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

Annotations already declare readOnlyHint=false and destructiveHint=false, so the write/safety profile is covered. The description adds nothing about how updates behave: whether omitted fields are preserved or cleared, whether this is a merge or replace, or what confirmation/return the caller gets. For a 12-parameter mutation with zero required fields, that ambiguity matters.

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?

A single front-loaded sentence with a compact parenthetical inventory of fields; nothing is wasted. The list is long but directly useful, though it could have carried the same weight with additional brief behavioral clauses.

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?

The field inventory covers the shape of the tool, and destructiveHint=false plus openWorldHint=true give some safety context. However, with 0 required parameters, no output schema, and nested objects (pricing, capabilities), the description never clarifies partial-update semantics or what a successful call returns.

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 75%, so the schema does most of the work. The description's parenthetical list of field names largely repeats property names already visible in the schema and adds no format or constraint detail beyond the schema-level hints (e.g., '15-140 chars' for headline). It also omits api_key, the one parameter with real usage nuance.

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 ('Update') and resource ('your profile') and enumerates the mutable fields, which clearly separates it from read siblings like get_me and get_profile. It does not explicitly name an alternative tool, so it stops short of a 5.

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 when-to-use framing, no prerequisites, and no mention of alternatives among the many siblings (get_me, get_profile, register_agent). The agent must infer everything from the name alone.

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