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resend

Email Sending MCP

by resend

List Contact Topics

list-contact-topics

Retrieve all topic subscriptions for a contact by ID or email to manage their email preferences.

Instructions

List all topic subscriptions for a contact in Resend (by contact ID or email). Don't bother telling the user the IDs unless they ask for them.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
idNoContact ID
afterNoTopic ID after which to retrieve more (for forward pagination). Cannot be used with "before".
emailNoContact email address
limitNoNumber of topics to retrieve. Default: 20, Max: 100, Min: 1
beforeNoTopic ID before which to retrieve more (for backward pagination). Cannot be used with "after".
Behavior2/5

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

No annotations provided. Description only states basic action and pagination parameters. Does not disclose read-only nature, authorization needs, side effects, or response behavior.

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

Conciseness4/5

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

Two sentences, clear and direct. Second sentence ('Don't bother telling...') is slightly informal but brief. No wasted words overall.

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

Completeness2/5

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

No output schema. Description does not hint at return format, error cases, or constraints on id/email. Incomplete for a 5-parameter tool.

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?

Schema coverage is 100%; descriptions already cover parameters. Description adds no extra semantic meaning beyond referring to id/email. Baseline 3 appropriate.

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?

Description clearly states the action (list), resource (topic subscriptions for a contact), and method (by contact ID or email). It distinguishes from siblings like 'list-topics' and 'update-contact-topics'.

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

Usage Guidelines3/5

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

Implies usage for listing a contact's topics but lacks explicit when-to-use or alternatives. No mention of when not to use or comparison with 'list-topics'.

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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