set_activity_description

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

Annotations already declare readOnlyHint=false, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description does add genuinely useful behavior beyond them: it discloses the return value (null on success) and the verification path via getActivity, which no structured field supplies. It still omits what is actually mutated and whether the write is idempotent.

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?

It is short and front-loads its only content, but that content is about the return value rather than the purpose. Nothing is padded, but the space is allocated to the wrong concern for a definition this terse.

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?

With no output schema, the description reasonably covers return behavior, but for a two-parameter mutation it omits what gets written, size/format constraints on `description`, and how to confirm the change. An agent knows the callback result but not what the call changes.

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 only 50%, and the `description` parameter has no schema description at all. The tool description adds nothing about either parameter, so the undocumented half is left completely unexplained. It does not compensate for the coverage gap.

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 never states what the tool does: it only says it 'resolves to `null` on success' and that the description was read back via getActivity. An agent must infer the verb+resource entirely from the name, and there is no differentiation from sibling setters like set_activity_name or set_activity_feel.

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?

No when-to-use guidance, no prerequisites, and no mention of the many sibling set_activity_* tools. The only implicit cue is 'description', which the name already carries.

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