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helbertparanhos

resend-email-mcp

list_broadcasts

Read-onlyIdempotent

Retrieve a paginated list of email broadcasts. Specify limit and cursor to navigate through results.

Instructions

List all broadcasts (paginated).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
limitNoMax items to return (1-100)
afterNoPagination cursor: return items after this ID
beforeNoPagination cursor: return items before this ID
Behavior3/5

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

Annotations already declare readOnlyHint, destructiveHint, idempotentHint, and openWorldHint. The description adds 'paginated,' which is also evident from the input schema parameters, so little extra behavioral context is provided.

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?

The description is a single, concise sentence that effectively communicates the core purpose without unnecessary words or structure.

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?

For a simple paginated list tool with full parameter descriptions and safety annotations, the description is mostly complete. However, it could note the openWorldHint implication that 'all broadcasts' may not be exhaustive, and it omits any mention of default ordering or filtering.

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?

The input schema has 100% parameter description coverage, so the description does not need to add meaning. The baseline score of 3 is appropriate as the description adds no extra parameter semantics.

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 the verb 'List' and the resource 'broadcasts,' with the pagination hint distinguishing it from single-resource tools like get_broadcast and mutation tools like create_broadcast.

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

Usage Guidelines2/5

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

No guidance is provided on when to use this tool versus alternatives (e.g., get_broadcast for a single item or list_segments for other resources). The description lacks any contextual advice for the agent.

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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