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eduardobrito21

fastmail-mcp

update_sieve_script

Update an existing Sieve script by changing its name, content, or active state.

Instructions

Update an existing Sieve script (name, content, or active state).

Args: script_id: ID of the Sieve script to update. name: New name (empty to leave unchanged). content: New Sieve source (empty to leave unchanged). is_active: Set active state (null to leave unchanged).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
script_idYes
nameNo
contentNo
is_activeNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior2/5

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

No annotations are provided, so the description carries full burden. While it indicates a mutation (update), it fails to disclose side effects, such as whether changes take effect immediately, if validation occurs, or permission requirements. The behavioral impact beyond the action is under-specified.

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?

The description is concise, with a clear purpose upfront and a structured 'Args' section. However, the format repeats parameter names unnecessarily and could be more streamlined.

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?

Given the 4 parameters with no schema descriptions and no annotations, the description adequately explains all inputs. However, it lacks usage guidelines and behavioral transparency, so while operationally complete for invocation, it is incomplete for contextual decision-making.

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 description coverage, the description adds meaning to all four parameters. It clarifies that 'name' and 'content' can be left unchanged by sending empty strings, and 'is_active' can be left unchanged by sending null. This adds critical semantics beyond the schema's type-only information.

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 'Update' and the resource 'Sieve script', and lists the updatable fields (name, content, or active state). The sibling tools include create, destroy, get, list, and validate scripts, making this tool's purpose distinct.

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?

The description does not provide any guidance on when to use this tool versus its siblings. It lacks explicit context for when to update versus create or delete scripts, and does not mention prerequisites or conditions for update.

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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