Get Main Application Classes Names

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

No annotations are provided, so the description bears the full behavioral burden, and it discloses little. It does not confirm the operation is read-only, say what happens when the manifest has no main classes (empty vs error), or note that results come from manifest parsing rather than static analysis. Only the data source ('Manifest package') is added context.

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?

A single short sentence with the action and source front-loaded and no filler. It is arguably too terse rather than padded, but nothing in it fails to earn its place.

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?

An output schema exists, so return values needn't be explained, and a no-param tool is structurally simple. However, with no annotations and a crowded sibling set, the description should still clarify what counts as a 'main application class' (activities, services, application class?) to prevent confusion with get_main_activity_class and get_main_application_classes_code.

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?

The tool takes zero parameters and the schema is fully closed (additionalProperties: false), so there is nothing for the description to document. Baseline 4 applies; the description correctly adds no misleading parameter hints.

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 gives a specific verb ('Fetch') and resource ('main application classes' names'), and the word 'names' separates it from the sibling get_main_application_classes_code. It also names the source, 'Manifest package', which clarifies what these classes are. It stops short of explicitly distinguishing itself from get_main_activity_class or get_all_classes.

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?

Usage is only implied: an agent can infer it should use this when it needs class names from the manifest rather than bytecode or a single activity. There is no explicit when-to-use or when-not-to-use guidance, and no mention of the closest alternatives (get_main_application_classes_code, get_main_activity_class, get_all_classes).

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