Where do I find the numeric reference IDs?

Activity Type ID, Gender ID and Contact Field Type ID are numeric IDs from your own instance. Read them from `/activitytypes`, `/genders` and `/contactfieldtypes` in Monica before hard-coding them — they differ per installation.

Why is my tag removal not working?

Tags add by name but remove by ID. Tags to Add takes tag names; Tags to Remove takes numeric tag IDs. They are not interchangeable.

What can it manage besides contacts?

Activities, calls, notes, conversations, journal entries, reminders, tags and tasks — the full set of things Monica tracks around a person.

Which credential does it need?

A Monica CRM API credential pointing at your instance.

Monica CRM Integration — Automate Monica CRM with AI Workflows

Overview

Monica CRM is an open-source personal relationship management tool. This tool supports 12 resources (Activity, Call, Contact, Contact Field, Contact Tag, Conversation, Conversation Message, Journal Entry, Note, Reminder, Tag, Task) with CRUD operations including create, get, get many, update, and delete. It connects to both cloud-hosted (app.monicahq.com) and self-hosted Monica instances via Bearer token authentication.

Node Type

Action — processes input items and produces output

Input / Output

Direction	Port(s)
Input	`Input`
Output	`Output`, `Error`

Credentials

This tool requires Monica CRM API credentials. See the Credentials Guide for setup instructions.

Resources

Resource	Value
Activity	`activity`
Call	`call`
Contact	`contact`
Contact Field	`contactField`
Contact Tag	`contactTag`
Conversation	`conversation`
Conversation Message	`conversationMessage`
Journal Entry	`journalEntry`
Note	`note`
Reminder	`reminder`
Tag	`tag`
Task	`task`

Operations

Operation	Value	Description
Create	`create`	Create an activity
Delete	`delete`	Delete an activity
Get	`get`	Get an activity
Get Many	`getAll`	List activities
Update	`update`	Update an activity
Create	`create`	Create a call
Delete	`delete`	Delete a call
Get	`get`	Get a call
Get Many	`getAll`	List calls
Update	`update`	Update a call
Create	`create`	Create a contact
Delete	`delete`	Delete a contact
Get	`get`	Get a contact
Get Many	`getAll`	List contacts
Update	`update`	Update a contact
Create	`create`	Create a contact field
Delete	`delete`	Delete a contact field
Get	`get`	Get a contact field
Update	`update`	Update a contact field
Add	`add`	Add tags to a contact
Remove	`remove`	Remove tags from a contact
Create	`create`	Create a conversation
Delete	`delete`	Delete a conversation
Get	`get`	Get a conversation
Update	`update`	Update a conversation
Add	`add`	Add a message to a conversation
Update	`update`	Update a conversation message
Create	`create`	Create a journal entry
Delete	`delete`	Delete a journal entry
Get	`get`	Get a journal entry
Get Many	`getAll`	List journal entries
Update	`update`	Update a journal entry
Create	`create`	Create a note
Delete	`delete`	Delete a note
Get	`get`	Get a note
Get Many	`getAll`	List notes
Update	`update`	Update a note
Create	`create`	Create a reminder
Delete	`delete`	Delete a reminder
Get	`get`	Get a reminder
Get Many	`getAll`	List reminders
Update	`update`	Update a reminder
Create	`create`	Create a tag
Delete	`delete`	Delete a tag
Get	`get`	Get a tag
Get Many	`getAll`	List tags
Update	`update`	Update a tag
Create	`create`	Create a task
Delete	`delete`	Delete a task
Get	`get`	Get a task
Get Many	`getAll`	List tasks
Update	`update`	Update a task

The operation list is scoped to the resource you pick, so most values appear once per resource. Contact Field and Conversation have no Get Many; Contact Tag offers only Add and Remove; Conversation Message offers only Add and Update.

Parameters

Activity: Create

Parameter	Type	Required	Default	Description
Activity Type ID	`string`	Yes	—	ID of the activity type. Retrieve available types from GET /activitytypes in your Monica CRM instance.
Contacts	`string`	Yes	—	Comma-separated list of IDs of the contacts to associate the activity with. Supports expressions.
Happened At	`string`	Yes	—	Date when the activity happened (ISO 8601 format). Supports expressions.
Summary	`string`	Yes	—	Brief description of the activity - max 255 characters. Supports expressions.
Additional Fields	`collection`	No	`{}`	Optional activity detail.
— Description	`string`	No	—	Description of the activity - max 100,000 characters.

