get_schema_by_subject

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

The annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, covering the safety profile. The description adds no additional behavioral context beyond the action itself, such as what is returned, whether the subject must exist, or how it differs from listing versions. With no extra disclosure, the description contributes minimally to behavioral transparency.

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 short sentence, 'Get a schema by subject,' which is concise and front-loaded. There is no redundant phrasing or filler; every word earns 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?

Given the absence of an output schema and the presence of closely related sibling tools (get_schema_versions, get_schema_version), the description is too terse to fully inform an agent about return semantics or usage boundaries. It does not explain whether the tool returns the latest schema, all versions, or just metadata, which is needed for correct invocation in this context.

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%: both 'cluster' and 'subject' have meaningful descriptions in the input schema. The tool description itself does not add any further parameter details, so the baseline of 3 applies because the schema handles the documentation 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 'Get a schema by subject' uses a specific verb and resource, clearly indicating the action and the key qualifier. However, it does not explicitly differentiate itself from sibling tools like get_schema_versions or get_schema_version, leaving some ambiguity about whether it returns a list, a latest version, or a specific schema definition.

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 gives no guidance on when to use this tool versus its siblings. It does not mention alternatives such as get_schema_versions or get_schema_version, nor does it specify conditions like 'use this to fetch the latest schema for a subject'.

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