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eduardobrito21

fastmail-mcp

create_sieve_script

Create a new Sieve filter script to automatically sort and process incoming emails. Activate it immediately if desired.

Instructions

Create a new Sieve filter script.

Args: name: Script name. content: Sieve script source. is_active: Activate this script immediately (only one script can be active).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nameYes
contentYes
is_activeNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior2/5

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

With no annotations provided, the description should disclose behavioral traits such as what happens on name conflict, syntax validation, or permissions. It only mentions the activation constraint, leaving other behaviors undisclosed.

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 sentence plus a structured Args block, front-loaded with the main purpose. Every line adds value, and there is no unnecessary text.

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

Completeness3/5

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

The description covers the basic operation but lacks details on constraints like name uniqueness, content format, or expected output. However, the presence of an output schema reduces the need to describe return values.

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?

Given 0% schema description coverage, the description fully explains each parameter: name, content, and is_active with the activation note. This adds essential meaning beyond the schema type definitions.

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 'Create' and the resource 'new Sieve filter script', which is distinct from sibling tools like update_sieve_script, destroy_sieve_script, and validate_sieve_script.

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?

The description does not explicitly state when to use this tool versus alternatives like validate_sieve_script, but the is_active parameter note 'only one script can be active' provides some usage context.

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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