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damientilman

Mailchimp MCP

update_member

Idempotent

Update a member's profile fields or subscription status in a Mailchimp audience. Only specified fields are changed; changing status to pending sends a re-confirmation email.

Instructions

Update a member's profile fields or subscription status. Does not manage tags.

Only provided fields are updated; omitted fields remain unchanged. Idempotent: re-applying the same values is safe. Side effect: changing status to 'pending' triggers a re-confirmation email. Choose the right member tool: update_member for profile/status changes, tag_member for tag management, unsubscribe_member as shortcut for opt-out, add_member if the contact does not exist yet, batch_subscribe for bulk operations.

Returns 404 error if member does not exist. Returns 400 if status transition is invalid (e.g. cleaned to subscribed).

Args: list_id: Audience/list ID (10-char alphanumeric, e.g. 'abc123def4'). Obtain from list_audiences. email_address: Email of the member to update. Must exist in the audience. status: New status: 'subscribed', 'unsubscribed', 'cleaned', 'pending'. first_name: New first name (FNAME merge field). last_name: New last name (LNAME merge field).

Returns: JSON with id, email_address, status, full_name.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
statusNo
accountNo
list_idYes
last_nameNo
first_nameNo
email_addressYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Discloses idempotency (matching annotation), side effect of re-confirmation email on status change to 'pending', and error conditions (404, 400). Adds context beyond annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Well-structured with clear sections, no unnecessary words, and every sentence adds value. Front-loaded with purpose and usage.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Covers purpose, usage guidelines, parameter details, side effects, error responses, and return values. Complete given tool complexity and presence of output schema.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters5/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With 0% schema coverage, description fully explains all parameters: list_id format and source, email_address requirement, status options, and merge fields (first_name, last_name). Also describes return fields.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Clearly states the tool updates member profile fields or subscription status, and distinguishes from sibling tools like tag_member and add_member.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly provides when to use this tool versus alternatives (tag_member, unsubscribe_member, add_member, batch_subscribe), and states it does not manage tags.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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