set_settings

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

With no annotations, the description carries the burden alone; it does disclose that the call is additive ('and/or') and what the timezone affects, which is real behavioral context. However it never says whether omitted fields are left unchanged or reset to schema defaults (0 and ""), which is the key risk for a settings mutation, and it states a default of 20 XP while the schema declares default 0.

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 short sentences, front-loaded with the primary action, no filler. It could add the partial-update rule without losing brevity, so it is slightly under-specified rather than padded.

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?

An output schema exists and annotations are absent, so the description reasonably focuses on inputs and side effects; it gives the streak rationale for timezone, which an agent needs. Gaps remain around user_id and round-trip semantics for fields left unset, given the suspicious 0/"" schema defaults.

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 0%, so the description must compensate: it explains daily_goal_xp (with a default) and timezone_name (with a valid format example), covering two of three parameters meaningfully. The user_id parameter is entirely unexplained, and the stated XP default conflicts with the schema's default of 0.

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 and the two concrete resources it mutates (daily XP goal, IANA timezone), with examples. It does not distinguish itself from the very similar sibling set_preferences, leaving the boundary between the two settings tools to inference.

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?

There is no explicit when-to-use guidance and no mention of set_preferences or get_preferences as the counterpart tools. The sentence about timezone affecting 'today' explains the effect of a field, not when to call this tool versus its closest sibling.

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