Activity: Delete

Parameter	Type	Required	Default	Description
Activity ID	`string`	Yes	—	ID of the activity. Supports expressions.

Activity: Get

Parameter	Type	Required	Default	Description
Activity ID	`string`	Yes	—	ID of the activity. Supports expressions.

Activity: Get Many

Parameter	Type	Required	Default	Description
Return All	`boolean`	No	`false`	Whether to return all results or only up to a given limit.
Limit	`number`	No	`50`	Max number of results to return. (shown when Return All is `false`)

Activity: Update

Parameter	Type	Required	Default	Description
Activity ID	`string`	Yes	—	ID of the activity. Supports expressions.
Update Fields	`collection`	No	`{}`	The activity properties to change.
— Activity Type ID	`string`	No	—	ID of the activity type. Retrieve available types from GET /activitytypes in your Monica CRM instance.
— Contacts	`string`	No	—	Comma-separated IDs of the contacts to associate the activity with.
— Description	`string`	No	—	Description of the activity - max 100,000 characters.
— Happened At	`string`	No	—	Date when the activity happened (ISO 8601 format).
— Summary	`string`	No	—	Brief description of the activity - max 255 characters.

Call: Create

Parameter	Type	Required	Default	Description
Contact ID	`string`	Yes	—	ID of the contact to associate the call with. Supports expressions like {{ $json.contactId }}.
Called At	`string`	Yes	—	Date when the call happened (ISO 8601 format). Supports expressions.
Description (`content`)	`string`	Yes	—	Description of the call - max 100,000 characters. Supports expressions.

Call: Delete

Parameter	Type	Required	Default	Description
Call ID	`string`	Yes	—	ID of the call. Supports expressions.

Call: Get

Parameter	Type	Required	Default	Description
Call ID	`string`	Yes	—	ID of the call. Supports expressions.

Call: Get Many

Parameter	Type	Required	Default	Description
Return All	`boolean`	No	`false`	Whether to return all results or only up to a given limit.
Limit	`number`	No	`50`	Max number of results to return. (shown when Return All is `false`)

Call: Update

Parameter	Type	Required	Default	Description
Call ID	`string`	Yes	—	ID of the call. Supports expressions.
Update Fields	`collection`	No	`{}`	The call properties to change.
— Called At	`string`	No	—	Date when the call happened (ISO 8601 format).
— Contact ID	`string`	No	—	ID of the contact to associate the call with.
— Description	`string`	No	—	Description of the call - max 100,000 characters.

Contact: Create

Parameter	Type	Required	Default	Description
First Name	`string`	Yes	—	The contact’s first name. Supports expressions.
Gender ID	`string`	Yes	—	ID of the gender. Retrieve available genders from GET /genders in your Monica CRM instance.
Additional Fields	`collection`	No	`{}`	The rest of the contact record.
— Birthdate	`string`	No	—	Birthdate in ISO 8601 format (e.g. 1990-05-15).
— Deceased Date	`string`	No	—	Deceased date in ISO 8601 format.
— Is Deceased	`boolean`	No	`false`	Whether the contact has passed away.
— Last Name	`string`	No	—	The contact’s last name.
— Nickname	`string`	No	—	The contact’s nickname.
— Type	`options`	No	`false`	Whether the contact gets their own contact sheet.
				Options: `false` (Real — contact with their own contact sheet), `true` (Partial — contact without their own contact sheet)

Contact: Delete

Parameter	Type	Required	Default	Description
Contact ID	`string`	Yes	—	ID of the contact. Supports expressions.

Contact: Get

Parameter	Type	Required	Default	Description
Contact ID	`string`	Yes	—	ID of the contact. Supports expressions.

