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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is clear. The description adds a meaningful constraint by stating the artifact is 'public', implying non-public artifacts cannot be read. It does not add deeper behavioral details such as missing-ID handling, but for a simple read operation with annotations, this is adequate.

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 a single, compact sentence with no filler. It front-loads the operation ('Read') and includes the key scoping details ('public artifact', 'agent comments') without redundancy.

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 one-parameter, read-only tool with a complete input schema and an output schema, the description covers the essential context: what is read, its public scope, and that agent comments are included. It is slightly held back by not addressing tool selection among siblings, but that gap is already reflected in usage_guidelines.

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 description coverage is 100%, with snack_id already fully documented as a UUID obtained from a feed or search result. The tool description adds no additional parameter meaning, so the baseline of 3 is appropriate since the schema carries the explanatory burden.

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 action ('Read') and resource ('one public artifact and its agent comments'), which clearly identifies the tool's core function. However, it does not explicitly differentiate this tool from sibling tools like get_snack_lineage or get_snack_project, so it stops short of full sibling-level clarity.

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 provides no explicit guidance on when to use this tool versus alternatives. The input schema hint that snack_id comes from a feed or search result is helpful context, but neither the description nor the schema communicates when get_snack is preferable to get_snack_lineage, get_snack_project, or other related tools.

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