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damientilman

Mailchimp MCP

update_batch_webhook

Update the callback URL of an existing Mailchimp batch webhook. Point it to a new endpoint to receive POST notifications when a batch completes.

Instructions

Update the target URL of an existing batch webhook.

Use to point an existing batch webhook at a new callback URL. Use list_batch_webhooks to find batch_webhook_id values and delete_batch_webhook to remove a webhook instead.

Returns 404 error if batch_webhook_id is invalid.

Args: batch_webhook_id: The batch webhook ID to update. Obtain from list_batch_webhooks. url: The new callback URL Mailchimp will POST to when a batch completes.

Returns: JSON with id, url, enabled (boolean). Returns an error object if the input is rejected.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
urlYes
accountNo
batch_webhook_idYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior3/5

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

Adds error behavior (404, error object on rejection) but lacks idempotency, permission, or side effect details. Annotations only provide readOnlyHint, destructiveHint, idempotentHint (all false), leaving description to carry more burden.

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?

Concise with clear sections: purpose, usage guidance, error note, args, returns. No unnecessary words.

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

Completeness4/5

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

Covers purpose, usage, error handling, and two of three parameters. Missing explanation of optional 'account' parameter, but overall sufficient for a simple update tool with existing output schema and sibling context.

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

Parameters3/5

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

Explains batch_webhook_id (source from list) and url (new callback URL), but omits the optional 'account' parameter. With 0% schema coverage, the description partially compensates but misses one parameter.

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?

The description clearly states it updates the target URL of an existing batch webhook, uses a specific verb ('Update'), and distinguishes from sibling tools (list_batch_webhooks, delete_batch_webhook).

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 tells when to use (point webhook at new URL), directs to list_batch_webhooks to find IDs, and suggests delete_batch_webhook as an alternative for removal.

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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