Contact: Get Many

Parameter	Type	Required	Default	Description
Filters	`collection`	No	`{}`	Narrow and order the contacts returned.
— Search Term	`string`	No	—	Search term to filter results by.
— Sort	`options`	No	—	Ordering of the returned contacts.
				Options: `created_at` (Ascended Created At), `-created_at` (Descended Created At), `updated_at` (Ascended Updated At), `-updated_at` (Descended Updated At)
Return All	`boolean`	No	`false`	Whether to return all results or only up to a given limit.
Limit	`number`	No	`50`	Max number of results to return. (shown when Return All is `false`)

Contact: Update

Parameter	Type	Required	Default	Description
Contact ID	`string`	Yes	—	ID of the contact. Supports expressions.
Update Fields	`collection`	No	`{}`	The contact properties to change.
— Birthdate	`string`	No	—	Birthdate in ISO 8601 format.
— Deceased Date	`string`	No	—	Deceased date in ISO 8601 format.
— First Name	`string`	No	—	The contact’s first name.
— Gender ID	`string`	No	—	ID of the gender. Retrieve available genders from GET /genders.
— Is Deceased	`boolean`	No	`false`	Whether the contact has passed away.
— Last Name	`string`	No	—	The contact’s last name.
— Nickname	`string`	No	—	The contact’s nickname.
— Type	`options`	No	`false`	Whether the contact gets their own contact sheet.
				Options: `false` (Real), `true` (Partial)

Contact Field: Create

Parameter	Type	Required	Default	Description
Contact ID	`string`	Yes	—	ID of the contact to associate the contact field with. Supports expressions.
Contact Field Type ID	`string`	Yes	—	ID of the contact field type. Retrieve available types from GET /contactfieldtypes in your Monica CRM instance.
Content (`data`)	`string`	Yes	—	Content of the contact field - max 255 characters. Supports expressions.

Contact Field: Delete

Parameter	Type	Required	Default	Description
Contact Field ID	`string`	Yes	—	ID of the contact field. Supports expressions.

Contact Field: Get

Parameter	Type	Required	Default	Description
Contact Field ID	`string`	Yes	—	ID of the contact field. Supports expressions.

Contact Field: Update

Parameter	Type	Required	Default	Description
Contact ID	`string`	Yes	—	ID of the contact to associate the contact field with. Supports expressions.
Contact Field Type ID	`string`	Yes	—	ID of the contact field type. Retrieve available types from GET /contactfieldtypes in your Monica CRM instance.
Content (`data`)	`string`	Yes	—	Content of the contact field - max 255 characters. Supports expressions.
Contact Field ID	`string`	Yes	—	ID of the contact field. Supports expressions.

Contact Tag: Add

Parameter	Type	Required	Default	Description
Contact ID	`string`	Yes	—	ID of the contact. Supports expressions.
Tags to Add	`string`	Yes	—	Comma-separated tag names to add to the contact. These are tag names (strings), not IDs.

Contact Tag: Remove

Parameter	Type	Required	Default	Description
Contact ID	`string`	Yes	—	ID of the contact. Supports expressions.
Tags to Remove	`string`	Yes	—	Comma-separated tag IDs to remove from the contact. Use numeric tag IDs, not names.

Conversation: Create

Parameter	Type	Required	Default	Description
Contact ID	`string`	Yes	—	ID of the contact to associate the conversation with. Supports expressions.
Contact Field Type ID	`string`	Yes	—	ID of the contact field type representing the communication channel. Retrieve from GET /contactfieldtypes.
Happened At	`string`	Yes	—	Date when the conversation happened (ISO 8601 format). Supports expressions.

Conversation: Delete

Parameter	Type	Required	Default	Description
Conversation ID	`string`	Yes	—	ID of the conversation. Supports expressions.

Conversation: Get

Parameter	Type	Required	Default	Description
Conversation ID	`string`	Yes	—	ID of the conversation. Supports expressions.

Conversation: Update

Parameter	Type	Required	Default	Description
Contact Field Type ID	`string`	Yes	—	ID of the contact field type representing the communication channel. Retrieve from GET /contactfieldtypes.
Happened At	`string`	Yes	—	Date when the conversation happened (ISO 8601 format). Supports expressions.
Conversation ID	`string`	Yes	—	ID of the conversation. Supports expressions.

Conversation Message: Add

Parameter	Type	Required	Default	Description
Conversation ID	`string`	Yes	—	ID of the conversation. Supports expressions like {{ $json.id }}.
Content (`content`)	`string`	Yes	—	Content of the message. Supports expressions.
Written At	`string`	Yes	—	Date when the message was written (ISO 8601 format). Supports expressions.
Written By	`options`	Yes	`true`	Author of the message.
				Options: `true` (User), `false` (Contact)

Conversation Message: Update

Parameter	Type	Required	Default	Description
Conversation ID	`string`	Yes	—	ID of the conversation. Supports expressions.
Message ID	`string`	Yes	—	ID of the message to update. Supports expressions.
Update Fields	`collection`	No	`{}`	The message properties to change.
— Contact ID	`string`	No	—	ID of the contact to associate the message with.
— Content	`string`	No	—	Content of the message.
— Written At	`string`	No	—	Date when the message was written.
— Written By	`options`	No	`true`	Author of the message.
				Options: `true` (User), `false` (Contact)

Journal Entry: Create

Parameter	Type	Required	Default	Description
Title	`string`	Yes	—	Title of the journal entry - max 250 characters. Supports expressions.
Content (`post`)	`string`	Yes	—	Content of the journal entry - max 100,000 characters. Supports expressions.

