e.g. booking overlap).
`rate_limited`	429	Rate limit exceeded; retry after back-off.
`http_error`	5xx	Upstream or server-side failure.
`internal_error`	—	Unexpected internal error.

retriable is true for transient errors (rate_limited, some http_error variants) and false for permanent failures.

Migration note: previous docs showed "type": "permission_denied" in the error envelope. This type no longer exists — use "forbidden" (HTTP 403) instead. Callers that matched on "permission_denied" must update to "forbidden".

Payload Richness Expectations

PrimeCal tools should return rich data so AI hosts can reason with minimal extra round trips.

Event objects include timeline, recurrence, status, color, and metadata.
People-group objects include role, minimal member summaries, invite-safe metadata, and simplified calendar references when scoped.
Task objects include labels and task-calendar mirror metadata.
Automation responses include rule definitions, counters, and audit records.
Reservation objects include assigned resources, resource type, quote snapshot, customer payload, status, and payment state.

Quick Protocol Smoke Test

initialize against /api/mcp
tools/list
resources/list
tools/call with primecal_profile_get
resources/read for primecal://current-context

May.B.Late demo expectation:

primecal_calendars_list should include Work, Personal, and Side projects.
primecal_calendar_userGroups_list should return only groups allowed by the agent's user-group scope.
primecal_organisations_list should return only organisations allowed by the agent profile and underlying owner access.

Tool Families​

Organisations, Resources, and Reservations​

Calendars and Events​

Tasks and Reminders​

Routines and Household​

Automation​

Profile and Context​

Notifications​

Resources​

Enterprise Reservation JSON-RPC Examples​

Switch the active organisation​

Read availability for one service​

Create a non-payment reservation​

Read active-organisation billing status​

Update the default billing currency​

Prepare Stripe onboarding​

Inspect payment-debug state​

People-Group JSON-RPC Examples​

List scoped groups and calendars​

Create a group invite​

Attach a calendar to a group​

Read the group summary resource​

Schema and Result Model​

Array-returning tools​

Object-returning tools​

Error envelope​

Payload Richness Expectations​

Quick Protocol Smoke Test​

Tool Families

Organisations, Resources, and Reservations

Calendars and Events

Tasks and Reminders

Routines and Household

Automation

Profile and Context

Notifications

Resources

Enterprise Reservation JSON-RPC Examples

Switch the active organisation

Read availability for one service

Create a non-payment reservation

Read active-organisation billing status

Update the default billing currency

Prepare Stripe onboarding

Inspect payment-debug state

People-Group JSON-RPC Examples

List scoped groups and calendars

Create a group invite

Attach a calendar to a group

Read the group summary resource

Schema and Result Model

Array-returning tools

Object-returning tools

Error envelope

Payload Richness Expectations

Quick Protocol Smoke Test