Loops MCP by usefulapi

Server Details

Manage Loops contacts, mailing lists, and transactional/event emails.

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Status: Healthy
Uptime: 82.8% over 57 days
Last Tested: 2026-10-13 05:04
Transport: Streamable HTTP · MCP 2025-06-18
URL
Repository: m190/usefulapi-mcp
GitHub Stars: 0

TDQS

A3.7/5.0

Scored 2026-07-28 14:45 across 10 tools

Disambiguation5/5

Each tool has a distinct purpose and target resource (contacts, properties, lists, events, transactional emails, API key). No overlap or ambiguity in descriptions.

Naming Consistency5/5

All tools follow a consistent 'loops_verb_noun' pattern in snake_case. Verbs are descriptive and nouns match the resource.

Tool Count5/5

10 tools is well-scoped for the domain, covering contacts, properties, lists, events, transactional emails, and an API test. Neither sparse nor overloaded.

Completeness4/5

Covers core contact CRUD, property creation, listing, and sending capabilities. Minor gap: no update/delete for contact properties, but the surface handles primary workflows.

Available Tools

10 tools

loops_create_contactCreate a contact

Destructive

Inspect

Creates a contact in Loops (additive). Loops API: POST /v1/contacts/create.

ParametersJSON Schema

Name	Required	Description
`email`	Yes	Contact email address (required).
`source`	No	Source label for where the contact came from.
`userId`	No	Your app's user id for this contact.
`lastName`	No	Last name.
`firstName`	No	First name.
`userGroup`	No	User group segment name.
`properties`	No	Arbitrary custom contact properties (string/number/boolean); merged into the request body.
`subscribed`	No	Whether the contact is subscribed to email.
`mailingLists`	No	Map of mailing-list id -> subscribed boolean.

loops_create_contact_propertyCreate a contact property

Destructive

Inspect

Creates a custom contact property/field (additive schema change). Loops API: POST /v1/contacts/properties.

ParametersJSON Schema

Name	Required	Description	Default
`name`	Yes	Name of the custom property to create (required).
`type`	Yes	Data type of the property (required).

loops_delete_contactDelete a contact

Destructive

Inspect

Deletes a contact from Loops. Destructive. Supply email OR userId. Loops API: POST /v1/contacts/delete.

ParametersJSON Schema

Name	Required	Description	Default
`email`	No	Email of the contact to delete.
`userId`	No	userId of the contact to delete.

loops_find_contactFind a contact

Read-only

Inspect

Find a contact by email or userId (supply at least one). Loops API: GET /v1/contacts/find.

ParametersJSON Schema

Name	Required	Description	Default
`email`	No	Contact email address to look up.
`userId`	No	Contact userId to look up (your app's user id).

loops_list_contact_propertiesList contact properties

Read-only

Inspect

List contact fields / custom properties defined in Loops. Loops API: GET /v1/contacts/properties.

ParametersJSON Schema

Name	Required	Description	Default
`list`	No	Which properties to return: all (default) or custom only.

loops_list_mailing_listsList mailing lists

Read-only

Inspect

List all mailing lists in the Loops account (id + name). Loops API: GET /v1/lists.

ParametersJSON Schema

Name	Required	Description	Default
No parameters

loops_send_eventSend an event

Destructive

Inspect

Sends an event to Loops for a contact — TRIGGERS any automations/loops subscribed to this event. Loops API: POST /v1/events/send.

ParametersJSON Schema

Name	Required	Description
`email`	No	Contact email (supply email or userId).
`userId`	No	Contact userId (supply email or userId).
`eventName`	Yes	The event name to send (required).
`mailingLists`	No	Map of mailing-list id -> subscribed boolean.
`eventProperties`	No	Properties attached to this event.
`contactProperties`	No	Contact properties to update alongside the event.

loops_send_transactionalSend a transactional email

Destructive

Inspect

SENDS a real transactional email via a Loops template. This dispatches an actual email to the recipient. Loops API: POST /v1/transactional.

ParametersJSON Schema

Name	Required	Description
`email`	Yes	Recipient email address (required).
`attachments`	No	Optional attachments: array of { filename, contentType, data } objects.
`addToAudience`	No	Whether to add the recipient to your audience.
`dataVariables`	No	Template data variables (string/number) to interpolate into the template.
`transactionalId`	Yes	The Loops transactional template id (required).

loops_test_api_keyTest API key

Read-only

Inspect

Verify the configured Loops API key and return the team name — a good first call. Loops API: GET /v1/api-key.

ParametersJSON Schema

Name	Required	Description	Default
No parameters

loops_update_contactUpdate a contact

Destructive

Inspect

Updates (or creates) a contact by email/userId. Upserts — creates the contact if not found. Loops API: PUT /v1/contacts/update.

ParametersJSON Schema

Name	Required	Description
`email`	Yes	Contact email address (required; identifies the contact).
`source`	No	Source label.
`userId`	No	Your app's user id (alternative identifier).
`lastName`	No	Last name.
`firstName`	No	First name.
`userGroup`	No	User group segment name.
`properties`	No	Arbitrary custom contact properties (string/number/boolean); merged into the request body.
`subscribed`	No	Whether the contact is subscribed to email.
`mailingLists`	No	Map of mailing-list id -> subscribed boolean.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

10 tool updatesOct 9, 2026

Changedloops_create_contact3 fields changed

changedInput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

removedInput schema / properties / properties / additionalProperties / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "number"
-  },
-  {
-    "type": "boolean"
-  }
-]

addedInput schema / properties / properties / additionalProperties / type
```
Added value: +[
+  "string",
+  "number",
+  "boolean"
+]
```

Changedloops_create_contact_property1 field changed

changedInput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

Changedloops_delete_contact1 field changed

changedInput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

Changedloops_find_contact1 field changed

changedInput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

Changedloops_list_contact_properties1 field changed

changedInput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

Changedloops_list_mailing_lists1 field changed

changedInput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

Changedloops_send_event5 fields changed

changedInput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

removedInput schema / properties / contactProperties / additionalProperties / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "number"
-  },
-  {
-    "type": "boolean"
-  }
-]

addedInput schema / properties / contactProperties / additionalProperties / type
```
Added value: +[
+  "string",
+  "number",
+  "boolean"
+]
```

removedInput schema / properties / eventProperties / additionalProperties / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "number"
-  },
-  {
-    "type": "boolean"
-  }
-]

addedInput schema / properties / eventProperties / additionalProperties / type
```
Added value: +[
+  "string",
+  "number",
+  "boolean"
+]
```

Changedloops_send_transactional3 fields changed

changedInput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

removedInput schema / properties / dataVariables / additionalProperties / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "number"
-  }
-]

addedInput schema / properties / dataVariables / additionalProperties / type
```
Added value: +[
+  "string",
+  "number"
+]
```

Changedloops_test_api_key1 field changed

changedInput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

Changedloops_update_contact3 fields changed

changedInput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

removedInput schema / properties / properties / additionalProperties / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "number"
-  },
-  {
-    "type": "boolean"
-  }
-]

addedInput schema / properties / properties / additionalProperties / type
```
Added value: +[
+  "string",
+  "number",
+  "boolean"
+]
```

10 tool updatesJul 18, 2026
- First observedloops_create_contact
- First observedloops_create_contact_property
- First observedloops_delete_contact
- First observedloops_find_contact
- First observedloops_list_contact_properties
- First observedloops_list_mailing_lists
- First observedloops_send_event
- First observedloops_send_transactional
- First observedloops_test_api_key
- First observedloops_update_contact

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Server Details

TDQS

Available Tools

Tool Schema Changelog

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