Journal Entry: Delete

Parameter	Type	Required	Default	Description
Journal Entry ID	`string`	Yes	—	ID of the journal entry. Supports expressions.

Journal Entry: Get

Parameter	Type	Required	Default	Description
Journal Entry ID	`string`	Yes	—	ID of the journal entry. Supports expressions.

Journal Entry: Get Many

Parameter	Type	Required	Default	Description
Return All	`boolean`	No	`false`	Whether to return all results or only up to a given limit.
Limit	`number`	No	`50`	Max number of results to return. (shown when Return All is `false`)

Journal Entry: Update

Parameter	Type	Required	Default	Description
Journal Entry ID	`string`	Yes	—	ID of the journal entry. Supports expressions.
Update Fields	`collection`	No	`{}`	The journal entry properties to change.
— Content	`string`	No	—	Content of the journal entry - max 100,000 characters.
— Title	`string`	No	—	Title of the journal entry - max 250 characters.

Note: Create

Parameter	Type	Required	Default	Description
Contact ID	`string`	Yes	—	ID of the contact to associate the note with. Supports expressions.
Body	`string`	Yes	—	Body of the note - max 100,000 characters. Supports expressions.
Additional Fields	`collection`	No	`{}`	Optional note settings.
— Is Favorited	`boolean`	No	`false`	Whether the note has been favorited.

Note: Delete

Parameter	Type	Required	Default	Description
Note ID	`string`	Yes	—	ID of the note. Supports expressions.

Note: Get

Parameter	Type	Required	Default	Description
Note ID	`string`	Yes	—	ID of the note. Supports expressions.

Note: Get Many

Parameter	Type	Required	Default	Description
Return All	`boolean`	No	`false`	Whether to return all results or only up to a given limit.
Limit	`number`	No	`50`	Max number of results to return. (shown when Return All is `false`)

Note: Update

Parameter	Type	Required	Default	Description
Note ID	`string`	Yes	—	ID of the note. Supports expressions.
Update Fields	`collection`	No	`{}`	The note properties to change.
— Body	`string`	No	—	Body of the note - max 100,000 characters.
— Contact ID	`string`	No	—	ID of the contact to associate the note with.
— Is Favorited	`boolean`	No	`false`	Whether the note has been favorited.

Reminder: Create

Parameter	Type	Required	Default	Description
Contact ID	`string`	No	—	ID of the contact to associate the reminder with. Supports expressions.
Frequency Type	`options`	Yes	`one_time`	Type of frequency of the reminder.
				Options: `one_time` (Once), `week` (Weekly), `month` (Monthly), `year` (Yearly)
Recurring Interval	`number`	No	`0`	Interval for the reminder (e.g. every 2 weeks). (shown when Frequency Type is `week`, `month`, `year`)
Initial Date	`string`	Yes	—	Date of the reminder (ISO 8601 format). Supports expressions.
Title	`string`	Yes	—	Title of the reminder - max 100,000 characters. Supports expressions.
Additional Fields	`collection`	No	`{}`	Optional reminder detail.
— Description	`string`	No	—	Description about the reminder - max 100,000 characters.

Reminder: Delete

Parameter	Type	Required	Default	Description
Reminder ID	`string`	Yes	—	ID of the reminder. Supports expressions.

Reminder: Get

Parameter	Type	Required	Default	Description
Reminder ID	`string`	Yes	—	ID of the reminder. Supports expressions.

