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

Annotations only provide openWorldHint=true, so the description carries most of the burden. It adds one genuinely useful behavioral fact — every action requires authentication — but says nothing about the mutation semantics of update-password (e.g. whether it invalidates sessions) or whether changes are reversible. It also mixes read actions (get) with destructive ones (update-password) with no distinction, which is a meaningful gap.

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?

Front-loaded with the core purpose, then a compact action enumeration and a single authentication note; no filler. Slightly terse given the tool's action multiplicity, but every sentence earns its place.

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 15-parameter, five-action multi-tool with only openWorldHint in annotations and no output schema, the description is adequate but thin: it names the actions without describing what any of them return or what side effects they carry. Since the input schema covers all parameters, the main incompleteness is on the behavioral/return side.

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 every parameter is already documented with its action affinity in the schema. The description's action list mildly reinforces which parameter groups belong to which action but adds no syntax, format, or constraint detail beyond the schema, so the baseline 3 applies.

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 resource ('Manage the authenticated user's profile') and enumerates the five actions with brief glosses, so an agent knows exactly what the tool does. It does not explicitly distinguish itself from siblings like agent-auth or agent-teams, but 'profile' is semantically distinct enough to be picked out of the list.

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 action glosses ('get (view profile)', 'update (update name/username/about)') give implied when-to-use for each action, and 'All actions require authentication' sets a precondition. There is no guidance on when to reach for this tool versus agent-auth or other siblings, and no exclusions.

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