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

The annotations already declare this to be a safe, idempotent, read-only, closed-world operation. The description adds useful behavioral context by stating that it returns the current accounting period, preparation status, and next steps. It does not mention permissions, rate limits, or failure behavior, but those are less critical for a simple read-only status tool.

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

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

The description is two sentences, front-loaded with the core action and followed immediately by return contents and usage triggers. Every sentence adds useful information with no repetition or filler.

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

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

For a simple read-only tool with one fully documented optional parameter and no output schema, the description provides enough context to call it correctly. It explains the returned information and when to use it. Minor gaps remain around sibling differentiation and explicit exclusions.

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

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

There is one optional parameter, and its schema description fully explains how to use it, including the default behavior when omitted. The tool description adds no parameter-specific meaning beyond the schema, so the baseline score of 3 is appropriate given 100% schema coverage.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a specific verb and resource: getting the status of annual accounts preparation for the current company. It also lists what is returned, making the tool's purpose clear. It does not explicitly differentiate this from nearby siblings such as get_filed_accounts_history or get_deadlines.

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

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

It gives clear usage context by naming several triggers: annual accounts, Companies House filing, year-end accounts, and corporation tax deadline. It does not explicitly state when not to use it or name alternative tools for overlapping questions.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.