Reminder: Get Many

Parameter	Type	Required	Default	Description
Return All	`boolean`	No	`false`	Whether to return all results or only up to a given limit.
Limit	`number`	No	`50`	Max number of results to return. (shown when Return All is `false`)

Reminder: Update

Parameter	Type	Required	Default	Description
Reminder ID	`string`	Yes	—	ID of the reminder. Supports expressions.
Update Fields	`collection`	No	`{}`	The reminder properties to change.
— Contact ID	`string`	No	—	ID of the contact to associate the reminder with.
— Description	`string`	No	—	Description about the reminder - max 100,000 characters.
— Frequency Type	`options`	No	`one_time`	Frequency of the reminder.
				Options: `one_time` (One Time), `week` (Week), `month` (Month), `year` (Year)
— Initial Date	`string`	No	—	Date of the reminder (ISO 8601 format).
— Recurring Interval	`number`	No	`0`	Interval for the reminder.
— Title	`string`	No	—	Title of the reminder - max 100,000 characters.

Tag: Create

Parameter	Type	Required	Default	Description
Name	`string`	Yes	—	Name of the tag - max 250 characters. Supports expressions.

Tag: Delete

Parameter	Type	Required	Default	Description
Tag ID	`string`	Yes	—	ID of the tag. Supports expressions.

Tag: Get

Parameter	Type	Required	Default	Description
Tag ID	`string`	Yes	—	ID of the tag. Supports expressions.

Tag: Get Many

Parameter	Type	Required	Default	Description
Return All	`boolean`	No	`false`	Whether to return all results or only up to a given limit.
Limit	`number`	No	`50`	Max number of results to return. (shown when Return All is `false`)

Tag: Update

Parameter	Type	Required	Default	Description
Name	`string`	Yes	—	Name of the tag - max 250 characters. Supports expressions.
Tag ID	`string`	Yes	—	ID of the tag. Supports expressions.

Task: Create

Parameter	Type	Required	Default	Description
Contact ID	`string`	Yes	—	ID of the contact to associate the task with. Supports expressions.
Title	`string`	Yes	—	Title of the task - max 250 characters. Supports expressions.
Additional Fields	`collection`	No	`{}`	Optional task detail.
— Description	`string`	No	—	Description of the task - max 100,000 characters.

Task: Delete

Parameter	Type	Required	Default	Description
Task ID	`string`	Yes	—	ID of the task. Supports expressions.

Task: Get

Parameter	Type	Required	Default	Description
Task ID	`string`	Yes	—	ID of the task. Supports expressions.

Task: Get Many

Parameter	Type	Required	Default	Description
Return All	`boolean`	No	`false`	Whether to return all results or only up to a given limit.
Limit	`number`	No	`50`	Max number of results to return. (shown when Return All is `false`)

Task: Update

Parameter	Type	Required	Default	Description
Task ID	`string`	Yes	—	ID of the task. Supports expressions.
Update Fields	`collection`	No	`{}`	The task properties to change.
— Completed	`boolean`	No	`false`	Whether the task has been completed.
— Contact ID	`string`	No	—	ID of the contact to associate the task with.
— Description	`string`	No	—	Description of the task - max 100,000 characters.
— Title	`string`	No	—	Title of the task - max 250 characters.

All Operations

Parameter	Type	Required	Default	Description
Max Concurrency	`number`	No	`10`	Maximum number of items to process concurrently.

Output Data

This node never fans out — every operation produces exactly one output item per input item. The Monica API envelope is unwrapped for you, so what you get is the record itself, not a wrapper.

Operation shape	What lands on the item
Any `getAll`	`items` — the array of records. Use a Split Out node on `items` if you want one workflow item per record
`create`, `get`, `update`, `add`, `remove`	The record merged into the item JSON at the top level
Any `delete`	`success: true`

Because single-record results are merged at the top level, the created record’s id is available to the next node straight away — chain a create into a note or a tag with {{ $json.id }}.

The rest of the item JSON passes through unchanged and binary data is forwarded.

Example Configuration

Create a contact:

{
  "type": "monica_crm",
  "parameters": {
    "resource": "contact",
    "operation": "create",
    "firstName": "John",
    "genderId": "1",
    "additionalFields": {
      "last_name": "Doe",
      "birthdate": "1990-05-15",
      "nickname": "Johnny"
    }
  }
}

Log an activity against two contacts:

{
  "type": "monica_crm",
  "parameters": {
    "resource": "activity",
    "operation": "create",
    "activityTypeId": "2",
    "contacts": "123,456",
    "happenedAt": "2023-12-01T10:00:00Z",
    "summary": "Meeting about project planning",
    "additionalFields": {
      "description": "Discussed project timeline and resource allocation"
    }
  }
}

