create_subtopic

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

Annotations already establish that this is a write operation (readOnlyHint=false) and not idempotent or destructive. The description adds only the hierarchical relationship ('under a topic') and does not discuss failure behavior, uniqueness, whether the parent must exist, or what happens on success. It does not contradict the annotations.

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, front-loaded sentence with no filler. It conveys the core operation and hierarchy relationship in minimal words while remaining unambiguous.

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 simple 3-parameter creation tool with full schema coverage and annotations, the description is minimally viable. However, it omits helpful context such as the need for the parent topic to exist, any return behavior, and how duplicates are handled. This is not critical for invocation but leaves several edge-case questions unanswered.

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%, so parameters are fully documented in the schema. The description adds no parameter-specific detail, which is acceptable because the schema already explains topic_id, name, and description sufficiently.

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 verb ('Add') and a specific resource ('a subtopic under a topic'), immediately establishing that this creates a child of a parent topic. This clearly differentiates it from sibling create_topic while remaining easy to understand.

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 phrase 'under a topic' implies this should be used only when there is an existing parent topic, but the description gives no explicit when-to-use guidance or mention of alternatives like create_topic for top-level topics. The usage context is inferable, not stated.

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