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

With no annotations provided, the description carries the full burden. It transparently states that the tool returns a stack and describes the return fields ('stack name, description, skills with slugs, install commands'). It stops short of explicitly stating that no installation occurs, but the verb 'Return' makes this apparent. The description provides useful behavioral context beyond the schema.

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 front-loaded with the primary purpose, then provides brief elaboration and the list of available stacks. Every sentence earns its place, and there is no fluff or redundancy. The structure is exceptionally clear and easy to parse.

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 tool with one optional parameter, no output schema, and no annotations, the description is highly complete. It explains what the tool does, describes the return shape, lists all available stacks, and covers the key use case. The absence of output schema is mitigated by the explicit return fields. This is complete enough for an agent to invoke correctly.

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?

Schema coverage is 100% for the single 'name' parameter, including the list of available stacks and the default value. The description redundantly lists the stacks and adds context that each stack groups 5-15 skills, but it does not add new parameter-level meaning beyond what the schema already provides. Baseline 3 applies.

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 clearly states the tool's function: 'Return a curated skill stack (bundle) for bulk pre-installation.' The verb 'Return' and resource 'skill stack' are specific, and listing available stacks adds scope. This distinguishes it from sibling tools like get_skill or search_skills by focusing on multi-skill bundles.

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?

The description clearly conveys the use case: 'for bulk pre-installation' with each stack grouping 5-15 skills for a common use case. It does not explicitly mention when not to use it or name alternative tools, but the context is clear enough for an agent to select this when a predefined bundle is needed.

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