Record a call:

{
  "type": "monica_crm",
  "parameters": {
    "resource": "call",
    "operation": "create",
    "contactId": "123",
    "calledAt": "2023-12-01T14:30:00Z",
    "content": "Discussed upcoming meeting and shared project updates"
  }
}

Create a note and mark it a favourite:

{
  "type": "monica_crm",
  "parameters": {
    "resource": "note",
    "operation": "create",
    "contactId": "123",
    "body": "Remember to follow up on the project proposal discussed during our last meeting",
    "additionalFields": {
      "isFavorited": true
    }
  }
}

Add tags to a contact — tag names, not IDs:

{
  "type": "monica_crm",
  "parameters": {
    "resource": "contactTag",
    "operation": "add",
    "contactId": "123",
    "tagsToAdd": "client,important,vip"
  }
}

Create a recurring reminder:

{
  "type": "monica_crm",
  "parameters": {
    "resource": "reminder",
    "operation": "create",
    "contactId": "123",
    "frequencyType": "month",
    "frequencyNumber": 3,
    "initialDate": "2024-01-15T09:00:00Z",
    "title": "Quarterly check-in call",
    "additionalFields": {
      "description": "Schedule quarterly business review with client"
    }
  }
}

Update contact information:

{
  "type": "monica_crm",
  "parameters": {
    "resource": "contact",
    "operation": "update",
    "contactId": "123",
    "updateFields": {
      "first_name": "Jonathan",
      "last_name": "Smith",
      "birthdate": "1990-05-20"
    }
  }
}

List contacts matching a search, oldest first:

{
  "type": "monica_crm",
  "parameters": {
    "resource": "contact",
    "operation": "getAll",
    "filters": {
      "query": "john",
      "sort": "created_at"
    },
    "returnAll": false,
    "limit": 50
  }
}

Chaining nodes. A create returns the new record on the item, so the node that follows can read its id directly. Put these two nodes in sequence to create a contact and immediately attach a note to it:

{
  "type": "monica_crm",
  "parameters": {
    "resource": "contact",
    "operation": "create",
    "firstName": "Sarah",
    "genderId": "2",
    "additionalFields": {
      "last_name": "Johnson",
      "birthdate": "1985-08-22",
      "nickname": "SJ"
    }
  }
}

{
  "type": "monica_crm",
  "parameters": {
    "resource": "note",
    "operation": "create",
    "contactId": "{{ $json.id }}",
    "body": "Initial contact established through networking event"
  }
}

The same pattern opens a conversation and posts its first message:

{
  "type": "monica_crm",
  "parameters": {
    "resource": "conversation",
    "operation": "create",
    "contactId": "123",
    "contactFieldTypeId": "5",
    "happenedAt": "2023-12-01T15:00:00Z"
  }
}

{
  "type": "monica_crm",
  "parameters": {
    "resource": "conversationMessage",
    "operation": "add",
    "conversationId": "{{ $json.id }}",
    "content": "Hi Sarah, thanks for the meeting today. Here are the action items we discussed...",
    "writtenAt": "2023-12-01T15:05:00Z",
    "writtenByMe": true
  }
}

Error Handling

Mode	Behavior
stop	Halts workflow on first error
continue	Skips failed items, passes successful ones through
errorPort	Routes failed items to Error output port

Tips

Monica CRM manages personal contacts, activities, calls, notes, conversations, journal entries, reminders, tags, and tasks. It is ideal for creating, updating, or retrieving specific relationship details when a user needs to manage their personal network. This tool produces updated or new entries, or retrieves existing information about personal relationships and associated activities.

Key Notes

Look up the reference IDs first. Activity Type ID, Gender ID and Contact Field Type ID are numeric IDs from your own instance — read them from /activitytypes, /genders and /contactfieldtypes in Monica before hard-coding them.
Tags add by name, remove by ID. Tags to Add takes tag names; Tags to Remove takes numeric tag IDs. They are not interchangeable.
Written By is a boolean, not a string. true means you wrote the message, false means the contact did.
Recurring Interval only appears for recurring reminders — pick week, month or year in Frequency Type first.
Update Fields use snake_case keys (first_name, happened_at, is_favorited) even though the create fields use camelCase.
List results are not separate items. Every Get Many returns one item with the array on items; add a Split Out node on items when downstream nodes should see one record at a time.

What you can build with Monica CRM