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

Annotations already declare readOnly, idempotent, and non-destructive behavior, so the bar is lower. The description adds valuable non-obvious edge-case behavior: an unknown tag returns the topics that do exist, so a miss still yields useful output. It also clarifies that an empty answer means the topic does not exist, which complements the read-only trust profile.

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?

Two sentences with no wasted words: action and scope first, then routing guidance, then the unknown-tag fallback behavior. Every sentence 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?

For a single-parameter, read-only tool with a rich parameter description, safety annotations, and an output schema, the description fully covers purpose, when-to-use, and edge-case behavior. Nothing an agent needs to select and invoke this tool correctly is missing.

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%, and the tag parameter's schema description already explains exact spelling requirements and the empty-answer meaning. The tool description adds usage context ('browse a known topic') but no additional parameter-format details, so the 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?

States a specific verb ('List') and resource ('knowledge objects') filtered by a tag, with the clarifying note that topics are content-backed tags. Explicitly distinguishes this tool from search and get_overview, so an agent can identify it correctly without opening schemas.

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?

Provides explicit guidance: use this to browse a known topic, use search for question-based queries, and use get_overview to enumerate existing tags. This fully routes the agent among the sibling tools.

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