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

Well beyond the annotations: it discloses that the write goes through the profile editor's own save, that the section is read back and compared field by field before being reported, that an unknown field yields 400 UNKNOWN_FIELD with nothing changed, that profile:write permission is required, and that unauthenticated members are prompted to sign in. The annotations (non-destructive, non-idempotent, closed-world) are consistent with this.

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 mutation contract and refusals are front-loaded, which is right, but the text is cramped and multiplies clauses in a single sentence ('Changes the answers named (true or false), exactly as the profile editor saves them') and the parenthetical '(compared field by field before it is reported)'. The trailing prompt-injection boilerplate about member-written text is generic and adds bulk relative to this tool's job.

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 ten-parameter mutation with no output schema, the description covers authorization, authentication fallback, partial-update rules, refusal behavior, and post-write verification. It never says what the read-back is returned as, which is the one remaining gap an agent would care about.

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 100%, so every boolean and its meaning is already documented, making the baseline 3 correct. The description does add partial-update semantics — only named fields change and nulls are refused — which the schema alone does not settle, but it adds no per-field nuance beyond the schema.

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 verb-and-resource pair 'Correct your member's Work preferences' is specific, and the description concretizes it with the example '"I can travel and work Saturdays": Changes the answers named (true or false)'. It implies the read/write split with the sibling get_my_work_preferences without naming it, so differentiation is good but not spelled out.

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?

Gives actionable usage rules: 'Name only the fields to change; null or an empty value is refused' and the refusal of a body naming another member, a street address, or a file. It does not explicitly route the agent to get_my_work_preferences for reading or to update_my_profile for other sections, so the alternatives half of the guidance is missing.

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